Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1421661 > unrolled thread

Re: [PATCH RFC] slub: reap free slabs periodically

Back to article view | Back to linux.kernel

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

Contents

  Re: [PATCH RFC] slub: reap free slabs periodically Vladimir Davydov <vdavydov@virtuozzo.com> - 2016-06-14 10:30 +0200

#1421661 — Re: [PATCH RFC] slub: reap free slabs periodically

On Fri, Jun 10, 2016 at 04:32:26PM -0500, Christoph Lameter wrote:
> One reason for SLUBs creation was the 2 second scans in  SLAB which causes
> significant disruption of latency sensitive tasksk.

That's not good, indeed.

> 
> You can simply implement a reaper in userspace by running
> 
> slabinfo -s
> 
> if you have to have this.

Doing this periodically would probably hurt performance of active caches
as 'slabinfo -s' shrinks all slabs unconditionally, even if they are
being actively used. OTOH, one could trigger shrinking slabs only on
memory pressure. That would require yet another daemon tracking the
system state, but it is doable I guess.

Thanks a lot for your input, Christoph.

> 
> There is no need to duplicate SLAB problems.

[toc] | [standalone]

Back to top | Article view | linux.kernel

csiph-web