linux-kernel - Re: [BUG] perf: bogus correlation of kernel symbols

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Message-ID: <20110512213657.GC17596@elte.hu>
Date:	Thu, 12 May 2011 23:36:57 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] perf: bogus correlation of kernel symbols


* Stephane Eranian <eranian@...gle.com> wrote:

> > The bug is that perf doesn't say "I can't match kernel symbols", but 
> > instead does some crazy matching and gives total crap module information (I 
> > think it just picks the one that shows up last in /proc/kallsyms).
>
> But I agree perf must not silently return bogus information. It should print 
> a big warning message and/or fallback to printing the raw addresses. [...]

Yes, agreed, this is a bug in perf. I found out about this about two weeks ago 
and reported it to Arnaldo, but he is away right now - he might be able to fix 
it next week the earliest.

> [...] So much for having perf in the kernel source tree to keep things in 
> sync...

What do you mean?

Thanks,

	Ingo
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