linux-kernel - Re: [PATCH v0 04/71] itrace: Infrastructure for instruction flow tracing units

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Message-ID: <20140107154255.GB20765@two.firstfloor.org>
Date:	Tue, 7 Jan 2014 16:42:55 +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

> 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?

Or do you mean interaction with the LBRs here?
(currently LBRs and PT are mutually exclusive)

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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