linux-kernel - Re: [PATCH 3/4] perf: teach perf inject to merge sched_stat_* and sched

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Message-ID: <503BED07.9030404@gmail.com>
Date:	Mon, 27 Aug 2012 15:56:23 -0600
From:	David Ahern <dsahern@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Andrew Vagin <avagin@...nvz.org>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: [PATCH 3/4] perf: teach perf inject to merge sched_stat_* and
 sched_switch events (v2)

On 8/27/12 2:51 PM, Andi Kleen wrote:
> Andrew Vagin <avagin@...nvz.org> writes:
>>
>> My code saves sched_switch event for each process and when it meets
>> stat_iowait, it reports the sched_switch event, because this event
>> contains a correct callchain. By another words it replaces all
>> stat_iowait events on proper sched_switch events.
>
> Is there any way to generalize this to arbitary events? I found myself
> writing scripts to compute lengths between various events.  But I

You mean delta-time between events? I have toyed around with patches to 
perf-script for this -- dt between same event on a cpu, dt between 
consecutive events on a cpu, dt between events for a thread, etc.

David


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