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Date: Wed, 8 Jan 2014 00:34:50 +0100
From: Andi Kleen <andi@firstfloor.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Andi Kleen <andi@firstfloor.org>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
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Subject: Re: [PATCH v0 04/71] itrace: Infrastructure for instruction flow
 tracing units
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On Tue, Jan 07, 2014 at 09:51:45PM +0100, Peter Zijlstra wrote:
> On Tue, Jan 07, 2014 at 04:42:55PM +0100, Andi Kleen wrote:
> > > Yes; go read this:
> > > 
> > >  lkml.kernel.org/r/20131219125205.GT3694@twins.programming.kicks-ass.net
> > 
> > Hmm, but AFAIK we're not using freeze counters on PMI today.
> > We just rely on the explicit disabling in the counters through the global
> > ctrl.
> > 
> > So it should be the same as with any other PMI which also does not
> > automatically freeze. Not true?
> 
> Regardless whether its used or not; I'd very much like that answered.

The freeze always starts with the counter overflow, independent if the interrupt
is blocked or not. So everything should be ok.

-Andi