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Subject: Re: [PATCH] trace: reset sleep/block start time on task switch
From: Steven Rostedt <rostedt@goodmis.org>
To: Arun Sharma <asharma@fb.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>, linux-kernel@vger.kernel.org,
        Arnaldo Carvalho de Melo <acme@infradead.org>,
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Date: Wed, 25 Jan 2012 15:15:58 -0500
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On Wed, 2012-01-25 at 11:50 -0800, Arun Sharma wrote:

> # perf record -agP -e sched:sched_switch --filter "prev_state == 1 || 
> prev_state == 2" -e  sched:sched_stat_sleep -- sleep 3
> [ perf record: Woken up 107 times to write data ]
> [ perf record: Captured and wrote 32.629 MB perf.data (~1425585 samples) ]
> Warning:
> Processed 104066 events and lost 4 chunks!
> 
> Check IO/CPU overload!

Just for kicks, could you try trace-cmd?

git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git

trace-cmd record -e sched_switch -f 'prev_state == 1 || prev_state == 2' -e sched_stat_sleep sleep 3

I'm not sure the filter is even needed, and it should still keep up
fine.

-- Steve