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

[Alex Shi]

On 05/24/2012 09:46 AM, Andrew Lutomirski wrote:

> 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.


How to know we are in such situation? :)

> 
> --Andy


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