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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: Adrian 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: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2014-07-31 09:00:56 +03:00 committed by Arnaldo Carvalho de Melo
parent bf4939027d
commit 1c65056c54
2 changed files with 49 additions and 0 deletions
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47
tools/perf/util/evlist.c
View File

@ -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);

2
tools/perf/util/evlist.h
View File

@ -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);