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

[Peter Zijlstra]

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@xxxxxxxxxxxxxx
> > 
> > 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.