linux-kernel - [PATCH] perf: fix counter of ftrace events

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Date:	Fri, 16 Sep 2011 19:46:34 +0400
From:	Andrew Vagin <avagin@...nvz.org>
To:	linux-kernel@...r.kernel.org
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, avagin@...nvz.org
Subject: [PATCH] perf: fix counter of ftrace events

Each event adds some points to its counters. By default it adds 1,
and a number of points may be transmited in event's parameters.

E.g. sched:sched_stat_runtime adds how long process has been running.

But this functionality was broken by v2.6.31-rc5-392-gf413cdb
and now the event's parameters doesn't affect on a number of points.

TP_perf_assign isn't defined, so __perf_count(c) isn't executed and
__count is always equal to 1.

Signed-off-by: Andrew Vagin <avagin@...nvz.org>
---
 include/trace/ftrace.h |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 7f89fbf..d6385ee 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -712,6 +712,9 @@ __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
 #undef __perf_count
 #define __perf_count(c) __count = (c)
 
+#undef TP_perf_assign
+#define TP_perf_assign(args...) args
+
 #undef DECLARE_EVENT_CLASS
 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
 static notrace void							\
-- 
1.7.1

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