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Commit 83509565 authored by Adrian Hunter's avatar Adrian Hunter Committed by Arnaldo Carvalho de Melo
Browse files

perf tools: Add a helper function to probe whether cpu-wide tracing is possible 



Add a helper function to probe whether cpu-wide tracing is possible.

Signed-off-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1439458857-30636-2-git-send-email-adrian.hunter@intel.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent f0ee3b46

tools/perf/util/evlist.h

+1 −0
Original line number Diff line number Diff line
@@ -115,6 +115,7 @@ void perf_evlist__close(struct perf_evlist *evlist); 
void perf_evlist__set_id_pos(struct perf_evlist *evlist);

bool perf_can_sample_identifier(void);

bool perf_can_record_switch_events(void);

bool perf_can_record_cpu_wide(void);

void perf_evlist__config(struct perf_evlist *evlist, struct record_opts *opts);

int record_opts__config(struct record_opts *opts);

tools/perf/util/record.c

+24 −0
Original line number Diff line number Diff line
@@ -105,6 +105,30 @@ bool perf_can_record_switch_events(void) 
	return perf_probe_api(perf_probe_context_switch);

}



bool perf_can_record_cpu_wide(void)

{

	struct perf_event_attr attr = {

		.type = PERF_TYPE_SOFTWARE,

		.config = PERF_COUNT_SW_CPU_CLOCK,

		.exclude_kernel = 1,

	};

	struct cpu_map *cpus;

	int cpu, fd;



	cpus = cpu_map__new(NULL);

	if (!cpus)

		return false;

	cpu = cpus->map[0];

	cpu_map__put(cpus);



	fd = sys_perf_event_open(&attr, -1, cpu, -1, 0);

	if (fd < 0)

		return false;

	close(fd);



	return true;

}



void perf_evlist__config(struct perf_evlist *evlist, struct record_opts *opts)

{

	struct perf_evsel *evsel;