[PATCH 17/26] perf stat: Introduce perf_evsel__read function
From: Jiri Olsa
Date: Thu Jun 18 2015 - 17:50:50 EST
Adding simple read function that reads/store data
into given struct perf_counts_values *count object.
Link: http://lkml.kernel.org/n/tip-9r2zmzq0vkw8l300usq824sg@xxxxxxxxxxxxxx
Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
---
tools/perf/util/evsel.c | 14 ++++++++++++++
tools/perf/util/evsel.h | 3 +++
2 files changed, 17 insertions(+)
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index cd6ce7066f85..2e0a4e064f44 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -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)
{
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 020f7e13634a..a79944a21e8f 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -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);
--
1.9.3
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/