linux-kernel - Re: [tip:perf/urgent] perf, x86: Catch spurious interrupts after disabling counters

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Message-ID: <20100929162249.GM13563@erda.amd.com>
Date:	Wed, 29 Sep 2010 18:22:49 +0200
From:	Robert Richter <robert.richter@....com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
CC:	Stephane Eranian <eranian@...gle.com>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"yinghai@...nel.org" <yinghai@...nel.org>,
	"andi@...stfloor.org" <andi@...stfloor.org>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"ying.huang@...el.com" <ying.huang@...el.com>,
	"fweisbec@...il.com" <fweisbec@...il.com>,
	"ming.m.lin@...el.com" <ming.m.lin@...el.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"dzickus@...hat.com" <dzickus@...hat.com>,
	"mingo@...e.hu" <mingo@...e.hu>
Subject: Re: [tip:perf/urgent] perf, x86: Catch spurious interrupts after
 disabling counters

On 29.09.10 11:27:45, Cyrill Gorcunov wrote:
> On Wed, Sep 29, 2010 at 05:12:53PM +0200, Robert Richter wrote:
> > On 29.09.10 17:01:40, Robert Richter wrote:
> > > Right, I wasn't remembering correctly, it was P6 and core. And yes, P4
> > > requires the fix. Will send a patch for this.
> > 
> > Ok, Cyrill is sending the patch.
> > 
> > Thanks,
> > 
> > -Robert
> >
> 
> Managed to implement it earlier then I thought.
> 
>   Cyrill
> ---
> Subject: [PATCH -tip] perf, x86: Handle in flight IRQs on P4 platform
> 
> Stephane reported we've missed to guard P4 platform
> against spurious in-flight performance IRQs. Fix it.
> 
> [ the patch is a complement to commit 63e6be6d98e1 ]
> 
> Reported-by: Stephane Eranian <eranian@...gle.com>
> Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>
> CC: Robert Richter <robert.richter@....com>
> CC: Lin Ming <ming.m.lin@...el.com>
> ---
>  arch/x86/kernel/cpu/perf_event_p4.c |    6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)

The fix looks correct to me.

-Robert

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

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