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From: Namhyung Kim <namhyung@kernel.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Jiri Olsa <jolsa@kernel.org>, LKML <linux-kernel@vger.kernel.org>,
	David Ahern <dsahern@gmail.com>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Wang Nan <wangnan0@huawei.com>,
	Taeung Song <treeze.taeung@gmail.com>
Subject: Re: [RFC/PATCH 10/10] perf tools: Change default calchain percent limit to 0.005%
Date: Thu, 28 Jan 2016 08:34:09 +0900	[thread overview]
Message-ID: <1453937649.11866.2.camel@kernel.org> (raw)
In-Reply-To: <20160127160611.GI31686@two.firstfloor.org>

Hi Andi,

On Wed, 2016-01-27 at 17:06 +0100, Andi Kleen wrote:
> On Thu, Jan 28, 2016 at 12:40:57AM +0900, Namhyung Kim wrote:
> > The current default limit of 0.5% is (mostly) for 'fractal' mode
> > which
> > calculates the percentage relatively.  As we changed the default
> > callchain mode to 'graph', the existing limit is too high IMHO.
> > Normally there're many entries under 0.5% overhead, it'd be
> > supprising
> > that they don't show callchains.
> 
> It's too small imho. On more complex workloads with a lot of user
> space
> code we often end up with default perf report --stdio callgraph output
> of several
> hundred KB, and most of it is useless as it is only very small.

Do you think it's better to keep current default?  Or do you suggest
different value?

Thanks,
Namhyung

  reply	other threads:[~2016-01-27 23:34 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-27 15:40 [PATCHSET 00/10] perf tools: Apply percent-limit to callchains (v2) Namhyung Kim
2016-01-27 15:40 ` [PATCH 01/10] perf hists: Fix min callchain hits calculation Namhyung Kim
2016-02-03 10:21   ` [tip:perf/core] " tip-bot for Namhyung Kim
2016-01-27 15:40 ` [PATCH 02/10] perf hists: Update hists' total period when adding entries Namhyung Kim
2016-02-03 10:21   ` [tip:perf/core] " tip-bot for Namhyung Kim
2016-01-27 15:40 ` [PATCH 03/10] perf report: Apply --percent-limit to callchains also Namhyung Kim
2016-02-01 20:19   ` Arnaldo Carvalho de Melo
2016-02-02 13:05     ` Namhyung Kim
2016-02-02 13:55       ` Arnaldo Carvalho de Melo
2016-02-02 14:15         ` Namhyung Kim
2016-02-02 14:27           ` Arnaldo Carvalho de Melo
2016-02-02 14:35             ` Namhyung Kim
2016-02-02 14:57               ` Arnaldo Carvalho de Melo
2016-02-02 15:03                 ` Namhyung Kim
2016-02-03 10:22   ` [tip:perf/core] " tip-bot for Namhyung Kim
2016-01-27 15:40 ` [PATCH 04/10] perf report: Get rid of hist_entry__callchain_fprintf() Namhyung Kim
2016-02-03 10:22   ` [tip:perf/core] " tip-bot for Namhyung Kim
2016-01-27 15:40 ` [PATCH 05/10] perf tools: Pass parent_samples to __callchain__fprintf_graph() Namhyung Kim
2016-02-03 10:22   ` [tip:perf/core] perf callchain: " tip-bot for Namhyung Kim
2016-01-27 15:40 ` [PATCH 06/10] perf report: Fix percent display in callchains on --stdio Namhyung Kim
2016-02-03 10:22   ` [tip:perf/core] " tip-bot for Namhyung Kim
2016-01-27 15:40 ` [PATCH 07/10] perf hists browser: Fix dump to show correct callchain style Namhyung Kim
2016-02-03 10:23   ` [tip:perf/core] " tip-bot for Namhyung Kim
2016-01-27 15:40 ` [PATCH 08/10] perf hists browser: Pass parent_total to callchain print functions Namhyung Kim
2016-02-03 10:23   ` [tip:perf/core] " tip-bot for Namhyung Kim
2016-01-27 15:40 ` [PATCH 09/10] perf hists browser: Fix percent display in callchains Namhyung Kim
2016-02-03 10:24   ` [tip:perf/core] " tip-bot for Namhyung Kim
2016-01-27 15:40 ` [RFC/PATCH 10/10] perf tools: Change default calchain percent limit to 0.005% Namhyung Kim
2016-01-27 16:06   ` Andi Kleen
2016-01-27 23:34     ` Namhyung Kim [this message]
2016-01-28  8:14 ` [PATCHSET 00/10] perf tools: Apply percent-limit to callchains (v2) Jiri Olsa
2016-01-28  8:42   ` Namhyung Kim
2016-01-28  8:16 ` Jiri Olsa
2016-01-28 10:14   ` Namhyung Kim
2016-01-28 10:16     ` Namhyung Kim
2016-01-28 12:12       ` Jiri Olsa
2016-01-28 12:24         ` Namhyung Kim
2016-01-28 19:52           ` Jiri Olsa
2016-01-29 21:00             ` Arnaldo Carvalho de Melo
2016-01-30 13:52               ` Namhyung Kim
2016-02-03 10:24           ` [tip:perf/core] perf report: Don' t show blank lines if entry has no callchain tip-bot for Namhyung Kim

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