linux-kernel - Re: [PATCH 5/5] perf buildid-list: New plumbing command

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Date:	Mon, 16 Nov 2009 17:41:04 -0200
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 5/5] perf buildid-list: New plumbing command

Em Mon, Nov 16, 2009 at 07:58:52PM +0100, Frederic Weisbecker escreveu:
> On Mon, Nov 16, 2009 at 04:32:45PM -0200, Arnaldo Carvalho de Melo wrote:
> > With this we can list the buildids in a perf.data file so that we can
> > pipe them to other, distro specific tools that from the buildids can
> > figure out separate packages (foo-debuginfo) where we can find the
> > matching symtabs so that perf report can do its job.
> > E.g:
> > [acme@...pio linux-2.6-tip]$ perf buildid-list | head -2
> > 8e08b117e5458ad3f85da16d42d0fc5cd21c5869
> > 520c2387a587cc5acfcf881e27dba1caaeab4b1f
> > [acme@...pio linux-2.6-tip]$ perf buildid-list -v | head -2
> > 8e08b117e5458ad3f85da16d42d0fc5cd21c5869 /sbin/init
> > 520c2387a587cc5acfcf881e27dba1caaeab4b1f /lib64/ld-2.10.1.so
> 
> I would rather see the effect of this -v option as the default.
> It's very useful to see the dso resolved but hashes alone
> don't pay much.

I disagree, the main purpose of this command is equivalent to 'git
rev-list':

[acme@...pio linux-2.6-tip]$ git rev-list HEAD^^..
089242a8c826aac1c827bb797475b9852fe0db49
18e3a75dc47d8397bbf0936ec8e3ebdecada7ba1
[acme@...pio linux-2.6-tip]$ 

I.e. provide content keys that then will be used by distro specific
porcelain to get the matching -debuginfo packages with the symtabs.

- Arnaldo
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