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Subject[PATCH v3 0/4] ftrace: add tracepoint for timer event
Hi,

We can monitor timer's lifecycle and behaviors by these tracepoint.

Following tracepoints are introduced as ingo's suggestion in
http://marc.info/?l=linux-kernel&m=123791899529128&w=2

for timer:
trace_timer_init()
trace_timer_start()
trace_timer_expire()
trace_timer_cancel()

for hrtimer:
trace_hrtimer_init()
trace_hrtimer_start()
trace_hrtimer_expire()
trace_hrtimer_cancel()

for itimer:
itimer_state
itimer_expire()

Changlog from latest patchset:
1: ours patches are base on Anton Blanchard's patch which can been found
at:
http://marc.info/?l=linux-kernel&m=124331396919301&w=2
but this patch is can't apply on Ingo's tip tree, so we rebase this
patch against latest tip tree

2: fix those patches address Thomas's comment


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