Message-ID: <503BED07.9030404@gmail.com>
Date: Mon, 27 Aug 2012 15:56:23 -0600
From: David Ahern <dsahern@gmail.com>
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To: Andi Kleen <andi@firstfloor.org>
CC: Andrew Vagin <avagin@openvz.org>, linux-kernel@vger.kernel.org,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Paul Mackerras <paulus@samba.org>, Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Subject: Re: [PATCH 3/4] perf: teach perf inject to merge sched_stat_* and
 sched_switch events (v2)
References: <1344344165-369636-1-git-send-email-avagin@openvz.org> <1344344165-369636-4-git-send-email-avagin@openvz.org> <m2ehms6ouh.fsf@firstfloor.org>
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On 8/27/12 2:51 PM, Andi Kleen wrote:
> Andrew Vagin <avagin@openvz.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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