Re: [PATCH v7 8/8] x86/tlb: just do tlb flush on one of siblings of SMT

[Andrew Lutomirski]

On Wed, May 23, 2012 at 10:15 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> On Wed, 2012-05-23 at 19:09 +0200, Peter Zijlstra wrote:
>> > There is no comment or anything else indicating that this is
>> > suitable for dual-thread CPUs only - when there are more than
>> > 2 threads per core, the intended effect won't be achieved.
>>
>> Why would that be? Won't higher thread count still share the same
>> resources just more so?
>
> Ah, I see, you're saying his code is buggy for >2 threads. Agreed.
>

An evil knob to statically choose which SMT sibling gets the interrupt
would be nice.  Then my compute-intensive thread could be (mostly)
unaffected by the other thread on a different core that calls munmap
frequently.

--Andy
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