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Commit 1c65056c authored by Adrian Hunter's avatar Adrian Hunter Committed by Arnaldo Carvalho de Melo
Browse files

perf evlist: Add perf_evlist__enable_event_idx() 



Add a function to enable a specific event within a specific perf event
buffer.

Signed-off-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1406786474-9306-14-git-send-email-adrian.hunter@intel.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent bf493902

tools/perf/util/evlist.c

+47 −0
Original line number Diff line number Diff line
@@ -355,6 +355,53 @@ int perf_evlist__enable_event(struct perf_evlist *evlist, 
	return 0;

}



static int perf_evlist__enable_event_cpu(struct perf_evlist *evlist,

					 struct perf_evsel *evsel, int cpu)

{

	int thread, err;

	int nr_threads = perf_evlist__nr_threads(evlist, evsel);



	if (!evsel->fd)

		return -EINVAL;



	for (thread = 0; thread < nr_threads; thread++) {

		err = ioctl(FD(evsel, cpu, thread),

			    PERF_EVENT_IOC_ENABLE, 0);

		if (err)

			return err;

	}

	return 0;

}



static int perf_evlist__enable_event_thread(struct perf_evlist *evlist,

					    struct perf_evsel *evsel,

					    int thread)

{

	int cpu, err;

	int nr_cpus = cpu_map__nr(evlist->cpus);



	if (!evsel->fd)

		return -EINVAL;



	for (cpu = 0; cpu < nr_cpus; cpu++) {

		err = ioctl(FD(evsel, cpu, thread), PERF_EVENT_IOC_ENABLE, 0);

		if (err)

			return err;

	}

	return 0;

}



int perf_evlist__enable_event_idx(struct perf_evlist *evlist,

				  struct perf_evsel *evsel, int idx)

{

	bool per_cpu_mmaps = !cpu_map__empty(evlist->cpus);



	if (per_cpu_mmaps)

		return perf_evlist__enable_event_cpu(evlist, evsel, idx);

	else

		return perf_evlist__enable_event_thread(evlist, evsel, idx);

}



static int perf_evlist__alloc_pollfd(struct perf_evlist *evlist)

{

	int nr_cpus = cpu_map__nr(evlist->cpus);

tools/perf/util/evlist.h

+2 −0
Original line number Diff line number Diff line
@@ -122,6 +122,8 @@ int perf_evlist__disable_event(struct perf_evlist *evlist, 
			       struct perf_evsel *evsel);

int perf_evlist__enable_event(struct perf_evlist *evlist,

			      struct perf_evsel *evsel);

int perf_evlist__enable_event_idx(struct perf_evlist *evlist,

				  struct perf_evsel *evsel, int idx);



void perf_evlist__set_selected(struct perf_evlist *evlist,

			       struct perf_evsel *evsel);