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From: Namhyung Kim <namhyung@kernel.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Paul Mackerras <paulus@samba.org>,
	Namhyung Kim <namhyung.kim@lge.com>,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/3] perf sort: Add 'addr' sort key
Date: Wed, 27 Mar 2013 15:12:34 +0900	[thread overview]
Message-ID: <87ehf1gylp.fsf@sejong.aot.lge.com> (raw)
In-Reply-To: <20130326144023.GA1621@gmail.com> (Ingo Molnar's message of "Tue, 26 Mar 2013 15:40:23 +0100")

Hi Ingo,

On Tue, 26 Mar 2013 15:40:23 +0100, Ingo Molnar wrote:
> * Namhyung Kim <namhyung@kernel.org> wrote:
>
>> From: Namhyung Kim <namhyung.kim@lge.com>
>> 
>> New addr sort key provides a way to sort the entries by the symbol
>> addresses.
>
> No objections from me - just wondering about the motivation: why would we 
> want to sort by symbol address?

In fact, it came from bugzilla:

  https://bugzilla.kernel.org/show_bug.cgi?id=55561

>
> Perhaps to see the overhead layout/distribution within a DSO, to better 
> cache-pack hot functions by placing them next to each other?
>
> Putting a short usecase into the changelog (or even better, the 
> documentation) would be nice.

Well, I didn't thought it much, but yeah, aforementioned usecase looks
promising.  Also it might be useful to find out which part is the
hotpath in a function if you have some really big functions (possibly
due to auto-inlining or something).

Arnaldo, do you have other usecase/scenario in mind?

Thanks,
Namhyung

  reply	other threads:[~2013-03-27  6:12 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-03-26 12:11 [PATCH 1/3] perf sort: Add 'addr' sort key Namhyung Kim
2013-03-26 12:11 ` [PATCH 2/3] perf sort: Add 'addr_to/from' " Namhyung Kim
2013-03-26 12:11 ` [PATCH 3/3] perf report: Fix alignment of symbol column when -v is given Namhyung Kim
2013-03-26 14:40 ` [PATCH 1/3] perf sort: Add 'addr' sort key Ingo Molnar
2013-03-27  6:12   ` Namhyung Kim [this message]
2013-03-27 20:59     ` Arnaldo Carvalho de Melo

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