linux-kernel - Re: [PATCH 2/3] perf/x86/pebs: add workaround for broken OVFL status on HSW

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Message-ID: <CABPqkBQ3T1hx6Ncmhf_GN3ivw7JyOguXbbrCBpGkN7=qsXbf=Q@mail.gmail.com>
Date:	Tue, 8 Mar 2016 13:13:24 -0800
From:	Stephane Eranian <eranian@...gle.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Jiri Olsa <jolsa@...hat.com>, Andi Kleen <ak@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"Liang, Kan" <kan.liang@...el.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH 2/3] perf/x86/pebs: add workaround for broken OVFL status
 on HSW

Hi,

On Tue, Mar 8, 2016 at 1:07 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Tue, Mar 08, 2016 at 12:59:23PM -0800, Stephane Eranian wrote:
>> hi,
>>
>> On Mon, Mar 7, 2016 at 12:25 PM, Peter Zijlstra <peterz@...radead.org> wrote:
>> >
>> > On Mon, Mar 07, 2016 at 07:27:31PM +0100, Jiri Olsa wrote:
>> > > On Mon, Mar 07, 2016 at 01:18:40PM +0100, Peter Zijlstra wrote:
>> > > > On Mon, Mar 07, 2016 at 11:24:13AM +0100, Peter Zijlstra wrote:
>> > > >
>> > > > > I suspect Andi is having something along:
>> > > > >
>> > > > >  lkml.kernel.org/r/1445458568-16956-1-git-send-email-andi@...stfloor.org
>> > > > >
>> > > > > applied to his tree.
>> > > >
>> > > > OK, I munged a bunch of patches together, please have a hard look at the
>> > > > end result found in:
>> > > >
>> > > >   git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git perf/core
>> > > >
>>
>> I ran this kernel on Haswell. Even with Andi's fixes the problem I identified is
>> still there, so my patch is still needed.
>
> Right, your patch should be included in that kernel, or did I make a
> royal mess of things?
>
No, it is as expected for the OVF PMI fix.

> I put Andi's late status ack on top of your patch.
>
> Also note, Ingo merged most of those patches today, all except the top
> 3, because Andi wanted to double check something.

Ok. I will try on SKL today.