tools/perf/util/evlist.c

   1 #include <poll.h>
   2 #include "evlist.h"
   3 #include "evsel.h"
   4 #include "util.h"
   5
   6 struct perf_evlist *perf_evlist__new(void)
   7 {
   8         struct perf_evlist *evlist = zalloc(sizeof(*evlist));
   9
  10         if (evlist != NULL) {
  11                 INIT_LIST_HEAD(&evlist->entries);
  12         }
  13
  14         return evlist;
  15 }
  16
  17 static void perf_evlist__purge(struct perf_evlist *evlist)
  18 {
  19         struct perf_evsel *pos, *n;
  20
  21         list_for_each_entry_safe(pos, n, &evlist->entries, node) {
  22                 list_del_init(&pos->node);
  23                 perf_evsel__delete(pos);
  24         }
  25
  26         evlist->nr_entries = 0;
  27 }
  28
  29 void perf_evlist__delete(struct perf_evlist *evlist)
  30 {
  31         perf_evlist__purge(evlist);
  32         free(evlist->pollfd);
  33         free(evlist);
  34 }
  35
  36 void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
  37 {
  38         list_add_tail(&entry->node, &evlist->entries);
  39         ++evlist->nr_entries;
  40 }
  41
  42 int perf_evlist__add_default(struct perf_evlist *evlist)
  43 {
  44         struct perf_event_attr attr = {
  45                 .type = PERF_TYPE_HARDWARE,
  46                 .config = PERF_COUNT_HW_CPU_CYCLES,
  47         };
  48         struct perf_evsel *evsel = perf_evsel__new(&attr, 0);
  49
  50         if (evsel == NULL)
  51                 return -ENOMEM;
  52
  53         perf_evlist__add(evlist, evsel);
  54         return 0;
  55 }
  56
  57 int perf_evlist__alloc_pollfd(struct perf_evlist *evlist, int ncpus, int nthreads)
  58 {
  59         int nfds = ncpus * nthreads * evlist->nr_entries;
  60         evlist->pollfd = malloc(sizeof(struct pollfd) * nfds);
  61         return evlist->pollfd != NULL ? 0 : -ENOMEM;
  62 }