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perf evsel: Introduce perf_evsel__read_cb function

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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>
This commit is contained in:
Jiri Olsa 2014-11-21 10:31:07 +01:00 committed by Arnaldo Carvalho de Melo
parent 13112bbf59
commit 011dccbdd9
2 changed files with 23 additions and 0 deletions
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16
tools/perf/util/evsel.c
View file

@ -917,6 +917,22 @@ void perf_counts_values__scale(struct perf_counts_values *count,
*pscaled = scaled;
}
int perf_evsel__read_cb(struct perf_evsel *evsel, int cpu, int thread,
perf_evsel__read_cb_t cb)
{
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 cb(evsel, cpu, thread, &count);
}
int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
int cpu, int thread, bool scale)
{

7
tools/perf/util/evsel.h
View file

@ -233,6 +233,13 @@ static inline bool perf_evsel__match2(struct perf_evsel *e1,
(a)->attr.type == (b)->attr.type && \
(a)->attr.config == (b)->attr.config)
typedef int (perf_evsel__read_cb_t)(struct perf_evsel *evsel,
int cpu, int thread,
struct perf_counts_values *count);
int perf_evsel__read_cb(struct perf_evsel *evsel, int cpu, int thread,
perf_evsel__read_cb_t cb);
int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
int cpu, int thread, bool scale);