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

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Date:	Thu, 16 May 2013 18:26:27 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Andi Kleen <ak@...ux.intel.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

On Thu, May 16, 2013 at 6:07 PM, Andi Kleen <ak@...ux.intel.com> wrote:
>> 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.
>
Yes, it would be per counter and not per-event. But the check has to happen
after the assignment and each time we release the counter.

> -Andi
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