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

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Message-ID: <4B9F3EEC.7050104@gmail.com>
Date:	Tue, 16 Mar 2010 10:18:52 +0200
From:	Török Edwin <edwintorok@...il.com>
To:	Ingo Molnar <mingo@...hat.com>
CC:	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
Subject: Re: fix callgraphs of 32-bit processes on 64-bit kernels.

On 03/15/2010 06:23 PM, Török Edwin wrote:
> On 03/15/2010 05:34 PM, Török 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
               |          radeon_cs_ioctl
               |          drm_ioctl
               |          radeon_kms_compat_ioctl
               |          compat_sys_ioctl
               |          sysenter_dispatch
               |          0xf7759430
               |          drmCommandWriteRead
               |          cs_gem_emit
               |          radeon_cs_emit
               |          rcommonFlushCmdBufLocked
               |          rcommonFlushCmdBuf
               |          radeonFlush
               |          _mesa_flush
               |          _mesa_Flush
               |          0xf76ee270
               |          0x804a6d5
               |          __libc_start_main
               |          0x8049111
[...]

Best regards,
--Edwin
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