linux-kernel - [PATCH] ftrace: Provide trace clock monotonic raw

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Message-Id: <1430750469-16428-1-git-send-email-drew.richardson@arm.com>
Date:	Mon,  4 May 2015 07:41:09 -0700
From:	Drew Richardson <drew.richardson@....com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	John Stultz <john.stultz@...aro.org>,
	Wade Cherry <wade.cherry@....com>,
	Drew Richardson <drew.richardson@....com>
Subject: [PATCH] ftrace: Provide trace clock monotonic raw

Expose the NMI safe accessor to the monotonic raw clock to the
tracer. The mono clock was added with commit
1b3e5c0936046e7e023149ddc8946d21c2ea20eb. Although the monotonic raw
clock cannot be used to compare time between different machines, it is
not perterbed by ntp.

Signed-off-by: Drew Richardson <drew.richardson@....com>
---
 kernel/trace/trace.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 05330494a0df..458031c31a37 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -876,6 +876,7 @@ static struct {
 	{ trace_clock_jiffies,		"uptime",	0 },
 	{ trace_clock,			"perf",		1 },
 	{ ktime_get_mono_fast_ns,	"mono",		1 },
+	{ ktime_get_raw_fast_ns,	"mono_raw",	1 },
 	ARCH_TRACE_CLOCKS
 };
 
-- 
2.1.4

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