linux-kernel - Re: [PATCH 02/19] perf: Add ability to attach user level registers dump to sample

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Date:	Thu, 14 Jun 2012 12:45:15 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Jiri Olsa <jolsa@...hat.com>, acme@...hat.com, mingo@...e.hu,
	paulus@...ba.org, cjashfor@...ux.vnet.ibm.com, fweisbec@...il.com,
	gorcunov@...nvz.org, tzanussi@...il.com, mhiramat@...hat.com,
	robert.richter@....com, fche@...hat.com,
	linux-kernel@...r.kernel.org, masami.hiramatsu.pt@...achi.com,
	drepper@...il.com, asharma@...com, benjamin.redelings@...cent.org
Subject: Re: [PATCH 02/19] perf: Add ability to attach user level registers
 dump to sample

On Thu, Jun 14, 2012 at 10:36 AM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> On Wed, 2012-06-13 at 15:41 +0200, Stephane Eranian wrote:
>> Ok, yes that one. It would have been much nicer to follow the enum
>> order.
>
> Yes.. I should make a list of all the things we should've done
> differently. Maybe if that list grows long enough someone gets motivated
> enough to rev the format as a whole.
>
Yeah, that would be good.

I will soon post a patch to extend that format to make it possible to
have distinct sample_type per event and yet be able to parse them.
I am still waiting for Arnaldo to take my perf patches concerning pipe
mode first. Can't have too many patch sets in flight at the same time.

> It would be a tedious endeavour since you'd need to have both output
> paths available for a good while, but it might be worth it in the long
> run depending on how painful the current format becomes.

True. What we don't know however, it how many other tools are out
there using the kernel API directly.
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