Re: [PATCH] mm/slab: fix kmemcg cache creation delayed issue

[Joonsoo Kim]

On Thu, Oct 06, 2016 at 09:02:00AM -0700, Doug Smythies wrote:
> It was my (limited) understanding that the subsequent 2 patch set
> superseded this patch. Indeed, the 2 patch set seems to solve
> both the SLAB and SLUB bug reports.

It would mean that patch 1 solves both the SLAB and SLUB bug reports
since patch 2 is only effective for SLUB.

Reason that I send this patch is that although patch 1 fixes the
issue that too many kworkers are created, kmem_cache creation/destory
is still slowed by synchronize_sched() and it would cause kmemcg
usage counting delayed. I'm not sure how bad it is but it's generally
better to start accounting as soon as possible. With patch 2 for SLUB
and this patch for SLAB, performance of kmem_cache
creation/destory would recover.

Thanks.

> 
> References:
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=172981
> https://bugzilla.kernel.org/show_bug.cgi?id=172991
> https://patchwork.kernel.org/patch/9361853
> https://patchwork.kernel.org/patch/9359271