linux-kernel - Re: [PATCH 1/3] perf sort: Add 'addr' sort key

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Date:	Wed, 27 Mar 2013 17:59:17 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] perf sort: Add 'addr' sort key

Em Wed, Mar 27, 2013 at 03:12:34PM +0900, Namhyung Kim escreveu:
> On Tue, 26 Mar 2013 15:40:23 +0100, Ingo Molnar wrote:
> > * Namhyung Kim <namhyung@...nel.org> wrote:
> >> 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

Will Cohen asked if this was possible while trying to figure out why
some libxul.so samples were not being resolved to symbols, Will?

Namhyung, I'm using:

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

Just before the: Link: entry, consider adding it when addressing some
bugzilla entry, be it from bugzilla.kernel.org or from some other
bugzilla where problems or feature requests were made.

- Arnaldo
 
> >
> > 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?

See above.
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