linux-kernel - [tip:perf/core] perf evsel: Introduce perf_evsel__read

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Message-ID: <tip-011dccbdd93b7022c5c67e7c55fa8b5030b5e03d@git.kernel.org>
Date:	Sun, 7 Dec 2014 22:50:46 -0800
From:	tip-bot for Jiri Olsa <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, eranian@...gle.com, hpa@...or.com,
	namhyung@...nel.org, cjashfor@...ux.vnet.ibm.com,
	dsahern@...il.com, jolsa@...nel.org, fweisbec@...il.com,
	mingo@...nel.org, ak@...ux.intel.com, acme@...hat.com,
	paulus@...ba.org, a.p.zijlstra@...llo.nl, tglx@...utronix.de,
	matt.fleming@...el.com
Subject: [tip:perf/core] perf evsel:
  Introduce perf_evsel__read_cb function

Commit-ID:  011dccbdd93b7022c5c67e7c55fa8b5030b5e03d
Gitweb:     http://git.kernel.org/tip/011dccbdd93b7022c5c67e7c55fa8b5030b5e03d
Author:     Jiri Olsa <jolsa@...nel.org>
AuthorDate: Fri, 21 Nov 2014 10:31:07 +0100
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
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@...nel.org>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Matt Fleming <matt.fleming@...el.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/r/1416562275-12404-4-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 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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