linux-kernel - Re: [tip:perf/urgent] perf/x86: Enable raw event access to Intel offcore events

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Date:	Mon, 21 Nov 2011 22:42:10 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Vince Weaver <vweaver1@...s.utk.edu>, mingo@...hat.com,
	hpa@...or.com, linux-kernel@...r.kernel.org, tglx@...utronix.de,
	mingo@...e.hu
Subject: Re: [tip:perf/urgent] perf/x86: Enable raw event access to Intel
 offcore events

On Mon, 2011-11-21 at 22:39 +0100, Stephane Eranian wrote:
> To solve this problem (in the general case), you need to know which
> counter is taken (or required)
> by ALL pinned system-wide events across all CPUs. Once you've
> constructed the bitmap, you can
> use it as the basis (used_mask) to try and schedule the group events.
> 
Its worse, you also need to consider all task-pinned events if you want
to be complete. That's an even worse problem.
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