linux-kernel - [PATCH 8/9] perf: Add a perf trace option to check samples ordering reliability

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Date:	Sat, 24 Apr 2010 04:05:41 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Hitoshi Mitake <mitake@....info.waseda.ac.jp>,
	Ingo Molnar <mingo@...e.hu>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Tom Zanussi <tzanussi@...il.com>
Subject: [PATCH 8/9] perf: Add a perf trace option to check samples ordering reliability

To ensure sample events time reordering is reliable, add a -d option
to perf trace to check that automatically.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Hitoshi Mitake <mitake@....info.waseda.ac.jp>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Masami Hiramatsu <mhiramat@...hat.com>
Cc: Tom Zanussi <tzanussi@...il.com>
---
 tools/perf/builtin-trace.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 1d034f6..77f556f 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -11,6 +11,8 @@
 
 static char const		*script_name;
 static char const		*generate_script_lang;
+static bool			debug_ordering;
+static u64			last_timestamp;
 
 static int default_start_script(const char *script __unused,
 				int argc __unused,
@@ -87,6 +89,14 @@ static int process_sample_event(event_t *event, struct perf_session *session)
 	}
 
 	if (session->sample_type & PERF_SAMPLE_RAW) {
+		if (debug_ordering) {
+			if (data.time < last_timestamp) {
+				pr_err("Samples misordered, previous: %llu "
+					"this: %llu\n", last_timestamp,
+					data.time);
+			}
+			last_timestamp = data.time;
+		}
 		/*
 		 * FIXME: better resolve from pid from the struct trace_entry
 		 * field, although it should be the same than this perf
@@ -532,6 +542,8 @@ static const struct option options[] = {
 		   "generate perf-trace.xx script in specified language"),
 	OPT_STRING('i', "input", &input_name, "file",
 		    "input file name"),
+	OPT_BOOLEAN('d', "debug-ordering", &debug_ordering,
+		   "check that samples time ordering is monotonic"),
 
 	OPT_END()
 };
-- 
1.6.2.3

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