linux-kernel - [tip:perf/core] tracing: Use sched_clock_cpu for trace_clock

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Message-ID: <tip-5e67b51e3fb22ad43faf9589e9019ad9c6a00413@git.kernel.org>
Date:	Sun, 3 Feb 2013 11:22:41 -0800
From:	tip-bot for Namhyung Kim <namhyung.kim@....com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	rostedt@...dmis.org, namhyung.kim@....com, tglx@...utronix.de,
	namhyung@...nel.org
Subject: [tip:perf/core] tracing:
  Use sched_clock_cpu for trace_clock_global

Commit-ID:  5e67b51e3fb22ad43faf9589e9019ad9c6a00413
Gitweb:     http://git.kernel.org/tip/5e67b51e3fb22ad43faf9589e9019ad9c6a00413
Author:     Namhyung Kim <namhyung.kim@....com>
AuthorDate: Thu, 27 Dec 2012 11:49:45 +0900
Committer:  Steven Rostedt <rostedt@...dmis.org>
CommitDate: Wed, 30 Jan 2013 11:02:05 -0500

tracing: Use sched_clock_cpu for trace_clock_global

For systems with an unstable sched_clock, all cpu_clock() does is enable/
disable local irq during the call to sched_clock_cpu().  And for stable
systems they are same.

trace_clock_global() already disables interrupts, so it can call
sched_clock_cpu() directly.

Link: http://lkml.kernel.org/r/1356576585-28782-2-git-send-email-namhyung@kernel.org

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
---
 kernel/trace/trace_clock.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/trace_clock.c b/kernel/trace/trace_clock.c
index 22b638b..24bf48e 100644
--- a/kernel/trace/trace_clock.c
+++ b/kernel/trace/trace_clock.c
@@ -84,7 +84,7 @@ u64 notrace trace_clock_global(void)
 	local_irq_save(flags);
 
 	this_cpu = raw_smp_processor_id();
-	now = cpu_clock(this_cpu);
+	now = sched_clock_cpu(this_cpu);
 	/*
 	 * If in an NMI context then dont risk lockups and return the
 	 * cpu_clock() time:
--
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