linux-kernel - Re: fix callgraphs of 32-bit processes on 64-bit kernels.

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Message-ID: <20100316084714.GB7961@elte.hu>
Date:	Tue, 16 Mar 2010 09:47:14 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	T??r??k Edwin <edwintorok@...il.com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	Fr??d??ric Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: fix callgraphs of 32-bit processes on 64-bit kernels.


* T??r??k Edwin <edwintorok@...il.com> wrote:

> On 03/15/2010 06:23 PM, T??r??k Edwin wrote:
> > On 03/15/2010 05:34 PM, T??r??k Edwin wrote:
> >>
> >> It would be good if perf knew how to lookup symbols in kernel modules!
> > 
> > BTW perf report -m -k /home/edwin/builds/linux-2.6/vmlinux doesn't show
> > the symbols either.
> 
> I always forget that, unlike every other program, perf doesn't install
> by default to /usr/local!
> So I was running the wrong version of perf (from an older kernel), since
> perf was installed to $HOME/bin (which of course isn't in sudo's path).
> 
> Sorry for the confusion, the 2.6.33 perf DOES know how to lookup the
> symbols:
>     9.92%  glxgears  [radeon]                           [k]
> r600_packet3_check
>             |
>             --- r600_packet3_check
>                |
>                |--96.80%-- r600_cs_parse

Ok, great!

I suspect we could install into /usr/local too. Do you want to send a patch 
for that?

	Ingo
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