linux-kernel - Using build-ids in perf tools was Re: [PATCH -tip perf/probes 00/10] x86 insn decoder bugfixes

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Message-ID: <20091103123518.GA3009@ghostprotocols.net>
Date:	Tue, 3 Nov 2009 10:35:18 -0200
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Roland McGrath <roland@...hat.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Jim Keniston <jkenisto@...ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Jason Baron <jbaron@...hat.com>,
	"K.Prasad" <prasad@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>
Subject: Using build-ids in perf tools was Re: [PATCH -tip perf/probes
	00/10] x86 insn decoder bugfixes

Em Tue, Nov 03, 2009 at 08:24:39AM +0100, Ingo Molnar escreveu:
> * Roland McGrath <roland@...hat.com> wrote:
> > As Frank mentioned, the kernel's and modules' allocated ELF notes (and 
> > thus build IDs) are already exposed in /sys.  Tools like "eu-unstrip 
> > -nk" use this information today.
> 
> Ah, i didnt realize we link with --build-id already, unconditonally, 
> since v2.6.23 (if ld supports it):
> 
>  | From 18991197b4b588255ccabf472ebc84db7b66a19c Mon Sep 17 00:00:00 2001
>  | Subject: [PATCH] Use --build-id ld option
> 
> So we have an SHA1 build-id already on the vmlinux and on modules, and 
> it's exposed in /sys/*/*/notes. Just have to make use of it in 
> tools/perf too.

I wasn't aware this was done upstream, ass-umed that it was only on
kernel specfiles, will cook up a patch for consideration.

- Arnaldo
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