Re: [PATCH v2 0/12] perf/x86: implement HT leak workaround for SNB/IVB/HSW

[Stephane Eranian]

Peter,

On Tue, Oct 21, 2014 at 1:25 PM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
>
>
> lkml.kernel.org/r/CABPqkBRbst4sgpgE5O_VXt-CSC0VD=aP2KWA0e3Uy64tw7df3A@xxxxxxxxxxxxxx
>
> I missed that 3 lines if they were in here.
>
I did not put them in there because there is another problem.
If you partition the generic counters 2 and 2, then some CPUs will not
be able to measure some events.
Unfortunately, there is no way to partition the 4 counters such that
all the events can be measured by
each CPU. Some events or precise sampling requires counter 2 for
instance (like prec_dist).
That's why I did not put this fix in.
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