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Commit f99f4719 authored by Jiri Olsa's avatar Jiri Olsa Committed by Arnaldo Carvalho de Melo
Browse files

perf stat: Introduce perf_evsel__read function 



Adding simple read function that reads/store data into given struct
perf_counts_values *count object.

Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1435310967-14570-14-git-send-email-jolsa@kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent a7d0a102

tools/perf/util/evsel.c

+14 −0
Original line number Diff line number Diff line
@@ -955,6 +955,20 @@ int perf_evsel__read_cb(struct perf_evsel *evsel, int cpu, int thread, 
	return cb(evsel, cpu, thread, &count);

}



int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,

		     struct perf_counts_values *count)

{

	memset(count, 0, sizeof(*count));



	if (FD(evsel, cpu, thread) < 0)

		return -EINVAL;



	if (readn(FD(evsel, cpu, thread), count, sizeof(*count)) < 0)

		return -errno;



	return 0;

}



int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,

			      int cpu, int thread, bool scale)

{

tools/perf/util/evsel.h

+3 −0
Original line number Diff line number Diff line
@@ -236,6 +236,9 @@ typedef int (perf_evsel__read_cb_t)(struct perf_evsel *evsel, 
int perf_evsel__read_cb(struct perf_evsel *evsel, int cpu, int thread,

			perf_evsel__read_cb_t cb);



int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,

		     struct perf_counts_values *count);



int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,

			      int cpu, int thread, bool scale);