linux-kernel - Re: [PATCH 1/3] perf, x86: Blacklist all MEM_*

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Message-ID: <20130516160721.GP4072@tassilo.jf.intel.com>
Date:	Thu, 16 May 2013 09:07:21 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] perf, x86: Blacklist all MEM_*_RETIRED events for IVB

> The difficulty is that we cannot use the shared_regs infrastructure because
> the constraint is quite different. Here we need to say that if a mem event
> uses cnt0 on one thread, then nothing can be using cnt0 on the other thread.
> The current shared_regs infrastructure does not work on the counter level.
> So we need to invent something else. It cannot even be extended.

Just need a extra reg per counter, that is only triggered with that event.

-Andi
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