linux-kernel - Re: [PATCH] perf tools: Fix build-id matching on vmlinux

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Date:	Thu, 4 Sep 2014 22:13:11 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Stephane Eranian <eranian@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jiri Olsa <jolsa@...hat.com>, David Ahern <dsahern@...il.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Andi Kleen <andi@...stfloor.org>, stable@...r.kernel.org
Subject: Re: [PATCH] perf tools: Fix build-id matching on vmlinux

Em Fri, Sep 05, 2014 at 09:23:56AM +0900, Namhyung Kim escreveu:
> Hmm.. now I'm curious that why the -H option is needed at all.. the perf
> record already wrote build-ids that are actually hits..

Probably because when 'perf buildid-list' was introduced 'perf record'
was inserting all the PERF_RECORD_MMAP dsos into the buildid-list, not
just the ones with hits.

Then, later on, 'perf record' probably moved to register just the ones
with hits.

This way -H ends up being a nop, i.e. should produce the same result as
'perf buildid-list' with no options.

If it doesn't, then it is a bug.

- Arnaldo
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