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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-only
 /*
  * Copyright (c) 2017, Intel Corporation.
  */
 
 /* Manage metrics and groups of metrics from JSON files */
 
 #include "metricgroup.h"
 #include "debug.h"
 #include "evlist.h"
 #include "evsel.h"
 #include "strbuf.h"
 #include "pmu.h"
 #include "pmu-hybrid.h"
 #include "expr.h"
 #include "rblist.h"
 #include <string.h>
 #include <errno.h>
 #include "strlist.h"
 #include <assert.h>
 #include <linux/ctype.h>
 #include <linux/list_sort.h>
 #include <linux/string.h>
 #include <linux/zalloc.h>
 #include <subcmd/parse-options.h>
 #include <api/fs/fs.h>
 #include "util.h"
 #include <asm/bug.h>
 #include "cgroup.h"
 
 struct metric_event *metricgroup__lookup(struct rblist *metric_events,
                      struct evsel *evsel,
                      bool create)
 {
     struct rb_node *nd;
     struct metric_event me = {
         .evsel = evsel
     };
 
     if (!metric_events)
         return NULL;
 
     nd = rblist__find(metric_events, &me);
     if (nd)
         return container_of(nd, struct metric_event, nd);
     if (create) {
         rblist__add_node(metric_events, &me);
         nd = rblist__find(metric_events, &me);
         if (nd)
             return container_of(nd, struct metric_event, nd);
     }
     return NULL;
 }
 
 static int metric_event_cmp(struct rb_node *rb_node, const void *entry)
 {
     struct metric_event *a = container_of(rb_node,
                           struct metric_event,
                           nd);
     const struct metric_event *b = entry;
 
     if (a->evsel == b->evsel)
         return 0;
     if ((char *)a->evsel < (char *)b->evsel)
         return -1;
     return +1;
 }
 
 static struct rb_node *metric_event_new(struct rblist *rblist __maybe_unused,
                     const void *entry)
 {
     struct metric_event *me = malloc(sizeof(struct metric_event));
 
     if (!me)
         return NULL;
     memcpy(me, entry, sizeof(struct metric_event));
     me->evsel = ((struct metric_event *)entry)->evsel;
     INIT_LIST_HEAD(&me->head);
     return &me->nd;
 }
 
 static void metric_event_delete(struct rblist *rblist __maybe_unused,
                 struct rb_node *rb_node)
 {
     struct metric_event *me = container_of(rb_node, struct metric_event, nd);
     struct metric_expr *expr, *tmp;
 
     list_for_each_entry_safe(expr, tmp, &me->head, nd) {
         free((char *)expr->metric_name);
         free(expr->metric_refs);
         free(expr->metric_events);
         free(expr);
     }
 
     free(me);
 }
 
 static void metricgroup__rblist_init(struct rblist *metric_events)
 {
     rblist__init(metric_events);
     metric_events->node_cmp = metric_event_cmp;
     metric_events->node_new = metric_event_new;
     metric_events->node_delete = metric_event_delete;
 }
 
 void metricgroup__rblist_exit(struct rblist *metric_events)
 {
     rblist__exit(metric_events);
 }
 
 /*
  * A node in the list of referenced metrics. metric_expr
  * is held as a convenience to avoid a search through the
  * metric list.
  */
 struct metric_ref_node {
     const char *metric_name;
     const char *metric_expr;
     struct list_head list;
 };
 
 /**
  * The metric under construction. The data held here will be placed in a
  * metric_expr.
  */
 struct metric {
     struct list_head nd;
     /**
      * The expression parse context importantly holding the IDs contained
      * within the expression.
      */
     struct expr_parse_ctx *pctx;
     /** The name of the metric such as "IPC". */
     const char *metric_name;
     /** Modifier on the metric such as "u" or NULL for none. */
     const char *modifier;
     /** The expression to parse, for example, "instructions/cycles". */
     const char *metric_expr;
     /**
      * The "ScaleUnit" that scales and adds a unit to the metric during
      * output.
      */
     const char *metric_unit;
     /** Optional null terminated array of referenced metrics. */
     struct metric_ref *metric_refs;
     /**
      * Is there a constraint on the group of events? In which case the
      * events won't be grouped.
      */
     bool has_constraint;
     /**
      * Parsed events for the metric. Optional as events may be taken from a
      * different metric whose group contains all the IDs necessary for this
      * one.
      */
     struct evlist *evlist;
 };
 
 static void metricgroup___watchdog_constraint_hint(const char *name, bool foot)
 {
     static bool violate_nmi_constraint;
 
     if (!foot) {
         pr_warning("Splitting metric group %s into standalone metrics.\n", name);
         violate_nmi_constraint = true;
         return;
     }
 
     if (!violate_nmi_constraint)
         return;
 
     pr_warning("Try disabling the NMI watchdog to comply NO_NMI_WATCHDOG metric constraint:\n"
            "    echo 0 > /proc/sys/kernel/nmi_watchdog\n"
            "    perf stat ...\n"
            "    echo 1 > /proc/sys/kernel/nmi_watchdog\n");
 }
 
 static bool metricgroup__has_constraint(const struct pmu_event *pe)
 {
     if (!pe->metric_constraint)
         return false;
 
     if (!strcmp(pe->metric_constraint, "NO_NMI_WATCHDOG") &&
         sysctl__nmi_watchdog_enabled()) {
         metricgroup___watchdog_constraint_hint(pe->metric_name, false);
         return true;
     }
 
     return false;
 }
 
 static struct metric *metric__new(const struct pmu_event *pe,
                   const char *modifier,
                   bool metric_no_group,
                   int runtime)
 {
     struct metric *m;
 
     m = zalloc(sizeof(*m));
     if (!m)
         return NULL;
 
     m->pctx = expr__ctx_new();
     if (!m->pctx) {
         free(m);
         return NULL;
     }
 
     m->metric_name = pe->metric_name;
     m->modifier = modifier ? strdup(modifier) : NULL;
     if (modifier && !m->modifier) {
         expr__ctx_free(m->pctx);
         free(m);
         return NULL;
     }
     m->metric_expr = pe->metric_expr;
     m->metric_unit = pe->unit;
     m->pctx->runtime = runtime;
     m->has_constraint = metric_no_group || metricgroup__has_constraint(pe);
     m->metric_refs = NULL;
     m->evlist = NULL;
 
     return m;
 }
 
 static void metric__free(struct metric *m)
 {
     free(m->metric_refs);
     expr__ctx_free(m->pctx);
     free((char *)m->modifier);
     evlist__delete(m->evlist);
     free(m);
 }
 
 static bool contains_metric_id(struct evsel **metric_events, int num_events,
                    const char *metric_id)
 {
     int i;
 
     for (i = 0; i < num_events; i++) {
         if (!strcmp(evsel__metric_id(metric_events[i]), metric_id))
             return true;
     }
     return false;
 }
 
 /**
  * setup_metric_events - Find a group of events in metric_evlist that correspond
  *                       to the IDs from a parsed metric expression.
  * @ids: the metric IDs to match.
  * @metric_evlist: the list of perf events.
  * @out_metric_events: holds the created metric events array.
  */
 static int setup_metric_events(struct hashmap *ids,
                    struct evlist *metric_evlist,
                    struct evsel ***out_metric_events)
 {
     struct evsel **metric_events;
     const char *metric_id;
     struct evsel *ev;
     size_t ids_size, matched_events, i;
 
     *out_metric_events = NULL;
     ids_size = hashmap__size(ids);
 
     metric_events = calloc(sizeof(void *), ids_size + 1);
     if (!metric_events)
         return -ENOMEM;
 
     matched_events = 0;
     evlist__for_each_entry(metric_evlist, ev) {
         struct expr_id_data *val_ptr;
 
         /*
          * Check for duplicate events with the same name. For
          * example, uncore_imc/cas_count_read/ will turn into 6
          * events per socket on skylakex. Only the first such
          * event is placed in metric_events.
          */
         metric_id = evsel__metric_id(ev);
         if (contains_metric_id(metric_events, matched_events, metric_id))
             continue;
         /*
          * Does this event belong to the parse context? For
          * combined or shared groups, this metric may not care
          * about this event.
          */
         if (hashmap__find(ids, metric_id, (void **)&val_ptr)) {
             metric_events[matched_events++] = ev;
 
             if (matched_events >= ids_size)
                 break;
         }
     }
     if (matched_events < ids_size) {
         free(metric_events);
         return -EINVAL;
     }
     for (i = 0; i < ids_size; i++) {
         ev = metric_events[i];
         ev->collect_stat = true;
 
         /*
          * The metric leader points to the identically named
          * event in metric_events.
          */
         ev->metric_leader = ev;
         /*
          * Mark two events with identical names in the same
          * group (or globally) as being in use as uncore events
          * may be duplicated for each pmu. Set the metric leader
          * of such events to be the event that appears in
          * metric_events.
          */
         metric_id = evsel__metric_id(ev);
         evlist__for_each_entry_continue(metric_evlist, ev) {
             if (!strcmp(evsel__metric_id(ev), metric_id))
                 ev->metric_leader = metric_events[i];
         }
     }
     *out_metric_events = metric_events;
     return 0;
 }
 
 static bool match_metric(const char *n, const char *list)
 {
     int len;
     char *m;
 
     if (!list)
         return false;
     if (!strcmp(list, "all"))
         return true;
     if (!n)
         return !strcasecmp(list, "No_group");
     len = strlen(list);
     m = strcasestr(n, list);
     if (!m)
         return false;
     if ((m == n || m[-1] == ';' || m[-1] == ' ') &&
         (m[len] == 0 || m[len] == ';'))
         return true;
     return false;
 }
 
 static bool match_pe_metric(const struct pmu_event *pe, const char *metric)
 {
     return match_metric(pe->metric_group, metric) ||
            match_metric(pe->metric_name, metric);
 }
 
 struct mep {
     struct rb_node nd;
     const char *name;
     struct strlist *metrics;
 };
 
 static int mep_cmp(struct rb_node *rb_node, const void *entry)
 {
     struct mep *a = container_of(rb_node, struct mep, nd);
     struct mep *b = (struct mep *)entry;
 
     return strcmp(a->name, b->name);
 }
 
 static struct rb_node *mep_new(struct rblist *rl __maybe_unused,
                     const void *entry)
 {
     struct mep *me = malloc(sizeof(struct mep));
 
     if (!me)
         return NULL;
     memcpy(me, entry, sizeof(struct mep));
     me->name = strdup(me->name);
     if (!me->name)
         goto out_me;
     me->metrics = strlist__new(NULL, NULL);
     if (!me->metrics)
         goto out_name;
     return &me->nd;
 out_name:
     zfree(&me->name);
 out_me:
     free(me);
     return NULL;
 }
 
 static struct mep *mep_lookup(struct rblist *groups, const char *name)
 {
     struct rb_node *nd;
     struct mep me = {
         .name = name
     };
     nd = rblist__find(groups, &me);
     if (nd)
         return container_of(nd, struct mep, nd);
     rblist__add_node(groups, &me);
     nd = rblist__find(groups, &me);
     if (nd)
         return container_of(nd, struct mep, nd);
     return NULL;
 }
 
 static void mep_delete(struct rblist *rl __maybe_unused,
                struct rb_node *nd)
 {
     struct mep *me = container_of(nd, struct mep, nd);
 
     strlist__delete(me->metrics);
     zfree(&me->name);
     free(me);
 }
 
 static void metricgroup__print_strlist(struct strlist *metrics, bool raw)
 {
     struct str_node *sn;
     int n = 0;
 
     strlist__for_each_entry (sn, metrics) {
         if (raw)
             printf("%s%s", n > 0 ? " " : "", sn->s);
         else
             printf("  %s\n", sn->s);
         n++;
     }
     if (raw)
         putchar('\n');
 }
 
 static int metricgroup__print_pmu_event(const struct pmu_event *pe,
                     bool metricgroups, char *filter,
                     bool raw, bool details,
                     struct rblist *groups,
                     struct strlist *metriclist)
 {
     const char *g;
     char *omg, *mg;
 
     g = pe->metric_group;
     if (!g && pe->metric_name) {
         if (pe->name)
             return 0;
         g = "No_group";
     }
 
     if (!g)
         return 0;
 
     mg = strdup(g);
 
     if (!mg)
         return -ENOMEM;
     omg = mg;
     while ((g = strsep(&mg, ";")) != NULL) {
         struct mep *me;
         char *s;
 
         g = skip_spaces(g);
         if (*g == 0)
             g = "No_group";
         if (filter && !strstr(g, filter))
             continue;
         if (raw)
             s = (char *)pe->metric_name;
         else {
             if (asprintf(&s, "%s\n%*s%s]",
                      pe->metric_name, 8, "[", pe->desc) < 0)
                 return -1;
             if (details) {
                 if (asprintf(&s, "%s\n%*s%s]",
                          s, 8, "[", pe->metric_expr) < 0)
                     return -1;
             }
         }
 
         if (!s)
             continue;
 
         if (!metricgroups) {
             strlist__add(metriclist, s);
         } else {
             me = mep_lookup(groups, g);
             if (!me)
                 continue;
             strlist__add(me->metrics, s);
         }
 
         if (!raw)
             free(s);
     }
     free(omg);
 
     return 0;
 }
 
 struct metricgroup_print_sys_idata {
     struct strlist *metriclist;
     char *filter;
     struct rblist *groups;
     bool metricgroups;
     bool raw;
     bool details;
 };
 
 struct metricgroup_iter_data {
     pmu_event_iter_fn fn;
     void *data;
 };
 
 static int metricgroup__sys_event_iter(const struct pmu_event *pe,
                        const struct pmu_events_table *table,
                        void *data)
 {
     struct metricgroup_iter_data *d = data;
     struct perf_pmu *pmu = NULL;
 
     if (!pe->metric_expr || !pe->compat)
         return 0;
 
     while ((pmu = perf_pmu__scan(pmu))) {
 
         if (!pmu->id || strcmp(pmu->id, pe->compat))
             continue;
 
         return d->fn(pe, table, d->data);
     }
 
     return 0;
 }
 
 static int metricgroup__print_sys_event_iter(const struct pmu_event *pe,
                          const struct pmu_events_table *table __maybe_unused,
                          void *data)
 {
     struct metricgroup_print_sys_idata *d = data;
 
     return metricgroup__print_pmu_event(pe, d->metricgroups, d->filter, d->raw,
                      d->details, d->groups, d->metriclist);
 }
 
 struct metricgroup_print_data {
     const char *pmu_name;
     struct strlist *metriclist;
     char *filter;
     struct rblist *groups;
     bool metricgroups;
     bool raw;
     bool details;
 };
 
 static int metricgroup__print_callback(const struct pmu_event *pe,
                        const struct pmu_events_table *table __maybe_unused,
                        void *vdata)
 {
     struct metricgroup_print_data *data = vdata;
 
     if (!pe->metric_expr)
         return 0;
 
     if (data->pmu_name && perf_pmu__is_hybrid(pe->pmu) && strcmp(data->pmu_name, pe->pmu))
         return 0;
 
     return metricgroup__print_pmu_event(pe, data->metricgroups, data->filter,
                         data->raw, data->details, data->groups,
                         data->metriclist);
 }
 
 void metricgroup__print(bool metrics, bool metricgroups, char *filter,
             bool raw, bool details, const char *pmu_name)
 {
     struct rblist groups;
     struct rb_node *node, *next;
     struct strlist *metriclist = NULL;
     const struct pmu_events_table *table;
 
     if (!metricgroups) {
         metriclist = strlist__new(NULL, NULL);
         if (!metriclist)
             return;
     }
 
     rblist__init(&groups);
     groups.node_new = mep_new;
     groups.node_cmp = mep_cmp;
     groups.node_delete = mep_delete;
     table = pmu_events_table__find();
     if (table) {
         struct metricgroup_print_data data = {
             .pmu_name = pmu_name,
             .metriclist = metriclist,
             .metricgroups = metricgroups,
             .filter = filter,
             .raw = raw,
             .details = details,
             .groups = &groups,
         };
 
         pmu_events_table_for_each_event(table,
                         metricgroup__print_callback,
                         &data);
     }
     {
         struct metricgroup_iter_data data = {
             .fn = metricgroup__print_sys_event_iter,
             .data = (void *) &(struct metricgroup_print_sys_idata){
                 .metriclist = metriclist,
                 .metricgroups = metricgroups,
                 .filter = filter,
                 .raw = raw,
                 .details = details,
                 .groups = &groups,
             },
         };
 
         pmu_for_each_sys_event(metricgroup__sys_event_iter, &data);
     }
 
     if (!filter || !rblist__empty(&groups)) {
         if (metricgroups && !raw)
             printf("\nMetric Groups:\n\n");
         else if (metrics && !raw)
             printf("\nMetrics:\n\n");
     }
 
     for (node = rb_first_cached(&groups.entries); node; node = next) {
         struct mep *me = container_of(node, struct mep, nd);
 
         if (metricgroups)
             printf("%s%s%s", me->name, metrics && !raw ? ":" : "", raw ? " " : "\n");
         if (metrics)
             metricgroup__print_strlist(me->metrics, raw);
         next = rb_next(node);
         rblist__remove_node(&groups, node);
     }
     if (!metricgroups)
         metricgroup__print_strlist(metriclist, raw);
     strlist__delete(metriclist);
 }
 
 static const char *code_characters = ",-=@";
 
 static int encode_metric_id(struct strbuf *sb, const char *x)
 {
     char *c;
     int ret = 0;
 
     for (; *x; x++) {
         c = strchr(code_characters, *x);
         if (c) {
             ret = strbuf_addch(sb, '!');
             if (ret)
                 break;
 
             ret = strbuf_addch(sb, '0' + (c - code_characters));
             if (ret)
                 break;
         } else {
             ret = strbuf_addch(sb, *x);
             if (ret)
                 break;
         }
     }
     return ret;
 }
 
 static int decode_metric_id(struct strbuf *sb, const char *x)
 {
     const char *orig = x;
     size_t i;
     char c;
     int ret;
 
     for (; *x; x++) {
         c = *x;
         if (*x == '!') {
             x++;
             i = *x - '0';
             if (i > strlen(code_characters)) {
                 pr_err("Bad metric-id encoding in: '%s'", orig);
                 return -1;
             }
             c = code_characters[i];
         }
         ret = strbuf_addch(sb, c);
         if (ret)
             return ret;
     }
     return 0;
 }
 
 static int decode_all_metric_ids(struct evlist *perf_evlist, const char *modifier)
 {
     struct evsel *ev;
     struct strbuf sb = STRBUF_INIT;
     char *cur;
     int ret = 0;
 
     evlist__for_each_entry(perf_evlist, ev) {
         if (!ev->metric_id)
             continue;
 
         ret = strbuf_setlen(&sb, 0);
         if (ret)
             break;
 
         ret = decode_metric_id(&sb, ev->metric_id);
         if (ret)
             break;
 
         free((char *)ev->metric_id);
         ev->metric_id = strdup(sb.buf);
         if (!ev->metric_id) {
             ret = -ENOMEM;
             break;
         }
         /*
          * If the name is just the parsed event, use the metric-id to
          * give a more friendly display version.
          */
         if (strstr(ev->name, "metric-id=")) {
             bool has_slash = false;
 
             free(ev->name);
             for (cur = strchr(sb.buf, '@') ; cur; cur = strchr(++cur, '@')) {
                 *cur = '/';
                 has_slash = true;
             }
 
             if (modifier) {
                 if (!has_slash && !strchr(sb.buf, ':')) {
                     ret = strbuf_addch(&sb, ':');
                     if (ret)
                         break;
                 }
                 ret = strbuf_addstr(&sb, modifier);
                 if (ret)
                     break;
             }
             ev->name = strdup(sb.buf);
             if (!ev->name) {
                 ret = -ENOMEM;
                 break;
             }
         }
     }
     strbuf_release(&sb);
     return ret;
 }
 
 static int metricgroup__build_event_string(struct strbuf *events,
                        const struct expr_parse_ctx *ctx,
                        const char *modifier,
                        bool has_constraint)
 {
     struct hashmap_entry *cur;
     size_t bkt;
     bool no_group = true, has_tool_events = false;
     bool tool_events[PERF_TOOL_MAX] = {false};
     int ret = 0;
 
 #define RETURN_IF_NON_ZERO(x) do { if (x) return x; } while (0)
 
     hashmap__for_each_entry(ctx->ids, cur, bkt) {
         const char *sep, *rsep, *id = cur->key;
         enum perf_tool_event ev;
 
         pr_debug("found event %s\n", id);
 
         /* Always move tool events outside of the group. */
         ev = perf_tool_event__from_str(id);
         if (ev != PERF_TOOL_NONE) {
             has_tool_events = true;
             tool_events[ev] = true;
             continue;
         }
         /* Separate events with commas and open the group if necessary. */
         if (no_group) {
             if (!has_constraint) {
                 ret = strbuf_addch(events, '{');
                 RETURN_IF_NON_ZERO(ret);
             }
 
             no_group = false;
         } else {
             ret = strbuf_addch(events, ',');
             RETURN_IF_NON_ZERO(ret);
         }
         /*
          * Encode the ID as an event string. Add a qualifier for
          * metric_id that is the original name except with characters
          * that parse-events can't parse replaced. For example,
          * 'msr@tsc@' gets added as msr/tsc,metric-id=msr!3tsc!3/
          */
         sep = strchr(id, '@');
         if (sep != NULL) {
             ret = strbuf_add(events, id, sep - id);
             RETURN_IF_NON_ZERO(ret);
             ret = strbuf_addch(events, '/');
             RETURN_IF_NON_ZERO(ret);
             rsep = strrchr(sep, '@');
             ret = strbuf_add(events, sep + 1, rsep - sep - 1);
             RETURN_IF_NON_ZERO(ret);
             ret = strbuf_addstr(events, ",metric-id=");
             RETURN_IF_NON_ZERO(ret);
             sep = rsep;
         } else {
             sep = strchr(id, ':');
             if (sep != NULL) {
                 ret = strbuf_add(events, id, sep - id);
                 RETURN_IF_NON_ZERO(ret);
             } else {
                 ret = strbuf_addstr(events, id);
                 RETURN_IF_NON_ZERO(ret);
             }
             ret = strbuf_addstr(events, "/metric-id=");
             RETURN_IF_NON_ZERO(ret);
         }
         ret = encode_metric_id(events, id);
         RETURN_IF_NON_ZERO(ret);
         ret = strbuf_addstr(events, "/");
         RETURN_IF_NON_ZERO(ret);
 
         if (sep != NULL) {
             ret = strbuf_addstr(events, sep + 1);
             RETURN_IF_NON_ZERO(ret);
         }
         if (modifier) {
             ret = strbuf_addstr(events, modifier);
             RETURN_IF_NON_ZERO(ret);
         }
     }
     if (!no_group && !has_constraint) {
         ret = strbuf_addf(events, "}:W");
         RETURN_IF_NON_ZERO(ret);
     }
     if (has_tool_events) {
         int i;
 
         perf_tool_event__for_each_event(i) {
             if (tool_events[i]) {
                 if (!no_group) {
                     ret = strbuf_addch(events, ',');
                     RETURN_IF_NON_ZERO(ret);
                 }
                 no_group = false;
                 ret = strbuf_addstr(events, perf_tool_event__to_str(i));
                 RETURN_IF_NON_ZERO(ret);
             }
         }
     }
 
     return ret;
 #undef RETURN_IF_NON_ZERO
 }
 
 int __weak arch_get_runtimeparam(const struct pmu_event *pe __maybe_unused)
 {
     return 1;
 }
 
 /*
  * A singly linked list on the stack of the names of metrics being
  * processed. Used to identify recursion.
  */
 struct visited_metric {
     const char *name;
     const struct visited_metric *parent;
 };
 
 struct metricgroup_add_iter_data {
     struct list_head *metric_list;
     const char *metric_name;
     const char *modifier;
     int *ret;
     bool *has_match;
     bool metric_no_group;
     struct metric *root_metric;
     const struct visited_metric *visited;
     const struct pmu_events_table *table;
 };
 
 static bool metricgroup__find_metric(const char *metric,
                      const struct pmu_events_table *table,
                      struct pmu_event *pe);
 
 static int add_metric(struct list_head *metric_list,
               const struct pmu_event *pe,
               const char *modifier,
               bool metric_no_group,
               struct metric *root_metric,
               const struct visited_metric *visited,
               const struct pmu_events_table *table);
 
 /**
  * resolve_metric - Locate metrics within the root metric and recursively add
  *                    references to them.
  * @metric_list: The list the metric is added to.
  * @modifier: if non-null event modifiers like "u".
  * @metric_no_group: Should events written to events be grouped "{}" or
  *                   global. Grouping is the default but due to multiplexing the
  *                   user may override.
  * @root_metric: Metrics may reference other metrics to form a tree. In this
  *               case the root_metric holds all the IDs and a list of referenced
  *               metrics. When adding a root this argument is NULL.
  * @visited: A singly linked list of metric names being added that is used to
  *           detect recursion.
  * @table: The table that is searched for metrics, most commonly the table for the
  *       architecture perf is running upon.
  */
 static int resolve_metric(struct list_head *metric_list,
               const char *modifier,
               bool metric_no_group,
               struct metric *root_metric,
               const struct visited_metric *visited,
               const struct pmu_events_table *table)
 {
     struct hashmap_entry *cur;
     size_t bkt;
     struct to_resolve {
         /* The metric to resolve. */
         struct pmu_event pe;
         /*
          * The key in the IDs map, this may differ from in case,
          * etc. from pe->metric_name.
          */
         const char *key;
     } *pending = NULL;
     int i, ret = 0, pending_cnt = 0;
 
     /*
      * Iterate all the parsed IDs and if there's a matching metric and it to
      * the pending array.
      */
     hashmap__for_each_entry(root_metric->pctx->ids, cur, bkt) {
         struct pmu_event pe;
 
         if (metricgroup__find_metric(cur->key, table, &pe)) {
             pending = realloc(pending,
                     (pending_cnt + 1) * sizeof(struct to_resolve));
             if (!pending)
                 return -ENOMEM;
 
             memcpy(&pending[pending_cnt].pe, &pe, sizeof(pe));
             pending[pending_cnt].key = cur->key;
             pending_cnt++;
         }
     }
 
     /* Remove the metric IDs from the context. */
     for (i = 0; i < pending_cnt; i++)
         expr__del_id(root_metric->pctx, pending[i].key);
 
     /*
      * Recursively add all the metrics, IDs are added to the root metric's
      * context.
      */
     for (i = 0; i < pending_cnt; i++) {
         ret = add_metric(metric_list, &pending[i].pe, modifier, metric_no_group,
                 root_metric, visited, table);
         if (ret)
             break;
     }
 
     free(pending);
     return ret;
 }
 
 /**
  * __add_metric - Add a metric to metric_list.
  * @metric_list: The list the metric is added to.
  * @pe: The pmu_event containing the metric to be added.
  * @modifier: if non-null event modifiers like "u".
  * @metric_no_group: Should events written to events be grouped "{}" or
  *                   global. Grouping is the default but due to multiplexing the
  *                   user may override.
  * @runtime: A special argument for the parser only known at runtime.
  * @root_metric: Metrics may reference other metrics to form a tree. In this
  *               case the root_metric holds all the IDs and a list of referenced
  *               metrics. When adding a root this argument is NULL.
  * @visited: A singly linked list of metric names being added that is used to
  *           detect recursion.
  * @table: The table that is searched for metrics, most commonly the table for the
  *       architecture perf is running upon.
  */
 static int __add_metric(struct list_head *metric_list,
             const struct pmu_event *pe,
             const char *modifier,
             bool metric_no_group,
             int runtime,
             struct metric *root_metric,
             const struct visited_metric *visited,
             const struct pmu_events_table *table)
 {
     const struct visited_metric *vm;
     int ret;
     bool is_root = !root_metric;
     struct visited_metric visited_node = {
         .name = pe->metric_name,
         .parent = visited,
     };
 
     for (vm = visited; vm; vm = vm->parent) {
         if (!strcmp(pe->metric_name, vm->name)) {
             pr_err("failed: recursion detected for %s\n", pe->metric_name);
             return -1;
         }
     }
 
     if (is_root) {
         /*
          * This metric is the root of a tree and may reference other
          * metrics that are added recursively.
          */
         root_metric = metric__new(pe, modifier, metric_no_group, runtime);
         if (!root_metric)
             return -ENOMEM;
 
     } else {
         int cnt = 0;
 
         /*
          * This metric was referenced in a metric higher in the
          * tree. Check if the same metric is already resolved in the
          * metric_refs list.
          */
         if (root_metric->metric_refs) {
             for (; root_metric->metric_refs[cnt].metric_name; cnt++) {
                 if (!strcmp(pe->metric_name,
                         root_metric->metric_refs[cnt].metric_name))
                     return 0;
             }
         }
 
         /* Create reference. Need space for the entry and the terminator. */
         root_metric->metric_refs = realloc(root_metric->metric_refs,
                         (cnt + 2) * sizeof(struct metric_ref));
         if (!root_metric->metric_refs)
             return -ENOMEM;
 
         /*
          * Intentionally passing just const char pointers,
          * from 'pe' object, so they never go away. We don't
          * need to change them, so there's no need to create
          * our own copy.
          */
         root_metric->metric_refs[cnt].metric_name = pe->metric_name;
         root_metric->metric_refs[cnt].metric_expr = pe->metric_expr;
 
         /* Null terminate array. */
         root_metric->metric_refs[cnt+1].metric_name = NULL;
         root_metric->metric_refs[cnt+1].metric_expr = NULL;
     }
 
     /*
      * For both the parent and referenced metrics, we parse
      * all the metric's IDs and add it to the root context.
      */
     if (expr__find_ids(pe->metric_expr, NULL, root_metric->pctx) < 0) {
         /* Broken metric. */
         ret = -EINVAL;
     } else {
         /* Resolve referenced metrics. */
         ret = resolve_metric(metric_list, modifier, metric_no_group, root_metric,
                      &visited_node, table);
     }
 
     if (ret) {
         if (is_root)
             metric__free(root_metric);
 
     } else if (is_root)
         list_add(&root_metric->nd, metric_list);
 
     return ret;
 }
 
 struct metricgroup__find_metric_data {
     const char *metric;
     struct pmu_event *pe;
 };
 
 static int metricgroup__find_metric_callback(const struct pmu_event *pe,
                          const struct pmu_events_table *table  __maybe_unused,
                          void *vdata)
 {
     struct metricgroup__find_metric_data *data = vdata;
 
     if (!match_metric(pe->metric_name, data->metric))
         return 0;
 
     memcpy(data->pe, pe, sizeof(*pe));
     return 1;
 }
 
 static bool metricgroup__find_metric(const char *metric,
                      const struct pmu_events_table *table,
                      struct pmu_event *pe)
 {
     struct metricgroup__find_metric_data data = {
         .metric = metric,
         .pe = pe,
     };
 
     return pmu_events_table_for_each_event(table, metricgroup__find_metric_callback, &data)
         ? true : false;
 }
 
 static int add_metric(struct list_head *metric_list,
               const struct pmu_event *pe,
               const char *modifier,
               bool metric_no_group,
               struct metric *root_metric,
               const struct visited_metric *visited,
               const struct pmu_events_table *table)
 {
     int ret = 0;
 
     pr_debug("metric expr %s for %s\n", pe->metric_expr, pe->metric_name);
 
     if (!strstr(pe->metric_expr, "?")) {
         ret = __add_metric(metric_list, pe, modifier, metric_no_group, 0,
                    root_metric, visited, table);
     } else {
         int j, count;
 
         count = arch_get_runtimeparam(pe);
 
         /* This loop is added to create multiple
          * events depend on count value and add
          * those events to metric_list.
          */
 
         for (j = 0; j < count && !ret; j++)
             ret = __add_metric(metric_list, pe, modifier, metric_no_group, j,
                     root_metric, visited, table);
     }
 
     return ret;
 }
 
 static int metricgroup__add_metric_sys_event_iter(const struct pmu_event *pe,
                         const struct pmu_events_table *table __maybe_unused,
                         void *data)
 {
     struct metricgroup_add_iter_data *d = data;
     int ret;
 
     if (!match_pe_metric(pe, d->metric_name))
         return 0;
 
     ret = add_metric(d->metric_list, pe, d->modifier, d->metric_no_group,
              d->root_metric, d->visited, d->table);
     if (ret)
         goto out;
 
     *(d->has_match) = true;
 
 out:
     *(d->ret) = ret;
     return ret;
 }
 
 /**
  * metric_list_cmp - list_sort comparator that sorts metrics with more events to
  *                   the front. tool events are excluded from the count.
  */
 static int metric_list_cmp(void *priv __maybe_unused, const struct list_head *l,
                const struct list_head *r)
 {
     const struct metric *left = container_of(l, struct metric, nd);
     const struct metric *right = container_of(r, struct metric, nd);
     struct expr_id_data *data;
     int i, left_count, right_count;
 
     left_count = hashmap__size(left->pctx->ids);
     perf_tool_event__for_each_event(i) {
         if (!expr__get_id(left->pctx, perf_tool_event__to_str(i), &data))
             left_count--;
     }
 
     right_count = hashmap__size(right->pctx->ids);
     perf_tool_event__for_each_event(i) {
         if (!expr__get_id(right->pctx, perf_tool_event__to_str(i), &data))
             right_count--;
     }
 
     return right_count - left_count;
 }
 
 struct metricgroup__add_metric_data {
     struct list_head *list;
     const char *metric_name;
     const char *modifier;
     bool metric_no_group;
     bool has_match;
 };
 
 static int metricgroup__add_metric_callback(const struct pmu_event *pe,
                         const struct pmu_events_table *table,
                         void *vdata)
 {
     struct metricgroup__add_metric_data *data = vdata;
     int ret = 0;
 
     if (pe->metric_expr &&
         (match_metric(pe->metric_group, data->metric_name) ||
          match_metric(pe->metric_name, data->metric_name))) {
 
         data->has_match = true;
         ret = add_metric(data->list, pe, data->modifier, data->metric_no_group,
                  /*root_metric=*/NULL,
                  /*visited_metrics=*/NULL, table);
     }
     return ret;
 }
 
 /**
  * metricgroup__add_metric - Find and add a metric, or a metric group.
  * @metric_name: The name of the metric or metric group. For example, "IPC"
  *               could be the name of a metric and "TopDownL1" the name of a
  *               metric group.
  * @modifier: if non-null event modifiers like "u".
  * @metric_no_group: Should events written to events be grouped "{}" or
  *                   global. Grouping is the default but due to multiplexing the
  *                   user may override.
  * @metric_list: The list that the metric or metric group are added to.
  * @table: The table that is searched for metrics, most commonly the table for the
  *       architecture perf is running upon.
  */
 static int metricgroup__add_metric(const char *metric_name, const char *modifier,
                    bool metric_no_group,
                    struct list_head *metric_list,
                    const struct pmu_events_table *table)
 {
     LIST_HEAD(list);
     int ret;
     bool has_match = false;
 
     {
         struct metricgroup__add_metric_data data = {
             .list = &list,
             .metric_name = metric_name,
             .modifier = modifier,
             .metric_no_group = metric_no_group,
             .has_match = false,
         };
         /*
          * Iterate over all metrics seeing if metric matches either the
          * name or group. When it does add the metric to the list.
          */
         ret = pmu_events_table_for_each_event(table, metricgroup__add_metric_callback,
                               &data);
         if (ret)
             goto out;
 
         has_match = data.has_match;
     }
     {
         struct metricgroup_iter_data data = {
             .fn = metricgroup__add_metric_sys_event_iter,
             .data = (void *) &(struct metricgroup_add_iter_data) {
                 .metric_list = &list,
                 .metric_name = metric_name,
                 .modifier = modifier,
                 .metric_no_group = metric_no_group,
                 .has_match = &has_match,
                 .ret = &ret,
                 .table = table,
             },
         };
 
         pmu_for_each_sys_event(metricgroup__sys_event_iter, &data);
     }
     /* End of pmu events. */
     if (!has_match)
         ret = -EINVAL;
 
 out:
     /*
      * add to metric_list so that they can be released
      * even if it's failed
      */
     list_splice(&list, metric_list);
     return ret;
 }
 
 /**
  * metricgroup__add_metric_list - Find and add metrics, or metric groups,
  *                                specified in a list.
  * @list: the list of metrics or metric groups. For example, "IPC,CPI,TopDownL1"
  *        would match the IPC and CPI metrics, and TopDownL1 would match all
  *        the metrics in the TopDownL1 group.
  * @metric_no_group: Should events written to events be grouped "{}" or
  *                   global. Grouping is the default but due to multiplexing the
  *                   user may override.
  * @metric_list: The list that metrics are added to.
  * @table: The table that is searched for metrics, most commonly the table for the
  *       architecture perf is running upon.
  */
 static int metricgroup__add_metric_list(const char *list, bool metric_no_group,
                     struct list_head *metric_list,
                     const struct pmu_events_table *table)
 {
     char *list_itr, *list_copy, *metric_name, *modifier;
     int ret, count = 0;
 
     list_copy = strdup(list);
     if (!list_copy)
         return -ENOMEM;
     list_itr = list_copy;
 
     while ((metric_name = strsep(&list_itr, ",")) != NULL) {
         modifier = strchr(metric_name, ':');
         if (modifier)
             *modifier++ = '\0';
 
         ret = metricgroup__add_metric(metric_name, modifier,
                           metric_no_group, metric_list,
                           table);
         if (ret == -EINVAL)
             pr_err("Cannot find metric or group `%s'\n", metric_name);
 
         if (ret)
             break;
 
         count++;
     }
     free(list_copy);
 
     if (!ret) {
         /*
          * Warn about nmi_watchdog if any parsed metrics had the
          * NO_NMI_WATCHDOG constraint.
          */
         metricgroup___watchdog_constraint_hint(NULL, true);
         /* No metrics. */
         if (count == 0)
             return -EINVAL;
     }
     return ret;
 }
 
 static void metricgroup__free_metrics(struct list_head *metric_list)
 {
     struct metric *m, *tmp;
 
     list_for_each_entry_safe (m, tmp, metric_list, nd) {
         list_del_init(&m->nd);
         metric__free(m);
     }
 }
 
 /**
  * find_tool_events - Search for the pressence of tool events in metric_list.
  * @metric_list: List to take metrics from.
  * @tool_events: Array of false values, indices corresponding to tool events set
  *               to true if tool event is found.
  */
 static void find_tool_events(const struct list_head *metric_list,
                  bool tool_events[PERF_TOOL_MAX])
 {
     struct metric *m;
 
     list_for_each_entry(m, metric_list, nd) {
         int i;
 
         perf_tool_event__for_each_event(i) {
             struct expr_id_data *data;
 
             if (!tool_events[i] &&
                 !expr__get_id(m->pctx, perf_tool_event__to_str(i), &data))
                 tool_events[i] = true;
         }
     }
 }
 
 /**
  * build_combined_expr_ctx - Make an expr_parse_ctx with all has_constraint
  *                           metric IDs, as the IDs are held in a set,
  *                           duplicates will be removed.
  * @metric_list: List to take metrics from.
  * @combined: Out argument for result.
  */
 static int build_combined_expr_ctx(const struct list_head *metric_list,
                    struct expr_parse_ctx **combined)
 {
     struct hashmap_entry *cur;
     size_t bkt;
     struct metric *m;
     char *dup;
     int ret;
 
     *combined = expr__ctx_new();
     if (!*combined)
         return -ENOMEM;
 
     list_for_each_entry(m, metric_list, nd) {
         if (m->has_constraint && !m->modifier) {
             hashmap__for_each_entry(m->pctx->ids, cur, bkt) {
                 dup = strdup(cur->key);
                 if (!dup) {
                     ret = -ENOMEM;
                     goto err_out;
                 }
                 ret = expr__add_id(*combined, dup);
                 if (ret)
                     goto err_out;
             }
         }
     }
     return 0;
 err_out:
     expr__ctx_free(*combined);
     *combined = NULL;
     return ret;
 }
 
 /**
  * parse_ids - Build the event string for the ids and parse them creating an
  *             evlist. The encoded metric_ids are decoded.
  * @metric_no_merge: is metric sharing explicitly disabled.
  * @fake_pmu: used when testing metrics not supported by the current CPU.
  * @ids: the event identifiers parsed from a metric.
  * @modifier: any modifiers added to the events.
  * @has_constraint: false if events should be placed in a weak group.
  * @tool_events: entries set true if the tool event of index could be present in
  *               the overall list of metrics.
  * @out_evlist: the created list of events.
  */
 static int parse_ids(bool metric_no_merge, struct perf_pmu *fake_pmu,
              struct expr_parse_ctx *ids, const char *modifier,
              bool has_constraint, const bool tool_events[PERF_TOOL_MAX],
              struct evlist **out_evlist)
 {
     struct parse_events_error parse_error;
     struct evlist *parsed_evlist;
     struct strbuf events = STRBUF_INIT;
     int ret;
 
     *out_evlist = NULL;
     if (!metric_no_merge || hashmap__size(ids->ids) == 0) {
         bool added_event = false;
         int i;
         /*
          * We may fail to share events between metrics because a tool
          * event isn't present in one metric. For example, a ratio of
          * cache misses doesn't need duration_time but the same events
          * may be used for a misses per second. Events without sharing
          * implies multiplexing, that is best avoided, so place
          * all tool events in every group.
          *
          * Also, there may be no ids/events in the expression parsing
          * context because of constant evaluation, e.g.:
          *    event1 if #smt_on else 0
          * Add a tool event to avoid a parse error on an empty string.
          */
         perf_tool_event__for_each_event(i) {
             if (tool_events[i]) {
                 char *tmp = strdup(perf_tool_event__to_str(i));
 
                 if (!tmp)
                     return -ENOMEM;
                 ids__insert(ids->ids, tmp);
                 added_event = true;
             }
         }
         if (!added_event && hashmap__size(ids->ids) == 0) {
             char *tmp = strdup("duration_time");
 
             if (!tmp)
                 return -ENOMEM;
             ids__insert(ids->ids, tmp);
         }
     }
     ret = metricgroup__build_event_string(&events, ids, modifier,
                           has_constraint);
     if (ret)
         return ret;
 
     parsed_evlist = evlist__new();
     if (!parsed_evlist) {
         ret = -ENOMEM;
         goto err_out;
     }
     pr_debug("Parsing metric events '%s'\n", events.buf);
     parse_events_error__init(&parse_error);
     ret = __parse_events(parsed_evlist, events.buf, &parse_error, fake_pmu);
     if (ret) {
         parse_events_error__print(&parse_error, events.buf);
         goto err_out;
     }
     ret = decode_all_metric_ids(parsed_evlist, modifier);
     if (ret)
         goto err_out;
 
     *out_evlist = parsed_evlist;
     parsed_evlist = NULL;
 err_out:
     parse_events_error__exit(&parse_error);
     evlist__delete(parsed_evlist);
     strbuf_release(&events);
     return ret;
 }
 
 static int parse_groups(struct evlist *perf_evlist, const char *str,
             bool metric_no_group,
             bool metric_no_merge,
             struct perf_pmu *fake_pmu,
             struct rblist *metric_events_list,
             const struct pmu_events_table *table)
 {
     struct evlist *combined_evlist = NULL;
     LIST_HEAD(metric_list);
     struct metric *m;
     bool tool_events[PERF_TOOL_MAX] = {false};
     int ret;
 
     if (metric_events_list->nr_entries == 0)
         metricgroup__rblist_init(metric_events_list);
     ret = metricgroup__add_metric_list(str, metric_no_group,
                        &metric_list, table);
     if (ret)
         goto out;
 
     /* Sort metrics from largest to smallest. */
     list_sort(NULL, &metric_list, metric_list_cmp);
 
     if (!metric_no_merge) {
         struct expr_parse_ctx *combined = NULL;
 
         find_tool_events(&metric_list, tool_events);
 
         ret = build_combined_expr_ctx(&metric_list, &combined);
 
         if (!ret && combined && hashmap__size(combined->ids)) {
             ret = parse_ids(metric_no_merge, fake_pmu, combined,
                     /*modifier=*/NULL,
                     /*has_constraint=*/true,
                     tool_events,
                     &combined_evlist);
         }
         if (combined)
             expr__ctx_free(combined);
 
         if (ret)
             goto out;
     }
 
     list_for_each_entry(m, &metric_list, nd) {
         struct metric_event *me;
         struct evsel **metric_events;
         struct evlist *metric_evlist = NULL;
         struct metric *n;
         struct metric_expr *expr;
 
         if (combined_evlist && m->has_constraint) {
             metric_evlist = combined_evlist;
         } else if (!metric_no_merge) {
             /*
              * See if the IDs for this metric are a subset of an
              * earlier metric.
              */
             list_for_each_entry(n, &metric_list, nd) {
                 if (m == n)
                     break;
 
                 if (n->evlist == NULL)
                     continue;
 
                 if ((!m->modifier && n->modifier) ||
                     (m->modifier && !n->modifier) ||
                     (m->modifier && n->modifier &&
                         strcmp(m->modifier, n->modifier)))
                     continue;
 
                 if (expr__subset_of_ids(n->pctx, m->pctx)) {
                     pr_debug("Events in '%s' fully contained within '%s'\n",
                          m->metric_name, n->metric_name);
                     metric_evlist = n->evlist;
                     break;
                 }
 
             }
         }
         if (!metric_evlist) {
             ret = parse_ids(metric_no_merge, fake_pmu, m->pctx, m->modifier,
                     m->has_constraint, tool_events, &m->evlist);
             if (ret)
                 goto out;
 
             metric_evlist = m->evlist;
         }
         ret = setup_metric_events(m->pctx->ids, metric_evlist, &metric_events);
         if (ret) {
             pr_debug("Cannot resolve IDs for %s: %s\n",
                 m->metric_name, m->metric_expr);
             goto out;
         }
 
         me = metricgroup__lookup(metric_events_list, metric_events[0], true);
 
         expr = malloc(sizeof(struct metric_expr));
         if (!expr) {
             ret = -ENOMEM;
             free(metric_events);
             goto out;
         }
 
         expr->metric_refs = m->metric_refs;
         m->metric_refs = NULL;
         expr->metric_expr = m->metric_expr;
         if (m->modifier) {
             char *tmp;
 
             if (asprintf(&tmp, "%s:%s", m->metric_name, m->modifier) < 0)
                 expr->metric_name = NULL;
             else
                 expr->metric_name = tmp;
         } else
             expr->metric_name = strdup(m->metric_name);
 
         if (!expr->metric_name) {
             ret = -ENOMEM;
             free(metric_events);
             goto out;
         }
         expr->metric_unit = m->metric_unit;
         expr->metric_events = metric_events;
         expr->runtime = m->pctx->runtime;
         list_add(&expr->nd, &me->head);
     }
 
 
     if (combined_evlist) {
         evlist__splice_list_tail(perf_evlist, &combined_evlist->core.entries);
         evlist__delete(combined_evlist);
     }
 
     list_for_each_entry(m, &metric_list, nd) {
         if (m->evlist)
             evlist__splice_list_tail(perf_evlist, &m->evlist->core.entries);
     }
 
 out:
     metricgroup__free_metrics(&metric_list);
     return ret;
 }
 
 int metricgroup__parse_groups(const struct option *opt,
                   const char *str,
                   bool metric_no_group,
                   bool metric_no_merge,
                   struct rblist *metric_events)
 {
     struct evlist *perf_evlist = *(struct evlist **)opt->value;
     const struct pmu_events_table *table = pmu_events_table__find();
 
     if (!table)
         return -EINVAL;
 
     return parse_groups(perf_evlist, str, metric_no_group,
                 metric_no_merge, NULL, metric_events, table);
 }
 
 int metricgroup__parse_groups_test(struct evlist *evlist,
                    const struct pmu_events_table *table,
                    const char *str,
                    bool metric_no_group,
                    bool metric_no_merge,
                    struct rblist *metric_events)
 {
     return parse_groups(evlist, str, metric_no_group,
                 metric_no_merge, &perf_pmu__fake, metric_events, table);
 }
 
 static int metricgroup__has_metric_callback(const struct pmu_event *pe,
                         const struct pmu_events_table *table __maybe_unused,
                         void *vdata)
 {
     const char *metric = vdata;
 
     if (!pe->metric_expr)
         return 0;
 
     if (match_metric(pe->metric_name, metric))
         return 1;
 
     return 0;
 }
 
 bool metricgroup__has_metric(const char *metric)
 {
     const struct pmu_events_table *table = pmu_events_table__find();
 
     if (!table)
         return false;
 
     return pmu_events_table_for_each_event(table, metricgroup__has_metric_callback,
                            (void *)metric) ? true : false;
 }
 
 int metricgroup__copy_metric_events(struct evlist *evlist, struct cgroup *cgrp,
                     struct rblist *new_metric_events,
                     struct rblist *old_metric_events)
 {
     unsigned i;
 
     for (i = 0; i < rblist__nr_entries(old_metric_events); i++) {
         struct rb_node *nd;
         struct metric_event *old_me, *new_me;
         struct metric_expr *old_expr, *new_expr;
         struct evsel *evsel;
         size_t alloc_size;
         int idx, nr;
 
         nd = rblist__entry(old_metric_events, i);
         old_me = container_of(nd, struct metric_event, nd);
 
         evsel = evlist__find_evsel(evlist, old_me->evsel->core.idx);
         if (!evsel)
             return -EINVAL;
         new_me = metricgroup__lookup(new_metric_events, evsel, true);
         if (!new_me)
             return -ENOMEM;
 
         pr_debug("copying metric event for cgroup '%s': %s (idx=%d)\n",
              cgrp ? cgrp->name : "root", evsel->name, evsel->core.idx);
 
         list_for_each_entry(old_expr, &old_me->head, nd) {
             new_expr = malloc(sizeof(*new_expr));
             if (!new_expr)
                 return -ENOMEM;
 
             new_expr->metric_expr = old_expr->metric_expr;
             new_expr->metric_name = strdup(old_expr->metric_name);
             if (!new_expr->metric_name)
                 return -ENOMEM;
 
             new_expr->metric_unit = old_expr->metric_unit;
             new_expr->runtime = old_expr->runtime;
 
             if (old_expr->metric_refs) {
                 /* calculate number of metric_events */
                 for (nr = 0; old_expr->metric_refs[nr].metric_name; nr++)
                     continue;
                 alloc_size = sizeof(*new_expr->metric_refs);
                 new_expr->metric_refs = calloc(nr + 1, alloc_size);
                 if (!new_expr->metric_refs) {
                     free(new_expr);
                     return -ENOMEM;
                 }
 
                 memcpy(new_expr->metric_refs, old_expr->metric_refs,
                        nr * alloc_size);
             } else {
                 new_expr->metric_refs = NULL;
             }
 
             /* calculate number of metric_events */
             for (nr = 0; old_expr->metric_events[nr]; nr++)
                 continue;
             alloc_size = sizeof(*new_expr->metric_events);
             new_expr->metric_events = calloc(nr + 1, alloc_size);
             if (!new_expr->metric_events) {
                 free(new_expr->metric_refs);
                 free(new_expr);
                 return -ENOMEM;
             }
 
             /* copy evsel in the same position */
             for (idx = 0; idx < nr; idx++) {
                 evsel = old_expr->metric_events[idx];
                 evsel = evlist__find_evsel(evlist, evsel->core.idx);
                 if (evsel == NULL) {
                     free(new_expr->metric_events);
                     free(new_expr->metric_refs);
                     free(new_expr);
                     return -EINVAL;
                 }
                 new_expr->metric_events[idx] = evsel;
             }
 
             list_add(&new_expr->nd, &new_me->head);
         }
     }
     return 0;
 }

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