linux-kernel - Re: [PATCH 12/12] Revert "perf record: Intercept all events"

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Date:	Mon, 25 Jan 2010 23:47:40 +0900
From:	Hitoshi Mitake <mitake@....info.waseda.ac.jp>
To:	Arnaldo Carvalho de Melo <acme@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH 12/12] Revert "perf record: Intercept all events"

On Mon, Jan 25, 2010 at 11:23, Arnaldo Carvalho de Melo
<acme@...radead.org> wrote:
> Em Fri, Jan 22, 2010 at 10:39:13PM +0900, Hitoshi Mitake escreveu:
>> This reverts commit f5a2c3dce03621b55f84496f58adc2d1a87ca16f.
>>
>> This patch is required for making "perf lock rec" work.
>> The commit f5a2c3dce0 changes write_event() of builtin-record.c .
>> And changed write_event() sometimes doesn't stop with perf lock rec.
>>
>> I'm researching what makes write_event() loop infinity,
>> and noticed that there are some events with event_t->header.size == 0.
>> But the detail of the problem,
>> like kind of these events, isn't clear...
>>
>> If you know something related to this problem,
>> could you tell me, Arnaldo?
>
> Well, this will have to wait for somebody to remove the need for
> intercepting those events, reverting this patch fixes your tool while
> breaking others that then won't catch all the events.

Yes, this patch is too egoistic thing and temporary solution.
I have to consider and modify 'perf lock'.

>
> I'll get 'perf regtest' out with some initial tests then try to get some
> proposal for injecting the buildid, if found in a DSO, via
> PERF_RECORD_MMAP, lets see how this goes...

What does "DSO" mean? Sorry, I'm not good at English...

>
> Best Regards,
>
> - Arnaldo
>
> BTW: I took longer to send a response to this question addressed to me
> because I wasn't on the CC list :-)
>
>

Oh, sorry... I wonder why I didn't add you to Cc or To :(
It is completely my mistake, and thanks for your reply!

Thanks
	Hitoshi
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