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

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Message-ID: <CAM9d7cgKrcAh0RkpU_3C_UAeO5=RU5UAwCJa8kMyV7aGcoGVRw@mail.gmail.com>
Date:	Fri, 5 Sep 2014 11:30:01 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	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>,
	Stephane Eranian <eranian@...gle.com>, stable@...r.kernel.org
Subject: Re: [PATCH] perf tools: Fix build-id matching on vmlinux

On Fri, Sep 5, 2014 at 10:42 AM, Namhyung Kim <namhyung@...nel.org> wrote:
> On Fri, Sep 5, 2014 at 10:18 AM, Arnaldo Carvalho de Melo
> <acme@...nel.org> wrote:
>> Em Fri, Sep 05, 2014 at 09:09:49AM +0900, Namhyung Kim escreveu:
>>> The perf report rebuilds machine states from the event records only.  In
>>> this case, the kernel map was recorded in the name of [kernel.kallsyms]
>>> so it couldn't find the build-id from the table.
>>
>> Ok, but then we can special case this one, no?
>>
>> Somehow mark in the buildid table that that entry is the one for the
>> kernel and hook it up to the synthesized event that has the
>> [kernel.kallsyms].ref_reloc_sym entry.
>
> Maybe we can search vmlinux in machine->kernel_dsos first when
> processing kernel mmap event.  And in this case do you want replace
> the name of mapping to a fullname of vmlinux?

Ah.. the name of mapping is not used at all after finding a matching
dso.  Ok then, I'll post a new patch to search vmlinux before
kallsyms.

Thanks
Namhyung
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