Re: [PATCH 1/3] perf, x86: Blacklist all MEM_*_RETIRED events for IVB

[Stephane Eranian]

On Thu, May 16, 2013 at 6:07 PM, Andi Kleen <ak@xxxxxxxxxxxxxxx> 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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