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perf evsel: Introduce perf_evsel__read_cb function
Adding perf_evsel__read_cb read function that retuns count values via callback. It will be used later in stat command as single way to retrieve counter values. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Cc: Andi Kleen <ak@linux.intel.com> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Matt Fleming <matt.fleming@intel.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1416562275-12404-4-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -917,6 +917,22 @@ void perf_counts_values__scale(struct perf_counts_values *count,
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*pscaled = scaled;
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}
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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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{
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struct perf_counts_values count;
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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 cb(evsel, cpu, thread, &count);
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}
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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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{
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@ -233,6 +233,13 @@ static inline bool perf_evsel__match2(struct perf_evsel *e1,
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(a)->attr.type == (b)->attr.type && \
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(a)->attr.config == (b)->attr.config)
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typedef int (perf_evsel__read_cb_t)(struct perf_evsel *evsel,
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int cpu, int thread,
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struct perf_counts_values *count);
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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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int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
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int cpu, int thread, bool scale);
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