linux-kernel - Re: [PATCH] oprofile, powerpc: Handle events that raise an exception without overflowing

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Message-ID: <20110524092747.GS20052@erda.amd.com>
Date:	Tue, 24 May 2011 11:27:47 +0200
From:	Robert Richter <robert.richter@....com>
To:	Eric B Munson <emunson@...bm.net>
CC:	"benh@...nel.crashing.org" <benh@...nel.crashing.org>,
	"paulus@...ba.org" <paulus@...ba.org>,
	"oprofile-list@...ts.sf.net" <oprofile-list@...ts.sf.net>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] oprofile, powerpc: Handle events that raise an exception
 without overflowing

On 23.05.11 10:22:40, Eric B Munson wrote:
> Commit 0837e3242c73566fc1c0196b4ec61779c25ffc93 fixes a situation on POWER7
> where events can roll back if a specualtive event doesn't actually complete.
> This can raise a performance monitor exception.  We need to catch this to ensure
> that we reset the PMC.  In all cases the PMC will be less than 256 cycles from
> overflow.
> 
> This patch lifts Anton's fix for the problem in perf and applies it to oprofile
> as well.
> 
> Signed-off-by: Eric B Munson <emunson@...bm.net>
> Cc: <stable@...nel.org> # as far back as it applies cleanly
> ---
>  arch/powerpc/oprofile/op_model_power4.c |   24 +++++++++++++++++++++++-
>  1 files changed, 23 insertions(+), 1 deletions(-)

I applied the fix to oprofile/urgent.

Thanks Eric,

-Robert

-- 
Advanced Micro Devices, Inc.
Operating System Research Center

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