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

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Message-ID: <20091116210402.GA28963@ghostprotocols.net>
Date:	Mon, 16 Nov 2009 19:04:02 -0200
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Ingo Molnar <mingo@...e.hu>
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

Em Mon, Nov 16, 2009 at 09:58:20PM +0100, Ingo Molnar escreveu:
> 
> * 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.

Well, no strong feelings here, make it the other way around and the most
usual case will just ignore those extra characters :-)

- Arnaldo
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