linux-kernel - Re: [PATCH v6 00/10] mm: reparent slab memory on cgroup removal

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Date:   Wed, 5 Jun 2019 20:45:59 +0000
From:   Roman Gushchin <guro@...com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Kernel Team <Kernel-team@...com>,
        "Johannes Weiner" <hannes@...xchg.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        "Vladimir Davydov" <vdavydov.dev@...il.com>,
        Waiman Long <longman@...hat.com>
Subject: Re: [PATCH v6 00/10] mm: reparent slab memory on cgroup removal

On Tue, Jun 04, 2019 at 09:14:18PM -0700, Andrew Morton wrote:
> On Tue, 4 Jun 2019 19:44:44 -0700 Roman Gushchin <guro@...com> wrote:
> 
> > So instead of trying to find a maybe non-existing balance, let's do reparent
> > the accounted slabs to the parent cgroup on cgroup removal.
>
> s/slabs/slab caches/.  Take more care with the terminology, please...

Slabs are effectively reparented too (what's most important, their
references), but I agree, "slab caches" suits better here.

> 
> > There is a bonus: currently we do release empty kmem_caches on cgroup
> > removal, however all other are waiting for the releasing of the memory cgroup.
> > These refactorings allow kmem_caches to be released as soon as they
> > become inactive and free.
> 
> Unclear.
> 
> s/All other/releasing of all non-empty slab caches depends upon the releasing/
> 
> I think?
> 
How about this?

There is a bonus: currently we release all memcg kmem_caches all together
with the memory cgroup itself. This patchset allows individual kmem_caches
to be released as soon as they become inactive and free.

--

Sorry, my bad, I was focused on patches, and didn't give enough attention
to the cover letter. I hope to get some feedback from Vladimir, and then
post a next version with these issues fixed.

Thank you for looking into it!

Roman