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

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Date:	Tue, 16 Mar 2010 11:23:13 +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 03/16/2010 10:47 AM, Ingo Molnar wrote:
> > * 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!
> 
> BTW the patch I sent yesterday for tracing 32-bit apps is still needed, 
> since that is a kernel patch, and it wasn't due to using the wrong perf.

I've Cc:-ed Frederic for that bug. (Frederic has written a good deal of that 
code)

> > I suspect we could install into /usr/local too. Do you want to send a patch 
> > for that?
> 
> Sent.
> 
> BTW I think perf would need some documentation on how to install, and what 
> packages you need to build everything, what permissions it needs to run, 
> etc.

Agreed. (I've Cc:-ed Arnaldo who has a pending fix in this area.)

	Ingo
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