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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 <linux/err.h>
 #include <linux/kernel.h>
 #include <linux/zalloc.h>
 #include <api/fs/fs.h>
 
 #include <byteswap.h>
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/mman.h>
 #include <perf/cpumap.h>
 
 #include "map_symbol.h"
 #include "branch.h"
 #include "debug.h"
 #include "env.h"
 #include "evlist.h"
 #include "evsel.h"
 #include "memswap.h"
 #include "map.h"
 #include "symbol.h"
 #include "session.h"
 #include "tool.h"
 #include "perf_regs.h"
 #include "asm/bug.h"
 #include "auxtrace.h"
 #include "thread.h"
 #include "thread-stack.h"
 #include "sample-raw.h"
 #include "stat.h"
 #include "tsc.h"
 #include "ui/progress.h"
 #include "../perf.h"
 #include "arch/common.h"
 #include "units.h"
 #include <internal/lib.h>
 
 #ifdef HAVE_ZSTD_SUPPORT
 static int perf_session__process_compressed_event(struct perf_session *session,
                           union perf_event *event, u64 file_offset,
                           const char *file_path)
 {
     void *src;
     size_t decomp_size, src_size;
     u64 decomp_last_rem = 0;
     size_t mmap_len, decomp_len = session->header.env.comp_mmap_len;
     struct decomp *decomp, *decomp_last = session->active_decomp->decomp_last;
 
     if (decomp_last) {
         decomp_last_rem = decomp_last->size - decomp_last->head;
         decomp_len += decomp_last_rem;
     }
 
     mmap_len = sizeof(struct decomp) + decomp_len;
     decomp = mmap(NULL, mmap_len, PROT_READ|PROT_WRITE,
               MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
     if (decomp == MAP_FAILED) {
         pr_err("Couldn't allocate memory for decompression\n");
         return -1;
     }
 
     decomp->file_pos = file_offset;
     decomp->file_path = file_path;
     decomp->mmap_len = mmap_len;
     decomp->head = 0;
 
     if (decomp_last_rem) {
         memcpy(decomp->data, &(decomp_last->data[decomp_last->head]), decomp_last_rem);
         decomp->size = decomp_last_rem;
     }
 
     src = (void *)event + sizeof(struct perf_record_compressed);
     src_size = event->pack.header.size - sizeof(struct perf_record_compressed);
 
     decomp_size = zstd_decompress_stream(session->active_decomp->zstd_decomp, src, src_size,
                 &(decomp->data[decomp_last_rem]), decomp_len - decomp_last_rem);
     if (!decomp_size) {
         munmap(decomp, mmap_len);
         pr_err("Couldn't decompress data\n");
         return -1;
     }
 
     decomp->size += decomp_size;
 
     if (session->active_decomp->decomp == NULL)
         session->active_decomp->decomp = decomp;
     else
         session->active_decomp->decomp_last->next = decomp;
 
     session->active_decomp->decomp_last = decomp;
 
     pr_debug("decomp (B): %zd to %zd\n", src_size, decomp_size);
 
     return 0;
 }
 #else /* !HAVE_ZSTD_SUPPORT */
 #define perf_session__process_compressed_event perf_session__process_compressed_event_stub
 #endif
 
 static int perf_session__deliver_event(struct perf_session *session,
                        union perf_event *event,
                        struct perf_tool *tool,
                        u64 file_offset,
                        const char *file_path);
 
 static int perf_session__open(struct perf_session *session, int repipe_fd)
 {
     struct perf_data *data = session->data;
 
     if (perf_session__read_header(session, repipe_fd) < 0) {
         pr_err("incompatible file format (rerun with -v to learn more)\n");
         return -1;
     }
 
     if (perf_data__is_pipe(data))
         return 0;
 
     if (perf_header__has_feat(&session->header, HEADER_STAT))
         return 0;
 
     if (!evlist__valid_sample_type(session->evlist)) {
         pr_err("non matching sample_type\n");
         return -1;
     }
 
     if (!evlist__valid_sample_id_all(session->evlist)) {
         pr_err("non matching sample_id_all\n");
         return -1;
     }
 
     if (!evlist__valid_read_format(session->evlist)) {
         pr_err("non matching read_format\n");
         return -1;
     }
 
     return 0;
 }
 
 void perf_session__set_id_hdr_size(struct perf_session *session)
 {
     u16 id_hdr_size = evlist__id_hdr_size(session->evlist);
 
     machines__set_id_hdr_size(&session->machines, id_hdr_size);
 }
 
 int perf_session__create_kernel_maps(struct perf_session *session)
 {
     int ret = machine__create_kernel_maps(&session->machines.host);
 
     if (ret >= 0)
         ret = machines__create_guest_kernel_maps(&session->machines);
     return ret;
 }
 
 static void perf_session__destroy_kernel_maps(struct perf_session *session)
 {
     machines__destroy_kernel_maps(&session->machines);
 }
 
 static bool perf_session__has_comm_exec(struct perf_session *session)
 {
     struct evsel *evsel;
 
     evlist__for_each_entry(session->evlist, evsel) {
         if (evsel->core.attr.comm_exec)
             return true;
     }
 
     return false;
 }
 
 static void perf_session__set_comm_exec(struct perf_session *session)
 {
     bool comm_exec = perf_session__has_comm_exec(session);
 
     machines__set_comm_exec(&session->machines, comm_exec);
 }
 
 static int ordered_events__deliver_event(struct ordered_events *oe,
                      struct ordered_event *event)
 {
     struct perf_session *session = container_of(oe, struct perf_session,
                             ordered_events);
 
     return perf_session__deliver_event(session, event->event,
                        session->tool, event->file_offset,
                        event->file_path);
 }
 
 struct perf_session *__perf_session__new(struct perf_data *data,
                      bool repipe, int repipe_fd,
                      struct perf_tool *tool)
 {
     int ret = -ENOMEM;
     struct perf_session *session = zalloc(sizeof(*session));
 
     if (!session)
         goto out;
 
     session->repipe = repipe;
     session->tool   = tool;
     session->decomp_data.zstd_decomp = &session->zstd_data;
     session->active_decomp = &session->decomp_data;
     INIT_LIST_HEAD(&session->auxtrace_index);
     machines__init(&session->machines);
     ordered_events__init(&session->ordered_events,
                  ordered_events__deliver_event, NULL);
 
     perf_env__init(&session->header.env);
     if (data) {
         ret = perf_data__open(data);
         if (ret < 0)
             goto out_delete;
 
         session->data = data;
 
         if (perf_data__is_read(data)) {
             ret = perf_session__open(session, repipe_fd);
             if (ret < 0)
                 goto out_delete;
 
             /*
              * set session attributes that are present in perf.data
              * but not in pipe-mode.
              */
             if (!data->is_pipe) {
                 perf_session__set_id_hdr_size(session);
                 perf_session__set_comm_exec(session);
             }
 
             evlist__init_trace_event_sample_raw(session->evlist);
 
             /* Open the directory data. */
             if (data->is_dir) {
                 ret = perf_data__open_dir(data);
                 if (ret)
                     goto out_delete;
             }
 
             if (!symbol_conf.kallsyms_name &&
                 !symbol_conf.vmlinux_name)
                 symbol_conf.kallsyms_name = perf_data__kallsyms_name(data);
         }
     } else  {
         session->machines.host.env = &perf_env;
     }
 
     session->machines.host.single_address_space =
         perf_env__single_address_space(session->machines.host.env);
 
     if (!data || perf_data__is_write(data)) {
         /*
          * In O_RDONLY mode this will be performed when reading the
          * kernel MMAP event, in perf_event__process_mmap().
          */
         if (perf_session__create_kernel_maps(session) < 0)
             pr_warning("Cannot read kernel map\n");
     }
 
     /*
      * In pipe-mode, evlist is empty until PERF_RECORD_HEADER_ATTR is
      * processed, so evlist__sample_id_all is not meaningful here.
      */
     if ((!data || !data->is_pipe) && tool && tool->ordering_requires_timestamps &&
         tool->ordered_events && !evlist__sample_id_all(session->evlist)) {
         dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n");
         tool->ordered_events = false;
     }
 
     return session;
 
  out_delete:
     perf_session__delete(session);
  out:
     return ERR_PTR(ret);
 }
 
 static void perf_session__delete_threads(struct perf_session *session)
 {
     machine__delete_threads(&session->machines.host);
 }
 
 static void perf_decomp__release_events(struct decomp *next)
 {
     struct decomp *decomp;
     size_t mmap_len;
 
     do {
         decomp = next;
         if (decomp == NULL)
             break;
         next = decomp->next;
         mmap_len = decomp->mmap_len;
         munmap(decomp, mmap_len);
     } while (1);
 }
 
 void perf_session__delete(struct perf_session *session)
 {
     if (session == NULL)
         return;
     auxtrace__free(session);
     auxtrace_index__free(&session->auxtrace_index);
     perf_session__destroy_kernel_maps(session);
     perf_session__delete_threads(session);
     perf_decomp__release_events(session->decomp_data.decomp);
     perf_env__exit(&session->header.env);
     machines__exit(&session->machines);
     if (session->data) {
         if (perf_data__is_read(session->data))
             evlist__delete(session->evlist);
         perf_data__close(session->data);
     }
     trace_event__cleanup(&session->tevent);
     free(session);
 }
 
 static int process_event_synth_tracing_data_stub(struct perf_session *session
                          __maybe_unused,
                          union perf_event *event
                          __maybe_unused)
 {
     dump_printf(": unhandled!\n");
     return 0;
 }
 
 static int process_event_synth_attr_stub(struct perf_tool *tool __maybe_unused,
                      union perf_event *event __maybe_unused,
                      struct evlist **pevlist
                      __maybe_unused)
 {
     dump_printf(": unhandled!\n");
     return 0;
 }
 
 static int process_event_synth_event_update_stub(struct perf_tool *tool __maybe_unused,
                          union perf_event *event __maybe_unused,
                          struct evlist **pevlist
                          __maybe_unused)
 {
     if (dump_trace)
         perf_event__fprintf_event_update(event, stdout);
 
     dump_printf(": unhandled!\n");
     return 0;
 }
 
 static int process_event_sample_stub(struct perf_tool *tool __maybe_unused,
                      union perf_event *event __maybe_unused,
                      struct perf_sample *sample __maybe_unused,
                      struct evsel *evsel __maybe_unused,
                      struct machine *machine __maybe_unused)
 {
     dump_printf(": unhandled!\n");
     return 0;
 }
 
 static int process_event_stub(struct perf_tool *tool __maybe_unused,
                   union perf_event *event __maybe_unused,
                   struct perf_sample *sample __maybe_unused,
                   struct machine *machine __maybe_unused)
 {
     dump_printf(": unhandled!\n");
     return 0;
 }
 
 static int process_finished_round_stub(struct perf_tool *tool __maybe_unused,
                        union perf_event *event __maybe_unused,
                        struct ordered_events *oe __maybe_unused)
 {
     dump_printf(": unhandled!\n");
     return 0;
 }
 
 static int skipn(int fd, off_t n)
 {
     char buf[4096];
     ssize_t ret;
 
     while (n > 0) {
         ret = read(fd, buf, min(n, (off_t)sizeof(buf)));
         if (ret <= 0)
             return ret;
         n -= ret;
     }
 
     return 0;
 }
 
 static s64 process_event_auxtrace_stub(struct perf_session *session __maybe_unused,
                        union perf_event *event)
 {
     dump_printf(": unhandled!\n");
     if (perf_data__is_pipe(session->data))
         skipn(perf_data__fd(session->data), event->auxtrace.size);
     return event->auxtrace.size;
 }
 
 static int process_event_op2_stub(struct perf_session *session __maybe_unused,
                   union perf_event *event __maybe_unused)
 {
     dump_printf(": unhandled!\n");
     return 0;
 }
 
 
 static
 int process_event_thread_map_stub(struct perf_session *session __maybe_unused,
                   union perf_event *event __maybe_unused)
 {
     if (dump_trace)
         perf_event__fprintf_thread_map(event, stdout);
 
     dump_printf(": unhandled!\n");
     return 0;
 }
 
 static
 int process_event_cpu_map_stub(struct perf_session *session __maybe_unused,
                    union perf_event *event __maybe_unused)
 {
     if (dump_trace)
         perf_event__fprintf_cpu_map(event, stdout);
 
     dump_printf(": unhandled!\n");
     return 0;
 }
 
 static
 int process_event_stat_config_stub(struct perf_session *session __maybe_unused,
                    union perf_event *event __maybe_unused)
 {
     if (dump_trace)
         perf_event__fprintf_stat_config(event, stdout);
 
     dump_printf(": unhandled!\n");
     return 0;
 }
 
 static int process_stat_stub(struct perf_session *perf_session __maybe_unused,
                  union perf_event *event)
 {
     if (dump_trace)
         perf_event__fprintf_stat(event, stdout);
 
     dump_printf(": unhandled!\n");
     return 0;
 }
 
 static int process_stat_round_stub(struct perf_session *perf_session __maybe_unused,
                    union perf_event *event)
 {
     if (dump_trace)
         perf_event__fprintf_stat_round(event, stdout);
 
     dump_printf(": unhandled!\n");
     return 0;
 }
 
 static int process_event_time_conv_stub(struct perf_session *perf_session __maybe_unused,
                     union perf_event *event)
 {
     if (dump_trace)
         perf_event__fprintf_time_conv(event, stdout);
 
     dump_printf(": unhandled!\n");
     return 0;
 }
 
 static int perf_session__process_compressed_event_stub(struct perf_session *session __maybe_unused,
                                union perf_event *event __maybe_unused,
                                u64 file_offset __maybe_unused,
                                const char *file_path __maybe_unused)
 {
        dump_printf(": unhandled!\n");
        return 0;
 }
 
 void perf_tool__fill_defaults(struct perf_tool *tool)
 {
     if (tool->sample == NULL)
         tool->sample = process_event_sample_stub;
     if (tool->mmap == NULL)
         tool->mmap = process_event_stub;
     if (tool->mmap2 == NULL)
         tool->mmap2 = process_event_stub;
     if (tool->comm == NULL)
         tool->comm = process_event_stub;
     if (tool->namespaces == NULL)
         tool->namespaces = process_event_stub;
     if (tool->cgroup == NULL)
         tool->cgroup = process_event_stub;
     if (tool->fork == NULL)
         tool->fork = process_event_stub;
     if (tool->exit == NULL)
         tool->exit = process_event_stub;
     if (tool->lost == NULL)
         tool->lost = perf_event__process_lost;
     if (tool->lost_samples == NULL)
         tool->lost_samples = perf_event__process_lost_samples;
     if (tool->aux == NULL)
         tool->aux = perf_event__process_aux;
     if (tool->itrace_start == NULL)
         tool->itrace_start = perf_event__process_itrace_start;
     if (tool->context_switch == NULL)
         tool->context_switch = perf_event__process_switch;
     if (tool->ksymbol == NULL)
         tool->ksymbol = perf_event__process_ksymbol;
     if (tool->bpf == NULL)
         tool->bpf = perf_event__process_bpf;
     if (tool->text_poke == NULL)
         tool->text_poke = perf_event__process_text_poke;
     if (tool->aux_output_hw_id == NULL)
         tool->aux_output_hw_id = perf_event__process_aux_output_hw_id;
     if (tool->read == NULL)
         tool->read = process_event_sample_stub;
     if (tool->throttle == NULL)
         tool->throttle = process_event_stub;
     if (tool->unthrottle == NULL)
         tool->unthrottle = process_event_stub;
     if (tool->attr == NULL)
         tool->attr = process_event_synth_attr_stub;
     if (tool->event_update == NULL)
         tool->event_update = process_event_synth_event_update_stub;
     if (tool->tracing_data == NULL)
         tool->tracing_data = process_event_synth_tracing_data_stub;
     if (tool->build_id == NULL)
         tool->build_id = process_event_op2_stub;
     if (tool->finished_round == NULL) {
         if (tool->ordered_events)
             tool->finished_round = perf_event__process_finished_round;
         else
             tool->finished_round = process_finished_round_stub;
     }
     if (tool->id_index == NULL)
         tool->id_index = process_event_op2_stub;
     if (tool->auxtrace_info == NULL)
         tool->auxtrace_info = process_event_op2_stub;
     if (tool->auxtrace == NULL)
         tool->auxtrace = process_event_auxtrace_stub;
     if (tool->auxtrace_error == NULL)
         tool->auxtrace_error = process_event_op2_stub;
     if (tool->thread_map == NULL)
         tool->thread_map = process_event_thread_map_stub;
     if (tool->cpu_map == NULL)
         tool->cpu_map = process_event_cpu_map_stub;
     if (tool->stat_config == NULL)
         tool->stat_config = process_event_stat_config_stub;
     if (tool->stat == NULL)
         tool->stat = process_stat_stub;
     if (tool->stat_round == NULL)
         tool->stat_round = process_stat_round_stub;
     if (tool->time_conv == NULL)
         tool->time_conv = process_event_time_conv_stub;
     if (tool->feature == NULL)
         tool->feature = process_event_op2_stub;
     if (tool->compressed == NULL)
         tool->compressed = perf_session__process_compressed_event;
     if (tool->finished_init == NULL)
         tool->finished_init = process_event_op2_stub;
 }
 
 static void swap_sample_id_all(union perf_event *event, void *data)
 {
     void *end = (void *) event + event->header.size;
     int size = end - data;
 
     BUG_ON(size % sizeof(u64));
     mem_bswap_64(data, size);
 }
 
 static void perf_event__all64_swap(union perf_event *event,
                    bool sample_id_all __maybe_unused)
 {
     struct perf_event_header *hdr = &event->header;
     mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr));
 }
 
 static void perf_event__comm_swap(union perf_event *event, bool sample_id_all)
 {
     event->comm.pid = bswap_32(event->comm.pid);
     event->comm.tid = bswap_32(event->comm.tid);
 
     if (sample_id_all) {
         void *data = &event->comm.comm;
 
         data += PERF_ALIGN(strlen(data) + 1, sizeof(u64));
         swap_sample_id_all(event, data);
     }
 }
 
 static void perf_event__mmap_swap(union perf_event *event,
                   bool sample_id_all)
 {
     event->mmap.pid   = bswap_32(event->mmap.pid);
     event->mmap.tid   = bswap_32(event->mmap.tid);
     event->mmap.start = bswap_64(event->mmap.start);
     event->mmap.len   = bswap_64(event->mmap.len);
     event->mmap.pgoff = bswap_64(event->mmap.pgoff);
 
     if (sample_id_all) {
         void *data = &event->mmap.filename;
 
         data += PERF_ALIGN(strlen(data) + 1, sizeof(u64));
         swap_sample_id_all(event, data);
     }
 }
 
 static void perf_event__mmap2_swap(union perf_event *event,
                   bool sample_id_all)
 {
     event->mmap2.pid   = bswap_32(event->mmap2.pid);
     event->mmap2.tid   = bswap_32(event->mmap2.tid);
     event->mmap2.start = bswap_64(event->mmap2.start);
     event->mmap2.len   = bswap_64(event->mmap2.len);
     event->mmap2.pgoff = bswap_64(event->mmap2.pgoff);
 
     if (!(event->header.misc & PERF_RECORD_MISC_MMAP_BUILD_ID)) {
         event->mmap2.maj   = bswap_32(event->mmap2.maj);
         event->mmap2.min   = bswap_32(event->mmap2.min);
         event->mmap2.ino   = bswap_64(event->mmap2.ino);
         event->mmap2.ino_generation = bswap_64(event->mmap2.ino_generation);
     }
 
     if (sample_id_all) {
         void *data = &event->mmap2.filename;
 
         data += PERF_ALIGN(strlen(data) + 1, sizeof(u64));
         swap_sample_id_all(event, data);
     }
 }
 static void perf_event__task_swap(union perf_event *event, bool sample_id_all)
 {
     event->fork.pid  = bswap_32(event->fork.pid);
     event->fork.tid  = bswap_32(event->fork.tid);
     event->fork.ppid = bswap_32(event->fork.ppid);
     event->fork.ptid = bswap_32(event->fork.ptid);
     event->fork.time = bswap_64(event->fork.time);
 
     if (sample_id_all)
         swap_sample_id_all(event, &event->fork + 1);
 }
 
 static void perf_event__read_swap(union perf_event *event, bool sample_id_all)
 {
     event->read.pid      = bswap_32(event->read.pid);
     event->read.tid      = bswap_32(event->read.tid);
     event->read.value    = bswap_64(event->read.value);
     event->read.time_enabled = bswap_64(event->read.time_enabled);
     event->read.time_running = bswap_64(event->read.time_running);
     event->read.id       = bswap_64(event->read.id);
 
     if (sample_id_all)
         swap_sample_id_all(event, &event->read + 1);
 }
 
 static void perf_event__aux_swap(union perf_event *event, bool sample_id_all)
 {
     event->aux.aux_offset = bswap_64(event->aux.aux_offset);
     event->aux.aux_size   = bswap_64(event->aux.aux_size);
     event->aux.flags      = bswap_64(event->aux.flags);
 
     if (sample_id_all)
         swap_sample_id_all(event, &event->aux + 1);
 }
 
 static void perf_event__itrace_start_swap(union perf_event *event,
                       bool sample_id_all)
 {
     event->itrace_start.pid  = bswap_32(event->itrace_start.pid);
     event->itrace_start.tid  = bswap_32(event->itrace_start.tid);
 
     if (sample_id_all)
         swap_sample_id_all(event, &event->itrace_start + 1);
 }
 
 static void perf_event__switch_swap(union perf_event *event, bool sample_id_all)
 {
     if (event->header.type == PERF_RECORD_SWITCH_CPU_WIDE) {
         event->context_switch.next_prev_pid =
                 bswap_32(event->context_switch.next_prev_pid);
         event->context_switch.next_prev_tid =
                 bswap_32(event->context_switch.next_prev_tid);
     }
 
     if (sample_id_all)
         swap_sample_id_all(event, &event->context_switch + 1);
 }
 
 static void perf_event__text_poke_swap(union perf_event *event, bool sample_id_all)
 {
     event->text_poke.addr    = bswap_64(event->text_poke.addr);
     event->text_poke.old_len = bswap_16(event->text_poke.old_len);
     event->text_poke.new_len = bswap_16(event->text_poke.new_len);
 
     if (sample_id_all) {
         size_t len = sizeof(event->text_poke.old_len) +
                  sizeof(event->text_poke.new_len) +
                  event->text_poke.old_len +
                  event->text_poke.new_len;
         void *data = &event->text_poke.old_len;
 
         data += PERF_ALIGN(len, sizeof(u64));
         swap_sample_id_all(event, data);
     }
 }
 
 static void perf_event__throttle_swap(union perf_event *event,
                       bool sample_id_all)
 {
     event->throttle.time      = bswap_64(event->throttle.time);
     event->throttle.id    = bswap_64(event->throttle.id);
     event->throttle.stream_id = bswap_64(event->throttle.stream_id);
 
     if (sample_id_all)
         swap_sample_id_all(event, &event->throttle + 1);
 }
 
 static void perf_event__namespaces_swap(union perf_event *event,
                     bool sample_id_all)
 {
     u64 i;
 
     event->namespaces.pid       = bswap_32(event->namespaces.pid);
     event->namespaces.tid       = bswap_32(event->namespaces.tid);
     event->namespaces.nr_namespaces = bswap_64(event->namespaces.nr_namespaces);
 
     for (i = 0; i < event->namespaces.nr_namespaces; i++) {
         struct perf_ns_link_info *ns = &event->namespaces.link_info[i];
 
         ns->dev = bswap_64(ns->dev);
         ns->ino = bswap_64(ns->ino);
     }
 
     if (sample_id_all)
         swap_sample_id_all(event, &event->namespaces.link_info[i]);
 }
 
 static void perf_event__cgroup_swap(union perf_event *event, bool sample_id_all)
 {
     event->cgroup.id = bswap_64(event->cgroup.id);
 
     if (sample_id_all) {
         void *data = &event->cgroup.path;
 
         data += PERF_ALIGN(strlen(data) + 1, sizeof(u64));
         swap_sample_id_all(event, data);
     }
 }
 
 static u8 revbyte(u8 b)
 {
     int rev = (b >> 4) | ((b & 0xf) << 4);
     rev = ((rev & 0xcc) >> 2) | ((rev & 0x33) << 2);
     rev = ((rev & 0xaa) >> 1) | ((rev & 0x55) << 1);
     return (u8) rev;
 }
 
 /*
  * XXX this is hack in attempt to carry flags bitfield
  * through endian village. ABI says:
  *
  * Bit-fields are allocated from right to left (least to most significant)
  * on little-endian implementations and from left to right (most to least
  * significant) on big-endian implementations.
  *
  * The above seems to be byte specific, so we need to reverse each
  * byte of the bitfield. 'Internet' also says this might be implementation
  * specific and we probably need proper fix and carry perf_event_attr
  * bitfield flags in separate data file FEAT_ section. Thought this seems
  * to work for now.
  */
 static void swap_bitfield(u8 *p, unsigned len)
 {
     unsigned i;
 
     for (i = 0; i < len; i++) {
         *p = revbyte(*p);
         p++;
     }
 }
 
 /* exported for swapping attributes in file header */
 void perf_event__attr_swap(struct perf_event_attr *attr)
 {
     attr->type      = bswap_32(attr->type);
     attr->size      = bswap_32(attr->size);
 
 #define bswap_safe(f, n)                    \
     (attr->size > (offsetof(struct perf_event_attr, f) +    \
                sizeof(attr->f) * (n)))
 #define bswap_field(f, sz)          \
 do {                        \
     if (bswap_safe(f, 0))           \
         attr->f = bswap_##sz(attr->f);  \
 } while(0)
 #define bswap_field_16(f) bswap_field(f, 16)
 #define bswap_field_32(f) bswap_field(f, 32)
 #define bswap_field_64(f) bswap_field(f, 64)
 
     bswap_field_64(config);
     bswap_field_64(sample_period);
     bswap_field_64(sample_type);
     bswap_field_64(read_format);
     bswap_field_32(wakeup_events);
     bswap_field_32(bp_type);
     bswap_field_64(bp_addr);
     bswap_field_64(bp_len);
     bswap_field_64(branch_sample_type);
     bswap_field_64(sample_regs_user);
     bswap_field_32(sample_stack_user);
     bswap_field_32(aux_watermark);
     bswap_field_16(sample_max_stack);
     bswap_field_32(aux_sample_size);
 
     /*
      * After read_format are bitfields. Check read_format because
      * we are unable to use offsetof on bitfield.
      */
     if (bswap_safe(read_format, 1))
         swap_bitfield((u8 *) (&attr->read_format + 1),
                   sizeof(u64));
 #undef bswap_field_64
 #undef bswap_field_32
 #undef bswap_field
 #undef bswap_safe
 }
 
 static void perf_event__hdr_attr_swap(union perf_event *event,
                       bool sample_id_all __maybe_unused)
 {
     size_t size;
 
     perf_event__attr_swap(&event->attr.attr);
 
     size = event->header.size;
     size -= (void *)&event->attr.id - (void *)event;
     mem_bswap_64(event->attr.id, size);
 }
 
 static void perf_event__event_update_swap(union perf_event *event,
                       bool sample_id_all __maybe_unused)
 {
     event->event_update.type = bswap_64(event->event_update.type);
     event->event_update.id   = bswap_64(event->event_update.id);
 }
 
 static void perf_event__event_type_swap(union perf_event *event,
                     bool sample_id_all __maybe_unused)
 {
     event->event_type.event_type.event_id =
         bswap_64(event->event_type.event_type.event_id);
 }
 
 static void perf_event__tracing_data_swap(union perf_event *event,
                       bool sample_id_all __maybe_unused)
 {
     event->tracing_data.size = bswap_32(event->tracing_data.size);
 }
 
 static void perf_event__auxtrace_info_swap(union perf_event *event,
                        bool sample_id_all __maybe_unused)
 {
     size_t size;
 
     event->auxtrace_info.type = bswap_32(event->auxtrace_info.type);
 
     size = event->header.size;
     size -= (void *)&event->auxtrace_info.priv - (void *)event;
     mem_bswap_64(event->auxtrace_info.priv, size);
 }
 
 static void perf_event__auxtrace_swap(union perf_event *event,
                       bool sample_id_all __maybe_unused)
 {
     event->auxtrace.size      = bswap_64(event->auxtrace.size);
     event->auxtrace.offset    = bswap_64(event->auxtrace.offset);
     event->auxtrace.reference = bswap_64(event->auxtrace.reference);
     event->auxtrace.idx       = bswap_32(event->auxtrace.idx);
     event->auxtrace.tid       = bswap_32(event->auxtrace.tid);
     event->auxtrace.cpu       = bswap_32(event->auxtrace.cpu);
 }
 
 static void perf_event__auxtrace_error_swap(union perf_event *event,
                         bool sample_id_all __maybe_unused)
 {
     event->auxtrace_error.type = bswap_32(event->auxtrace_error.type);
     event->auxtrace_error.code = bswap_32(event->auxtrace_error.code);
     event->auxtrace_error.cpu  = bswap_32(event->auxtrace_error.cpu);
     event->auxtrace_error.pid  = bswap_32(event->auxtrace_error.pid);
     event->auxtrace_error.tid  = bswap_32(event->auxtrace_error.tid);
     event->auxtrace_error.fmt  = bswap_32(event->auxtrace_error.fmt);
     event->auxtrace_error.ip   = bswap_64(event->auxtrace_error.ip);
     if (event->auxtrace_error.fmt)
         event->auxtrace_error.time = bswap_64(event->auxtrace_error.time);
     if (event->auxtrace_error.fmt >= 2) {
         event->auxtrace_error.machine_pid = bswap_32(event->auxtrace_error.machine_pid);
         event->auxtrace_error.vcpu = bswap_32(event->auxtrace_error.vcpu);
     }
 }
 
 static void perf_event__thread_map_swap(union perf_event *event,
                     bool sample_id_all __maybe_unused)
 {
     unsigned i;
 
     event->thread_map.nr = bswap_64(event->thread_map.nr);
 
     for (i = 0; i < event->thread_map.nr; i++)
         event->thread_map.entries[i].pid = bswap_64(event->thread_map.entries[i].pid);
 }
 
 static void perf_event__cpu_map_swap(union perf_event *event,
                      bool sample_id_all __maybe_unused)
 {
     struct perf_record_cpu_map_data *data = &event->cpu_map.data;
 
     data->type = bswap_16(data->type);
 
     switch (data->type) {
     case PERF_CPU_MAP__CPUS:
         data->cpus_data.nr = bswap_16(data->cpus_data.nr);
 
         for (unsigned i = 0; i < data->cpus_data.nr; i++)
             data->cpus_data.cpu[i] = bswap_16(data->cpus_data.cpu[i]);
         break;
     case PERF_CPU_MAP__MASK:
         data->mask32_data.long_size = bswap_16(data->mask32_data.long_size);
 
         switch (data->mask32_data.long_size) {
         case 4:
             data->mask32_data.nr = bswap_16(data->mask32_data.nr);
             for (unsigned i = 0; i < data->mask32_data.nr; i++)
                 data->mask32_data.mask[i] = bswap_32(data->mask32_data.mask[i]);
             break;
         case 8:
             data->mask64_data.nr = bswap_16(data->mask64_data.nr);
             for (unsigned i = 0; i < data->mask64_data.nr; i++)
                 data->mask64_data.mask[i] = bswap_64(data->mask64_data.mask[i]);
             break;
         default:
             pr_err("cpu_map swap: unsupported long size\n");
         }
     default:
         break;
     }
 }
 
 static void perf_event__stat_config_swap(union perf_event *event,
                      bool sample_id_all __maybe_unused)
 {
     u64 size;
 
     size  = bswap_64(event->stat_config.nr) * sizeof(event->stat_config.data[0]);
     size += 1; /* nr item itself */
     mem_bswap_64(&event->stat_config.nr, size);
 }
 
 static void perf_event__stat_swap(union perf_event *event,
                   bool sample_id_all __maybe_unused)
 {
     event->stat.id     = bswap_64(event->stat.id);
     event->stat.thread = bswap_32(event->stat.thread);
     event->stat.cpu    = bswap_32(event->stat.cpu);
     event->stat.val    = bswap_64(event->stat.val);
     event->stat.ena    = bswap_64(event->stat.ena);
     event->stat.run    = bswap_64(event->stat.run);
 }
 
 static void perf_event__stat_round_swap(union perf_event *event,
                     bool sample_id_all __maybe_unused)
 {
     event->stat_round.type = bswap_64(event->stat_round.type);
     event->stat_round.time = bswap_64(event->stat_round.time);
 }
 
 static void perf_event__time_conv_swap(union perf_event *event,
                        bool sample_id_all __maybe_unused)
 {
     event->time_conv.time_shift = bswap_64(event->time_conv.time_shift);
     event->time_conv.time_mult  = bswap_64(event->time_conv.time_mult);
     event->time_conv.time_zero  = bswap_64(event->time_conv.time_zero);
 
     if (event_contains(event->time_conv, time_cycles)) {
         event->time_conv.time_cycles = bswap_64(event->time_conv.time_cycles);
         event->time_conv.time_mask = bswap_64(event->time_conv.time_mask);
     }
 }
 
 typedef void (*perf_event__swap_op)(union perf_event *event,
                     bool sample_id_all);
 
 static perf_event__swap_op perf_event__swap_ops[] = {
     [PERF_RECORD_MMAP]        = perf_event__mmap_swap,
     [PERF_RECORD_MMAP2]       = perf_event__mmap2_swap,
     [PERF_RECORD_COMM]        = perf_event__comm_swap,
     [PERF_RECORD_FORK]        = perf_event__task_swap,
     [PERF_RECORD_EXIT]        = perf_event__task_swap,
     [PERF_RECORD_LOST]        = perf_event__all64_swap,
     [PERF_RECORD_READ]        = perf_event__read_swap,
     [PERF_RECORD_THROTTLE]        = perf_event__throttle_swap,
     [PERF_RECORD_UNTHROTTLE]      = perf_event__throttle_swap,
     [PERF_RECORD_SAMPLE]          = perf_event__all64_swap,
     [PERF_RECORD_AUX]         = perf_event__aux_swap,
     [PERF_RECORD_ITRACE_START]    = perf_event__itrace_start_swap,
     [PERF_RECORD_LOST_SAMPLES]    = perf_event__all64_swap,
     [PERF_RECORD_SWITCH]          = perf_event__switch_swap,
     [PERF_RECORD_SWITCH_CPU_WIDE]     = perf_event__switch_swap,
     [PERF_RECORD_NAMESPACES]      = perf_event__namespaces_swap,
     [PERF_RECORD_CGROUP]          = perf_event__cgroup_swap,
     [PERF_RECORD_TEXT_POKE]       = perf_event__text_poke_swap,
     [PERF_RECORD_AUX_OUTPUT_HW_ID]    = perf_event__all64_swap,
     [PERF_RECORD_HEADER_ATTR]     = perf_event__hdr_attr_swap,
     [PERF_RECORD_HEADER_EVENT_TYPE]   = perf_event__event_type_swap,
     [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap,
     [PERF_RECORD_HEADER_BUILD_ID]     = NULL,
     [PERF_RECORD_ID_INDEX]        = perf_event__all64_swap,
     [PERF_RECORD_AUXTRACE_INFO]   = perf_event__auxtrace_info_swap,
     [PERF_RECORD_AUXTRACE]        = perf_event__auxtrace_swap,
     [PERF_RECORD_AUXTRACE_ERROR]      = perf_event__auxtrace_error_swap,
     [PERF_RECORD_THREAD_MAP]      = perf_event__thread_map_swap,
     [PERF_RECORD_CPU_MAP]         = perf_event__cpu_map_swap,
     [PERF_RECORD_STAT_CONFIG]     = perf_event__stat_config_swap,
     [PERF_RECORD_STAT]        = perf_event__stat_swap,
     [PERF_RECORD_STAT_ROUND]      = perf_event__stat_round_swap,
     [PERF_RECORD_EVENT_UPDATE]    = perf_event__event_update_swap,
     [PERF_RECORD_TIME_CONV]       = perf_event__time_conv_swap,
     [PERF_RECORD_HEADER_MAX]      = NULL,
 };
 
 /*
  * When perf record finishes a pass on every buffers, it records this pseudo
  * event.
  * We record the max timestamp t found in the pass n.
  * Assuming these timestamps are monotonic across cpus, we know that if
  * a buffer still has events with timestamps below t, they will be all
  * available and then read in the pass n + 1.
  * Hence when we start to read the pass n + 2, we can safely flush every
  * events with timestamps below t.
  *
  *    ============ PASS n =================
  *       CPU 0         |   CPU 1
  *                     |
  *    cnt1 timestamps  |   cnt2 timestamps
  *          1          |         2
  *          2          |         3
  *          -          |         4  <--- max recorded
  *
  *    ============ PASS n + 1 ==============
  *       CPU 0         |   CPU 1
  *                     |
  *    cnt1 timestamps  |   cnt2 timestamps
  *          3          |         5
  *          4          |         6
  *          5          |         7 <---- max recorded
  *
  *      Flush every events below timestamp 4
  *
  *    ============ PASS n + 2 ==============
  *       CPU 0         |   CPU 1
  *                     |
  *    cnt1 timestamps  |   cnt2 timestamps
  *          6          |         8
  *          7          |         9
  *          -          |         10
  *
  *      Flush every events below timestamp 7
  *      etc...
  */
 int perf_event__process_finished_round(struct perf_tool *tool __maybe_unused,
                        union perf_event *event __maybe_unused,
                        struct ordered_events *oe)
 {
     if (dump_trace)
         fprintf(stdout, "\n");
     return ordered_events__flush(oe, OE_FLUSH__ROUND);
 }
 
 int perf_session__queue_event(struct perf_session *s, union perf_event *event,
                   u64 timestamp, u64 file_offset, const char *file_path)
 {
     return ordered_events__queue(&s->ordered_events, event, timestamp, file_offset, file_path);
 }
 
 static void callchain__lbr_callstack_printf(struct perf_sample *sample)
 {
     struct ip_callchain *callchain = sample->callchain;
     struct branch_stack *lbr_stack = sample->branch_stack;
     struct branch_entry *entries = perf_sample__branch_entries(sample);
     u64 kernel_callchain_nr = callchain->nr;
     unsigned int i;
 
     for (i = 0; i < kernel_callchain_nr; i++) {
         if (callchain->ips[i] == PERF_CONTEXT_USER)
             break;
     }
 
     if ((i != kernel_callchain_nr) && lbr_stack->nr) {
         u64 total_nr;
         /*
          * LBR callstack can only get user call chain,
          * i is kernel call chain number,
          * 1 is PERF_CONTEXT_USER.
          *
          * The user call chain is stored in LBR registers.
          * LBR are pair registers. The caller is stored
          * in "from" register, while the callee is stored
          * in "to" register.
          * For example, there is a call stack
          * "A"->"B"->"C"->"D".
          * The LBR registers will be recorded like
          * "C"->"D", "B"->"C", "A"->"B".
          * So only the first "to" register and all "from"
          * registers are needed to construct the whole stack.
          */
         total_nr = i + 1 + lbr_stack->nr + 1;
         kernel_callchain_nr = i + 1;
 
         printf("... LBR call chain: nr:%" PRIu64 "\n", total_nr);
 
         for (i = 0; i < kernel_callchain_nr; i++)
             printf("..... %2d: %016" PRIx64 "\n",
                    i, callchain->ips[i]);
 
         printf("..... %2d: %016" PRIx64 "\n",
                (int)(kernel_callchain_nr), entries[0].to);
         for (i = 0; i < lbr_stack->nr; i++)
             printf("..... %2d: %016" PRIx64 "\n",
                    (int)(i + kernel_callchain_nr + 1), entries[i].from);
     }
 }
 
 static void callchain__printf(struct evsel *evsel,
                   struct perf_sample *sample)
 {
     unsigned int i;
     struct ip_callchain *callchain = sample->callchain;
 
     if (evsel__has_branch_callstack(evsel))
         callchain__lbr_callstack_printf(sample);
 
     printf("... FP chain: nr:%" PRIu64 "\n", callchain->nr);
 
     for (i = 0; i < callchain->nr; i++)
         printf("..... %2d: %016" PRIx64 "\n",
                i, callchain->ips[i]);
 }
 
 static void branch_stack__printf(struct perf_sample *sample, bool callstack)
 {
     struct branch_entry *entries = perf_sample__branch_entries(sample);
     uint64_t i;
 
     if (!callstack) {
         printf("%s: nr:%" PRIu64 "\n", "... branch stack", sample->branch_stack->nr);
     } else {
         /* the reason of adding 1 to nr is because after expanding
          * branch stack it generates nr + 1 callstack records. e.g.,
          *         B()->C()
          *         A()->B()
          * the final callstack should be:
          *         C()
          *         B()
          *         A()
          */
         printf("%s: nr:%" PRIu64 "\n", "... branch callstack", sample->branch_stack->nr+1);
     }
 
     for (i = 0; i < sample->branch_stack->nr; i++) {
         struct branch_entry *e = &entries[i];
 
         if (!callstack) {
             printf("..... %2"PRIu64": %016" PRIx64 " -> %016" PRIx64 " %hu cycles %s%s%s%s %x %s\n",
                 i, e->from, e->to,
                 (unsigned short)e->flags.cycles,
                 e->flags.mispred ? "M" : " ",
                 e->flags.predicted ? "P" : " ",
                 e->flags.abort ? "A" : " ",
                 e->flags.in_tx ? "T" : " ",
                 (unsigned)e->flags.reserved,
                 e->flags.type ? branch_type_name(e->flags.type) : "");
         } else {
             if (i == 0) {
                 printf("..... %2"PRIu64": %016" PRIx64 "\n"
                        "..... %2"PRIu64": %016" PRIx64 "\n",
                         i, e->to, i+1, e->from);
             } else {
                 printf("..... %2"PRIu64": %016" PRIx64 "\n", i+1, e->from);
             }
         }
     }
 }
 
 static void regs_dump__printf(u64 mask, u64 *regs, const char *arch)
 {
     unsigned rid, i = 0;
 
     for_each_set_bit(rid, (unsigned long *) &mask, sizeof(mask) * 8) {
         u64 val = regs[i++];
 
         printf(".... %-5s 0x%016" PRIx64 "\n",
                perf_reg_name(rid, arch), val);
     }
 }
 
 static const char *regs_abi[] = {
     [PERF_SAMPLE_REGS_ABI_NONE] = "none",
     [PERF_SAMPLE_REGS_ABI_32] = "32-bit",
     [PERF_SAMPLE_REGS_ABI_64] = "64-bit",
 };
 
 static inline const char *regs_dump_abi(struct regs_dump *d)
 {
     if (d->abi > PERF_SAMPLE_REGS_ABI_64)
         return "unknown";
 
     return regs_abi[d->abi];
 }
 
 static void regs__printf(const char *type, struct regs_dump *regs, const char *arch)
 {
     u64 mask = regs->mask;
 
     printf("... %s regs: mask 0x%" PRIx64 " ABI %s\n",
            type,
            mask,
            regs_dump_abi(regs));
 
     regs_dump__printf(mask, regs->regs, arch);
 }
 
 static void regs_user__printf(struct perf_sample *sample, const char *arch)
 {
     struct regs_dump *user_regs = &sample->user_regs;
 
     if (user_regs->regs)
         regs__printf("user", user_regs, arch);
 }
 
 static void regs_intr__printf(struct perf_sample *sample, const char *arch)
 {
     struct regs_dump *intr_regs = &sample->intr_regs;
 
     if (intr_regs->regs)
         regs__printf("intr", intr_regs, arch);
 }
 
 static void stack_user__printf(struct stack_dump *dump)
 {
     printf("... ustack: size %" PRIu64 ", offset 0x%x\n",
            dump->size, dump->offset);
 }
 
 static void evlist__print_tstamp(struct evlist *evlist, union perf_event *event, struct perf_sample *sample)
 {
     u64 sample_type = __evlist__combined_sample_type(evlist);
 
     if (event->header.type != PERF_RECORD_SAMPLE &&
         !evlist__sample_id_all(evlist)) {
         fputs("-1 -1 ", stdout);
         return;
     }
 
     if ((sample_type & PERF_SAMPLE_CPU))
         printf("%u ", sample->cpu);
 
     if (sample_type & PERF_SAMPLE_TIME)
         printf("%" PRIu64 " ", sample->time);
 }
 
 static void sample_read__printf(struct perf_sample *sample, u64 read_format)
 {
     printf("... sample_read:\n");
 
     if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
         printf("...... time enabled %016" PRIx64 "\n",
                sample->read.time_enabled);
 
     if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
         printf("...... time running %016" PRIx64 "\n",
                sample->read.time_running);
 
     if (read_format & PERF_FORMAT_GROUP) {
         struct sample_read_value *value = sample->read.group.values;
 
         printf(".... group nr %" PRIu64 "\n", sample->read.group.nr);
 
         sample_read_group__for_each(value, sample->read.group.nr, read_format) {
             printf("..... id %016" PRIx64
                    ", value %016" PRIx64,
                    value->id, value->value);
             if (read_format & PERF_FORMAT_LOST)
                 printf(", lost %" PRIu64, value->lost);
             printf("\n");
         }
     } else {
         printf("..... id %016" PRIx64 ", value %016" PRIx64,
             sample->read.one.id, sample->read.one.value);
         if (read_format & PERF_FORMAT_LOST)
             printf(", lost %" PRIu64, sample->read.one.lost);
         printf("\n");
     }
 }
 
 static void dump_event(struct evlist *evlist, union perf_event *event,
                u64 file_offset, struct perf_sample *sample,
                const char *file_path)
 {
     if (!dump_trace)
         return;
 
     printf("\n%#" PRIx64 "@%s [%#x]: event: %d\n",
            file_offset, file_path, event->header.size, event->header.type);
 
     trace_event(event);
     if (event->header.type == PERF_RECORD_SAMPLE && evlist->trace_event_sample_raw)
         evlist->trace_event_sample_raw(evlist, event, sample);
 
     if (sample)
         evlist__print_tstamp(evlist, event, sample);
 
     printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset,
            event->header.size, perf_event__name(event->header.type));
 }
 
 char *get_page_size_name(u64 size, char *str)
 {
     if (!size || !unit_number__scnprintf(str, PAGE_SIZE_NAME_LEN, size))
         snprintf(str, PAGE_SIZE_NAME_LEN, "%s", "N/A");
 
     return str;
 }
 
 static void dump_sample(struct evsel *evsel, union perf_event *event,
             struct perf_sample *sample, const char *arch)
 {
     u64 sample_type;
     char str[PAGE_SIZE_NAME_LEN];
 
     if (!dump_trace)
         return;
 
     printf("(IP, 0x%x): %d/%d: %#" PRIx64 " period: %" PRIu64 " addr: %#" PRIx64 "\n",
            event->header.misc, sample->pid, sample->tid, sample->ip,
            sample->period, sample->addr);
 
     sample_type = evsel->core.attr.sample_type;
 
     if (evsel__has_callchain(evsel))
         callchain__printf(evsel, sample);
 
     if (evsel__has_br_stack(evsel))
         branch_stack__printf(sample, evsel__has_branch_callstack(evsel));
 
     if (sample_type & PERF_SAMPLE_REGS_USER)
         regs_user__printf(sample, arch);
 
     if (sample_type & PERF_SAMPLE_REGS_INTR)
         regs_intr__printf(sample, arch);
 
     if (sample_type & PERF_SAMPLE_STACK_USER)
         stack_user__printf(&sample->user_stack);
 
     if (sample_type & PERF_SAMPLE_WEIGHT_TYPE) {
         printf("... weight: %" PRIu64 "", sample->weight);
             if (sample_type & PERF_SAMPLE_WEIGHT_STRUCT) {
                 printf(",0x%"PRIx16"", sample->ins_lat);
                 printf(",0x%"PRIx16"", sample->p_stage_cyc);
             }
         printf("\n");
     }
 
     if (sample_type & PERF_SAMPLE_DATA_SRC)
         printf(" . data_src: 0x%"PRIx64"\n", sample->data_src);
 
     if (sample_type & PERF_SAMPLE_PHYS_ADDR)
         printf(" .. phys_addr: 0x%"PRIx64"\n", sample->phys_addr);
 
     if (sample_type & PERF_SAMPLE_DATA_PAGE_SIZE)
         printf(" .. data page size: %s\n", get_page_size_name(sample->data_page_size, str));
 
     if (sample_type & PERF_SAMPLE_CODE_PAGE_SIZE)
         printf(" .. code page size: %s\n", get_page_size_name(sample->code_page_size, str));
 
     if (sample_type & PERF_SAMPLE_TRANSACTION)
         printf("... transaction: %" PRIx64 "\n", sample->transaction);
 
     if (sample_type & PERF_SAMPLE_READ)
         sample_read__printf(sample, evsel->core.attr.read_format);
 }
 
 static void dump_read(struct evsel *evsel, union perf_event *event)
 {
     struct perf_record_read *read_event = &event->read;
     u64 read_format;
 
     if (!dump_trace)
         return;
 
     printf(": %d %d %s %" PRI_lu64 "\n", event->read.pid, event->read.tid,
            evsel__name(evsel), event->read.value);
 
     if (!evsel)
         return;
 
     read_format = evsel->core.attr.read_format;
 
     if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
         printf("... time enabled : %" PRI_lu64 "\n", read_event->time_enabled);
 
     if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
         printf("... time running : %" PRI_lu64 "\n", read_event->time_running);
 
     if (read_format & PERF_FORMAT_ID)
         printf("... id           : %" PRI_lu64 "\n", read_event->id);
 
     if (read_format & PERF_FORMAT_LOST)
         printf("... lost         : %" PRI_lu64 "\n", read_event->lost);
 }
 
 static struct machine *machines__find_for_cpumode(struct machines *machines,
                            union perf_event *event,
                            struct perf_sample *sample)
 {
     if (perf_guest &&
         ((sample->cpumode == PERF_RECORD_MISC_GUEST_KERNEL) ||
          (sample->cpumode == PERF_RECORD_MISC_GUEST_USER))) {
         u32 pid;
 
         if (sample->machine_pid)
             pid = sample->machine_pid;
         else if (event->header.type == PERF_RECORD_MMAP
             || event->header.type == PERF_RECORD_MMAP2)
             pid = event->mmap.pid;
         else
             pid = sample->pid;
 
         /*
          * Guest code machine is created as needed and does not use
          * DEFAULT_GUEST_KERNEL_ID.
          */
         if (symbol_conf.guest_code)
             return machines__findnew(machines, pid);
 
         return machines__find_guest(machines, pid);
     }
 
     return &machines->host;
 }
 
 static int deliver_sample_value(struct evlist *evlist,
                 struct perf_tool *tool,
                 union perf_event *event,
                 struct perf_sample *sample,
                 struct sample_read_value *v,
                 struct machine *machine)
 {
     struct perf_sample_id *sid = evlist__id2sid(evlist, v->id);
     struct evsel *evsel;
 
     if (sid) {
         sample->id     = v->id;
         sample->period = v->value - sid->period;
         sid->period    = v->value;
     }
 
     if (!sid || sid->evsel == NULL) {
         ++evlist->stats.nr_unknown_id;
         return 0;
     }
 
     /*
      * There's no reason to deliver sample
      * for zero period, bail out.
      */
     if (!sample->period)
         return 0;
 
     evsel = container_of(sid->evsel, struct evsel, core);
     return tool->sample(tool, event, sample, evsel, machine);
 }
 
 static int deliver_sample_group(struct evlist *evlist,
                 struct perf_tool *tool,
                 union  perf_event *event,
                 struct perf_sample *sample,
                 struct machine *machine,
                 u64 read_format)
 {
     int ret = -EINVAL;
     struct sample_read_value *v = sample->read.group.values;
 
     sample_read_group__for_each(v, sample->read.group.nr, read_format) {
         ret = deliver_sample_value(evlist, tool, event, sample, v,
                        machine);
         if (ret)
             break;
     }
 
     return ret;
 }
 
 static int evlist__deliver_sample(struct evlist *evlist, struct perf_tool *tool,
                   union  perf_event *event, struct perf_sample *sample,
                   struct evsel *evsel, struct machine *machine)
 {
     /* We know evsel != NULL. */
     u64 sample_type = evsel->core.attr.sample_type;
     u64 read_format = evsel->core.attr.read_format;
 
     /* Standard sample delivery. */
     if (!(sample_type & PERF_SAMPLE_READ))
         return tool->sample(tool, event, sample, evsel, machine);
 
     /* For PERF_SAMPLE_READ we have either single or group mode. */
     if (read_format & PERF_FORMAT_GROUP)
         return deliver_sample_group(evlist, tool, event, sample,
                         machine, read_format);
     else
         return deliver_sample_value(evlist, tool, event, sample,
                         &sample->read.one, machine);
 }
 
 static int machines__deliver_event(struct machines *machines,
                    struct evlist *evlist,
                    union perf_event *event,
                    struct perf_sample *sample,
                    struct perf_tool *tool, u64 file_offset,
                    const char *file_path)
 {
     struct evsel *evsel;
     struct machine *machine;
 
     dump_event(evlist, event, file_offset, sample, file_path);
 
     evsel = evlist__id2evsel(evlist, sample->id);
 
     machine = machines__find_for_cpumode(machines, event, sample);
 
     switch (event->header.type) {
     case PERF_RECORD_SAMPLE:
         if (evsel == NULL) {
             ++evlist->stats.nr_unknown_id;
             return 0;
         }
         if (machine == NULL) {
             ++evlist->stats.nr_unprocessable_samples;
             dump_sample(evsel, event, sample, perf_env__arch(NULL));
             return 0;
         }
         dump_sample(evsel, event, sample, perf_env__arch(machine->env));
         return evlist__deliver_sample(evlist, tool, event, sample, evsel, machine);
     case PERF_RECORD_MMAP:
         return tool->mmap(tool, event, sample, machine);
     case PERF_RECORD_MMAP2:
         if (event->header.misc & PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT)
             ++evlist->stats.nr_proc_map_timeout;
         return tool->mmap2(tool, event, sample, machine);
     case PERF_RECORD_COMM:
         return tool->comm(tool, event, sample, machine);
     case PERF_RECORD_NAMESPACES:
         return tool->namespaces(tool, event, sample, machine);
     case PERF_RECORD_CGROUP:
         return tool->cgroup(tool, event, sample, machine);
     case PERF_RECORD_FORK:
         return tool->fork(tool, event, sample, machine);
     case PERF_RECORD_EXIT:
         return tool->exit(tool, event, sample, machine);
     case PERF_RECORD_LOST:
         if (tool->lost == perf_event__process_lost)
             evlist->stats.total_lost += event->lost.lost;
         return tool->lost(tool, event, sample, machine);
     case PERF_RECORD_LOST_SAMPLES:
         if (tool->lost_samples == perf_event__process_lost_samples)
             evlist->stats.total_lost_samples += event->lost_samples.lost;
         return tool->lost_samples(tool, event, sample, machine);
     case PERF_RECORD_READ:
         dump_read(evsel, event);
         return tool->read(tool, event, sample, evsel, machine);
     case PERF_RECORD_THROTTLE:
         return tool->throttle(tool, event, sample, machine);
     case PERF_RECORD_UNTHROTTLE:
         return tool->unthrottle(tool, event, sample, machine);
     case PERF_RECORD_AUX:
         if (tool->aux == perf_event__process_aux) {
             if (event->aux.flags & PERF_AUX_FLAG_TRUNCATED)
                 evlist->stats.total_aux_lost += 1;
             if (event->aux.flags & PERF_AUX_FLAG_PARTIAL)
                 evlist->stats.total_aux_partial += 1;
             if (event->aux.flags & PERF_AUX_FLAG_COLLISION)
                 evlist->stats.total_aux_collision += 1;
         }
         return tool->aux(tool, event, sample, machine);
     case PERF_RECORD_ITRACE_START:
         return tool->itrace_start(tool, event, sample, machine);
     case PERF_RECORD_SWITCH:
     case PERF_RECORD_SWITCH_CPU_WIDE:
         return tool->context_switch(tool, event, sample, machine);
     case PERF_RECORD_KSYMBOL:
         return tool->ksymbol(tool, event, sample, machine);
     case PERF_RECORD_BPF_EVENT:
         return tool->bpf(tool, event, sample, machine);
     case PERF_RECORD_TEXT_POKE:
         return tool->text_poke(tool, event, sample, machine);
     case PERF_RECORD_AUX_OUTPUT_HW_ID:
         return tool->aux_output_hw_id(tool, event, sample, machine);
     default:
         ++evlist->stats.nr_unknown_events;
         return -1;
     }
 }
 
 static int perf_session__deliver_event(struct perf_session *session,
                        union perf_event *event,
                        struct perf_tool *tool,
                        u64 file_offset,
                        const char *file_path)
 {
     struct perf_sample sample;
     int ret = evlist__parse_sample(session->evlist, event, &sample);
 
     if (ret) {
         pr_err("Can't parse sample, err = %d\n", ret);
         return ret;
     }
 
     ret = auxtrace__process_event(session, event, &sample, tool);
     if (ret < 0)
         return ret;
     if (ret > 0)
         return 0;
 
     ret = machines__deliver_event(&session->machines, session->evlist,
                       event, &sample, tool, file_offset, file_path);
 
     if (dump_trace && sample.aux_sample.size)
         auxtrace__dump_auxtrace_sample(session, &sample);
 
     return ret;
 }
 
 static s64 perf_session__process_user_event(struct perf_session *session,
                         union perf_event *event,
                         u64 file_offset,
                         const char *file_path)
 {
     struct ordered_events *oe = &session->ordered_events;
     struct perf_tool *tool = session->tool;
     struct perf_sample sample = { .time = 0, };
     int fd = perf_data__fd(session->data);
     int err;
 
     if (event->header.type != PERF_RECORD_COMPRESSED ||
         tool->compressed == perf_session__process_compressed_event_stub)
         dump_event(session->evlist, event, file_offset, &sample, file_path);
 
     /* These events are processed right away */
     switch (event->header.type) {
     case PERF_RECORD_HEADER_ATTR:
         err = tool->attr(tool, event, &session->evlist);
         if (err == 0) {
             perf_session__set_id_hdr_size(session);
             perf_session__set_comm_exec(session);
         }
         return err;
     case PERF_RECORD_EVENT_UPDATE:
         return tool->event_update(tool, event, &session->evlist);
     case PERF_RECORD_HEADER_EVENT_TYPE:
         /*
          * Deprecated, but we need to handle it for sake
          * of old data files create in pipe mode.
          */
         return 0;
     case PERF_RECORD_HEADER_TRACING_DATA:
         /*
          * Setup for reading amidst mmap, but only when we
          * are in 'file' mode. The 'pipe' fd is in proper
          * place already.
          */
         if (!perf_data__is_pipe(session->data))
             lseek(fd, file_offset, SEEK_SET);
         return tool->tracing_data(session, event);
     case PERF_RECORD_HEADER_BUILD_ID:
         return tool->build_id(session, event);
     case PERF_RECORD_FINISHED_ROUND:
         return tool->finished_round(tool, event, oe);
     case PERF_RECORD_ID_INDEX:
         return tool->id_index(session, event);
     case PERF_RECORD_AUXTRACE_INFO:
         return tool->auxtrace_info(session, event);
     case PERF_RECORD_AUXTRACE:
         /* setup for reading amidst mmap */
         lseek(fd, file_offset + event->header.size, SEEK_SET);
         return tool->auxtrace(session, event);
     case PERF_RECORD_AUXTRACE_ERROR:
         perf_session__auxtrace_error_inc(session, event);
         return tool->auxtrace_error(session, event);
     case PERF_RECORD_THREAD_MAP:
         return tool->thread_map(session, event);
     case PERF_RECORD_CPU_MAP:
         return tool->cpu_map(session, event);
     case PERF_RECORD_STAT_CONFIG:
         return tool->stat_config(session, event);
     case PERF_RECORD_STAT:
         return tool->stat(session, event);
     case PERF_RECORD_STAT_ROUND:
         return tool->stat_round(session, event);
     case PERF_RECORD_TIME_CONV:
         session->time_conv = event->time_conv;
         return tool->time_conv(session, event);
     case PERF_RECORD_HEADER_FEATURE:
         return tool->feature(session, event);
     case PERF_RECORD_COMPRESSED:
         err = tool->compressed(session, event, file_offset, file_path);
         if (err)
             dump_event(session->evlist, event, file_offset, &sample, file_path);
         return err;
     case PERF_RECORD_FINISHED_INIT:
         return tool->finished_init(session, event);
     default:
         return -EINVAL;
     }
 }
 
 int perf_session__deliver_synth_event(struct perf_session *session,
                       union perf_event *event,
                       struct perf_sample *sample)
 {
     struct evlist *evlist = session->evlist;
     struct perf_tool *tool = session->tool;
 
     events_stats__inc(&evlist->stats, event->header.type);
 
     if (event->header.type >= PERF_RECORD_USER_TYPE_START)
         return perf_session__process_user_event(session, event, 0, NULL);
 
     return machines__deliver_event(&session->machines, evlist, event, sample, tool, 0, NULL);
 }
 
 static void event_swap(union perf_event *event, bool sample_id_all)
 {
     perf_event__swap_op swap;
 
     swap = perf_event__swap_ops[event->header.type];
     if (swap)
         swap(event, sample_id_all);
 }
 
 int perf_session__peek_event(struct perf_session *session, off_t file_offset,
                  void *buf, size_t buf_sz,
                  union perf_event **event_ptr,
                  struct perf_sample *sample)
 {
     union perf_event *event;
     size_t hdr_sz, rest;
     int fd;
 
     if (session->one_mmap && !session->header.needs_swap) {
         event = file_offset - session->one_mmap_offset +
             session->one_mmap_addr;
         goto out_parse_sample;
     }
 
     if (perf_data__is_pipe(session->data))
         return -1;
 
     fd = perf_data__fd(session->data);
     hdr_sz = sizeof(struct perf_event_header);
 
     if (buf_sz < hdr_sz)
         return -1;
 
     if (lseek(fd, file_offset, SEEK_SET) == (off_t)-1 ||
         readn(fd, buf, hdr_sz) != (ssize_t)hdr_sz)
         return -1;
 
     event = (union perf_event *)buf;
 
     if (session->header.needs_swap)
         perf_event_header__bswap(&event->header);
 
     if (event->header.size < hdr_sz || event->header.size > buf_sz)
         return -1;
 
     buf += hdr_sz;
     rest = event->header.size - hdr_sz;
 
     if (readn(fd, buf, rest) != (ssize_t)rest)
         return -1;
 
     if (session->header.needs_swap)
         event_swap(event, evlist__sample_id_all(session->evlist));
 
 out_parse_sample:
 
     if (sample && event->header.type < PERF_RECORD_USER_TYPE_START &&
         evlist__parse_sample(session->evlist, event, sample))
         return -1;
 
     *event_ptr = event;
 
     return 0;
 }
 
 int perf_session__peek_events(struct perf_session *session, u64 offset,
                   u64 size, peek_events_cb_t cb, void *data)
 {
     u64 max_offset = offset + size;
     char buf[PERF_SAMPLE_MAX_SIZE];
     union perf_event *event;
     int err;
 
     do {
         err = perf_session__peek_event(session, offset, buf,
                            PERF_SAMPLE_MAX_SIZE, &event,
                            NULL);
         if (err)
             return err;
 
         err = cb(session, event, offset, data);
         if (err)
             return err;
 
         offset += event->header.size;
         if (event->header.type == PERF_RECORD_AUXTRACE)
             offset += event->auxtrace.size;
 
     } while (offset < max_offset);
 
     return err;
 }
 
 static s64 perf_session__process_event(struct perf_session *session,
                        union perf_event *event, u64 file_offset,
                        const char *file_path)
 {
     struct evlist *evlist = session->evlist;
     struct perf_tool *tool = session->tool;
     int ret;
 
     if (session->header.needs_swap)
         event_swap(event, evlist__sample_id_all(evlist));
 
     if (event->header.type >= PERF_RECORD_HEADER_MAX)
         return -EINVAL;
 
     events_stats__inc(&evlist->stats, event->header.type);
 
     if (event->header.type >= PERF_RECORD_USER_TYPE_START)
         return perf_session__process_user_event(session, event, file_offset, file_path);
 
     if (tool->ordered_events) {
         u64 timestamp = -1ULL;
 
         ret = evlist__parse_sample_timestamp(evlist, event, &timestamp);
         if (ret && ret != -1)
             return ret;
 
         ret = perf_session__queue_event(session, event, timestamp, file_offset, file_path);
         if (ret != -ETIME)
             return ret;
     }
 
     return perf_session__deliver_event(session, event, tool, file_offset, file_path);
 }
 
 void perf_event_header__bswap(struct perf_event_header *hdr)
 {
     hdr->type = bswap_32(hdr->type);
     hdr->misc = bswap_16(hdr->misc);
     hdr->size = bswap_16(hdr->size);
 }
 
 struct thread *perf_session__findnew(struct perf_session *session, pid_t pid)
 {
     return machine__findnew_thread(&session->machines.host, -1, pid);
 }
 
 int perf_session__register_idle_thread(struct perf_session *session)
 {
     struct thread *thread = machine__idle_thread(&session->machines.host);
 
     /* machine__idle_thread() got the thread, so put it */
     thread__put(thread);
     return thread ? 0 : -1;
 }
 
 static void
 perf_session__warn_order(const struct perf_session *session)
 {
     const struct ordered_events *oe = &session->ordered_events;
     struct evsel *evsel;
     bool should_warn = true;
 
     evlist__for_each_entry(session->evlist, evsel) {
         if (evsel->core.attr.write_backward)
             should_warn = false;
     }
 
     if (!should_warn)
         return;
     if (oe->nr_unordered_events != 0)
         ui__warning("%u out of order events recorded.\n", oe->nr_unordered_events);
 }
 
 static void perf_session__warn_about_errors(const struct perf_session *session)
 {
     const struct events_stats *stats = &session->evlist->stats;
 
     if (session->tool->lost == perf_event__process_lost &&
         stats->nr_events[PERF_RECORD_LOST] != 0) {
         ui__warning("Processed %d events and lost %d chunks!\n\n"
                 "Check IO/CPU overload!\n\n",
                 stats->nr_events[0],
                 stats->nr_events[PERF_RECORD_LOST]);
     }
 
     if (session->tool->lost_samples == perf_event__process_lost_samples) {
         double drop_rate;
 
         drop_rate = (double)stats->total_lost_samples /
                 (double) (stats->nr_events[PERF_RECORD_SAMPLE] + stats->total_lost_samples);
         if (drop_rate > 0.05) {
             ui__warning("Processed %" PRIu64 " samples and lost %3.2f%%!\n\n",
                     stats->nr_events[PERF_RECORD_SAMPLE] + stats->total_lost_samples,
                     drop_rate * 100.0);
         }
     }
 
     if (session->tool->aux == perf_event__process_aux &&
         stats->total_aux_lost != 0) {
         ui__warning("AUX data lost %" PRIu64 " times out of %u!\n\n",
                 stats->total_aux_lost,
                 stats->nr_events[PERF_RECORD_AUX]);
     }
 
     if (session->tool->aux == perf_event__process_aux &&
         stats->total_aux_partial != 0) {
         bool vmm_exclusive = false;
 
         (void)sysfs__read_bool("module/kvm_intel/parameters/vmm_exclusive",
                                &vmm_exclusive);
 
         ui__warning("AUX data had gaps in it %" PRIu64 " times out of %u!\n\n"
                     "Are you running a KVM guest in the background?%s\n\n",
                 stats->total_aux_partial,
                 stats->nr_events[PERF_RECORD_AUX],
                 vmm_exclusive ?
                 "\nReloading kvm_intel module with vmm_exclusive=0\n"
                 "will reduce the gaps to only guest's timeslices." :
                 "");
     }
 
     if (session->tool->aux == perf_event__process_aux &&
         stats->total_aux_collision != 0) {
         ui__warning("AUX data detected collision  %" PRIu64 " times out of %u!\n\n",
                 stats->total_aux_collision,
                 stats->nr_events[PERF_RECORD_AUX]);
     }
 
     if (stats->nr_unknown_events != 0) {
         ui__warning("Found %u unknown events!\n\n"
                 "Is this an older tool processing a perf.data "
                 "file generated by a more recent tool?\n\n"
                 "If that is not the case, consider "
                 "reporting to linux-kernel@vger.kernel.org.\n\n",
                 stats->nr_unknown_events);
     }
 
     if (stats->nr_unknown_id != 0) {
         ui__warning("%u samples with id not present in the header\n",
                 stats->nr_unknown_id);
     }
 
     if (stats->nr_invalid_chains != 0) {
         ui__warning("Found invalid callchains!\n\n"
                 "%u out of %u events were discarded for this reason.\n\n"
                 "Consider reporting to linux-kernel@vger.kernel.org.\n\n",
                 stats->nr_invalid_chains,
                 stats->nr_events[PERF_RECORD_SAMPLE]);
     }
 
     if (stats->nr_unprocessable_samples != 0) {
         ui__warning("%u unprocessable samples recorded.\n"
                 "Do you have a KVM guest running and not using 'perf kvm'?\n",
                 stats->nr_unprocessable_samples);
     }
 
     perf_session__warn_order(session);
 
     events_stats__auxtrace_error_warn(stats);
 
     if (stats->nr_proc_map_timeout != 0) {
         ui__warning("%d map information files for pre-existing threads were\n"
                 "not processed, if there are samples for addresses they\n"
                 "will not be resolved, you may find out which are these\n"
                 "threads by running with -v and redirecting the output\n"
                 "to a file.\n"
                 "The time limit to process proc map is too short?\n"
                 "Increase it by --proc-map-timeout\n",
                 stats->nr_proc_map_timeout);
     }
 }
 
 static int perf_session__flush_thread_stack(struct thread *thread,
                         void *p __maybe_unused)
 {
     return thread_stack__flush(thread);
 }
 
 static int perf_session__flush_thread_stacks(struct perf_session *session)
 {
     return machines__for_each_thread(&session->machines,
                      perf_session__flush_thread_stack,
                      NULL);
 }
 
 volatile int session_done;
 
 static int __perf_session__process_decomp_events(struct perf_session *session);
 
 static int __perf_session__process_pipe_events(struct perf_session *session)
 {
     struct ordered_events *oe = &session->ordered_events;
     struct perf_tool *tool = session->tool;
     union perf_event *event;
     uint32_t size, cur_size = 0;
     void *buf = NULL;
     s64 skip = 0;
     u64 head;
     ssize_t err;
     void *p;
 
     perf_tool__fill_defaults(tool);
 
     head = 0;
     cur_size = sizeof(union perf_event);
 
     buf = malloc(cur_size);
     if (!buf)
         return -errno;
     ordered_events__set_copy_on_queue(oe, true);
 more:
     event = buf;
     err = perf_data__read(session->data, event,
                   sizeof(struct perf_event_header));
     if (err <= 0) {
         if (err == 0)
             goto done;
 
         pr_err("failed to read event header\n");
         goto out_err;
     }
 
     if (session->header.needs_swap)
         perf_event_header__bswap(&event->header);
 
     size = event->header.size;
     if (size < sizeof(struct perf_event_header)) {
         pr_err("bad event header size\n");
         goto out_err;
     }
 
     if (size > cur_size) {
         void *new = realloc(buf, size);
         if (!new) {
             pr_err("failed to allocate memory to read event\n");
             goto out_err;
         }
         buf = new;
         cur_size = size;
         event = buf;
     }
     p = event;
     p += sizeof(struct perf_event_header);
 
     if (size - sizeof(struct perf_event_header)) {
         err = perf_data__read(session->data, p,
                       size - sizeof(struct perf_event_header));
         if (err <= 0) {
             if (err == 0) {
                 pr_err("unexpected end of event stream\n");
                 goto done;
             }
 
             pr_err("failed to read event data\n");
             goto out_err;
         }
     }
 
     if ((skip = perf_session__process_event(session, event, head, "pipe")) < 0) {
         pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n",
                head, event->header.size, event->header.type);
         err = -EINVAL;
         goto out_err;
     }
 
     head += size;
 
     if (skip > 0)
         head += skip;
 
     err = __perf_session__process_decomp_events(session);
     if (err)
         goto out_err;
 
     if (!session_done())
         goto more;
 done:
     /* do the final flush for ordered samples */
     err = ordered_events__flush(oe, OE_FLUSH__FINAL);
     if (err)
         goto out_err;
     err = auxtrace__flush_events(session, tool);
     if (err)
         goto out_err;
     err = perf_session__flush_thread_stacks(session);
 out_err:
     free(buf);
     if (!tool->no_warn)
         perf_session__warn_about_errors(session);
     ordered_events__free(&session->ordered_events);
     auxtrace__free_events(session);
     return err;
 }
 
 static union perf_event *
 prefetch_event(char *buf, u64 head, size_t mmap_size,
            bool needs_swap, union perf_event *error)
 {
     union perf_event *event;
     u16 event_size;
 
     /*
      * Ensure we have enough space remaining to read
      * the size of the event in the headers.
      */
     if (head + sizeof(event->header) > mmap_size)
         return NULL;
 
     event = (union perf_event *)(buf + head);
     if (needs_swap)
         perf_event_header__bswap(&event->header);
 
     event_size = event->header.size;
     if (head + event_size <= mmap_size)
         return event;
 
     /* We're not fetching the event so swap back again */
     if (needs_swap)
         perf_event_header__bswap(&event->header);
 
     /* Check if the event fits into the next mmapped buf. */
     if (event_size <= mmap_size - head % page_size) {
         /* Remap buf and fetch again. */
         return NULL;
     }
 
     /* Invalid input. Event size should never exceed mmap_size. */
     pr_debug("%s: head=%#" PRIx64 " event->header.size=%#x, mmap_size=%#zx:"
          " fuzzed or compressed perf.data?\n", __func__, head, event_size, mmap_size);
 
     return error;
 }
 
 static union perf_event *
 fetch_mmaped_event(u64 head, size_t mmap_size, char *buf, bool needs_swap)
 {
     return prefetch_event(buf, head, mmap_size, needs_swap, ERR_PTR(-EINVAL));
 }
 
 static union perf_event *
 fetch_decomp_event(u64 head, size_t mmap_size, char *buf, bool needs_swap)
 {
     return prefetch_event(buf, head, mmap_size, needs_swap, NULL);
 }
 
 static int __perf_session__process_decomp_events(struct perf_session *session)
 {
     s64 skip;
     u64 size;
     struct decomp *decomp = session->active_decomp->decomp_last;
 
     if (!decomp)
         return 0;
 
     while (decomp->head < decomp->size && !session_done()) {
         union perf_event *event = fetch_decomp_event(decomp->head, decomp->size, decomp->data,
                                  session->header.needs_swap);
 
         if (!event)
             break;
 
         size = event->header.size;
 
         if (size < sizeof(struct perf_event_header) ||
             (skip = perf_session__process_event(session, event, decomp->file_pos,
                             decomp->file_path)) < 0) {
             pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n",
                 decomp->file_pos + decomp->head, event->header.size, event->header.type);
             return -EINVAL;
         }
 
         if (skip)
             size += skip;
 
         decomp->head += size;
     }
 
     return 0;
 }
 
 /*
  * On 64bit we can mmap the data file in one go. No need for tiny mmap
  * slices. On 32bit we use 32MB.
  */
 #if BITS_PER_LONG == 64
 #define MMAP_SIZE ULLONG_MAX
 #define NUM_MMAPS 1
 #else
 #define MMAP_SIZE (32 * 1024 * 1024ULL)
 #define NUM_MMAPS 128
 #endif
 
 struct reader;
 
 typedef s64 (*reader_cb_t)(struct perf_session *session,
                union perf_event *event,
                u64 file_offset,
                const char *file_path);
 
 struct reader {
     int      fd;
     const char   *path;
     u64      data_size;
     u64      data_offset;
     reader_cb_t  process;
     bool         in_place_update;
     char         *mmaps[NUM_MMAPS];
     size_t       mmap_size;
     int      mmap_idx;
     char         *mmap_cur;
     u64      file_pos;
     u64      file_offset;
     u64      head;
     u64      size;
     bool         done;
     struct zstd_data   zstd_data;
     struct decomp_data decomp_data;
 };
 
 static int
 reader__init(struct reader *rd, bool *one_mmap)
 {
     u64 data_size = rd->data_size;
     char **mmaps = rd->mmaps;
 
     rd->head = rd->data_offset;
     data_size += rd->data_offset;
 
     rd->mmap_size = MMAP_SIZE;
     if (rd->mmap_size > data_size) {
         rd->mmap_size = data_size;
         if (one_mmap)
             *one_mmap = true;
     }
 
     memset(mmaps, 0, sizeof(rd->mmaps));
 
     if (zstd_init(&rd->zstd_data, 0))
         return -1;
     rd->decomp_data.zstd_decomp = &rd->zstd_data;
 
     return 0;
 }
 
 static void
 reader__release_decomp(struct reader *rd)
 {
     perf_decomp__release_events(rd->decomp_data.decomp);
     zstd_fini(&rd->zstd_data);
 }
 
 static int
 reader__mmap(struct reader *rd, struct perf_session *session)
 {
     int mmap_prot, mmap_flags;
     char *buf, **mmaps = rd->mmaps;
     u64 page_offset;
 
     mmap_prot  = PROT_READ;
     mmap_flags = MAP_SHARED;
 
     if (rd->in_place_update) {
         mmap_prot  |= PROT_WRITE;
     } else if (session->header.needs_swap) {
         mmap_prot  |= PROT_WRITE;
         mmap_flags = MAP_PRIVATE;
     }
 
     if (mmaps[rd->mmap_idx]) {
         munmap(mmaps[rd->mmap_idx], rd->mmap_size);
         mmaps[rd->mmap_idx] = NULL;
     }
 
     page_offset = page_size * (rd->head / page_size);
     rd->file_offset += page_offset;
     rd->head -= page_offset;
 
     buf = mmap(NULL, rd->mmap_size, mmap_prot, mmap_flags, rd->fd,
            rd->file_offset);
     if (buf == MAP_FAILED) {
         pr_err("failed to mmap file\n");
         return -errno;
     }
     mmaps[rd->mmap_idx] = rd->mmap_cur = buf;
     rd->mmap_idx = (rd->mmap_idx + 1) & (ARRAY_SIZE(rd->mmaps) - 1);
     rd->file_pos = rd->file_offset + rd->head;
     if (session->one_mmap) {
         session->one_mmap_addr = buf;
         session->one_mmap_offset = rd->file_offset;
     }
 
     return 0;
 }
 
 enum {
     READER_OK,
     READER_NODATA,
 };
 
 static int
 reader__read_event(struct reader *rd, struct perf_session *session,
            struct ui_progress *prog)
 {
     u64 size;
     int err = READER_OK;
     union perf_event *event;
     s64 skip;
 
     event = fetch_mmaped_event(rd->head, rd->mmap_size, rd->mmap_cur,
                    session->header.needs_swap);
     if (IS_ERR(event))
         return PTR_ERR(event);
 
     if (!event)
         return READER_NODATA;
 
     size = event->header.size;
 
     skip = -EINVAL;
 
     if (size < sizeof(struct perf_event_header) ||
         (skip = rd->process(session, event, rd->file_pos, rd->path)) < 0) {
         pr_err("%#" PRIx64 " [%#x]: failed to process type: %d [%s]\n",
                rd->file_offset + rd->head, event->header.size,
                event->header.type, strerror(-skip));
         err = skip;
         goto out;
     }
 
     if (skip)
         size += skip;
 
     rd->size += size;
     rd->head += size;
     rd->file_pos += size;
 
     err = __perf_session__process_decomp_events(session);
     if (err)
         goto out;
 
     ui_progress__update(prog, size);
 
 out:
     return err;
 }
 
 static inline bool
 reader__eof(struct reader *rd)
 {
     return (rd->file_pos >= rd->data_size + rd->data_offset);
 }
 
 static int
 reader__process_events(struct reader *rd, struct perf_session *session,
                struct ui_progress *prog)
 {
     int err;
 
     err = reader__init(rd, &session->one_mmap);
     if (err)
         goto out;
 
     session->active_decomp = &rd->decomp_data;
 
 remap:
     err = reader__mmap(rd, session);
     if (err)
         goto out;
 
 more:
     err = reader__read_event(rd, session, prog);
     if (err < 0)
         goto out;
     else if (err == READER_NODATA)
         goto remap;
 
     if (session_done())
         goto out;
 
     if (!reader__eof(rd))
         goto more;
 
 out:
     session->active_decomp = &session->decomp_data;
     return err;
 }
 
 static s64 process_simple(struct perf_session *session,
               union perf_event *event,
               u64 file_offset,
               const char *file_path)
 {
     return perf_session__process_event(session, event, file_offset, file_path);
 }
 
 static int __perf_session__process_events(struct perf_session *session)
 {
     struct reader rd = {
         .fd     = perf_data__fd(session->data),
         .path       = session->data->file.path,
         .data_size  = session->header.data_size,
         .data_offset    = session->header.data_offset,
         .process    = process_simple,
         .in_place_update = session->data->in_place_update,
     };
     struct ordered_events *oe = &session->ordered_events;
     struct perf_tool *tool = session->tool;
     struct ui_progress prog;
     int err;
 
     perf_tool__fill_defaults(tool);
 
     if (rd.data_size == 0)
         return -1;
 
     ui_progress__init_size(&prog, rd.data_size, "Processing events...");
 
     err = reader__process_events(&rd, session, &prog);
     if (err)
         goto out_err;
     /* do the final flush for ordered samples */
     err = ordered_events__flush(oe, OE_FLUSH__FINAL);
     if (err)
         goto out_err;
     err = auxtrace__flush_events(session, tool);
     if (err)
         goto out_err;
     err = perf_session__flush_thread_stacks(session);
 out_err:
     ui_progress__finish();
     if (!tool->no_warn)
         perf_session__warn_about_errors(session);
     /*
      * We may switching perf.data output, make ordered_events
      * reusable.
      */
     ordered_events__reinit(&session->ordered_events);
     auxtrace__free_events(session);
     reader__release_decomp(&rd);
     session->one_mmap = false;
     return err;
 }
 
 /*
  * Processing 2 MB of data from each reader in sequence,
  * because that's the way the ordered events sorting works
  * most efficiently.
  */
 #define READER_MAX_SIZE (2 * 1024 * 1024)
 
 /*
  * This function reads, merge and process directory data.
  * It assumens the version 1 of directory data, where each
  * data file holds per-cpu data, already sorted by kernel.
  */
 static int __perf_session__process_dir_events(struct perf_session *session)
 {
     struct perf_data *data = session->data;
     struct perf_tool *tool = session->tool;
     int i, ret, readers, nr_readers;
     struct ui_progress prog;
     u64 total_size = perf_data__size(session->data);
     struct reader *rd;
 
     perf_tool__fill_defaults(tool);
 
     ui_progress__init_size(&prog, total_size, "Sorting events...");
 
     nr_readers = 1;
     for (i = 0; i < data->dir.nr; i++) {
         if (data->dir.files[i].size)
             nr_readers++;
     }
 
     rd = zalloc(nr_readers * sizeof(struct reader));
     if (!rd)
         return -ENOMEM;
 
     rd[0] = (struct reader) {
         .fd      = perf_data__fd(session->data),
         .path        = session->data->file.path,
         .data_size   = session->header.data_size,
         .data_offset     = session->header.data_offset,
         .process     = process_simple,
         .in_place_update = session->data->in_place_update,
     };
     ret = reader__init(&rd[0], NULL);
     if (ret)
         goto out_err;
     ret = reader__mmap(&rd[0], session);
     if (ret)
         goto out_err;
     readers = 1;
 
     for (i = 0; i < data->dir.nr; i++) {
         if (!data->dir.files[i].size)
             continue;
         rd[readers] = (struct reader) {
             .fd      = data->dir.files[i].fd,
             .path        = data->dir.files[i].path,
             .data_size   = data->dir.files[i].size,
             .data_offset     = 0,
             .process     = process_simple,
             .in_place_update = session->data->in_place_update,
         };
         ret = reader__init(&rd[readers], NULL);
         if (ret)
             goto out_err;
         ret = reader__mmap(&rd[readers], session);
         if (ret)
             goto out_err;
         readers++;
     }
 
     i = 0;
     while (readers) {
         if (session_done())
             break;
 
         if (rd[i].done) {
             i = (i + 1) % nr_readers;
             continue;
         }
         if (reader__eof(&rd[i])) {
             rd[i].done = true;
             readers--;
             continue;
         }
 
         session->active_decomp = &rd[i].decomp_data;
         ret = reader__read_event(&rd[i], session, &prog);
         if (ret < 0) {
             goto out_err;
         } else if (ret == READER_NODATA) {
             ret = reader__mmap(&rd[i], session);
             if (ret)
                 goto out_err;
         }
 
         if (rd[i].size >= READER_MAX_SIZE) {
             rd[i].size = 0;
             i = (i + 1) % nr_readers;
         }
     }
 
     ret = ordered_events__flush(&session->ordered_events, OE_FLUSH__FINAL);
     if (ret)
         goto out_err;
 
     ret = perf_session__flush_thread_stacks(session);
 out_err:
     ui_progress__finish();
 
     if (!tool->no_warn)
         perf_session__warn_about_errors(session);
 
     /*
      * We may switching perf.data output, make ordered_events
      * reusable.
      */
     ordered_events__reinit(&session->ordered_events);
 
     session->one_mmap = false;
 
     session->active_decomp = &session->decomp_data;
     for (i = 0; i < nr_readers; i++)
         reader__release_decomp(&rd[i]);
     zfree(&rd);
 
     return ret;
 }
 
 int perf_session__process_events(struct perf_session *session)
 {
     if (perf_session__register_idle_thread(session) < 0)
         return -ENOMEM;
 
     if (perf_data__is_pipe(session->data))
         return __perf_session__process_pipe_events(session);
 
     if (perf_data__is_dir(session->data) && session->data->dir.nr)
         return __perf_session__process_dir_events(session);
 
     return __perf_session__process_events(session);
 }
 
 bool perf_session__has_traces(struct perf_session *session, const char *msg)
 {
     struct evsel *evsel;
 
     evlist__for_each_entry(session->evlist, evsel) {
         if (evsel->core.attr.type == PERF_TYPE_TRACEPOINT)
             return true;
     }
 
     pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
     return false;
 }
 
 int map__set_kallsyms_ref_reloc_sym(struct map *map, const char *symbol_name, u64 addr)
 {
     char *bracket;
     struct ref_reloc_sym *ref;
     struct kmap *kmap;
 
     ref = zalloc(sizeof(struct ref_reloc_sym));
     if (ref == NULL)
         return -ENOMEM;
 
     ref->name = strdup(symbol_name);
     if (ref->name == NULL) {
         free(ref);
         return -ENOMEM;
     }
 
     bracket = strchr(ref->name, ']');
     if (bracket)
         *bracket = '\0';
 
     ref->addr = addr;
 
     kmap = map__kmap(map);
     if (kmap)
         kmap->ref_reloc_sym = ref;
 
     return 0;
 }
 
 size_t perf_session__fprintf_dsos(struct perf_session *session, FILE *fp)
 {
     return machines__fprintf_dsos(&session->machines, fp);
 }
 
 size_t perf_session__fprintf_dsos_buildid(struct perf_session *session, FILE *fp,
                       bool (skip)(struct dso *dso, int parm), int parm)
 {
     return machines__fprintf_dsos_buildid(&session->machines, fp, skip, parm);
 }
 
 size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp,
                        bool skip_empty)
 {
     size_t ret;
     const char *msg = "";
 
     if (perf_header__has_feat(&session->header, HEADER_AUXTRACE))
         msg = " (excludes AUX area (e.g. instruction trace) decoded / synthesized events)";
 
     ret = fprintf(fp, "\nAggregated stats:%s\n", msg);
 
     ret += events_stats__fprintf(&session->evlist->stats, fp, skip_empty);
     return ret;
 }
 
 size_t perf_session__fprintf(struct perf_session *session, FILE *fp)
 {
     /*
      * FIXME: Here we have to actually print all the machines in this
      * session, not just the host...
      */
     return machine__fprintf(&session->machines.host, fp);
 }
 
 struct evsel *perf_session__find_first_evtype(struct perf_session *session,
                           unsigned int type)
 {
     struct evsel *pos;
 
     evlist__for_each_entry(session->evlist, pos) {
         if (pos->core.attr.type == type)
             return pos;
     }
     return NULL;
 }
 
 int perf_session__cpu_bitmap(struct perf_session *session,
                  const char *cpu_list, unsigned long *cpu_bitmap)
 {
     int i, err = -1;
     struct perf_cpu_map *map;
     int nr_cpus = min(session->header.env.nr_cpus_avail, MAX_NR_CPUS);
 
     for (i = 0; i < PERF_TYPE_MAX; ++i) {
         struct evsel *evsel;
 
         evsel = perf_session__find_first_evtype(session, i);
         if (!evsel)
             continue;
 
         if (!(evsel->core.attr.sample_type & PERF_SAMPLE_CPU)) {
             pr_err("File does not contain CPU events. "
                    "Remove -C option to proceed.\n");
             return -1;
         }
     }
 
     map = perf_cpu_map__new(cpu_list);
     if (map == NULL) {
         pr_err("Invalid cpu_list\n");
         return -1;
     }
 
     for (i = 0; i < perf_cpu_map__nr(map); i++) {
         struct perf_cpu cpu = perf_cpu_map__cpu(map, i);
 
         if (cpu.cpu >= nr_cpus) {
             pr_err("Requested CPU %d too large. "
                    "Consider raising MAX_NR_CPUS\n", cpu.cpu);
             goto out_delete_map;
         }
 
         set_bit(cpu.cpu, cpu_bitmap);
     }
 
     err = 0;
 
 out_delete_map:
     perf_cpu_map__put(map);
     return err;
 }
 
 void perf_session__fprintf_info(struct perf_session *session, FILE *fp,
                 bool full)
 {
     if (session == NULL || fp == NULL)
         return;
 
     fprintf(fp, "# ========\n");
     perf_header__fprintf_info(session, fp, full);
     fprintf(fp, "# ========\n#\n");
 }
 
 static int perf_session__register_guest(struct perf_session *session, pid_t machine_pid)
 {
     struct machine *machine = machines__findnew(&session->machines, machine_pid);
     struct thread *thread;
 
     if (!machine)
         return -ENOMEM;
 
     machine->single_address_space = session->machines.host.single_address_space;
 
     thread = machine__idle_thread(machine);
     if (!thread)
         return -ENOMEM;
     thread__put(thread);
 
     machine->kallsyms_filename = perf_data__guest_kallsyms_name(session->data, machine_pid);
 
     return 0;
 }
 
 static int perf_session__set_guest_cpu(struct perf_session *session, pid_t pid,
                        pid_t tid, int guest_cpu)
 {
     struct machine *machine = &session->machines.host;
     struct thread *thread = machine__findnew_thread(machine, pid, tid);
 
     if (!thread)
         return -ENOMEM;
     thread->guest_cpu = guest_cpu;
     thread__put(thread);
 
     return 0;
 }
 
 int perf_event__process_id_index(struct perf_session *session,
                  union perf_event *event)
 {
     struct evlist *evlist = session->evlist;
     struct perf_record_id_index *ie = &event->id_index;
     size_t sz = ie->header.size - sizeof(*ie);
     size_t i, nr, max_nr;
     size_t e1_sz = sizeof(struct id_index_entry);
     size_t e2_sz = sizeof(struct id_index_entry_2);
     size_t etot_sz = e1_sz + e2_sz;
     struct id_index_entry_2 *e2;
     pid_t last_pid = 0;
 
     max_nr = sz / e1_sz;
     nr = ie->nr;
     if (nr > max_nr) {
         printf("Too big: nr %zu max_nr %zu\n", nr, max_nr);
         return -EINVAL;
     }
 
     if (sz >= nr * etot_sz) {
         max_nr = sz / etot_sz;
         if (nr > max_nr) {
             printf("Too big2: nr %zu max_nr %zu\n", nr, max_nr);
             return -EINVAL;
         }
         e2 = (void *)ie + sizeof(*ie) + nr * e1_sz;
     } else {
         e2 = NULL;
     }
 
     if (dump_trace)
         fprintf(stdout, " nr: %zu\n", nr);
 
     for (i = 0; i < nr; i++, (e2 ? e2++ : 0)) {
         struct id_index_entry *e = &ie->entries[i];
         struct perf_sample_id *sid;
         int ret;
 
         if (dump_trace) {
             fprintf(stdout, " ... id: %"PRI_lu64, e->id);
             fprintf(stdout, "  idx: %"PRI_lu64, e->idx);
             fprintf(stdout, "  cpu: %"PRI_ld64, e->cpu);
             fprintf(stdout, "  tid: %"PRI_ld64, e->tid);
             if (e2) {
                 fprintf(stdout, "  machine_pid: %"PRI_ld64, e2->machine_pid);
                 fprintf(stdout, "  vcpu: %"PRI_lu64"\n", e2->vcpu);
             } else {
                 fprintf(stdout, "\n");
             }
         }
 
         sid = evlist__id2sid(evlist, e->id);
         if (!sid)
             return -ENOENT;
 
         sid->idx = e->idx;
         sid->cpu.cpu = e->cpu;
         sid->tid = e->tid;
 
         if (!e2)
             continue;
 
         sid->machine_pid = e2->machine_pid;
         sid->vcpu.cpu = e2->vcpu;
 
         if (!sid->machine_pid)
             continue;
 
         if (sid->machine_pid != last_pid) {
             ret = perf_session__register_guest(session, sid->machine_pid);
             if (ret)
                 return ret;
             last_pid = sid->machine_pid;
             perf_guest = true;
         }
 
         ret = perf_session__set_guest_cpu(session, sid->machine_pid, e->tid, e2->vcpu);
         if (ret)
             return ret;
     }
     return 0;
 }