linux-kernel - Re: [PATCH -v3] perf, x86: try to handle unknown nmis with running perfctrs

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Date:	Thu, 26 Aug 2010 22:02:50 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Don Zickus <dzickus@...hat.com>
Cc:	Robert Richter <robert.richter@....com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Lin Ming <ming.m.lin@...el.com>,
	"fweisbec@...il.com" <fweisbec@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Huang, Ying" <ying.huang@...el.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH -v3] perf, x86: try to handle unknown nmis with running
	perfctrs

On Thu, Aug 26, 2010 at 12:40:31PM -0400, Don Zickus wrote:
> On Thu, Aug 26, 2010 at 07:34:04PM +0400, Cyrill Gorcunov wrote:
> > > I'll keep looking for the race condition to better fix it.
> > > 
> > > Cheers,
> > > Don
> > > 
> > 
> > Sounds promising, mind to post new inter-diff? Ie what you have
> > changed from Robert's patch.
> 
> It was really in Peter's patch, just a stupid hack for now.
> 
> Cheers,
> Don
> 
> 
> diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
> index 4539b4b..9e65a7b 100644
> --- a/arch/x86/kernel/cpu/perf_event_intel.c
> +++ b/arch/x86/kernel/cpu/perf_event_intel.c
> @@ -777,7 +777,9 @@ again:
>  
>  done:
>  	intel_pmu_enable_all(0);
> -	return handled;
> +	if (!handled)
> +		return handled;
> +	return ++handled;
>  }
>  
>  static struct event_constraint *
> 

ok, it seems it just treat any unknown nmi as being came from PMU, no?

	-- Cyrill
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