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: Jiri 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: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -955,6 +955,20 @@ int perf_evsel__read_cb(struct perf_evsel *evsel, int cpu, int thread,
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return cb(evsel, cpu, thread, &count);
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return cb(evsel, cpu, thread, &count);
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}
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}
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int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
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struct perf_counts_values *count)
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{
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memset(count, 0, sizeof(*count));
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if (FD(evsel, cpu, thread) < 0)
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return -EINVAL;
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if (readn(FD(evsel, cpu, thread), count, sizeof(*count)) < 0)
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return -errno;
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return 0;
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}
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int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
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int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
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int cpu, int thread, bool scale)
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int cpu, int thread, bool scale)
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{
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{
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@ -236,6 +236,9 @@ typedef int (perf_evsel__read_cb_t)(struct perf_evsel *evsel,
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int perf_evsel__read_cb(struct perf_evsel *evsel, int cpu, int thread,
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int perf_evsel__read_cb(struct perf_evsel *evsel, int cpu, int thread,
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perf_evsel__read_cb_t cb);
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perf_evsel__read_cb_t cb);
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int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
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struct perf_counts_values *count);
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int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
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int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
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int cpu, int thread, bool scale);
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int cpu, int thread, bool scale);
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