Re: [PATCH 33/37] perf bench futex: Cache align the worker struct

[Davidlohr Bueso]

On 2016-10-24 09:20, Arnaldo Carvalho de Melo wrote:
> From: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
>
> It popped up in perf testing that the worker consumes some amount of
> CPU. It boils down to the increment of `ops` which causes cache line
> bouncing between the individual threads.
>
> This patch aligns the struct by 256 bytes to ensure that not a cache
> line is shared among CPUs. 128 byte is the x86 worst case and grep says
> that L1_CACHE_SHIFT is set to 8 on s390.

Hmm so this one should have been replaced with this:

https://marc.info/?l=linux-kernel&m=147690008801082

Thanks,
Davidlohr