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

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Date:	Mon, 16 Nov 2009 21:58:20 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	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


* Arnaldo Carvalho de Melo <acme@...stprotocols.net> wrote:

> 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.

Hm, i'd say that's a (small) bug in Git.

Porcelain can add flags just fine to get 'raw' behavior - so in general 
we want to default the most human friendly parameters to the most 
human-readable output format.

	Ingo
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