linux-kernel - Re: [PATCH v3 0/3] perf: add option to limit callchain stack scan to increase speed

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Date:	Tue, 22 Oct 2013 18:07:05 +0000
From:	Namhyung Kim <namhyung@...nel.org>
To:	Waiman Long <Waiman.Long@...com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>,
	linux-kernel@...r.kernel.org,
	Aswin Chandramouleeswaran <aswin@...com>,
	Scott J Norton <scott.norton@...com>,
	Davidlohr Bueso <davidlohr@...com>
Subject: Re: [PATCH v3 0/3] perf: add option to limit callchain stack scan to increase speed

Hi Waiman,

On Mon, 21 Oct 2013 11:03:36 -0400, Waiman Long wrote:
> v2->v3:
>  - Fix the commit log in the second patch which causes "git am" to fail.
>  - Remove the 1st patch in v2 as the problem will be fixed by another
>    patch from Arnaldo.
>
> v1->v2:
>  - Include a compilation fix patch and a code streamlining patch
>    into the patch set.
>  - Use the __stringify() macro in stringify.h instead of adding a
>    duplicate macro.
>  - Add the --max-stack option to perf-top as well.
>
> This perf patch set contains the following changes:
>
> Patch 1 - Streamline the append_chain() function to make it run a bit
>           faster.
> Patch 2 - Add a --max-stack option to perf-report to speed up its
>           processing at the expense of less backtrace information
>           available.
> Patch 3 - Add a similar --max-stack option to perf-top.

At first, thank you for tackling this.  It was really a problem using
callchain on non trivial perf session.  But there's another effort to
address this problem in other direction.  You might want to see below
link [1].  Patch 1/8 does the thing and it seems Arnaldo already merged
it into his tree.

Arnaldo, is there any issue prevents others from being merged?

[1] https://lkml.org/lkml/2013/10/11/16

Thanks,
Namhyung
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