Commit-ID: 011dccbdd93b7022c5c67e7c55fa8b5030b5e03d
Gitweb: http://git.kernel.org/tip/011dccbdd93b7022c5c67e7c55fa8b5030b5e03d
Author: Jiri Olsa <jolsa@xxxxxxxxxx>
AuthorDate: Fri, 21 Nov 2014 10:31:07 +0100
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Mon, 24 Nov 2014 18:03:50 -0300
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@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Corey Ashford <cjashfor@xxxxxxxxxxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Matt Fleming <matt.fleming@xxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1416562275-12404-4-git-send-email-jolsa@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/util/evsel.c | 16 ++++++++++++++++
tools/perf/util/evsel.h | 7 +++++++
2 files changed, 23 insertions(+)
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 6dc7a67..2d26b7a 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -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)
{
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 7af0377..5c93bed 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -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);
--
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