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

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Message-ID: <20160310135343.GL6375@twins.programming.kicks-ass.net>
Date:	Thu, 10 Mar 2016 14:53:43 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	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>, Jiri Olsa <jolsa@...hat.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

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

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.