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

From	Stephane Eranian <eranian@google.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH 2/3] perf/x86/pebs: add workaround for broken OVFL status on HSW
Date	2016-03-10 17:20 +0100
Message-ID	<rbbtD-16X-9@gated-at.bofh.it> (permalink)
References	(2 earlier) <r8Ji9-4Qn-1@gated-at.bofh.it> <r8Lah-6iy-1@gated-at.bofh.it> <ra0Ah-1AN-1@gated-at.bofh.it> <ra2iK-2IY-19@gated-at.bofh.it> <rb9i9-7Ja-7@gated-at.bofh.it>
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On Thu, Mar 10, 2016 at 5:53 AM, Peter Zijlstra <peterz@infradead.org> 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@firstfloor.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
>
> So while running tip/master I just triggered the "irq loop stuck" warn
> on my IVB, with status==1, and PMC0 didn't look weird at all.
>
> I've not seen that for a fair while. But it does show it still happens
> on not quite antique hardware.

Yes, as I said, tip.git is missing something, with Andi's missing 3
patches I do not get
that. But with them, I was getting the problem I described earlier, so
I just posted a
patch to handle that particular case where bit 62 is not set, yet PEBS
counters show
overflow. Test it.

Thanks.

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Re: [PATCH 2/3] perf/x86/pebs: add workaround for broken OVFL status  on HSW Peter Zijlstra <peterz@infradead.org> - 2016-03-07 11:30 +0100
  Re: [PATCH 2/3] perf/x86/pebs: add workaround for broken OVFL status  on HSW Peter Zijlstra <peterz@infradead.org> - 2016-03-07 13:20 +0100
    Re: [PATCH 2/3] perf/x86/pebs: add workaround for broken OVFL status  on HSW Jiri Olsa <jolsa@redhat.com> - 2016-03-07 19:30 +0100
      Re: [PATCH 2/3] perf/x86/pebs: add workaround for broken OVFL status  on HSW Peter Zijlstra <peterz@infradead.org> - 2016-03-07 21:30 +0100
        Re: [PATCH 2/3] perf/x86/pebs: add workaround for broken OVFL status  on HSW Stephane Eranian <eranian@google.com> - 2016-03-08 22:10 +0100
          Re: [PATCH 2/3] perf/x86/pebs: add workaround for broken OVFL status  on HSW Peter Zijlstra <peterz@infradead.org> - 2016-03-08 22:10 +0100
            Re: [PATCH 2/3] perf/x86/pebs: add workaround for broken OVFL status  on HSW Stephane Eranian <eranian@google.com> - 2016-03-08 22:20 +0100
              Re: [PATCH 2/3] perf/x86/pebs: add workaround for broken OVFL status  on HSW Stephane Eranian <eranian@google.com> - 2016-03-09 06:40 +0100
                Re: [PATCH 2/3] perf/x86/pebs: add workaround for broken OVFL status  on HSW Stephane Eranian <eranian@google.com> - 2016-03-09 06:50 +0100
                Re: [PATCH 2/3] perf/x86/pebs: add workaround for broken OVFL status  on HSW Stephane Eranian <eranian@google.com> - 2016-03-09 18:50 +0100
                Re: [PATCH 2/3] perf/x86/pebs: add workaround for broken OVFL status  on HSW Peter Zijlstra <peterz@infradead.org> - 2016-03-10 11:50 +0100
    Re: [PATCH 2/3] perf/x86/pebs: add workaround for broken OVFL status  on HSW Peter Zijlstra <peterz@infradead.org> - 2016-03-10 15:00 +0100
      Re: [PATCH 2/3] perf/x86/pebs: add workaround for broken OVFL status  on HSW Stephane Eranian <eranian@google.com> - 2016-03-10 17:20 +0100

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