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authorDrew Richardson <drew.richardson@arm.com>2015-05-08 07:30:39 -0700
committerSteven Rostedt <rostedt@goodmis.org>2015-05-12 15:58:58 -0400
commitaabfa5f28f717d3e53102ab088e9cc903741221a (patch)
tree3eadb2084239528063aa54219d93de7823784094 /kernel/trace
parent7e255d346c12888f7cce4b89a03a5fe5e9196ab1 (diff)
downloadlinux-aabfa5f28f717d3e53102ab088e9cc903741221a.tar.bz2
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. The advantage of the monotonic raw clock is that it will advance more constantly than the monotonic clock. Imagine someone is trying to optimize a particular program to reduce instructions executed for a given workload while minimizing the effect on runtime. Also suppose that NTP is running and potentially making larger adjustments to the monotonic clock. If NTP is adjusting the monotonic clock to advance more rapidly, the program will appear to use fewer instructions per second but run longer than if the monotonic raw clock had been used. The total number of instructions observed would be the same regardless of the clock source used, but how it's attributed to time would be affected. Conversely if NTP is adjusting the monotonic clock to advance more slowly, the program will appear to use more instructions per second but run more quickly. Of course there are many sources that can cause jitter in performance measurements on modern processors, but let's remove NTP from the list. The monotonic raw clock can also be useful for tracing early boot, e.g. when debugging issues with NTP. Link: http://lkml.kernel.org/r/20150508143037.GB1276@dreric01-Precision-T1650 Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra <peterz@infradead.org> Acked-by: John Stultz <john.stultz@linaro.org> Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Drew Richardson <drew.richardson@arm.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
-rw-r--r--kernel/trace/trace.c1
1 files changed, 1 insertions, 0 deletions
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
};