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Message-ID: <20140107233450.GG20765@two.firstfloor.org>
Date: Wed, 8 Jan 2014 00:34:50 +0100
From: Andi Kleen <andi@...stfloor.org>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Andi Kleen <andi@...stfloor.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Ingo Molnar <mingo@...nel.org>,
Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
David Ahern <dsahern@...il.com>,
Frederic Weisbecker <fweisbec@...il.com>,
Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
Namhyung Kim <namhyung@...il.com>,
Paul Mackerras <paulus@...ba.org>,
Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v0 04/71] itrace: Infrastructure for instruction flow
tracing units
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@...ns.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
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