tools/perf/util/evlist.c

   1 #include <poll.h>
   2 #include "evlist.h"
   3 #include "evsel.h"
   4 #include "util.h"
   5
   6 #include <linux/bitops.h>
   7 #include <linux/hash.h>
   8
   9 struct perf_evlist *perf_evlist__new(void)
  10 {
  11         struct perf_evlist *evlist = zalloc(sizeof(*evlist));
  12
  13         if (evlist != NULL) {
  14                 int i;
  15
  16                 for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
  17                         INIT_HLIST_HEAD(&evlist->heads[i]);
  18                 INIT_LIST_HEAD(&evlist->entries);
  19         }
  20
  21         return evlist;
  22 }
  23
  24 static void perf_evlist__purge(struct perf_evlist *evlist)
  25 {
  26         struct perf_evsel *pos, *n;
  27
  28         list_for_each_entry_safe(pos, n, &evlist->entries, node) {
  29                 list_del_init(&pos->node);
  30                 perf_evsel__delete(pos);
  31         }
  32
  33         evlist->nr_entries = 0;
  34 }
  35
  36 void perf_evlist__delete(struct perf_evlist *evlist)
  37 {
  38         perf_evlist__purge(evlist);
  39         free(evlist->mmap);
  40         free(evlist->pollfd);
  41         free(evlist);
  42 }
  43
  44 void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
  45 {
  46         list_add_tail(&entry->node, &evlist->entries);
  47         ++evlist->nr_entries;
  48 }
  49
  50 int perf_evlist__add_default(struct perf_evlist *evlist)
  51 {
  52         struct perf_event_attr attr = {
  53                 .type = PERF_TYPE_HARDWARE,
  54                 .config = PERF_COUNT_HW_CPU_CYCLES,
  55         };
  56         struct perf_evsel *evsel = perf_evsel__new(&attr, 0);
  57
  58         if (evsel == NULL)
  59                 return -ENOMEM;
  60
  61         perf_evlist__add(evlist, evsel);
  62         return 0;
  63 }
  64
  65 int perf_evlist__alloc_pollfd(struct perf_evlist *evlist, int ncpus, int nthreads)
  66 {
  67         int nfds = ncpus * nthreads * evlist->nr_entries;
  68         evlist->pollfd = malloc(sizeof(struct pollfd) * nfds);
  69         return evlist->pollfd != NULL ? 0 : -ENOMEM;
  70 }
  71
  72 void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
  73 {
  74         fcntl(fd, F_SETFL, O_NONBLOCK);
  75         evlist->pollfd[evlist->nr_fds].fd = fd;
  76         evlist->pollfd[evlist->nr_fds].events = POLLIN;
  77         evlist->nr_fds++;
  78 }
  79
  80 struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
  81 {
  82         struct hlist_head *head;
  83         struct hlist_node *pos;
  84         struct perf_sample_id *sid;
  85         int hash;
  86
  87         if (evlist->nr_entries == 1)
  88                 return list_entry(evlist->entries.next, struct perf_evsel, node);
  89
  90         hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
  91         head = &evlist->heads[hash];
  92
  93         hlist_for_each_entry(sid, pos, head, node)
  94                 if (sid->id == id)
  95                         return sid->evsel;
  96         return NULL;
  97 }