linux-kernel - Re: [PATCHSET 0/8] perf tools: Fix scalability problem on callchain merging (v4)

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Message-ID: <87eh8bovzq.fsf@sejong.aot.lge.com>
Date:	Fri, 27 Sep 2013 11:10:17 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	David Ahern <dsahern@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCHSET 0/8] perf tools: Fix scalability problem on callchain merging (v4)

Hi,

On Thu, 26 Sep 2013 11:07:49 -0300, Arnaldo Carvalho de Melo wrote:
> Em Thu, Sep 26, 2013 at 07:46:36AM -0600, David Ahern escreveu:
>> On 9/26/13 2:58 AM, Namhyung Kim wrote:
>> >This is a new version of callchain improvement patchset.  I found and
>> >fixed bugs in the previous version.  I verified that it produced
>> >exactly same output before and after applying rbtree conversion patch
>> >(#1).  However after Frederic's new comm infrastructure patches are
>> >applied it'd be little different.
>
>> >The patches are on 'perf/callchain-v4' branch in my tree
>
>> >   git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git
>
>> Given recent breakage, has the patchset been run through any tests
>> on older kernels that do not support sample_id_all? e.g., 2.6.34
>> (WRL4). What about tests with the other perf commands -- script to
>> dump events, trace on a file with with multiple processes -- to
>> verify no impact on comm output, especially multithreaded processes
>> with named threads. I can certainly do those tests in time, but
>> can't guarantee a timeframe and want to make sure it gets done
>> before merging.
>
> Right, and I don't think this is perf/urgent material at this point in
> time, when merged will be for 3.13.

Agreed.  It definitely needs more testing.  I'll try to do some testing
mentioned above.

Thanks,
Namhyung
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