diff options
Diffstat (limited to 'tools/perf/lib')
| -rw-r--r-- | tools/perf/lib/evlist.c | 22 | ||||
| -rw-r--r-- | tools/perf/lib/include/internal/evlist.h | 2 |
2 files changed, 24 insertions, 0 deletions
diff --git a/tools/perf/lib/evlist.c b/tools/perf/lib/evlist.c index 3a16dd0c044f..3c3b97f40be0 100644 --- a/tools/perf/lib/evlist.c +++ b/tools/perf/lib/evlist.c @@ -14,6 +14,7 @@ #include <unistd.h> #include <perf/cpumap.h> #include <perf/threadmap.h> +#include <api/fd/array.h> void perf_evlist__init(struct perf_evlist *evlist) { @@ -238,3 +239,24 @@ add: perf_evlist__id_add(evlist, evsel, cpu, thread, id); return 0; } + +int perf_evlist__alloc_pollfd(struct perf_evlist *evlist) +{ + int nr_cpus = perf_cpu_map__nr(evlist->cpus); + int nr_threads = perf_thread_map__nr(evlist->threads); + int nfds = 0; + struct perf_evsel *evsel; + + perf_evlist__for_each_entry(evlist, evsel) { + if (evsel->system_wide) + nfds += nr_cpus; + else + nfds += nr_cpus * nr_threads; + } + + if (fdarray__available_entries(&evlist->pollfd) < nfds && + fdarray__grow(&evlist->pollfd, nfds) < 0) + return -ENOMEM; + + return 0; +} diff --git a/tools/perf/lib/include/internal/evlist.h b/tools/perf/lib/include/internal/evlist.h index 7d64185cfabd..88c0dfaf0ddc 100644 --- a/tools/perf/lib/include/internal/evlist.h +++ b/tools/perf/lib/include/internal/evlist.h @@ -24,6 +24,8 @@ struct perf_evlist { struct hlist_head heads[PERF_EVLIST__HLIST_SIZE]; }; +int perf_evlist__alloc_pollfd(struct perf_evlist *evlist); + /** * __perf_evlist__for_each_entry - iterate thru all the evsels * @list: list_head instance to iterate |