Re: [PATCH 0/7] slub: Fastpath optimization (especially for RT) V1

[Christoph Lameter]

On Wed, 17 Dec 2014, Joonsoo Kim wrote:

> Ping... and I found another way to remove preempt_disable/enable
> without complex changes.
>
> What we want to ensure is getting tid and kmem_cache_cpu
> on the same cpu. We can achieve that goal with below condition loop.
>
> I ran Jesper's benchmark and saw 3~5% win in a fast-path loop over
> kmem_cache_alloc+free in CONFIG_PREEMPT.
>
> 14.5 ns -> 13.8 ns
>
> See following patch.

Good idea. How does this affect the !CONFIG_PREEMPT case?
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