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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0
 #include <errno.h>
 #include <inttypes.h>
 #include "string2.h"
 #include <sys/param.h>
 #include <sys/types.h>
 #include <byteswap.h>
 #include <unistd.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <linux/compiler.h>
 #include <linux/list.h>
 #include <linux/kernel.h>
 #include <linux/bitops.h>
 #include <linux/string.h>
 #include <linux/stringify.h>
 #include <linux/zalloc.h>
 #include <sys/stat.h>
 #include <sys/utsname.h>
 #include <linux/time64.h>
 #include <dirent.h>
 #ifdef HAVE_LIBBPF_SUPPORT
 #include <bpf/libbpf.h>
 #endif
 #include <perf/cpumap.h>
 
 #include "dso.h"
 #include "evlist.h"
 #include "evsel.h"
 #include "util/evsel_fprintf.h"
 #include "header.h"
 #include "memswap.h"
 #include "trace-event.h"
 #include "session.h"
 #include "symbol.h"
 #include "debug.h"
 #include "cpumap.h"
 #include "pmu.h"
 #include "vdso.h"
 #include "strbuf.h"
 #include "build-id.h"
 #include "data.h"
 #include <api/fs/fs.h>
 #include "asm/bug.h"
 #include "tool.h"
 #include "time-utils.h"
 #include "units.h"
 #include "util/util.h" // perf_exe()
 #include "cputopo.h"
 #include "bpf-event.h"
 #include "bpf-utils.h"
 #include "clockid.h"
 #include "pmu-hybrid.h"
 
 #include <linux/ctype.h>
 #include <internal/lib.h>
 
 /*
  * magic2 = "PERFILE2"
  * must be a numerical value to let the endianness
  * determine the memory layout. That way we are able
  * to detect endianness when reading the perf.data file
  * back.
  *
  * we check for legacy (PERFFILE) format.
  */
 static const char *__perf_magic1 = "PERFFILE";
 static const u64 __perf_magic2    = 0x32454c4946524550ULL;
 static const u64 __perf_magic2_sw = 0x50455246494c4532ULL;
 
 #define PERF_MAGIC  __perf_magic2
 
 const char perf_version_string[] = PERF_VERSION;
 
 struct perf_file_attr {
     struct perf_event_attr  attr;
     struct perf_file_section    ids;
 };
 
 void perf_header__set_feat(struct perf_header *header, int feat)
 {
     set_bit(feat, header->adds_features);
 }
 
 void perf_header__clear_feat(struct perf_header *header, int feat)
 {
     clear_bit(feat, header->adds_features);
 }
 
 bool perf_header__has_feat(const struct perf_header *header, int feat)
 {
     return test_bit(feat, header->adds_features);
 }
 
 static int __do_write_fd(struct feat_fd *ff, const void *buf, size_t size)
 {
     ssize_t ret = writen(ff->fd, buf, size);
 
     if (ret != (ssize_t)size)
         return ret < 0 ? (int)ret : -1;
     return 0;
 }
 
 static int __do_write_buf(struct feat_fd *ff,  const void *buf, size_t size)
 {
     /* struct perf_event_header::size is u16 */
     const size_t max_size = 0xffff - sizeof(struct perf_event_header);
     size_t new_size = ff->size;
     void *addr;
 
     if (size + ff->offset > max_size)
         return -E2BIG;
 
     while (size > (new_size - ff->offset))
         new_size <<= 1;
     new_size = min(max_size, new_size);
 
     if (ff->size < new_size) {
         addr = realloc(ff->buf, new_size);
         if (!addr)
             return -ENOMEM;
         ff->buf = addr;
         ff->size = new_size;
     }
 
     memcpy(ff->buf + ff->offset, buf, size);
     ff->offset += size;
 
     return 0;
 }
 
 /* Return: 0 if succeeded, -ERR if failed. */
 int do_write(struct feat_fd *ff, const void *buf, size_t size)
 {
     if (!ff->buf)
         return __do_write_fd(ff, buf, size);
     return __do_write_buf(ff, buf, size);
 }
 
 /* Return: 0 if succeeded, -ERR if failed. */
 static int do_write_bitmap(struct feat_fd *ff, unsigned long *set, u64 size)
 {
     u64 *p = (u64 *) set;
     int i, ret;
 
     ret = do_write(ff, &size, sizeof(size));
     if (ret < 0)
         return ret;
 
     for (i = 0; (u64) i < BITS_TO_U64(size); i++) {
         ret = do_write(ff, p + i, sizeof(*p));
         if (ret < 0)
             return ret;
     }
 
     return 0;
 }
 
 /* Return: 0 if succeeded, -ERR if failed. */
 int write_padded(struct feat_fd *ff, const void *bf,
          size_t count, size_t count_aligned)
 {
     static const char zero_buf[NAME_ALIGN];
     int err = do_write(ff, bf, count);
 
     if (!err)
         err = do_write(ff, zero_buf, count_aligned - count);
 
     return err;
 }
 
 #define string_size(str)                        \
     (PERF_ALIGN((strlen(str) + 1), NAME_ALIGN) + sizeof(u32))
 
 /* Return: 0 if succeeded, -ERR if failed. */
 static int do_write_string(struct feat_fd *ff, const char *str)
 {
     u32 len, olen;
     int ret;
 
     olen = strlen(str) + 1;
     len = PERF_ALIGN(olen, NAME_ALIGN);
 
     /* write len, incl. \0 */
     ret = do_write(ff, &len, sizeof(len));
     if (ret < 0)
         return ret;
 
     return write_padded(ff, str, olen, len);
 }
 
 static int __do_read_fd(struct feat_fd *ff, void *addr, ssize_t size)
 {
     ssize_t ret = readn(ff->fd, addr, size);
 
     if (ret != size)
         return ret < 0 ? (int)ret : -1;
     return 0;
 }
 
 static int __do_read_buf(struct feat_fd *ff, void *addr, ssize_t size)
 {
     if (size > (ssize_t)ff->size - ff->offset)
         return -1;
 
     memcpy(addr, ff->buf + ff->offset, size);
     ff->offset += size;
 
     return 0;
 
 }
 
 static int __do_read(struct feat_fd *ff, void *addr, ssize_t size)
 {
     if (!ff->buf)
         return __do_read_fd(ff, addr, size);
     return __do_read_buf(ff, addr, size);
 }
 
 static int do_read_u32(struct feat_fd *ff, u32 *addr)
 {
     int ret;
 
     ret = __do_read(ff, addr, sizeof(*addr));
     if (ret)
         return ret;
 
     if (ff->ph->needs_swap)
         *addr = bswap_32(*addr);
     return 0;
 }
 
 static int do_read_u64(struct feat_fd *ff, u64 *addr)
 {
     int ret;
 
     ret = __do_read(ff, addr, sizeof(*addr));
     if (ret)
         return ret;
 
     if (ff->ph->needs_swap)
         *addr = bswap_64(*addr);
     return 0;
 }
 
 static char *do_read_string(struct feat_fd *ff)
 {
     u32 len;
     char *buf;
 
     if (do_read_u32(ff, &len))
         return NULL;
 
     buf = malloc(len);
     if (!buf)
         return NULL;
 
     if (!__do_read(ff, buf, len)) {
         /*
          * strings are padded by zeroes
          * thus the actual strlen of buf
          * may be less than len
          */
         return buf;
     }
 
     free(buf);
     return NULL;
 }
 
 /* Return: 0 if succeeded, -ERR if failed. */
 static int do_read_bitmap(struct feat_fd *ff, unsigned long **pset, u64 *psize)
 {
     unsigned long *set;
     u64 size, *p;
     int i, ret;
 
     ret = do_read_u64(ff, &size);
     if (ret)
         return ret;
 
     set = bitmap_zalloc(size);
     if (!set)
         return -ENOMEM;
 
     p = (u64 *) set;
 
     for (i = 0; (u64) i < BITS_TO_U64(size); i++) {
         ret = do_read_u64(ff, p + i);
         if (ret < 0) {
             free(set);
             return ret;
         }
     }
 
     *pset  = set;
     *psize = size;
     return 0;
 }
 
 static int write_tracing_data(struct feat_fd *ff,
                   struct evlist *evlist)
 {
     if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))
         return -1;
 
     return read_tracing_data(ff->fd, &evlist->core.entries);
 }
 
 static int write_build_id(struct feat_fd *ff,
               struct evlist *evlist __maybe_unused)
 {
     struct perf_session *session;
     int err;
 
     session = container_of(ff->ph, struct perf_session, header);
 
     if (!perf_session__read_build_ids(session, true))
         return -1;
 
     if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))
         return -1;
 
     err = perf_session__write_buildid_table(session, ff);
     if (err < 0) {
         pr_debug("failed to write buildid table\n");
         return err;
     }
     perf_session__cache_build_ids(session);
 
     return 0;
 }
 
 static int write_hostname(struct feat_fd *ff,
               struct evlist *evlist __maybe_unused)
 {
     struct utsname uts;
     int ret;
 
     ret = uname(&uts);
     if (ret < 0)
         return -1;
 
     return do_write_string(ff, uts.nodename);
 }
 
 static int write_osrelease(struct feat_fd *ff,
                struct evlist *evlist __maybe_unused)
 {
     struct utsname uts;
     int ret;
 
     ret = uname(&uts);
     if (ret < 0)
         return -1;
 
     return do_write_string(ff, uts.release);
 }
 
 static int write_arch(struct feat_fd *ff,
               struct evlist *evlist __maybe_unused)
 {
     struct utsname uts;
     int ret;
 
     ret = uname(&uts);
     if (ret < 0)
         return -1;
 
     return do_write_string(ff, uts.machine);
 }
 
 static int write_version(struct feat_fd *ff,
              struct evlist *evlist __maybe_unused)
 {
     return do_write_string(ff, perf_version_string);
 }
 
 static int __write_cpudesc(struct feat_fd *ff, const char *cpuinfo_proc)
 {
     FILE *file;
     char *buf = NULL;
     char *s, *p;
     const char *search = cpuinfo_proc;
     size_t len = 0;
     int ret = -1;
 
     if (!search)
         return -1;
 
     file = fopen("/proc/cpuinfo", "r");
     if (!file)
         return -1;
 
     while (getline(&buf, &len, file) > 0) {
         ret = strncmp(buf, search, strlen(search));
         if (!ret)
             break;
     }
 
     if (ret) {
         ret = -1;
         goto done;
     }
 
     s = buf;
 
     p = strchr(buf, ':');
     if (p && *(p+1) == ' ' && *(p+2))
         s = p + 2;
     p = strchr(s, '\n');
     if (p)
         *p = '\0';
 
     /* squash extra space characters (branding string) */
     p = s;
     while (*p) {
         if (isspace(*p)) {
             char *r = p + 1;
             char *q = skip_spaces(r);
             *p = ' ';
             if (q != (p+1))
                 while ((*r++ = *q++));
         }
         p++;
     }
     ret = do_write_string(ff, s);
 done:
     free(buf);
     fclose(file);
     return ret;
 }
 
 static int write_cpudesc(struct feat_fd *ff,
                struct evlist *evlist __maybe_unused)
 {
 #if defined(__powerpc__) || defined(__hppa__) || defined(__sparc__)
 #define CPUINFO_PROC    { "cpu", }
 #elif defined(__s390__)
 #define CPUINFO_PROC    { "vendor_id", }
 #elif defined(__sh__)
 #define CPUINFO_PROC    { "cpu type", }
 #elif defined(__alpha__) || defined(__mips__)
 #define CPUINFO_PROC    { "cpu model", }
 #elif defined(__arm__)
 #define CPUINFO_PROC    { "model name", "Processor", }
 #elif defined(__arc__)
 #define CPUINFO_PROC    { "Processor", }
 #elif defined(__xtensa__)
 #define CPUINFO_PROC    { "core ID", }
 #else
 #define CPUINFO_PROC    { "model name", }
 #endif
     const char *cpuinfo_procs[] = CPUINFO_PROC;
 #undef CPUINFO_PROC
     unsigned int i;
 
     for (i = 0; i < ARRAY_SIZE(cpuinfo_procs); i++) {
         int ret;
         ret = __write_cpudesc(ff, cpuinfo_procs[i]);
         if (ret >= 0)
             return ret;
     }
     return -1;
 }
 
 
 static int write_nrcpus(struct feat_fd *ff,
             struct evlist *evlist __maybe_unused)
 {
     long nr;
     u32 nrc, nra;
     int ret;
 
     nrc = cpu__max_present_cpu().cpu;
 
     nr = sysconf(_SC_NPROCESSORS_ONLN);
     if (nr < 0)
         return -1;
 
     nra = (u32)(nr & UINT_MAX);
 
     ret = do_write(ff, &nrc, sizeof(nrc));
     if (ret < 0)
         return ret;
 
     return do_write(ff, &nra, sizeof(nra));
 }
 
 static int write_event_desc(struct feat_fd *ff,
                 struct evlist *evlist)
 {
     struct evsel *evsel;
     u32 nre, nri, sz;
     int ret;
 
     nre = evlist->core.nr_entries;
 
     /*
      * write number of events
      */
     ret = do_write(ff, &nre, sizeof(nre));
     if (ret < 0)
         return ret;
 
     /*
      * size of perf_event_attr struct
      */
     sz = (u32)sizeof(evsel->core.attr);
     ret = do_write(ff, &sz, sizeof(sz));
     if (ret < 0)
         return ret;
 
     evlist__for_each_entry(evlist, evsel) {
         ret = do_write(ff, &evsel->core.attr, sz);
         if (ret < 0)
             return ret;
         /*
          * write number of unique id per event
          * there is one id per instance of an event
          *
          * copy into an nri to be independent of the
          * type of ids,
          */
         nri = evsel->core.ids;
         ret = do_write(ff, &nri, sizeof(nri));
         if (ret < 0)
             return ret;
 
         /*
          * write event string as passed on cmdline
          */
         ret = do_write_string(ff, evsel__name(evsel));
         if (ret < 0)
             return ret;
         /*
          * write unique ids for this event
          */
         ret = do_write(ff, evsel->core.id, evsel->core.ids * sizeof(u64));
         if (ret < 0)
             return ret;
     }
     return 0;
 }
 
 static int write_cmdline(struct feat_fd *ff,
              struct evlist *evlist __maybe_unused)
 {
     char pbuf[MAXPATHLEN], *buf;
     int i, ret, n;
 
     /* actual path to perf binary */
     buf = perf_exe(pbuf, MAXPATHLEN);
 
     /* account for binary path */
     n = perf_env.nr_cmdline + 1;
 
     ret = do_write(ff, &n, sizeof(n));
     if (ret < 0)
         return ret;
 
     ret = do_write_string(ff, buf);
     if (ret < 0)
         return ret;
 
     for (i = 0 ; i < perf_env.nr_cmdline; i++) {
         ret = do_write_string(ff, perf_env.cmdline_argv[i]);
         if (ret < 0)
             return ret;
     }
     return 0;
 }
 
 
 static int write_cpu_topology(struct feat_fd *ff,
                   struct evlist *evlist __maybe_unused)
 {
     struct cpu_topology *tp;
     u32 i;
     int ret, j;
 
     tp = cpu_topology__new();
     if (!tp)
         return -1;
 
     ret = do_write(ff, &tp->package_cpus_lists, sizeof(tp->package_cpus_lists));
     if (ret < 0)
         goto done;
 
     for (i = 0; i < tp->package_cpus_lists; i++) {
         ret = do_write_string(ff, tp->package_cpus_list[i]);
         if (ret < 0)
             goto done;
     }
     ret = do_write(ff, &tp->core_cpus_lists, sizeof(tp->core_cpus_lists));
     if (ret < 0)
         goto done;
 
     for (i = 0; i < tp->core_cpus_lists; i++) {
         ret = do_write_string(ff, tp->core_cpus_list[i]);
         if (ret < 0)
             break;
     }
 
     ret = perf_env__read_cpu_topology_map(&perf_env);
     if (ret < 0)
         goto done;
 
     for (j = 0; j < perf_env.nr_cpus_avail; j++) {
         ret = do_write(ff, &perf_env.cpu[j].core_id,
                    sizeof(perf_env.cpu[j].core_id));
         if (ret < 0)
             return ret;
         ret = do_write(ff, &perf_env.cpu[j].socket_id,
                    sizeof(perf_env.cpu[j].socket_id));
         if (ret < 0)
             return ret;
     }
 
     if (!tp->die_cpus_lists)
         goto done;
 
     ret = do_write(ff, &tp->die_cpus_lists, sizeof(tp->die_cpus_lists));
     if (ret < 0)
         goto done;
 
     for (i = 0; i < tp->die_cpus_lists; i++) {
         ret = do_write_string(ff, tp->die_cpus_list[i]);
         if (ret < 0)
             goto done;
     }
 
     for (j = 0; j < perf_env.nr_cpus_avail; j++) {
         ret = do_write(ff, &perf_env.cpu[j].die_id,
                    sizeof(perf_env.cpu[j].die_id));
         if (ret < 0)
             return ret;
     }
 
 done:
     cpu_topology__delete(tp);
     return ret;
 }
 
 
 
 static int write_total_mem(struct feat_fd *ff,
                struct evlist *evlist __maybe_unused)
 {
     char *buf = NULL;
     FILE *fp;
     size_t len = 0;
     int ret = -1, n;
     uint64_t mem;
 
     fp = fopen("/proc/meminfo", "r");
     if (!fp)
         return -1;
 
     while (getline(&buf, &len, fp) > 0) {
         ret = strncmp(buf, "MemTotal:", 9);
         if (!ret)
             break;
     }
     if (!ret) {
         n = sscanf(buf, "%*s %"PRIu64, &mem);
         if (n == 1)
             ret = do_write(ff, &mem, sizeof(mem));
     } else
         ret = -1;
     free(buf);
     fclose(fp);
     return ret;
 }
 
 static int write_numa_topology(struct feat_fd *ff,
                    struct evlist *evlist __maybe_unused)
 {
     struct numa_topology *tp;
     int ret = -1;
     u32 i;
 
     tp = numa_topology__new();
     if (!tp)
         return -ENOMEM;
 
     ret = do_write(ff, &tp->nr, sizeof(u32));
     if (ret < 0)
         goto err;
 
     for (i = 0; i < tp->nr; i++) {
         struct numa_topology_node *n = &tp->nodes[i];
 
         ret = do_write(ff, &n->node, sizeof(u32));
         if (ret < 0)
             goto err;
 
         ret = do_write(ff, &n->mem_total, sizeof(u64));
         if (ret)
             goto err;
 
         ret = do_write(ff, &n->mem_free, sizeof(u64));
         if (ret)
             goto err;
 
         ret = do_write_string(ff, n->cpus);
         if (ret < 0)
             goto err;
     }
 
     ret = 0;
 
 err:
     numa_topology__delete(tp);
     return ret;
 }
 
 /*
  * File format:
  *
  * struct pmu_mappings {
  *  u32 pmu_num;
  *  struct pmu_map {
  *      u32 type;
  *      char    name[];
  *  }[pmu_num];
  * };
  */
 
 static int write_pmu_mappings(struct feat_fd *ff,
                   struct evlist *evlist __maybe_unused)
 {
     struct perf_pmu *pmu = NULL;
     u32 pmu_num = 0;
     int ret;
 
     /*
      * Do a first pass to count number of pmu to avoid lseek so this
      * works in pipe mode as well.
      */
     while ((pmu = perf_pmu__scan(pmu))) {
         if (!pmu->name)
             continue;
         pmu_num++;
     }
 
     ret = do_write(ff, &pmu_num, sizeof(pmu_num));
     if (ret < 0)
         return ret;
 
     while ((pmu = perf_pmu__scan(pmu))) {
         if (!pmu->name)
             continue;
 
         ret = do_write(ff, &pmu->type, sizeof(pmu->type));
         if (ret < 0)
             return ret;
 
         ret = do_write_string(ff, pmu->name);
         if (ret < 0)
             return ret;
     }
 
     return 0;
 }
 
 /*
  * File format:
  *
  * struct group_descs {
  *  u32 nr_groups;
  *  struct group_desc {
  *      char    name[];
  *      u32 leader_idx;
  *      u32 nr_members;
  *  }[nr_groups];
  * };
  */
 static int write_group_desc(struct feat_fd *ff,
                 struct evlist *evlist)
 {
     u32 nr_groups = evlist->core.nr_groups;
     struct evsel *evsel;
     int ret;
 
     ret = do_write(ff, &nr_groups, sizeof(nr_groups));
     if (ret < 0)
         return ret;
 
     evlist__for_each_entry(evlist, evsel) {
         if (evsel__is_group_leader(evsel) && evsel->core.nr_members > 1) {
             const char *name = evsel->group_name ?: "{anon_group}";
             u32 leader_idx = evsel->core.idx;
             u32 nr_members = evsel->core.nr_members;
 
             ret = do_write_string(ff, name);
             if (ret < 0)
                 return ret;
 
             ret = do_write(ff, &leader_idx, sizeof(leader_idx));
             if (ret < 0)
                 return ret;
 
             ret = do_write(ff, &nr_members, sizeof(nr_members));
             if (ret < 0)
                 return ret;
         }
     }
     return 0;
 }
 
 /*
  * Return the CPU id as a raw string.
  *
  * Each architecture should provide a more precise id string that
  * can be use to match the architecture's "mapfile".
  */
 char * __weak get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
 {
     return NULL;
 }
 
 /* Return zero when the cpuid from the mapfile.csv matches the
  * cpuid string generated on this platform.
  * Otherwise return non-zero.
  */
 int __weak strcmp_cpuid_str(const char *mapcpuid, const char *cpuid)
 {
     regex_t re;
     regmatch_t pmatch[1];
     int match;
 
     if (regcomp(&re, mapcpuid, REG_EXTENDED) != 0) {
         /* Warn unable to generate match particular string. */
         pr_info("Invalid regular expression %s\n", mapcpuid);
         return 1;
     }
 
     match = !regexec(&re, cpuid, 1, pmatch, 0);
     regfree(&re);
     if (match) {
         size_t match_len = (pmatch[0].rm_eo - pmatch[0].rm_so);
 
         /* Verify the entire string matched. */
         if (match_len == strlen(cpuid))
             return 0;
     }
     return 1;
 }
 
 /*
  * default get_cpuid(): nothing gets recorded
  * actual implementation must be in arch/$(SRCARCH)/util/header.c
  */
 int __weak get_cpuid(char *buffer __maybe_unused, size_t sz __maybe_unused)
 {
     return ENOSYS; /* Not implemented */
 }
 
 static int write_cpuid(struct feat_fd *ff,
                struct evlist *evlist __maybe_unused)
 {
     char buffer[64];
     int ret;
 
     ret = get_cpuid(buffer, sizeof(buffer));
     if (ret)
         return -1;
 
     return do_write_string(ff, buffer);
 }
 
 static int write_branch_stack(struct feat_fd *ff __maybe_unused,
                   struct evlist *evlist __maybe_unused)
 {
     return 0;
 }
 
 static int write_auxtrace(struct feat_fd *ff,
               struct evlist *evlist __maybe_unused)
 {
     struct perf_session *session;
     int err;
 
     if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))
         return -1;
 
     session = container_of(ff->ph, struct perf_session, header);
 
     err = auxtrace_index__write(ff->fd, &session->auxtrace_index);
     if (err < 0)
         pr_err("Failed to write auxtrace index\n");
     return err;
 }
 
 static int write_clockid(struct feat_fd *ff,
              struct evlist *evlist __maybe_unused)
 {
     return do_write(ff, &ff->ph->env.clock.clockid_res_ns,
             sizeof(ff->ph->env.clock.clockid_res_ns));
 }
 
 static int write_clock_data(struct feat_fd *ff,
                 struct evlist *evlist __maybe_unused)
 {
     u64 *data64;
     u32 data32;
     int ret;
 
     /* version */
     data32 = 1;
 
     ret = do_write(ff, &data32, sizeof(data32));
     if (ret < 0)
         return ret;
 
     /* clockid */
     data32 = ff->ph->env.clock.clockid;
 
     ret = do_write(ff, &data32, sizeof(data32));
     if (ret < 0)
         return ret;
 
     /* TOD ref time */
     data64 = &ff->ph->env.clock.tod_ns;
 
     ret = do_write(ff, data64, sizeof(*data64));
     if (ret < 0)
         return ret;
 
     /* clockid ref time */
     data64 = &ff->ph->env.clock.clockid_ns;
 
     return do_write(ff, data64, sizeof(*data64));
 }
 
 static int write_hybrid_topology(struct feat_fd *ff,
                  struct evlist *evlist __maybe_unused)
 {
     struct hybrid_topology *tp;
     int ret;
     u32 i;
 
     tp = hybrid_topology__new();
     if (!tp)
         return -ENOENT;
 
     ret = do_write(ff, &tp->nr, sizeof(u32));
     if (ret < 0)
         goto err;
 
     for (i = 0; i < tp->nr; i++) {
         struct hybrid_topology_node *n = &tp->nodes[i];
 
         ret = do_write_string(ff, n->pmu_name);
         if (ret < 0)
             goto err;
 
         ret = do_write_string(ff, n->cpus);
         if (ret < 0)
             goto err;
     }
 
     ret = 0;
 
 err:
     hybrid_topology__delete(tp);
     return ret;
 }
 
 static int write_dir_format(struct feat_fd *ff,
                 struct evlist *evlist __maybe_unused)
 {
     struct perf_session *session;
     struct perf_data *data;
 
     session = container_of(ff->ph, struct perf_session, header);
     data = session->data;
 
     if (WARN_ON(!perf_data__is_dir(data)))
         return -1;
 
     return do_write(ff, &data->dir.version, sizeof(data->dir.version));
 }
 
 /*
  * Check whether a CPU is online
  *
  * Returns:
  *     1 -> if CPU is online
  *     0 -> if CPU is offline
  *    -1 -> error case
  */
 int is_cpu_online(unsigned int cpu)
 {
     char *str;
     size_t strlen;
     char buf[256];
     int status = -1;
     struct stat statbuf;
 
     snprintf(buf, sizeof(buf),
         "/sys/devices/system/cpu/cpu%d", cpu);
     if (stat(buf, &statbuf) != 0)
         return 0;
 
     /*
      * Check if /sys/devices/system/cpu/cpux/online file
      * exists. Some cases cpu0 won't have online file since
      * it is not expected to be turned off generally.
      * In kernels without CONFIG_HOTPLUG_CPU, this
      * file won't exist
      */
     snprintf(buf, sizeof(buf),
         "/sys/devices/system/cpu/cpu%d/online", cpu);
     if (stat(buf, &statbuf) != 0)
         return 1;
 
     /*
      * Read online file using sysfs__read_str.
      * If read or open fails, return -1.
      * If read succeeds, return value from file
      * which gets stored in "str"
      */
     snprintf(buf, sizeof(buf),
         "devices/system/cpu/cpu%d/online", cpu);
 
     if (sysfs__read_str(buf, &str, &strlen) < 0)
         return status;
 
     status = atoi(str);
 
     free(str);
     return status;
 }
 
 #ifdef HAVE_LIBBPF_SUPPORT
 static int write_bpf_prog_info(struct feat_fd *ff,
                    struct evlist *evlist __maybe_unused)
 {
     struct perf_env *env = &ff->ph->env;
     struct rb_root *root;
     struct rb_node *next;
     int ret;
 
     down_read(&env->bpf_progs.lock);
 
     ret = do_write(ff, &env->bpf_progs.infos_cnt,
                sizeof(env->bpf_progs.infos_cnt));
     if (ret < 0)
         goto out;
 
     root = &env->bpf_progs.infos;
     next = rb_first(root);
     while (next) {
         struct bpf_prog_info_node *node;
         size_t len;
 
         node = rb_entry(next, struct bpf_prog_info_node, rb_node);
         next = rb_next(&node->rb_node);
         len = sizeof(struct perf_bpil) +
             node->info_linear->data_len;
 
         /* before writing to file, translate address to offset */
         bpil_addr_to_offs(node->info_linear);
         ret = do_write(ff, node->info_linear, len);
         /*
          * translate back to address even when do_write() fails,
          * so that this function never changes the data.
          */
         bpil_offs_to_addr(node->info_linear);
         if (ret < 0)
             goto out;
     }
 out:
     up_read(&env->bpf_progs.lock);
     return ret;
 }
 
 static int write_bpf_btf(struct feat_fd *ff,
              struct evlist *evlist __maybe_unused)
 {
     struct perf_env *env = &ff->ph->env;
     struct rb_root *root;
     struct rb_node *next;
     int ret;
 
     down_read(&env->bpf_progs.lock);
 
     ret = do_write(ff, &env->bpf_progs.btfs_cnt,
                sizeof(env->bpf_progs.btfs_cnt));
 
     if (ret < 0)
         goto out;
 
     root = &env->bpf_progs.btfs;
     next = rb_first(root);
     while (next) {
         struct btf_node *node;
 
         node = rb_entry(next, struct btf_node, rb_node);
         next = rb_next(&node->rb_node);
         ret = do_write(ff, &node->id,
                    sizeof(u32) * 2 + node->data_size);
         if (ret < 0)
             goto out;
     }
 out:
     up_read(&env->bpf_progs.lock);
     return ret;
 }
 #endif // HAVE_LIBBPF_SUPPORT
 
 static int cpu_cache_level__sort(const void *a, const void *b)
 {
     struct cpu_cache_level *cache_a = (struct cpu_cache_level *)a;
     struct cpu_cache_level *cache_b = (struct cpu_cache_level *)b;
 
     return cache_a->level - cache_b->level;
 }
 
 static bool cpu_cache_level__cmp(struct cpu_cache_level *a, struct cpu_cache_level *b)
 {
     if (a->level != b->level)
         return false;
 
     if (a->line_size != b->line_size)
         return false;
 
     if (a->sets != b->sets)
         return false;
 
     if (a->ways != b->ways)
         return false;
 
     if (strcmp(a->type, b->type))
         return false;
 
     if (strcmp(a->size, b->size))
         return false;
 
     if (strcmp(a->map, b->map))
         return false;
 
     return true;
 }
 
 static int cpu_cache_level__read(struct cpu_cache_level *cache, u32 cpu, u16 level)
 {
     char path[PATH_MAX], file[PATH_MAX];
     struct stat st;
     size_t len;
 
     scnprintf(path, PATH_MAX, "devices/system/cpu/cpu%d/cache/index%d/", cpu, level);
     scnprintf(file, PATH_MAX, "%s/%s", sysfs__mountpoint(), path);
 
     if (stat(file, &st))
         return 1;
 
     scnprintf(file, PATH_MAX, "%s/level", path);
     if (sysfs__read_int(file, (int *) &cache->level))
         return -1;
 
     scnprintf(file, PATH_MAX, "%s/coherency_line_size", path);
     if (sysfs__read_int(file, (int *) &cache->line_size))
         return -1;
 
     scnprintf(file, PATH_MAX, "%s/number_of_sets", path);
     if (sysfs__read_int(file, (int *) &cache->sets))
         return -1;
 
     scnprintf(file, PATH_MAX, "%s/ways_of_associativity", path);
     if (sysfs__read_int(file, (int *) &cache->ways))
         return -1;
 
     scnprintf(file, PATH_MAX, "%s/type", path);
     if (sysfs__read_str(file, &cache->type, &len))
         return -1;
 
     cache->type[len] = 0;
     cache->type = strim(cache->type);
 
     scnprintf(file, PATH_MAX, "%s/size", path);
     if (sysfs__read_str(file, &cache->size, &len)) {
         zfree(&cache->type);
         return -1;
     }
 
     cache->size[len] = 0;
     cache->size = strim(cache->size);
 
     scnprintf(file, PATH_MAX, "%s/shared_cpu_list", path);
     if (sysfs__read_str(file, &cache->map, &len)) {
         zfree(&cache->size);
         zfree(&cache->type);
         return -1;
     }
 
     cache->map[len] = 0;
     cache->map = strim(cache->map);
     return 0;
 }
 
 static void cpu_cache_level__fprintf(FILE *out, struct cpu_cache_level *c)
 {
     fprintf(out, "L%d %-15s %8s [%s]\n", c->level, c->type, c->size, c->map);
 }
 
 #define MAX_CACHE_LVL 4
 
 static int build_caches(struct cpu_cache_level caches[], u32 *cntp)
 {
     u32 i, cnt = 0;
     u32 nr, cpu;
     u16 level;
 
     nr = cpu__max_cpu().cpu;
 
     for (cpu = 0; cpu < nr; cpu++) {
         for (level = 0; level < MAX_CACHE_LVL; level++) {
             struct cpu_cache_level c;
             int err;
 
             err = cpu_cache_level__read(&c, cpu, level);
             if (err < 0)
                 return err;
 
             if (err == 1)
                 break;
 
             for (i = 0; i < cnt; i++) {
                 if (cpu_cache_level__cmp(&c, &caches[i]))
                     break;
             }
 
             if (i == cnt)
                 caches[cnt++] = c;
             else
                 cpu_cache_level__free(&c);
         }
     }
     *cntp = cnt;
     return 0;
 }
 
 static int write_cache(struct feat_fd *ff,
                struct evlist *evlist __maybe_unused)
 {
     u32 max_caches = cpu__max_cpu().cpu * MAX_CACHE_LVL;
     struct cpu_cache_level caches[max_caches];
     u32 cnt = 0, i, version = 1;
     int ret;
 
     ret = build_caches(caches, &cnt);
     if (ret)
         goto out;
 
     qsort(&caches, cnt, sizeof(struct cpu_cache_level), cpu_cache_level__sort);
 
     ret = do_write(ff, &version, sizeof(u32));
     if (ret < 0)
         goto out;
 
     ret = do_write(ff, &cnt, sizeof(u32));
     if (ret < 0)
         goto out;
 
     for (i = 0; i < cnt; i++) {
         struct cpu_cache_level *c = &caches[i];
 
         #define _W(v)                   \
             ret = do_write(ff, &c->v, sizeof(u32)); \
             if (ret < 0)                \
                 goto out;
 
         _W(level)
         _W(line_size)
         _W(sets)
         _W(ways)
         #undef _W
 
         #define _W(v)                       \
             ret = do_write_string(ff, (const char *) c->v); \
             if (ret < 0)                    \
                 goto out;
 
         _W(type)
         _W(size)
         _W(map)
         #undef _W
     }
 
 out:
     for (i = 0; i < cnt; i++)
         cpu_cache_level__free(&caches[i]);
     return ret;
 }
 
 static int write_stat(struct feat_fd *ff __maybe_unused,
               struct evlist *evlist __maybe_unused)
 {
     return 0;
 }
 
 static int write_sample_time(struct feat_fd *ff,
                  struct evlist *evlist)
 {
     int ret;
 
     ret = do_write(ff, &evlist->first_sample_time,
                sizeof(evlist->first_sample_time));
     if (ret < 0)
         return ret;
 
     return do_write(ff, &evlist->last_sample_time,
             sizeof(evlist->last_sample_time));
 }
 
 
 static int memory_node__read(struct memory_node *n, unsigned long idx)
 {
     unsigned int phys, size = 0;
     char path[PATH_MAX];
     struct dirent *ent;
     DIR *dir;
 
 #define for_each_memory(mem, dir)                   \
     while ((ent = readdir(dir)))                    \
         if (strcmp(ent->d_name, ".") &&             \
             strcmp(ent->d_name, "..") &&            \
             sscanf(ent->d_name, "memory%u", &mem) == 1)
 
     scnprintf(path, PATH_MAX,
           "%s/devices/system/node/node%lu",
           sysfs__mountpoint(), idx);
 
     dir = opendir(path);
     if (!dir) {
         pr_warning("failed: can't open memory sysfs data\n");
         return -1;
     }
 
     for_each_memory(phys, dir) {
         size = max(phys, size);
     }
 
     size++;
 
     n->set = bitmap_zalloc(size);
     if (!n->set) {
         closedir(dir);
         return -ENOMEM;
     }
 
     n->node = idx;
     n->size = size;
 
     rewinddir(dir);
 
     for_each_memory(phys, dir) {
         set_bit(phys, n->set);
     }
 
     closedir(dir);
     return 0;
 }
 
 static int memory_node__sort(const void *a, const void *b)
 {
     const struct memory_node *na = a;
     const struct memory_node *nb = b;
 
     return na->node - nb->node;
 }
 
 static int build_mem_topology(struct memory_node *nodes, u64 size, u64 *cntp)
 {
     char path[PATH_MAX];
     struct dirent *ent;
     DIR *dir;
     u64 cnt = 0;
     int ret = 0;
 
     scnprintf(path, PATH_MAX, "%s/devices/system/node/",
           sysfs__mountpoint());
 
     dir = opendir(path);
     if (!dir) {
         pr_debug2("%s: couldn't read %s, does this arch have topology information?\n",
               __func__, path);
         return -1;
     }
 
     while (!ret && (ent = readdir(dir))) {
         unsigned int idx;
         int r;
 
         if (!strcmp(ent->d_name, ".") ||
             !strcmp(ent->d_name, ".."))
             continue;
 
         r = sscanf(ent->d_name, "node%u", &idx);
         if (r != 1)
             continue;
 
         if (WARN_ONCE(cnt >= size,
             "failed to write MEM_TOPOLOGY, way too many nodes\n")) {
             closedir(dir);
             return -1;
         }
 
         ret = memory_node__read(&nodes[cnt++], idx);
     }
 
     *cntp = cnt;
     closedir(dir);
 
     if (!ret)
         qsort(nodes, cnt, sizeof(nodes[0]), memory_node__sort);
 
     return ret;
 }
 
 #define MAX_MEMORY_NODES 2000
 
 /*
  * The MEM_TOPOLOGY holds physical memory map for every
  * node in system. The format of data is as follows:
  *
  *  0 - version          | for future changes
  *  8 - block_size_bytes | /sys/devices/system/memory/block_size_bytes
  * 16 - count            | number of nodes
  *
  * For each node we store map of physical indexes for
  * each node:
  *
  * 32 - node id          | node index
  * 40 - size             | size of bitmap
  * 48 - bitmap           | bitmap of memory indexes that belongs to node
  */
 static int write_mem_topology(struct feat_fd *ff __maybe_unused,
                   struct evlist *evlist __maybe_unused)
 {
     static struct memory_node nodes[MAX_MEMORY_NODES];
     u64 bsize, version = 1, i, nr;
     int ret;
 
     ret = sysfs__read_xll("devices/system/memory/block_size_bytes",
                   (unsigned long long *) &bsize);
     if (ret)
         return ret;
 
     ret = build_mem_topology(&nodes[0], MAX_MEMORY_NODES, &nr);
     if (ret)
         return ret;
 
     ret = do_write(ff, &version, sizeof(version));
     if (ret < 0)
         goto out;
 
     ret = do_write(ff, &bsize, sizeof(bsize));
     if (ret < 0)
         goto out;
 
     ret = do_write(ff, &nr, sizeof(nr));
     if (ret < 0)
         goto out;
 
     for (i = 0; i < nr; i++) {
         struct memory_node *n = &nodes[i];
 
         #define _W(v)                       \
             ret = do_write(ff, &n->v, sizeof(n->v));    \
             if (ret < 0)                    \
                 goto out;
 
         _W(node)
         _W(size)
 
         #undef _W
 
         ret = do_write_bitmap(ff, n->set, n->size);
         if (ret < 0)
             goto out;
     }
 
 out:
     return ret;
 }
 
 static int write_compressed(struct feat_fd *ff __maybe_unused,
                 struct evlist *evlist __maybe_unused)
 {
     int ret;
 
     ret = do_write(ff, &(ff->ph->env.comp_ver), sizeof(ff->ph->env.comp_ver));
     if (ret)
         return ret;
 
     ret = do_write(ff, &(ff->ph->env.comp_type), sizeof(ff->ph->env.comp_type));
     if (ret)
         return ret;
 
     ret = do_write(ff, &(ff->ph->env.comp_level), sizeof(ff->ph->env.comp_level));
     if (ret)
         return ret;
 
     ret = do_write(ff, &(ff->ph->env.comp_ratio), sizeof(ff->ph->env.comp_ratio));
     if (ret)
         return ret;
 
     return do_write(ff, &(ff->ph->env.comp_mmap_len), sizeof(ff->ph->env.comp_mmap_len));
 }
 
 static int __write_pmu_caps(struct feat_fd *ff, struct perf_pmu *pmu,
                 bool write_pmu)
 {
     struct perf_pmu_caps *caps = NULL;
     int ret;
 
     ret = do_write(ff, &pmu->nr_caps, sizeof(pmu->nr_caps));
     if (ret < 0)
         return ret;
 
     list_for_each_entry(caps, &pmu->caps, list) {
         ret = do_write_string(ff, caps->name);
         if (ret < 0)
             return ret;
 
         ret = do_write_string(ff, caps->value);
         if (ret < 0)
             return ret;
     }
 
     if (write_pmu) {
         ret = do_write_string(ff, pmu->name);
         if (ret < 0)
             return ret;
     }
 
     return ret;
 }
 
 static int write_cpu_pmu_caps(struct feat_fd *ff,
                   struct evlist *evlist __maybe_unused)
 {
     struct perf_pmu *cpu_pmu = perf_pmu__find("cpu");
     int ret;
 
     if (!cpu_pmu)
         return -ENOENT;
 
     ret = perf_pmu__caps_parse(cpu_pmu);
     if (ret < 0)
         return ret;
 
     return __write_pmu_caps(ff, cpu_pmu, false);
 }
 
 static int write_pmu_caps(struct feat_fd *ff,
               struct evlist *evlist __maybe_unused)
 {
     struct perf_pmu *pmu = NULL;
     int nr_pmu = 0;
     int ret;
 
     while ((pmu = perf_pmu__scan(pmu))) {
         if (!pmu->name || !strcmp(pmu->name, "cpu") ||
             perf_pmu__caps_parse(pmu) <= 0)
             continue;
         nr_pmu++;
     }
 
     ret = do_write(ff, &nr_pmu, sizeof(nr_pmu));
     if (ret < 0)
         return ret;
 
     if (!nr_pmu)
         return 0;
 
     /*
      * Write hybrid pmu caps first to maintain compatibility with
      * older perf tool.
      */
     pmu = NULL;
     perf_pmu__for_each_hybrid_pmu(pmu) {
         ret = __write_pmu_caps(ff, pmu, true);
         if (ret < 0)
             return ret;
     }
 
     pmu = NULL;
     while ((pmu = perf_pmu__scan(pmu))) {
         if (!pmu->name || !strcmp(pmu->name, "cpu") ||
             !pmu->nr_caps || perf_pmu__is_hybrid(pmu->name))
             continue;
 
         ret = __write_pmu_caps(ff, pmu, true);
         if (ret < 0)
             return ret;
     }
     return 0;
 }
 
 static void print_hostname(struct feat_fd *ff, FILE *fp)
 {
     fprintf(fp, "# hostname : %s\n", ff->ph->env.hostname);
 }
 
 static void print_osrelease(struct feat_fd *ff, FILE *fp)
 {
     fprintf(fp, "# os release : %s\n", ff->ph->env.os_release);
 }
 
 static void print_arch(struct feat_fd *ff, FILE *fp)
 {
     fprintf(fp, "# arch : %s\n", ff->ph->env.arch);
 }
 
 static void print_cpudesc(struct feat_fd *ff, FILE *fp)
 {
     fprintf(fp, "# cpudesc : %s\n", ff->ph->env.cpu_desc);
 }
 
 static void print_nrcpus(struct feat_fd *ff, FILE *fp)
 {
     fprintf(fp, "# nrcpus online : %u\n", ff->ph->env.nr_cpus_online);
     fprintf(fp, "# nrcpus avail : %u\n", ff->ph->env.nr_cpus_avail);
 }
 
 static void print_version(struct feat_fd *ff, FILE *fp)
 {
     fprintf(fp, "# perf version : %s\n", ff->ph->env.version);
 }
 
 static void print_cmdline(struct feat_fd *ff, FILE *fp)
 {
     int nr, i;
 
     nr = ff->ph->env.nr_cmdline;
 
     fprintf(fp, "# cmdline : ");
 
     for (i = 0; i < nr; i++) {
         char *argv_i = strdup(ff->ph->env.cmdline_argv[i]);
         if (!argv_i) {
             fprintf(fp, "%s ", ff->ph->env.cmdline_argv[i]);
         } else {
             char *mem = argv_i;
             do {
                 char *quote = strchr(argv_i, '\'');
                 if (!quote)
                     break;
                 *quote++ = '\0';
                 fprintf(fp, "%s\\\'", argv_i);
                 argv_i = quote;
             } while (1);
             fprintf(fp, "%s ", argv_i);
             free(mem);
         }
     }
     fputc('\n', fp);
 }
 
 static void print_cpu_topology(struct feat_fd *ff, FILE *fp)
 {
     struct perf_header *ph = ff->ph;
     int cpu_nr = ph->env.nr_cpus_avail;
     int nr, i;
     char *str;
 
     nr = ph->env.nr_sibling_cores;
     str = ph->env.sibling_cores;
 
     for (i = 0; i < nr; i++) {
         fprintf(fp, "# sibling sockets : %s\n", str);
         str += strlen(str) + 1;
     }
 
     if (ph->env.nr_sibling_dies) {
         nr = ph->env.nr_sibling_dies;
         str = ph->env.sibling_dies;
 
         for (i = 0; i < nr; i++) {
             fprintf(fp, "# sibling dies    : %s\n", str);
             str += strlen(str) + 1;
         }
     }
 
     nr = ph->env.nr_sibling_threads;
     str = ph->env.sibling_threads;
 
     for (i = 0; i < nr; i++) {
         fprintf(fp, "# sibling threads : %s\n", str);
         str += strlen(str) + 1;
     }
 
     if (ph->env.nr_sibling_dies) {
         if (ph->env.cpu != NULL) {
             for (i = 0; i < cpu_nr; i++)
                 fprintf(fp, "# CPU %d: Core ID %d, "
                         "Die ID %d, Socket ID %d\n",
                         i, ph->env.cpu[i].core_id,
                         ph->env.cpu[i].die_id,
                         ph->env.cpu[i].socket_id);
         } else
             fprintf(fp, "# Core ID, Die ID and Socket ID "
                     "information is not available\n");
     } else {
         if (ph->env.cpu != NULL) {
             for (i = 0; i < cpu_nr; i++)
                 fprintf(fp, "# CPU %d: Core ID %d, "
                         "Socket ID %d\n",
                         i, ph->env.cpu[i].core_id,
                         ph->env.cpu[i].socket_id);
         } else
             fprintf(fp, "# Core ID and Socket ID "
                     "information is not available\n");
     }
 }
 
 static void print_clockid(struct feat_fd *ff, FILE *fp)
 {
     fprintf(fp, "# clockid frequency: %"PRIu64" MHz\n",
         ff->ph->env.clock.clockid_res_ns * 1000);
 }
 
 static void print_clock_data(struct feat_fd *ff, FILE *fp)
 {
     struct timespec clockid_ns;
     char tstr[64], date[64];
     struct timeval tod_ns;
     clockid_t clockid;
     struct tm ltime;
     u64 ref;
 
     if (!ff->ph->env.clock.enabled) {
         fprintf(fp, "# reference time disabled\n");
         return;
     }
 
     /* Compute TOD time. */
     ref = ff->ph->env.clock.tod_ns;
     tod_ns.tv_sec = ref / NSEC_PER_SEC;
     ref -= tod_ns.tv_sec * NSEC_PER_SEC;
     tod_ns.tv_usec = ref / NSEC_PER_USEC;
 
     /* Compute clockid time. */
     ref = ff->ph->env.clock.clockid_ns;
     clockid_ns.tv_sec = ref / NSEC_PER_SEC;
     ref -= clockid_ns.tv_sec * NSEC_PER_SEC;
     clockid_ns.tv_nsec = ref;
 
     clockid = ff->ph->env.clock.clockid;
 
     if (localtime_r(&tod_ns.tv_sec, &ltime) == NULL)
         snprintf(tstr, sizeof(tstr), "<error>");
     else {
         strftime(date, sizeof(date), "%F %T", &ltime);
         scnprintf(tstr, sizeof(tstr), "%s.%06d",
               date, (int) tod_ns.tv_usec);
     }
 
     fprintf(fp, "# clockid: %s (%u)\n", clockid_name(clockid), clockid);
     fprintf(fp, "# reference time: %s = %ld.%06d (TOD) = %ld.%09ld (%s)\n",
             tstr, (long) tod_ns.tv_sec, (int) tod_ns.tv_usec,
             (long) clockid_ns.tv_sec, clockid_ns.tv_nsec,
             clockid_name(clockid));
 }
 
 static void print_hybrid_topology(struct feat_fd *ff, FILE *fp)
 {
     int i;
     struct hybrid_node *n;
 
     fprintf(fp, "# hybrid cpu system:\n");
     for (i = 0; i < ff->ph->env.nr_hybrid_nodes; i++) {
         n = &ff->ph->env.hybrid_nodes[i];
         fprintf(fp, "# %s cpu list : %s\n", n->pmu_name, n->cpus);
     }
 }
 
 static void print_dir_format(struct feat_fd *ff, FILE *fp)
 {
     struct perf_session *session;
     struct perf_data *data;
 
     session = container_of(ff->ph, struct perf_session, header);
     data = session->data;
 
     fprintf(fp, "# directory data version : %"PRIu64"\n", data->dir.version);
 }
 
 #ifdef HAVE_LIBBPF_SUPPORT
 static void print_bpf_prog_info(struct feat_fd *ff, FILE *fp)
 {
     struct perf_env *env = &ff->ph->env;
     struct rb_root *root;
     struct rb_node *next;
 
     down_read(&env->bpf_progs.lock);
 
     root = &env->bpf_progs.infos;
     next = rb_first(root);
 
     while (next) {
         struct bpf_prog_info_node *node;
 
         node = rb_entry(next, struct bpf_prog_info_node, rb_node);
         next = rb_next(&node->rb_node);
 
         bpf_event__print_bpf_prog_info(&node->info_linear->info,
                            env, fp);
     }
 
     up_read(&env->bpf_progs.lock);
 }
 
 static void print_bpf_btf(struct feat_fd *ff, FILE *fp)
 {
     struct perf_env *env = &ff->ph->env;
     struct rb_root *root;
     struct rb_node *next;
 
     down_read(&env->bpf_progs.lock);
 
     root = &env->bpf_progs.btfs;
     next = rb_first(root);
 
     while (next) {
         struct btf_node *node;
 
         node = rb_entry(next, struct btf_node, rb_node);
         next = rb_next(&node->rb_node);
         fprintf(fp, "# btf info of id %u\n", node->id);
     }
 
     up_read(&env->bpf_progs.lock);
 }
 #endif // HAVE_LIBBPF_SUPPORT
 
 static void free_event_desc(struct evsel *events)
 {
     struct evsel *evsel;
 
     if (!events)
         return;
 
     for (evsel = events; evsel->core.attr.size; evsel++) {
         zfree(&evsel->name);
         zfree(&evsel->core.id);
     }
 
     free(events);
 }
 
 static bool perf_attr_check(struct perf_event_attr *attr)
 {
     if (attr->__reserved_1 || attr->__reserved_2 || attr->__reserved_3) {
         pr_warning("Reserved bits are set unexpectedly. "
                "Please update perf tool.\n");
         return false;
     }
 
     if (attr->sample_type & ~(PERF_SAMPLE_MAX-1)) {
         pr_warning("Unknown sample type (0x%llx) is detected. "
                "Please update perf tool.\n",
                attr->sample_type);
         return false;
     }
 
     if (attr->read_format & ~(PERF_FORMAT_MAX-1)) {
         pr_warning("Unknown read format (0x%llx) is detected. "
                "Please update perf tool.\n",
                attr->read_format);
         return false;
     }
 
     if ((attr->sample_type & PERF_SAMPLE_BRANCH_STACK) &&
         (attr->branch_sample_type & ~(PERF_SAMPLE_BRANCH_MAX-1))) {
         pr_warning("Unknown branch sample type (0x%llx) is detected. "
                "Please update perf tool.\n",
                attr->branch_sample_type);
 
         return false;
     }
 
     return true;
 }
 
 static struct evsel *read_event_desc(struct feat_fd *ff)
 {
     struct evsel *evsel, *events = NULL;
     u64 *id;
     void *buf = NULL;
     u32 nre, sz, nr, i, j;
     size_t msz;
 
     /* number of events */
     if (do_read_u32(ff, &nre))
         goto error;
 
     if (do_read_u32(ff, &sz))
         goto error;
 
     /* buffer to hold on file attr struct */
     buf = malloc(sz);
     if (!buf)
         goto error;
 
     /* the last event terminates with evsel->core.attr.size == 0: */
     events = calloc(nre + 1, sizeof(*events));
     if (!events)
         goto error;
 
     msz = sizeof(evsel->core.attr);
     if (sz < msz)
         msz = sz;
 
     for (i = 0, evsel = events; i < nre; evsel++, i++) {
         evsel->core.idx = i;
 
         /*
          * must read entire on-file attr struct to
          * sync up with layout.
          */
         if (__do_read(ff, buf, sz))
             goto error;
 
         if (ff->ph->needs_swap)
             perf_event__attr_swap(buf);
 
         memcpy(&evsel->core.attr, buf, msz);
 
         if (!perf_attr_check(&evsel->core.attr))
             goto error;
 
         if (do_read_u32(ff, &nr))
             goto error;
 
         if (ff->ph->needs_swap)
             evsel->needs_swap = true;
 
         evsel->name = do_read_string(ff);
         if (!evsel->name)
             goto error;
 
         if (!nr)
             continue;
 
         id = calloc(nr, sizeof(*id));
         if (!id)
             goto error;
         evsel->core.ids = nr;
         evsel->core.id = id;
 
         for (j = 0 ; j < nr; j++) {
             if (do_read_u64(ff, id))
                 goto error;
             id++;
         }
     }
 out:
     free(buf);
     return events;
 error:
     free_event_desc(events);
     events = NULL;
     goto out;
 }
 
 static int __desc_attr__fprintf(FILE *fp, const char *name, const char *val,
                 void *priv __maybe_unused)
 {
     return fprintf(fp, ", %s = %s", name, val);
 }
 
 static void print_event_desc(struct feat_fd *ff, FILE *fp)
 {
     struct evsel *evsel, *events;
     u32 j;
     u64 *id;
 
     if (ff->events)
         events = ff->events;
     else
         events = read_event_desc(ff);
 
     if (!events) {
         fprintf(fp, "# event desc: not available or unable to read\n");
         return;
     }
 
     for (evsel = events; evsel->core.attr.size; evsel++) {
         fprintf(fp, "# event : name = %s, ", evsel->name);
 
         if (evsel->core.ids) {
             fprintf(fp, ", id = {");
             for (j = 0, id = evsel->core.id; j < evsel->core.ids; j++, id++) {
                 if (j)
                     fputc(',', fp);
                 fprintf(fp, " %"PRIu64, *id);
             }
             fprintf(fp, " }");
         }
 
         perf_event_attr__fprintf(fp, &evsel->core.attr, __desc_attr__fprintf, NULL);
 
         fputc('\n', fp);
     }
 
     free_event_desc(events);
     ff->events = NULL;
 }
 
 static void print_total_mem(struct feat_fd *ff, FILE *fp)
 {
     fprintf(fp, "# total memory : %llu kB\n", ff->ph->env.total_mem);
 }
 
 static void print_numa_topology(struct feat_fd *ff, FILE *fp)
 {
     int i;
     struct numa_node *n;
 
     for (i = 0; i < ff->ph->env.nr_numa_nodes; i++) {
         n = &ff->ph->env.numa_nodes[i];
 
         fprintf(fp, "# node%u meminfo  : total = %"PRIu64" kB,"
                 " free = %"PRIu64" kB\n",
             n->node, n->mem_total, n->mem_free);
 
         fprintf(fp, "# node%u cpu list : ", n->node);
         cpu_map__fprintf(n->map, fp);
     }
 }
 
 static void print_cpuid(struct feat_fd *ff, FILE *fp)
 {
     fprintf(fp, "# cpuid : %s\n", ff->ph->env.cpuid);
 }
 
 static void print_branch_stack(struct feat_fd *ff __maybe_unused, FILE *fp)
 {
     fprintf(fp, "# contains samples with branch stack\n");
 }
 
 static void print_auxtrace(struct feat_fd *ff __maybe_unused, FILE *fp)
 {
     fprintf(fp, "# contains AUX area data (e.g. instruction trace)\n");
 }
 
 static void print_stat(struct feat_fd *ff __maybe_unused, FILE *fp)
 {
     fprintf(fp, "# contains stat data\n");
 }
 
 static void print_cache(struct feat_fd *ff, FILE *fp __maybe_unused)
 {
     int i;
 
     fprintf(fp, "# CPU cache info:\n");
     for (i = 0; i < ff->ph->env.caches_cnt; i++) {
         fprintf(fp, "#  ");
         cpu_cache_level__fprintf(fp, &ff->ph->env.caches[i]);
     }
 }
 
 static void print_compressed(struct feat_fd *ff, FILE *fp)
 {
     fprintf(fp, "# compressed : %s, level = %d, ratio = %d\n",
         ff->ph->env.comp_type == PERF_COMP_ZSTD ? "Zstd" : "Unknown",
         ff->ph->env.comp_level, ff->ph->env.comp_ratio);
 }
 
 static void __print_pmu_caps(FILE *fp, int nr_caps, char **caps, char *pmu_name)
 {
     const char *delimiter = "";
     int i;
 
     if (!nr_caps) {
         fprintf(fp, "# %s pmu capabilities: not available\n", pmu_name);
         return;
     }
 
     fprintf(fp, "# %s pmu capabilities: ", pmu_name);
     for (i = 0; i < nr_caps; i++) {
         fprintf(fp, "%s%s", delimiter, caps[i]);
         delimiter = ", ";
     }
 
     fprintf(fp, "\n");
 }
 
 static void print_cpu_pmu_caps(struct feat_fd *ff, FILE *fp)
 {
     __print_pmu_caps(fp, ff->ph->env.nr_cpu_pmu_caps,
              ff->ph->env.cpu_pmu_caps, (char *)"cpu");
 }
 
 static void print_pmu_caps(struct feat_fd *ff, FILE *fp)
 {
     struct pmu_caps *pmu_caps;
 
     for (int i = 0; i < ff->ph->env.nr_pmus_with_caps; i++) {
         pmu_caps = &ff->ph->env.pmu_caps[i];
         __print_pmu_caps(fp, pmu_caps->nr_caps, pmu_caps->caps,
                  pmu_caps->pmu_name);
     }
 }
 
 static void print_pmu_mappings(struct feat_fd *ff, FILE *fp)
 {
     const char *delimiter = "# pmu mappings: ";
     char *str, *tmp;
     u32 pmu_num;
     u32 type;
 
     pmu_num = ff->ph->env.nr_pmu_mappings;
     if (!pmu_num) {
         fprintf(fp, "# pmu mappings: not available\n");
         return;
     }
 
     str = ff->ph->env.pmu_mappings;
 
     while (pmu_num) {
         type = strtoul(str, &tmp, 0);
         if (*tmp != ':')
             goto error;
 
         str = tmp + 1;
         fprintf(fp, "%s%s = %" PRIu32, delimiter, str, type);
 
         delimiter = ", ";
         str += strlen(str) + 1;
         pmu_num--;
     }
 
     fprintf(fp, "\n");
 
     if (!pmu_num)
         return;
 error:
     fprintf(fp, "# pmu mappings: unable to read\n");
 }
 
 static void print_group_desc(struct feat_fd *ff, FILE *fp)
 {
     struct perf_session *session;
     struct evsel *evsel;
     u32 nr = 0;
 
     session = container_of(ff->ph, struct perf_session, header);
 
     evlist__for_each_entry(session->evlist, evsel) {
         if (evsel__is_group_leader(evsel) && evsel->core.nr_members > 1) {
             fprintf(fp, "# group: %s{%s", evsel->group_name ?: "", evsel__name(evsel));
 
             nr = evsel->core.nr_members - 1;
         } else if (nr) {
             fprintf(fp, ",%s", evsel__name(evsel));
 
             if (--nr == 0)
                 fprintf(fp, "}\n");
         }
     }
 }
 
 static void print_sample_time(struct feat_fd *ff, FILE *fp)
 {
     struct perf_session *session;
     char time_buf[32];
     double d;
 
     session = container_of(ff->ph, struct perf_session, header);
 
     timestamp__scnprintf_usec(session->evlist->first_sample_time,
                   time_buf, sizeof(time_buf));
     fprintf(fp, "# time of first sample : %s\n", time_buf);
 
     timestamp__scnprintf_usec(session->evlist->last_sample_time,
                   time_buf, sizeof(time_buf));
     fprintf(fp, "# time of last sample : %s\n", time_buf);
 
     d = (double)(session->evlist->last_sample_time -
         session->evlist->first_sample_time) / NSEC_PER_MSEC;
 
     fprintf(fp, "# sample duration : %10.3f ms\n", d);
 }
 
 static void memory_node__fprintf(struct memory_node *n,
                  unsigned long long bsize, FILE *fp)
 {
     char buf_map[100], buf_size[50];
     unsigned long long size;
 
     size = bsize * bitmap_weight(n->set, n->size);
     unit_number__scnprintf(buf_size, 50, size);
 
     bitmap_scnprintf(n->set, n->size, buf_map, 100);
     fprintf(fp, "#  %3" PRIu64 " [%s]: %s\n", n->node, buf_size, buf_map);
 }
 
 static void print_mem_topology(struct feat_fd *ff, FILE *fp)
 {
     struct memory_node *nodes;
     int i, nr;
 
     nodes = ff->ph->env.memory_nodes;
     nr    = ff->ph->env.nr_memory_nodes;
 
     fprintf(fp, "# memory nodes (nr %d, block size 0x%llx):\n",
         nr, ff->ph->env.memory_bsize);
 
     for (i = 0; i < nr; i++) {
         memory_node__fprintf(&nodes[i], ff->ph->env.memory_bsize, fp);
     }
 }
 
 static int __event_process_build_id(struct perf_record_header_build_id *bev,
                     char *filename,
                     struct perf_session *session)
 {
     int err = -1;
     struct machine *machine;
     u16 cpumode;
     struct dso *dso;
     enum dso_space_type dso_space;
 
     machine = perf_session__findnew_machine(session, bev->pid);
     if (!machine)
         goto out;
 
     cpumode = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 
     switch (cpumode) {
     case PERF_RECORD_MISC_KERNEL:
         dso_space = DSO_SPACE__KERNEL;
         break;
     case PERF_RECORD_MISC_GUEST_KERNEL:
         dso_space = DSO_SPACE__KERNEL_GUEST;
         break;
     case PERF_RECORD_MISC_USER:
     case PERF_RECORD_MISC_GUEST_USER:
         dso_space = DSO_SPACE__USER;
         break;
     default:
         goto out;
     }
 
     dso = machine__findnew_dso(machine, filename);
     if (dso != NULL) {
         char sbuild_id[SBUILD_ID_SIZE];
         struct build_id bid;
         size_t size = BUILD_ID_SIZE;
 
         if (bev->header.misc & PERF_RECORD_MISC_BUILD_ID_SIZE)
             size = bev->size;
 
         build_id__init(&bid, bev->data, size);
         dso__set_build_id(dso, &bid);
         dso->header_build_id = 1;
 
         if (dso_space != DSO_SPACE__USER) {
             struct kmod_path m = { .name = NULL, };
 
             if (!kmod_path__parse_name(&m, filename) && m.kmod)
                 dso__set_module_info(dso, &m, machine);
 
             dso->kernel = dso_space;
             free(m.name);
         }
 
         build_id__sprintf(&dso->bid, sbuild_id);
         pr_debug("build id event received for %s: %s [%zu]\n",
              dso->long_name, sbuild_id, size);
         dso__put(dso);
     }
 
     err = 0;
 out:
     return err;
 }
 
 static int perf_header__read_build_ids_abi_quirk(struct perf_header *header,
                          int input, u64 offset, u64 size)
 {
     struct perf_session *session = container_of(header, struct perf_session, header);
     struct {
         struct perf_event_header   header;
         u8             build_id[PERF_ALIGN(BUILD_ID_SIZE, sizeof(u64))];
         char               filename[0];
     } old_bev;
     struct perf_record_header_build_id bev;
     char filename[PATH_MAX];
     u64 limit = offset + size;
 
     while (offset < limit) {
         ssize_t len;
 
         if (readn(input, &old_bev, sizeof(old_bev)) != sizeof(old_bev))
             return -1;
 
         if (header->needs_swap)
             perf_event_header__bswap(&old_bev.header);
 
         len = old_bev.header.size - sizeof(old_bev);
         if (readn(input, filename, len) != len)
             return -1;
 
         bev.header = old_bev.header;
 
         /*
          * As the pid is the missing value, we need to fill
          * it properly. The header.misc value give us nice hint.
          */
         bev.pid = HOST_KERNEL_ID;
         if (bev.header.misc == PERF_RECORD_MISC_GUEST_USER ||
             bev.header.misc == PERF_RECORD_MISC_GUEST_KERNEL)
             bev.pid = DEFAULT_GUEST_KERNEL_ID;
 
         memcpy(bev.build_id, old_bev.build_id, sizeof(bev.build_id));
         __event_process_build_id(&bev, filename, session);
 
         offset += bev.header.size;
     }
 
     return 0;
 }
 
 static int perf_header__read_build_ids(struct perf_header *header,
                        int input, u64 offset, u64 size)
 {
     struct perf_session *session = container_of(header, struct perf_session, header);
     struct perf_record_header_build_id bev;
     char filename[PATH_MAX];
     u64 limit = offset + size, orig_offset = offset;
     int err = -1;
 
     while (offset < limit) {
         ssize_t len;
 
         if (readn(input, &bev, sizeof(bev)) != sizeof(bev))
             goto out;
 
         if (header->needs_swap)
             perf_event_header__bswap(&bev.header);
 
         len = bev.header.size - sizeof(bev);
         if (readn(input, filename, len) != len)
             goto out;
         /*
          * The a1645ce1 changeset:
          *
          * "perf: 'perf kvm' tool for monitoring guest performance from host"
          *
          * Added a field to struct perf_record_header_build_id that broke the file
          * format.
          *
          * Since the kernel build-id is the first entry, process the
          * table using the old format if the well known
          * '[kernel.kallsyms]' string for the kernel build-id has the
          * first 4 characters chopped off (where the pid_t sits).
          */
         if (memcmp(filename, "nel.kallsyms]", 13) == 0) {
             if (lseek(input, orig_offset, SEEK_SET) == (off_t)-1)
                 return -1;
             return perf_header__read_build_ids_abi_quirk(header, input, offset, size);
         }
 
         __event_process_build_id(&bev, filename, session);
 
         offset += bev.header.size;
     }
     err = 0;
 out:
     return err;
 }
 
 /* Macro for features that simply need to read and store a string. */
 #define FEAT_PROCESS_STR_FUN(__feat, __feat_env) \
 static int process_##__feat(struct feat_fd *ff, void *data __maybe_unused) \
 {\
     free(ff->ph->env.__feat_env);            \
     ff->ph->env.__feat_env = do_read_string(ff); \
     return ff->ph->env.__feat_env ? 0 : -ENOMEM; \
 }
 
 FEAT_PROCESS_STR_FUN(hostname, hostname);
 FEAT_PROCESS_STR_FUN(osrelease, os_release);
 FEAT_PROCESS_STR_FUN(version, version);
 FEAT_PROCESS_STR_FUN(arch, arch);
 FEAT_PROCESS_STR_FUN(cpudesc, cpu_desc);
 FEAT_PROCESS_STR_FUN(cpuid, cpuid);
 
 static int process_tracing_data(struct feat_fd *ff, void *data)
 {
     ssize_t ret = trace_report(ff->fd, data, false);
 
     return ret < 0 ? -1 : 0;
 }
 
 static int process_build_id(struct feat_fd *ff, void *data __maybe_unused)
 {
     if (perf_header__read_build_ids(ff->ph, ff->fd, ff->offset, ff->size))
         pr_debug("Failed to read buildids, continuing...\n");
     return 0;
 }
 
 static int process_nrcpus(struct feat_fd *ff, void *data __maybe_unused)
 {
     int ret;
     u32 nr_cpus_avail, nr_cpus_online;
 
     ret = do_read_u32(ff, &nr_cpus_avail);
     if (ret)
         return ret;
 
     ret = do_read_u32(ff, &nr_cpus_online);
     if (ret)
         return ret;
     ff->ph->env.nr_cpus_avail = (int)nr_cpus_avail;
     ff->ph->env.nr_cpus_online = (int)nr_cpus_online;
     return 0;
 }
 
 static int process_total_mem(struct feat_fd *ff, void *data __maybe_unused)
 {
     u64 total_mem;
     int ret;
 
     ret = do_read_u64(ff, &total_mem);
     if (ret)
         return -1;
     ff->ph->env.total_mem = (unsigned long long)total_mem;
     return 0;
 }
 
 static struct evsel *evlist__find_by_index(struct evlist *evlist, int idx)
 {
     struct evsel *evsel;
 
     evlist__for_each_entry(evlist, evsel) {
         if (evsel->core.idx == idx)
             return evsel;
     }
 
     return NULL;
 }
 
 static void evlist__set_event_name(struct evlist *evlist, struct evsel *event)
 {
     struct evsel *evsel;
 
     if (!event->name)
         return;
 
     evsel = evlist__find_by_index(evlist, event->core.idx);
     if (!evsel)
         return;
 
     if (evsel->name)
         return;
 
     evsel->name = strdup(event->name);
 }
 
 static int
 process_event_desc(struct feat_fd *ff, void *data __maybe_unused)
 {
     struct perf_session *session;
     struct evsel *evsel, *events = read_event_desc(ff);
 
     if (!events)
         return 0;
 
     session = container_of(ff->ph, struct perf_session, header);
 
     if (session->data->is_pipe) {
         /* Save events for reading later by print_event_desc,
          * since they can't be read again in pipe mode. */
         ff->events = events;
     }
 
     for (evsel = events; evsel->core.attr.size; evsel++)
         evlist__set_event_name(session->evlist, evsel);
 
     if (!session->data->is_pipe)
         free_event_desc(events);
 
     return 0;
 }
 
 static int process_cmdline(struct feat_fd *ff, void *data __maybe_unused)
 {
     char *str, *cmdline = NULL, **argv = NULL;
     u32 nr, i, len = 0;
 
     if (do_read_u32(ff, &nr))
         return -1;
 
     ff->ph->env.nr_cmdline = nr;
 
     cmdline = zalloc(ff->size + nr + 1);
     if (!cmdline)
         return -1;
 
     argv = zalloc(sizeof(char *) * (nr + 1));
     if (!argv)
         goto error;
 
     for (i = 0; i < nr; i++) {
         str = do_read_string(ff);
         if (!str)
             goto error;
 
         argv[i] = cmdline + len;
         memcpy(argv[i], str, strlen(str) + 1);
         len += strlen(str) + 1;
         free(str);
     }
     ff->ph->env.cmdline = cmdline;
     ff->ph->env.cmdline_argv = (const char **) argv;
     return 0;
 
 error:
     free(argv);
     free(cmdline);
     return -1;
 }
 
 static int process_cpu_topology(struct feat_fd *ff, void *data __maybe_unused)
 {
     u32 nr, i;
     char *str;
     struct strbuf sb;
     int cpu_nr = ff->ph->env.nr_cpus_avail;
     u64 size = 0;
     struct perf_header *ph = ff->ph;
     bool do_core_id_test = true;
 
     ph->env.cpu = calloc(cpu_nr, sizeof(*ph->env.cpu));
     if (!ph->env.cpu)
         return -1;
 
     if (do_read_u32(ff, &nr))
         goto free_cpu;
 
     ph->env.nr_sibling_cores = nr;
     size += sizeof(u32);
     if (strbuf_init(&sb, 128) < 0)
         goto free_cpu;
 
     for (i = 0; i < nr; i++) {
         str = do_read_string(ff);
         if (!str)
             goto error;
 
         /* include a NULL character at the end */
         if (strbuf_add(&sb, str, strlen(str) + 1) < 0)
             goto error;
         size += string_size(str);
         free(str);
     }
     ph->env.sibling_cores = strbuf_detach(&sb, NULL);
 
     if (do_read_u32(ff, &nr))
         return -1;
 
     ph->env.nr_sibling_threads = nr;
     size += sizeof(u32);
 
     for (i = 0; i < nr; i++) {
         str = do_read_string(ff);
         if (!str)
             goto error;
 
         /* include a NULL character at the end */
         if (strbuf_add(&sb, str, strlen(str) + 1) < 0)
             goto error;
         size += string_size(str);
         free(str);
     }
     ph->env.sibling_threads = strbuf_detach(&sb, NULL);
 
     /*
      * The header may be from old perf,
      * which doesn't include core id and socket id information.
      */
     if (ff->size <= size) {
         zfree(&ph->env.cpu);
         return 0;
     }
 
     /* On s390 the socket_id number is not related to the numbers of cpus.
      * The socket_id number might be higher than the numbers of cpus.
      * This depends on the configuration.
      * AArch64 is the same.
      */
     if (ph->env.arch && (!strncmp(ph->env.arch, "s390", 4)
               || !strncmp(ph->env.arch, "aarch64", 7)))
         do_core_id_test = false;
 
     for (i = 0; i < (u32)cpu_nr; i++) {
         if (do_read_u32(ff, &nr))
             goto free_cpu;
 
         ph->env.cpu[i].core_id = nr;
         size += sizeof(u32);
 
         if (do_read_u32(ff, &nr))
             goto free_cpu;
 
         if (do_core_id_test && nr != (u32)-1 && nr > (u32)cpu_nr) {
             pr_debug("socket_id number is too big."
                  "You may need to upgrade the perf tool.\n");
             goto free_cpu;
         }
 
         ph->env.cpu[i].socket_id = nr;
         size += sizeof(u32);
     }
 
     /*
      * The header may be from old perf,
      * which doesn't include die information.
      */
     if (ff->size <= size)
         return 0;
 
     if (do_read_u32(ff, &nr))
         return -1;
 
     ph->env.nr_sibling_dies = nr;
     size += sizeof(u32);
 
     for (i = 0; i < nr; i++) {
         str = do_read_string(ff);
         if (!str)
             goto error;
 
         /* include a NULL character at the end */
         if (strbuf_add(&sb, str, strlen(str) + 1) < 0)
             goto error;
         size += string_size(str);
         free(str);
     }
     ph->env.sibling_dies = strbuf_detach(&sb, NULL);
 
     for (i = 0; i < (u32)cpu_nr; i++) {
         if (do_read_u32(ff, &nr))
             goto free_cpu;
 
         ph->env.cpu[i].die_id = nr;
     }
 
     return 0;
 
 error:
     strbuf_release(&sb);
 free_cpu:
     zfree(&ph->env.cpu);
     return -1;
 }
 
 static int process_numa_topology(struct feat_fd *ff, void *data __maybe_unused)
 {
     struct numa_node *nodes, *n;
     u32 nr, i;
     char *str;
 
     /* nr nodes */
     if (do_read_u32(ff, &nr))
         return -1;
 
     nodes = zalloc(sizeof(*nodes) * nr);
     if (!nodes)
         return -ENOMEM;
 
     for (i = 0; i < nr; i++) {
         n = &nodes[i];
 
         /* node number */
         if (do_read_u32(ff, &n->node))
             goto error;
 
         if (do_read_u64(ff, &n->mem_total))
             goto error;
 
         if (do_read_u64(ff, &n->mem_free))
             goto error;
 
         str = do_read_string(ff);
         if (!str)
             goto error;
 
         n->map = perf_cpu_map__new(str);
         if (!n->map)
             goto error;
 
         free(str);
     }
     ff->ph->env.nr_numa_nodes = nr;
     ff->ph->env.numa_nodes = nodes;
     return 0;
 
 error:
     free(nodes);
     return -1;
 }
 
 static int process_pmu_mappings(struct feat_fd *ff, void *data __maybe_unused)
 {
     char *name;
     u32 pmu_num;
     u32 type;
     struct strbuf sb;
 
     if (do_read_u32(ff, &pmu_num))
         return -1;
 
     if (!pmu_num) {
         pr_debug("pmu mappings not available\n");
         return 0;
     }
 
     ff->ph->env.nr_pmu_mappings = pmu_num;
     if (strbuf_init(&sb, 128) < 0)
         return -1;
 
     while (pmu_num) {
         if (do_read_u32(ff, &type))
             goto error;
 
         name = do_read_string(ff);
         if (!name)
             goto error;
 
         if (strbuf_addf(&sb, "%u:%s", type, name) < 0)
             goto error;
         /* include a NULL character at the end */
         if (strbuf_add(&sb, "", 1) < 0)
             goto error;
 
         if (!strcmp(name, "msr"))
             ff->ph->env.msr_pmu_type = type;
 
         free(name);
         pmu_num--;
     }
     ff->ph->env.pmu_mappings = strbuf_detach(&sb, NULL);
     return 0;
 
 error:
     strbuf_release(&sb);
     return -1;
 }
 
 static int process_group_desc(struct feat_fd *ff, void *data __maybe_unused)
 {
     size_t ret = -1;
     u32 i, nr, nr_groups;
     struct perf_session *session;
     struct evsel *evsel, *leader = NULL;
     struct group_desc {
         char *name;
         u32 leader_idx;
         u32 nr_members;
     } *desc;
 
     if (do_read_u32(ff, &nr_groups))
         return -1;
 
     ff->ph->env.nr_groups = nr_groups;
     if (!nr_groups) {
         pr_debug("group desc not available\n");
         return 0;
     }
 
     desc = calloc(nr_groups, sizeof(*desc));
     if (!desc)
         return -1;
 
     for (i = 0; i < nr_groups; i++) {
         desc[i].name = do_read_string(ff);
         if (!desc[i].name)
             goto out_free;
 
         if (do_read_u32(ff, &desc[i].leader_idx))
             goto out_free;
 
         if (do_read_u32(ff, &desc[i].nr_members))
             goto out_free;
     }
 
     /*
      * Rebuild group relationship based on the group_desc
      */
     session = container_of(ff->ph, struct perf_session, header);
     session->evlist->core.nr_groups = nr_groups;
 
     i = nr = 0;
     evlist__for_each_entry(session->evlist, evsel) {
         if (evsel->core.idx == (int) desc[i].leader_idx) {
             evsel__set_leader(evsel, evsel);
             /* {anon_group} is a dummy name */
             if (strcmp(desc[i].name, "{anon_group}")) {
                 evsel->group_name = desc[i].name;
                 desc[i].name = NULL;
             }
             evsel->core.nr_members = desc[i].nr_members;
 
             if (i >= nr_groups || nr > 0) {
                 pr_debug("invalid group desc\n");
                 goto out_free;
             }
 
             leader = evsel;
             nr = evsel->core.nr_members - 1;
             i++;
         } else if (nr) {
             /* This is a group member */
             evsel__set_leader(evsel, leader);
 
             nr--;
         }
     }
 
     if (i != nr_groups || nr != 0) {
         pr_debug("invalid group desc\n");
         goto out_free;
     }
 
     ret = 0;
 out_free:
     for (i = 0; i < nr_groups; i++)
         zfree(&desc[i].name);
     free(desc);
 
     return ret;
 }
 
 static int process_auxtrace(struct feat_fd *ff, void *data __maybe_unused)
 {
     struct perf_session *session;
     int err;
 
     session = container_of(ff->ph, struct perf_session, header);
 
     err = auxtrace_index__process(ff->fd, ff->size, session,
                       ff->ph->needs_swap);
     if (err < 0)
         pr_err("Failed to process auxtrace index\n");
     return err;
 }
 
 static int process_cache(struct feat_fd *ff, void *data __maybe_unused)
 {
     struct cpu_cache_level *caches;
     u32 cnt, i, version;
 
     if (do_read_u32(ff, &version))
         return -1;
 
     if (version != 1)
         return -1;
 
     if (do_read_u32(ff, &cnt))
         return -1;
 
     caches = zalloc(sizeof(*caches) * cnt);
     if (!caches)
         return -1;
 
     for (i = 0; i < cnt; i++) {
         struct cpu_cache_level c;
 
         #define _R(v)                       \
             if (do_read_u32(ff, &c.v))\
                 goto out_free_caches;           \
 
         _R(level)
         _R(line_size)
         _R(sets)
         _R(ways)
         #undef _R
 
         #define _R(v)                   \
             c.v = do_read_string(ff);       \
             if (!c.v)               \
                 goto out_free_caches;
 
         _R(type)
         _R(size)
         _R(map)
         #undef _R
 
         caches[i] = c;
     }
 
     ff->ph->env.caches = caches;
     ff->ph->env.caches_cnt = cnt;
     return 0;
 out_free_caches:
     free(caches);
     return -1;
 }
 
 static int process_sample_time(struct feat_fd *ff, void *data __maybe_unused)
 {
     struct perf_session *session;
     u64 first_sample_time, last_sample_time;
     int ret;
 
     session = container_of(ff->ph, struct perf_session, header);
 
     ret = do_read_u64(ff, &first_sample_time);
     if (ret)
         return -1;
 
     ret = do_read_u64(ff, &last_sample_time);
     if (ret)
         return -1;
 
     session->evlist->first_sample_time = first_sample_time;
     session->evlist->last_sample_time = last_sample_time;
     return 0;
 }
 
 static int process_mem_topology(struct feat_fd *ff,
                 void *data __maybe_unused)
 {
     struct memory_node *nodes;
     u64 version, i, nr, bsize;
     int ret = -1;
 
     if (do_read_u64(ff, &version))
         return -1;
 
     if (version != 1)
         return -1;
 
     if (do_read_u64(ff, &bsize))
         return -1;
 
     if (do_read_u64(ff, &nr))
         return -1;
 
     nodes = zalloc(sizeof(*nodes) * nr);
     if (!nodes)
         return -1;
 
     for (i = 0; i < nr; i++) {
         struct memory_node n;
 
         #define _R(v)               \
             if (do_read_u64(ff, &n.v))  \
                 goto out;       \
 
         _R(node)
         _R(size)
 
         #undef _R
 
         if (do_read_bitmap(ff, &n.set, &n.size))
             goto out;
 
         nodes[i] = n;
     }
 
     ff->ph->env.memory_bsize    = bsize;
     ff->ph->env.memory_nodes    = nodes;
     ff->ph->env.nr_memory_nodes = nr;
     ret = 0;
 
 out:
     if (ret)
         free(nodes);
     return ret;
 }
 
 static int process_clockid(struct feat_fd *ff,
                void *data __maybe_unused)
 {
     if (do_read_u64(ff, &ff->ph->env.clock.clockid_res_ns))
         return -1;
 
     return 0;
 }
 
 static int process_clock_data(struct feat_fd *ff,
                   void *_data __maybe_unused)
 {
     u32 data32;
     u64 data64;
 
     /* version */
     if (do_read_u32(ff, &data32))
         return -1;
 
     if (data32 != 1)
         return -1;
 
     /* clockid */
     if (do_read_u32(ff, &data32))
         return -1;
 
     ff->ph->env.clock.clockid = data32;
 
     /* TOD ref time */
     if (do_read_u64(ff, &data64))
         return -1;
 
     ff->ph->env.clock.tod_ns = data64;
 
     /* clockid ref time */
     if (do_read_u64(ff, &data64))
         return -1;
 
     ff->ph->env.clock.clockid_ns = data64;
     ff->ph->env.clock.enabled = true;
     return 0;
 }
 
 static int process_hybrid_topology(struct feat_fd *ff,
                    void *data __maybe_unused)
 {
     struct hybrid_node *nodes, *n;
     u32 nr, i;
 
     /* nr nodes */
     if (do_read_u32(ff, &nr))
         return -1;
 
     nodes = zalloc(sizeof(*nodes) * nr);
     if (!nodes)
         return -ENOMEM;
 
     for (i = 0; i < nr; i++) {
         n = &nodes[i];
 
         n->pmu_name = do_read_string(ff);
         if (!n->pmu_name)
             goto error;
 
         n->cpus = do_read_string(ff);
         if (!n->cpus)
             goto error;
     }
 
     ff->ph->env.nr_hybrid_nodes = nr;
     ff->ph->env.hybrid_nodes = nodes;
     return 0;
 
 error:
     for (i = 0; i < nr; i++) {
         free(nodes[i].pmu_name);
         free(nodes[i].cpus);
     }
 
     free(nodes);
     return -1;
 }
 
 static int process_dir_format(struct feat_fd *ff,
                   void *_data __maybe_unused)
 {
     struct perf_session *session;
     struct perf_data *data;
 
     session = container_of(ff->ph, struct perf_session, header);
     data = session->data;
 
     if (WARN_ON(!perf_data__is_dir(data)))
         return -1;
 
     return do_read_u64(ff, &data->dir.version);
 }
 
 #ifdef HAVE_LIBBPF_SUPPORT
 static int process_bpf_prog_info(struct feat_fd *ff, void *data __maybe_unused)
 {
     struct bpf_prog_info_node *info_node;
     struct perf_env *env = &ff->ph->env;
     struct perf_bpil *info_linear;
     u32 count, i;
     int err = -1;
 
     if (ff->ph->needs_swap) {
         pr_warning("interpreting bpf_prog_info from systems with endianness is not yet supported\n");
         return 0;
     }
 
     if (do_read_u32(ff, &count))
         return -1;
 
     down_write(&env->bpf_progs.lock);
 
     for (i = 0; i < count; ++i) {
         u32 info_len, data_len;
 
         info_linear = NULL;
         info_node = NULL;
         if (do_read_u32(ff, &info_len))
             goto out;
         if (do_read_u32(ff, &data_len))
             goto out;
 
         if (info_len > sizeof(struct bpf_prog_info)) {
             pr_warning("detected invalid bpf_prog_info\n");
             goto out;
         }
 
         info_linear = malloc(sizeof(struct perf_bpil) +
                      data_len);
         if (!info_linear)
             goto out;
         info_linear->info_len = sizeof(struct bpf_prog_info);
         info_linear->data_len = data_len;
         if (do_read_u64(ff, (u64 *)(&info_linear->arrays)))
             goto out;
         if (__do_read(ff, &info_linear->info, info_len))
             goto out;
         if (info_len < sizeof(struct bpf_prog_info))
             memset(((void *)(&info_linear->info)) + info_len, 0,
                    sizeof(struct bpf_prog_info) - info_len);
 
         if (__do_read(ff, info_linear->data, data_len))
             goto out;
 
         info_node = malloc(sizeof(struct bpf_prog_info_node));
         if (!info_node)
             goto out;
 
         /* after reading from file, translate offset to address */
         bpil_offs_to_addr(info_linear);
         info_node->info_linear = info_linear;
         perf_env__insert_bpf_prog_info(env, info_node);
     }
 
     up_write(&env->bpf_progs.lock);
     return 0;
 out:
     free(info_linear);
     free(info_node);
     up_write(&env->bpf_progs.lock);
     return err;
 }
 
 static int process_bpf_btf(struct feat_fd *ff, void *data __maybe_unused)
 {
     struct perf_env *env = &ff->ph->env;
     struct btf_node *node = NULL;
     u32 count, i;
     int err = -1;
 
     if (ff->ph->needs_swap) {
         pr_warning("interpreting btf from systems with endianness is not yet supported\n");
         return 0;
     }
 
     if (do_read_u32(ff, &count))
         return -1;
 
     down_write(&env->bpf_progs.lock);
 
     for (i = 0; i < count; ++i) {
         u32 id, data_size;
 
         if (do_read_u32(ff, &id))
             goto out;
         if (do_read_u32(ff, &data_size))
             goto out;
 
         node = malloc(sizeof(struct btf_node) + data_size);
         if (!node)
             goto out;
 
         node->id = id;
         node->data_size = data_size;
 
         if (__do_read(ff, node->data, data_size))
             goto out;
 
         perf_env__insert_btf(env, node);
         node = NULL;
     }
 
     err = 0;
 out:
     up_write(&env->bpf_progs.lock);
     free(node);
     return err;
 }
 #endif // HAVE_LIBBPF_SUPPORT
 
 static int process_compressed(struct feat_fd *ff,
                   void *data __maybe_unused)
 {
     if (do_read_u32(ff, &(ff->ph->env.comp_ver)))
         return -1;
 
     if (do_read_u32(ff, &(ff->ph->env.comp_type)))
         return -1;
 
     if (do_read_u32(ff, &(ff->ph->env.comp_level)))
         return -1;
 
     if (do_read_u32(ff, &(ff->ph->env.comp_ratio)))
         return -1;
 
     if (do_read_u32(ff, &(ff->ph->env.comp_mmap_len)))
         return -1;
 
     return 0;
 }
 
 static int __process_pmu_caps(struct feat_fd *ff, int *nr_caps,
                   char ***caps, unsigned int *max_branches)
 {
     char *name, *value, *ptr;
     u32 nr_pmu_caps, i;
 
     *nr_caps = 0;
     *caps = NULL;
 
     if (do_read_u32(ff, &nr_pmu_caps))
         return -1;
 
     if (!nr_pmu_caps)
         return 0;
 
     *caps = zalloc(sizeof(char *) * nr_pmu_caps);
     if (!*caps)
         return -1;
 
     for (i = 0; i < nr_pmu_caps; i++) {
         name = do_read_string(ff);
         if (!name)
             goto error;
 
         value = do_read_string(ff);
         if (!value)
             goto free_name;
 
         if (asprintf(&ptr, "%s=%s", name, value) < 0)
             goto free_value;
 
         (*caps)[i] = ptr;
 
         if (!strcmp(name, "branches"))
             *max_branches = atoi(value);
 
         free(value);
         free(name);
     }
     *nr_caps = nr_pmu_caps;
     return 0;
 
 free_value:
     free(value);
 free_name:
     free(name);
 error:
     for (; i > 0; i--)
         free((*caps)[i - 1]);
     free(*caps);
     *caps = NULL;
     *nr_caps = 0;
     return -1;
 }
 
 static int process_cpu_pmu_caps(struct feat_fd *ff,
                 void *data __maybe_unused)
 {
     int ret = __process_pmu_caps(ff, &ff->ph->env.nr_cpu_pmu_caps,
                      &ff->ph->env.cpu_pmu_caps,
                      &ff->ph->env.max_branches);
 
     if (!ret && !ff->ph->env.cpu_pmu_caps)
         pr_debug("cpu pmu capabilities not available\n");
     return ret;
 }
 
 static int process_pmu_caps(struct feat_fd *ff, void *data __maybe_unused)
 {
     struct pmu_caps *pmu_caps;
     u32 nr_pmu, i;
     int ret;
     int j;
 
     if (do_read_u32(ff, &nr_pmu))
         return -1;
 
     if (!nr_pmu) {
         pr_debug("pmu capabilities not available\n");
         return 0;
     }
 
     pmu_caps = zalloc(sizeof(*pmu_caps) * nr_pmu);
     if (!pmu_caps)
         return -ENOMEM;
 
     for (i = 0; i < nr_pmu; i++) {
         ret = __process_pmu_caps(ff, &pmu_caps[i].nr_caps,
                      &pmu_caps[i].caps,
                      &pmu_caps[i].max_branches);
         if (ret)
             goto err;
 
         pmu_caps[i].pmu_name = do_read_string(ff);
         if (!pmu_caps[i].pmu_name) {
             ret = -1;
             goto err;
         }
         if (!pmu_caps[i].nr_caps) {
             pr_debug("%s pmu capabilities not available\n",
                  pmu_caps[i].pmu_name);
         }
     }
 
     ff->ph->env.nr_pmus_with_caps = nr_pmu;
     ff->ph->env.pmu_caps = pmu_caps;
     return 0;
 
 err:
     for (i = 0; i < nr_pmu; i++) {
         for (j = 0; j < pmu_caps[i].nr_caps; j++)
             free(pmu_caps[i].caps[j]);
         free(pmu_caps[i].caps);
         free(pmu_caps[i].pmu_name);
     }
 
     free(pmu_caps);
     return ret;
 }
 
 #define FEAT_OPR(n, func, __full_only) \
     [HEADER_##n] = {                    \
         .name       = __stringify(n),           \
         .write      = write_##func,         \
         .print      = print_##func,         \
         .full_only  = __full_only,          \
         .process    = process_##func,           \
         .synthesize = true              \
     }
 
 #define FEAT_OPN(n, func, __full_only) \
     [HEADER_##n] = {                    \
         .name       = __stringify(n),           \
         .write      = write_##func,         \
         .print      = print_##func,         \
         .full_only  = __full_only,          \
         .process    = process_##func            \
     }
 
 /* feature_ops not implemented: */
 #define print_tracing_data  NULL
 #define print_build_id      NULL
 
 #define process_branch_stack    NULL
 #define process_stat        NULL
 
 // Only used in util/synthetic-events.c
 const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE];
 
 const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE] = {
     FEAT_OPN(TRACING_DATA,  tracing_data,   false),
     FEAT_OPN(BUILD_ID,  build_id,   false),
     FEAT_OPR(HOSTNAME,  hostname,   false),
     FEAT_OPR(OSRELEASE, osrelease,  false),
     FEAT_OPR(VERSION,   version,    false),
     FEAT_OPR(ARCH,      arch,       false),
     FEAT_OPR(NRCPUS,    nrcpus,     false),
     FEAT_OPR(CPUDESC,   cpudesc,    false),
     FEAT_OPR(CPUID,     cpuid,      false),
     FEAT_OPR(TOTAL_MEM, total_mem,  false),
     FEAT_OPR(EVENT_DESC,    event_desc, false),
     FEAT_OPR(CMDLINE,   cmdline,    false),
     FEAT_OPR(CPU_TOPOLOGY,  cpu_topology,   true),
     FEAT_OPR(NUMA_TOPOLOGY, numa_topology,  true),
     FEAT_OPN(BRANCH_STACK,  branch_stack,   false),
     FEAT_OPR(PMU_MAPPINGS,  pmu_mappings,   false),
     FEAT_OPR(GROUP_DESC,    group_desc, false),
     FEAT_OPN(AUXTRACE,  auxtrace,   false),
     FEAT_OPN(STAT,      stat,       false),
     FEAT_OPN(CACHE,     cache,      true),
     FEAT_OPR(SAMPLE_TIME,   sample_time,    false),
     FEAT_OPR(MEM_TOPOLOGY,  mem_topology,   true),
     FEAT_OPR(CLOCKID,   clockid,    false),
     FEAT_OPN(DIR_FORMAT,    dir_format, false),
 #ifdef HAVE_LIBBPF_SUPPORT
     FEAT_OPR(BPF_PROG_INFO, bpf_prog_info,  false),
     FEAT_OPR(BPF_BTF,       bpf_btf,        false),
 #endif
     FEAT_OPR(COMPRESSED,    compressed, false),
     FEAT_OPR(CPU_PMU_CAPS,  cpu_pmu_caps,   false),
     FEAT_OPR(CLOCK_DATA,    clock_data, false),
     FEAT_OPN(HYBRID_TOPOLOGY,   hybrid_topology,    true),
     FEAT_OPR(PMU_CAPS,  pmu_caps,   false),
 };
 
 struct header_print_data {
     FILE *fp;
     bool full; /* extended list of headers */
 };
 
 static int perf_file_section__fprintf_info(struct perf_file_section *section,
                        struct perf_header *ph,
                        int feat, int fd, void *data)
 {
     struct header_print_data *hd = data;
     struct feat_fd ff;
 
     if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
         pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
                 "%d, continuing...\n", section->offset, feat);
         return 0;
     }
     if (feat >= HEADER_LAST_FEATURE) {
         pr_warning("unknown feature %d\n", feat);
         return 0;
     }
     if (!feat_ops[feat].print)
         return 0;
 
     ff = (struct  feat_fd) {
         .fd = fd,
         .ph = ph,
     };
 
     if (!feat_ops[feat].full_only || hd->full)
         feat_ops[feat].print(&ff, hd->fp);
     else
         fprintf(hd->fp, "# %s info available, use -I to display\n",
             feat_ops[feat].name);
 
     return 0;
 }
 
 int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
 {
     struct header_print_data hd;
     struct perf_header *header = &session->header;
     int fd = perf_data__fd(session->data);
     struct stat st;
     time_t stctime;
     int ret, bit;
 
     hd.fp = fp;
     hd.full = full;
 
     ret = fstat(fd, &st);
     if (ret == -1)
         return -1;
 
     stctime = st.st_mtime;
     fprintf(fp, "# captured on    : %s", ctime(&stctime));
 
     fprintf(fp, "# header version : %u\n", header->version);
     fprintf(fp, "# data offset    : %" PRIu64 "\n", header->data_offset);
     fprintf(fp, "# data size      : %" PRIu64 "\n", header->data_size);
     fprintf(fp, "# feat offset    : %" PRIu64 "\n", header->feat_offset);
 
     perf_header__process_sections(header, fd, &hd,
                       perf_file_section__fprintf_info);
 
     if (session->data->is_pipe)
         return 0;
 
     fprintf(fp, "# missing features: ");
     for_each_clear_bit(bit, header->adds_features, HEADER_LAST_FEATURE) {
         if (bit)
             fprintf(fp, "%s ", feat_ops[bit].name);
     }
 
     fprintf(fp, "\n");
     return 0;
 }
 
 struct header_fw {
     struct feat_writer  fw;
     struct feat_fd      *ff;
 };
 
 static int feat_writer_cb(struct feat_writer *fw, void *buf, size_t sz)
 {
     struct header_fw *h = container_of(fw, struct header_fw, fw);
 
     return do_write(h->ff, buf, sz);
 }
 
 static int do_write_feat(struct feat_fd *ff, int type,
              struct perf_file_section **p,
              struct evlist *evlist,
              struct feat_copier *fc)
 {
     int err;
     int ret = 0;
 
     if (perf_header__has_feat(ff->ph, type)) {
         if (!feat_ops[type].write)
             return -1;
 
         if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))
             return -1;
 
         (*p)->offset = lseek(ff->fd, 0, SEEK_CUR);
 
         /*
          * Hook to let perf inject copy features sections from the input
          * file.
          */
         if (fc && fc->copy) {
             struct header_fw h = {
                 .fw.write = feat_writer_cb,
                 .ff = ff,
             };
 
             /* ->copy() returns 0 if the feature was not copied */
             err = fc->copy(fc, type, &h.fw);
         } else {
             err = 0;
         }
         if (!err)
             err = feat_ops[type].write(ff, evlist);
         if (err < 0) {
             pr_debug("failed to write feature %s\n", feat_ops[type].name);
 
             /* undo anything written */
             lseek(ff->fd, (*p)->offset, SEEK_SET);
 
             return -1;
         }
         (*p)->size = lseek(ff->fd, 0, SEEK_CUR) - (*p)->offset;
         (*p)++;
     }
     return ret;
 }
 
 static int perf_header__adds_write(struct perf_header *header,
                    struct evlist *evlist, int fd,
                    struct feat_copier *fc)
 {
     int nr_sections;
     struct feat_fd ff;
     struct perf_file_section *feat_sec, *p;
     int sec_size;
     u64 sec_start;
     int feat;
     int err;
 
     ff = (struct feat_fd){
         .fd  = fd,
         .ph = header,
     };
 
     nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
     if (!nr_sections)
         return 0;
 
     feat_sec = p = calloc(nr_sections, sizeof(*feat_sec));
     if (feat_sec == NULL)
         return -ENOMEM;
 
     sec_size = sizeof(*feat_sec) * nr_sections;
 
     sec_start = header->feat_offset;
     lseek(fd, sec_start + sec_size, SEEK_SET);
 
     for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
         if (do_write_feat(&ff, feat, &p, evlist, fc))
             perf_header__clear_feat(header, feat);
     }
 
     lseek(fd, sec_start, SEEK_SET);
     /*
      * may write more than needed due to dropped feature, but
      * this is okay, reader will skip the missing entries
      */
     err = do_write(&ff, feat_sec, sec_size);
     if (err < 0)
         pr_debug("failed to write feature section\n");
     free(feat_sec);
     return err;
 }
 
 int perf_header__write_pipe(int fd)
 {
     struct perf_pipe_file_header f_header;
     struct feat_fd ff;
     int err;
 
     ff = (struct feat_fd){ .fd = fd };
 
     f_header = (struct perf_pipe_file_header){
         .magic     = PERF_MAGIC,
         .size      = sizeof(f_header),
     };
 
     err = do_write(&ff, &f_header, sizeof(f_header));
     if (err < 0) {
         pr_debug("failed to write perf pipe header\n");
         return err;
     }
 
     return 0;
 }
 
 static int perf_session__do_write_header(struct perf_session *session,
                      struct evlist *evlist,
                      int fd, bool at_exit,
                      struct feat_copier *fc)
 {
     struct perf_file_header f_header;
     struct perf_file_attr   f_attr;
     struct perf_header *header = &session->header;
     struct evsel *evsel;
     struct feat_fd ff;
     u64 attr_offset;
     int err;
 
     ff = (struct feat_fd){ .fd = fd};
     lseek(fd, sizeof(f_header), SEEK_SET);
 
     evlist__for_each_entry(session->evlist, evsel) {
         evsel->id_offset = lseek(fd, 0, SEEK_CUR);
         err = do_write(&ff, evsel->core.id, evsel->core.ids * sizeof(u64));
         if (err < 0) {
             pr_debug("failed to write perf header\n");
             return err;
         }
     }
 
     attr_offset = lseek(ff.fd, 0, SEEK_CUR);
 
     evlist__for_each_entry(evlist, evsel) {
         if (evsel->core.attr.size < sizeof(evsel->core.attr)) {
             /*
              * We are likely in "perf inject" and have read
              * from an older file. Update attr size so that
              * reader gets the right offset to the ids.
              */
             evsel->core.attr.size = sizeof(evsel->core.attr);
         }
         f_attr = (struct perf_file_attr){
             .attr = evsel->core.attr,
             .ids  = {
                 .offset = evsel->id_offset,
                 .size   = evsel->core.ids * sizeof(u64),
             }
         };
         err = do_write(&ff, &f_attr, sizeof(f_attr));
         if (err < 0) {
             pr_debug("failed to write perf header attribute\n");
             return err;
         }
     }
 
     if (!header->data_offset)
         header->data_offset = lseek(fd, 0, SEEK_CUR);
     header->feat_offset = header->data_offset + header->data_size;
 
     if (at_exit) {
         err = perf_header__adds_write(header, evlist, fd, fc);
         if (err < 0)
             return err;
     }
 
     f_header = (struct perf_file_header){
         .magic     = PERF_MAGIC,
         .size      = sizeof(f_header),
         .attr_size = sizeof(f_attr),
         .attrs = {
             .offset = attr_offset,
             .size   = evlist->core.nr_entries * sizeof(f_attr),
         },
         .data = {
             .offset = header->data_offset,
             .size   = header->data_size,
         },
         /* event_types is ignored, store zeros */
     };
 
     memcpy(&f_header.adds_features, &header->adds_features, sizeof(header->adds_features));
 
     lseek(fd, 0, SEEK_SET);
     err = do_write(&ff, &f_header, sizeof(f_header));
     if (err < 0) {
         pr_debug("failed to write perf header\n");
         return err;
     }
     lseek(fd, header->data_offset + header->data_size, SEEK_SET);
 
     return 0;
 }
 
 int perf_session__write_header(struct perf_session *session,
                    struct evlist *evlist,
                    int fd, bool at_exit)
 {
     return perf_session__do_write_header(session, evlist, fd, at_exit, NULL);
 }
 
 size_t perf_session__data_offset(const struct evlist *evlist)
 {
     struct evsel *evsel;
     size_t data_offset;
 
     data_offset = sizeof(struct perf_file_header);
     evlist__for_each_entry(evlist, evsel) {
         data_offset += evsel->core.ids * sizeof(u64);
     }
     data_offset += evlist->core.nr_entries * sizeof(struct perf_file_attr);
 
     return data_offset;
 }
 
 int perf_session__inject_header(struct perf_session *session,
                 struct evlist *evlist,
                 int fd,
                 struct feat_copier *fc)
 {
     return perf_session__do_write_header(session, evlist, fd, true, fc);
 }
 
 static int perf_header__getbuffer64(struct perf_header *header,
                     int fd, void *buf, size_t size)
 {
     if (readn(fd, buf, size) <= 0)
         return -1;
 
     if (header->needs_swap)
         mem_bswap_64(buf, size);
 
     return 0;
 }
 
 int perf_header__process_sections(struct perf_header *header, int fd,
                   void *data,
                   int (*process)(struct perf_file_section *section,
                          struct perf_header *ph,
                          int feat, int fd, void *data))
 {
     struct perf_file_section *feat_sec, *sec;
     int nr_sections;
     int sec_size;
     int feat;
     int err;
 
     nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
     if (!nr_sections)
         return 0;
 
     feat_sec = sec = calloc(nr_sections, sizeof(*feat_sec));
     if (!feat_sec)
         return -1;
 
     sec_size = sizeof(*feat_sec) * nr_sections;
 
     lseek(fd, header->feat_offset, SEEK_SET);
 
     err = perf_header__getbuffer64(header, fd, feat_sec, sec_size);
     if (err < 0)
         goto out_free;
 
     for_each_set_bit(feat, header->adds_features, HEADER_LAST_FEATURE) {
         err = process(sec++, header, feat, fd, data);
         if (err < 0)
             goto out_free;
     }
     err = 0;
 out_free:
     free(feat_sec);
     return err;
 }
 
 static const int attr_file_abi_sizes[] = {
     [0] = PERF_ATTR_SIZE_VER0,
     [1] = PERF_ATTR_SIZE_VER1,
     [2] = PERF_ATTR_SIZE_VER2,
     [3] = PERF_ATTR_SIZE_VER3,
     [4] = PERF_ATTR_SIZE_VER4,
     0,
 };
 
 /*
  * In the legacy file format, the magic number is not used to encode endianness.
  * hdr_sz was used to encode endianness. But given that hdr_sz can vary based
  * on ABI revisions, we need to try all combinations for all endianness to
  * detect the endianness.
  */
 static int try_all_file_abis(uint64_t hdr_sz, struct perf_header *ph)
 {
     uint64_t ref_size, attr_size;
     int i;
 
     for (i = 0 ; attr_file_abi_sizes[i]; i++) {
         ref_size = attr_file_abi_sizes[i]
              + sizeof(struct perf_file_section);
         if (hdr_sz != ref_size) {
             attr_size = bswap_64(hdr_sz);
             if (attr_size != ref_size)
                 continue;
 
             ph->needs_swap = true;
         }
         pr_debug("ABI%d perf.data file detected, need_swap=%d\n",
              i,
              ph->needs_swap);
         return 0;
     }
     /* could not determine endianness */
     return -1;
 }
 
 #define PERF_PIPE_HDR_VER0  16
 
 static const size_t attr_pipe_abi_sizes[] = {
     [0] = PERF_PIPE_HDR_VER0,
     0,
 };
 
 /*
  * In the legacy pipe format, there is an implicit assumption that endianness
  * between host recording the samples, and host parsing the samples is the
  * same. This is not always the case given that the pipe output may always be
  * redirected into a file and analyzed on a different machine with possibly a
  * different endianness and perf_event ABI revisions in the perf tool itself.
  */
 static int try_all_pipe_abis(uint64_t hdr_sz, struct perf_header *ph)
 {
     u64 attr_size;
     int i;
 
     for (i = 0 ; attr_pipe_abi_sizes[i]; i++) {
         if (hdr_sz != attr_pipe_abi_sizes[i]) {
             attr_size = bswap_64(hdr_sz);
             if (attr_size != hdr_sz)
                 continue;
 
             ph->needs_swap = true;
         }
         pr_debug("Pipe ABI%d perf.data file detected\n", i);
         return 0;
     }
     return -1;
 }
 
 bool is_perf_magic(u64 magic)
 {
     if (!memcmp(&magic, __perf_magic1, sizeof(magic))
         || magic == __perf_magic2
         || magic == __perf_magic2_sw)
         return true;
 
     return false;
 }
 
 static int check_magic_endian(u64 magic, uint64_t hdr_sz,
                   bool is_pipe, struct perf_header *ph)
 {
     int ret;
 
     /* check for legacy format */
     ret = memcmp(&magic, __perf_magic1, sizeof(magic));
     if (ret == 0) {
         ph->version = PERF_HEADER_VERSION_1;
         pr_debug("legacy perf.data format\n");
         if (is_pipe)
             return try_all_pipe_abis(hdr_sz, ph);
 
         return try_all_file_abis(hdr_sz, ph);
     }
     /*
      * the new magic number serves two purposes:
      * - unique number to identify actual perf.data files
      * - encode endianness of file
      */
     ph->version = PERF_HEADER_VERSION_2;
 
     /* check magic number with one endianness */
     if (magic == __perf_magic2)
         return 0;
 
     /* check magic number with opposite endianness */
     if (magic != __perf_magic2_sw)
         return -1;
 
     ph->needs_swap = true;
 
     return 0;
 }
 
 int perf_file_header__read(struct perf_file_header *header,
                struct perf_header *ph, int fd)
 {
     ssize_t ret;
 
     lseek(fd, 0, SEEK_SET);
 
     ret = readn(fd, header, sizeof(*header));
     if (ret <= 0)
         return -1;
 
     if (check_magic_endian(header->magic,
                    header->attr_size, false, ph) < 0) {
         pr_debug("magic/endian check failed\n");
         return -1;
     }
 
     if (ph->needs_swap) {
         mem_bswap_64(header, offsetof(struct perf_file_header,
                  adds_features));
     }
 
     if (header->size != sizeof(*header)) {
         /* Support the previous format */
         if (header->size == offsetof(typeof(*header), adds_features))
             bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
         else
             return -1;
     } else if (ph->needs_swap) {
         /*
          * feature bitmap is declared as an array of unsigned longs --
          * not good since its size can differ between the host that
          * generated the data file and the host analyzing the file.
          *
          * We need to handle endianness, but we don't know the size of
          * the unsigned long where the file was generated. Take a best
          * guess at determining it: try 64-bit swap first (ie., file
          * created on a 64-bit host), and check if the hostname feature
          * bit is set (this feature bit is forced on as of fbe96f2).
          * If the bit is not, undo the 64-bit swap and try a 32-bit
          * swap. If the hostname bit is still not set (e.g., older data
          * file), punt and fallback to the original behavior --
          * clearing all feature bits and setting buildid.
          */
         mem_bswap_64(&header->adds_features,
                 BITS_TO_U64(HEADER_FEAT_BITS));
 
         if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
             /* unswap as u64 */
             mem_bswap_64(&header->adds_features,
                     BITS_TO_U64(HEADER_FEAT_BITS));
 
             /* unswap as u32 */
             mem_bswap_32(&header->adds_features,
                     BITS_TO_U32(HEADER_FEAT_BITS));
         }
 
         if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
             bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
             set_bit(HEADER_BUILD_ID, header->adds_features);
         }
     }
 
     memcpy(&ph->adds_features, &header->adds_features,
            sizeof(ph->adds_features));
 
     ph->data_offset  = header->data.offset;
     ph->data_size    = header->data.size;
     ph->feat_offset  = header->data.offset + header->data.size;
     return 0;
 }
 
 static int perf_file_section__process(struct perf_file_section *section,
                       struct perf_header *ph,
                       int feat, int fd, void *data)
 {
     struct feat_fd fdd = {
         .fd = fd,
         .ph = ph,
         .size   = section->size,
         .offset = section->offset,
     };
 
     if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
         pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
               "%d, continuing...\n", section->offset, feat);
         return 0;
     }
 
     if (feat >= HEADER_LAST_FEATURE) {
         pr_debug("unknown feature %d, continuing...\n", feat);
         return 0;
     }
 
     if (!feat_ops[feat].process)
         return 0;
 
     return feat_ops[feat].process(&fdd, data);
 }
 
 static int perf_file_header__read_pipe(struct perf_pipe_file_header *header,
                        struct perf_header *ph,
                        struct perf_data* data,
                        bool repipe, int repipe_fd)
 {
     struct feat_fd ff = {
         .fd = repipe_fd,
         .ph = ph,
     };
     ssize_t ret;
 
     ret = perf_data__read(data, header, sizeof(*header));
     if (ret <= 0)
         return -1;
 
     if (check_magic_endian(header->magic, header->size, true, ph) < 0) {
         pr_debug("endian/magic failed\n");
         return -1;
     }
 
     if (ph->needs_swap)
         header->size = bswap_64(header->size);
 
     if (repipe && do_write(&ff, header, sizeof(*header)) < 0)
         return -1;
 
     return 0;
 }
 
 static int perf_header__read_pipe(struct perf_session *session, int repipe_fd)
 {
     struct perf_header *header = &session->header;
     struct perf_pipe_file_header f_header;
 
     if (perf_file_header__read_pipe(&f_header, header, session->data,
                     session->repipe, repipe_fd) < 0) {
         pr_debug("incompatible file format\n");
         return -EINVAL;
     }
 
     return f_header.size == sizeof(f_header) ? 0 : -1;
 }
 
 static int read_attr(int fd, struct perf_header *ph,
              struct perf_file_attr *f_attr)
 {
     struct perf_event_attr *attr = &f_attr->attr;
     size_t sz, left;
     size_t our_sz = sizeof(f_attr->attr);
     ssize_t ret;
 
     memset(f_attr, 0, sizeof(*f_attr));
 
     /* read minimal guaranteed structure */
     ret = readn(fd, attr, PERF_ATTR_SIZE_VER0);
     if (ret <= 0) {
         pr_debug("cannot read %d bytes of header attr\n",
              PERF_ATTR_SIZE_VER0);
         return -1;
     }
 
     /* on file perf_event_attr size */
     sz = attr->size;
 
     if (ph->needs_swap)
         sz = bswap_32(sz);
 
     if (sz == 0) {
         /* assume ABI0 */
         sz =  PERF_ATTR_SIZE_VER0;
     } else if (sz > our_sz) {
         pr_debug("file uses a more recent and unsupported ABI"
              " (%zu bytes extra)\n", sz - our_sz);
         return -1;
     }
     /* what we have not yet read and that we know about */
     left = sz - PERF_ATTR_SIZE_VER0;
     if (left) {
         void *ptr = attr;
         ptr += PERF_ATTR_SIZE_VER0;
 
         ret = readn(fd, ptr, left);
     }
     /* read perf_file_section, ids are read in caller */
     ret = readn(fd, &f_attr->ids, sizeof(f_attr->ids));
 
     return ret <= 0 ? -1 : 0;
 }
 
 static int evsel__prepare_tracepoint_event(struct evsel *evsel, struct tep_handle *pevent)
 {
     struct tep_event *event;
     char bf[128];
 
     /* already prepared */
     if (evsel->tp_format)
         return 0;
 
     if (pevent == NULL) {
         pr_debug("broken or missing trace data\n");
         return -1;
     }
 
     event = tep_find_event(pevent, evsel->core.attr.config);
     if (event == NULL) {
         pr_debug("cannot find event format for %d\n", (int)evsel->core.attr.config);
         return -1;
     }
 
     if (!evsel->name) {
         snprintf(bf, sizeof(bf), "%s:%s", event->system, event->name);
         evsel->name = strdup(bf);
         if (evsel->name == NULL)
             return -1;
     }
 
     evsel->tp_format = event;
     return 0;
 }
 
 static int evlist__prepare_tracepoint_events(struct evlist *evlist, struct tep_handle *pevent)
 {
     struct evsel *pos;
 
     evlist__for_each_entry(evlist, pos) {
         if (pos->core.attr.type == PERF_TYPE_TRACEPOINT &&
             evsel__prepare_tracepoint_event(pos, pevent))
             return -1;
     }
 
     return 0;
 }
 
 int perf_session__read_header(struct perf_session *session, int repipe_fd)
 {
     struct perf_data *data = session->data;
     struct perf_header *header = &session->header;
     struct perf_file_header f_header;
     struct perf_file_attr   f_attr;
     u64         f_id;
     int nr_attrs, nr_ids, i, j, err;
     int fd = perf_data__fd(data);
 
     session->evlist = evlist__new();
     if (session->evlist == NULL)
         return -ENOMEM;
 
     session->evlist->env = &header->env;
     session->machines.host.env = &header->env;
 
     /*
      * We can read 'pipe' data event from regular file,
      * check for the pipe header regardless of source.
      */
     err = perf_header__read_pipe(session, repipe_fd);
     if (!err || perf_data__is_pipe(data)) {
         data->is_pipe = true;
         return err;
     }
 
     if (perf_file_header__read(&f_header, header, fd) < 0)
         return -EINVAL;
 
     if (header->needs_swap && data->in_place_update) {
         pr_err("In-place update not supported when byte-swapping is required\n");
         return -EINVAL;
     }
 
     /*
      * Sanity check that perf.data was written cleanly; data size is
      * initialized to 0 and updated only if the on_exit function is run.
      * If data size is still 0 then the file contains only partial
      * information.  Just warn user and process it as much as it can.
      */
     if (f_header.data.size == 0) {
         pr_warning("WARNING: The %s file's data size field is 0 which is unexpected.\n"
                "Was the 'perf record' command properly terminated?\n",
                data->file.path);
     }
 
     if (f_header.attr_size == 0) {
         pr_err("ERROR: The %s file's attr size field is 0 which is unexpected.\n"
                "Was the 'perf record' command properly terminated?\n",
                data->file.path);
         return -EINVAL;
     }
 
     nr_attrs = f_header.attrs.size / f_header.attr_size;
     lseek(fd, f_header.attrs.offset, SEEK_SET);
 
     for (i = 0; i < nr_attrs; i++) {
         struct evsel *evsel;
         off_t tmp;
 
         if (read_attr(fd, header, &f_attr) < 0)
             goto out_errno;
 
         if (header->needs_swap) {
             f_attr.ids.size   = bswap_64(f_attr.ids.size);
             f_attr.ids.offset = bswap_64(f_attr.ids.offset);
             perf_event__attr_swap(&f_attr.attr);
         }
 
         tmp = lseek(fd, 0, SEEK_CUR);
         evsel = evsel__new(&f_attr.attr);
 
         if (evsel == NULL)
             goto out_delete_evlist;
 
         evsel->needs_swap = header->needs_swap;
         /*
          * Do it before so that if perf_evsel__alloc_id fails, this
          * entry gets purged too at evlist__delete().
          */
         evlist__add(session->evlist, evsel);
 
         nr_ids = f_attr.ids.size / sizeof(u64);
         /*
          * We don't have the cpu and thread maps on the header, so
          * for allocating the perf_sample_id table we fake 1 cpu and
          * hattr->ids threads.
          */
         if (perf_evsel__alloc_id(&evsel->core, 1, nr_ids))
             goto out_delete_evlist;
 
         lseek(fd, f_attr.ids.offset, SEEK_SET);
 
         for (j = 0; j < nr_ids; j++) {
             if (perf_header__getbuffer64(header, fd, &f_id, sizeof(f_id)))
                 goto out_errno;
 
             perf_evlist__id_add(&session->evlist->core, &evsel->core, 0, j, f_id);
         }
 
         lseek(fd, tmp, SEEK_SET);
     }
 
     perf_header__process_sections(header, fd, &session->tevent,
                       perf_file_section__process);
 
     if (evlist__prepare_tracepoint_events(session->evlist, session->tevent.pevent))
         goto out_delete_evlist;
 
     return 0;
 out_errno:
     return -errno;
 
 out_delete_evlist:
     evlist__delete(session->evlist);
     session->evlist = NULL;
     return -ENOMEM;
 }
 
 int perf_event__process_feature(struct perf_session *session,
                 union perf_event *event)
 {
     struct perf_tool *tool = session->tool;
     struct feat_fd ff = { .fd = 0 };
     struct perf_record_header_feature *fe = (struct perf_record_header_feature *)event;
     int type = fe->header.type;
     u64 feat = fe->feat_id;
     int ret = 0;
 
     if (type < 0 || type >= PERF_RECORD_HEADER_MAX) {
         pr_warning("invalid record type %d in pipe-mode\n", type);
         return 0;
     }
     if (feat == HEADER_RESERVED || feat >= HEADER_LAST_FEATURE) {
         pr_warning("invalid record type %d in pipe-mode\n", type);
         return -1;
     }
 
     if (!feat_ops[feat].process)
         return 0;
 
     ff.buf  = (void *)fe->data;
     ff.size = event->header.size - sizeof(*fe);
     ff.ph = &session->header;
 
     if (feat_ops[feat].process(&ff, NULL)) {
         ret = -1;
         goto out;
     }
 
     if (!feat_ops[feat].print || !tool->show_feat_hdr)
         goto out;
 
     if (!feat_ops[feat].full_only ||
         tool->show_feat_hdr >= SHOW_FEAT_HEADER_FULL_INFO) {
         feat_ops[feat].print(&ff, stdout);
     } else {
         fprintf(stdout, "# %s info available, use -I to display\n",
             feat_ops[feat].name);
     }
 out:
     free_event_desc(ff.events);
     return ret;
 }
 
 size_t perf_event__fprintf_event_update(union perf_event *event, FILE *fp)
 {
     struct perf_record_event_update *ev = &event->event_update;
     struct perf_record_event_update_scale *ev_scale;
     struct perf_record_event_update_cpus *ev_cpus;
     struct perf_cpu_map *map;
     size_t ret;
 
     ret = fprintf(fp, "\n... id:    %" PRI_lu64 "\n", ev->id);
 
     switch (ev->type) {
     case PERF_EVENT_UPDATE__SCALE:
         ev_scale = (struct perf_record_event_update_scale *)ev->data;
         ret += fprintf(fp, "... scale: %f\n", ev_scale->scale);
         break;
     case PERF_EVENT_UPDATE__UNIT:
         ret += fprintf(fp, "... unit:  %s\n", ev->data);
         break;
     case PERF_EVENT_UPDATE__NAME:
         ret += fprintf(fp, "... name:  %s\n", ev->data);
         break;
     case PERF_EVENT_UPDATE__CPUS:
         ev_cpus = (struct perf_record_event_update_cpus *)ev->data;
         ret += fprintf(fp, "... ");
 
         map = cpu_map__new_data(&ev_cpus->cpus);
         if (map)
             ret += cpu_map__fprintf(map, fp);
         else
             ret += fprintf(fp, "failed to get cpus\n");
         break;
     default:
         ret += fprintf(fp, "... unknown type\n");
         break;
     }
 
     return ret;
 }
 
 int perf_event__process_attr(struct perf_tool *tool __maybe_unused,
                  union perf_event *event,
                  struct evlist **pevlist)
 {
     u32 i, ids, n_ids;
     struct evsel *evsel;
     struct evlist *evlist = *pevlist;
 
     if (evlist == NULL) {
         *pevlist = evlist = evlist__new();
         if (evlist == NULL)
             return -ENOMEM;
     }
 
     evsel = evsel__new(&event->attr.attr);
     if (evsel == NULL)
         return -ENOMEM;
 
     evlist__add(evlist, evsel);
 
     ids = event->header.size;
     ids -= (void *)&event->attr.id - (void *)event;
     n_ids = ids / sizeof(u64);
     /*
      * We don't have the cpu and thread maps on the header, so
      * for allocating the perf_sample_id table we fake 1 cpu and
      * hattr->ids threads.
      */
     if (perf_evsel__alloc_id(&evsel->core, 1, n_ids))
         return -ENOMEM;
 
     for (i = 0; i < n_ids; i++) {
         perf_evlist__id_add(&evlist->core, &evsel->core, 0, i, event->attr.id[i]);
     }
 
     return 0;
 }
 
 int perf_event__process_event_update(struct perf_tool *tool __maybe_unused,
                      union perf_event *event,
                      struct evlist **pevlist)
 {
     struct perf_record_event_update *ev = &event->event_update;
     struct perf_record_event_update_scale *ev_scale;
     struct perf_record_event_update_cpus *ev_cpus;
     struct evlist *evlist;
     struct evsel *evsel;
     struct perf_cpu_map *map;
 
     if (dump_trace)
         perf_event__fprintf_event_update(event, stdout);
 
     if (!pevlist || *pevlist == NULL)
         return -EINVAL;
 
     evlist = *pevlist;
 
     evsel = evlist__id2evsel(evlist, ev->id);
     if (evsel == NULL)
         return -EINVAL;
 
     switch (ev->type) {
     case PERF_EVENT_UPDATE__UNIT:
         free((char *)evsel->unit);
         evsel->unit = strdup(ev->data);
         break;
     case PERF_EVENT_UPDATE__NAME:
         free(evsel->name);
         evsel->name = strdup(ev->data);
         break;
     case PERF_EVENT_UPDATE__SCALE:
         ev_scale = (struct perf_record_event_update_scale *)ev->data;
         evsel->scale = ev_scale->scale;
         break;
     case PERF_EVENT_UPDATE__CPUS:
         ev_cpus = (struct perf_record_event_update_cpus *)ev->data;
         map = cpu_map__new_data(&ev_cpus->cpus);
         if (map) {
             perf_cpu_map__put(evsel->core.own_cpus);
             evsel->core.own_cpus = map;
         } else
             pr_err("failed to get event_update cpus\n");
     default:
         break;
     }
 
     return 0;
 }
 
 int perf_event__process_tracing_data(struct perf_session *session,
                      union perf_event *event)
 {
     ssize_t size_read, padding, size = event->tracing_data.size;
     int fd = perf_data__fd(session->data);
     char buf[BUFSIZ];
 
     /*
      * The pipe fd is already in proper place and in any case
      * we can't move it, and we'd screw the case where we read
      * 'pipe' data from regular file. The trace_report reads
      * data from 'fd' so we need to set it directly behind the
      * event, where the tracing data starts.
      */
     if (!perf_data__is_pipe(session->data)) {
         off_t offset = lseek(fd, 0, SEEK_CUR);
 
         /* setup for reading amidst mmap */
         lseek(fd, offset + sizeof(struct perf_record_header_tracing_data),
               SEEK_SET);
     }
 
     size_read = trace_report(fd, &session->tevent,
                  session->repipe);
     padding = PERF_ALIGN(size_read, sizeof(u64)) - size_read;
 
     if (readn(fd, buf, padding) < 0) {
         pr_err("%s: reading input file", __func__);
         return -1;
     }
     if (session->repipe) {
         int retw = write(STDOUT_FILENO, buf, padding);
         if (retw <= 0 || retw != padding) {
             pr_err("%s: repiping tracing data padding", __func__);
             return -1;
         }
     }
 
     if (size_read + padding != size) {
         pr_err("%s: tracing data size mismatch", __func__);
         return -1;
     }
 
     evlist__prepare_tracepoint_events(session->evlist, session->tevent.pevent);
 
     return size_read + padding;
 }
 
 int perf_event__process_build_id(struct perf_session *session,
                  union perf_event *event)
 {
     __event_process_build_id(&event->build_id,
                  event->build_id.filename,
                  session);
     return 0;
 }