linux-kernel - [PATCH 24/45] perf stat record: Write stat events on record

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Date:	Wed, 30 Sep 2015 16:10:37 +0200
From:	Jiri Olsa <jolsa@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Liang, Kan" <kan.liang@...el.com>
Subject: [PATCH 24/45] perf stat record: Write stat events on record

Writing stat events on 'perf stat record' at the time
we read counter values from kernel.

Link: http://lkml.kernel.org/n/tip-ojc826gy0x9jj74elbjfccej@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/builtin-stat.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 74aac55ff24a..898d4042310c 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -205,6 +205,18 @@ static int process_synthesized_event(struct perf_tool *tool __maybe_unused,
 	return 0;
 }
 
+#define SID(e, x, y) xyarray__entry(e->sample_id, x, y)
+
+static int
+perf_evsel__write_stat_event(struct perf_evsel *counter, u32 cpu, u32 thread,
+			     struct perf_counts_values *count)
+{
+	struct perf_sample_id *sid = SID(counter, cpu, thread);
+
+	return perf_event__synthesize_stat(NULL, cpu, thread, sid->id, count,
+					   process_synthesized_event, NULL);
+}
+
 /*
  * Read out the results of a single counter:
  * do not aggregate counts across CPUs in system-wide mode
@@ -228,6 +240,13 @@ static int read_counter(struct perf_evsel *counter)
 			count = perf_counts(counter->counts, cpu, thread);
 			if (perf_evsel__read(counter, cpu, thread, count))
 				return -1;
+
+			if (STAT_RECORD) {
+				if (perf_evsel__write_stat_event(counter, cpu, thread, count)) {
+					pr_err("failed to write stat event\n");
+					return -1;
+				}
+			}
 		}
 	}
 
-- 
2.4.3

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