linux-kernel - Re: Using perf to locate source of context switches

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Message-ID: <529F78D4.10905@gmail.com>
Date:	Wed, 04 Dec 2013 11:47:48 -0700
From:	David Ahern <dsahern@...il.com>
To:	"Pavey, Nicholas" <npavey@...mai.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Using perf to locate source of context switches

On 12/4/13, 10:42 AM, Pavey, Nicholas wrote:
> NB: I have also used 'perf record -e cs -g -a -- sleep 2', while the

Add -c 1 to capture *all* context switch events.

perf script will show each event. perf report provides a histogram summary.

I have a time-history command for analyzing scheduling events. It is not 
yet in upstream code. You can try the code in this branch:

https://github.com/dsahern/linux/tree/perf-sched-timehist-3.11

Or download this version (requires Arnaldo's tree):
https://lkml.org/lkml/2013/11/18/555

David
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