linux-kernel - Re: [PATCH] perf: x86: fix callgraphs of 32-bit processes on 64-bit kernels V4.

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Message-ID: <20100330231819.GB5817@nowhere>
Date:	Wed, 31 Mar 2010 01:18:21 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Török Edwin <edwintorok@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf: x86: fix callgraphs of 32-bit processes on
	64-bit kernels V4.

On Wed, Mar 17, 2010 at 12:07:16PM +0200, Török Edwin wrote:
> When profiling a 32-bit process on a 64-bit kernel, callgraph tracing
> stopped after the first function, because it has seen a garbage memory address
> (tried to interpret the frame pointer, and return address as a 64-bit pointer).
> 
> Fix this by using a struct stack_frame with 32-bit pointers when the TIF_IA32 flag is set.
> 
> Note that TIF_IA32 flag must be used, and not is_compat_task(), because the
> latter is only set when the 32-bit process is executing a syscall,
> which may not always be the case (when tracing page fault events for example).
> 
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: x86@...nel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Török Edwin <edwintorok@...il.com>


Queued, thanks!

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