linux-kernel - Re: [PATCH] mm: Move check for SHRINKER_NUMA_AWARE to do_shrink

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Date:   Thu, 2 Aug 2018 10:26:14 -0700
From:   Yang Shi <shy828301@...il.com>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     Kirill Tkhai <ktkhai@...tuozzo.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Michal Hocko <mhocko@...e.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Huang Ying <ying.huang@...el.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Matthew Wilcox <willy@...radead.org>, jbacik@...com,
        Linux MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: Move check for SHRINKER_NUMA_AWARE to do_shrink_slab()

On Thu, Aug 2, 2018 at 9:54 AM, Shakeel Butt <shakeelb@...gle.com> wrote:
> On Thu, Aug 2, 2018 at 9:47 AM Yang Shi <shy828301@...il.com> wrote:
>>
>> On Thu, Aug 2, 2018 at 4:00 AM, Kirill Tkhai <ktkhai@...tuozzo.com> wrote:
>> > In case of shrink_slab_memcg() we do not zero nid, when shrinker
>> > is not numa-aware. This is not a real problem, since currently
>> > all memcg-aware shrinkers are numa-aware too (we have two:
>>
>> Actually, this is not true. huge_zero_page_shrinker is NOT numa-aware.
>> deferred_split_shrinker is numa-aware.
>>
>
> But both huge_zero_page_shrinker and huge_zero_page_shrinker are not
> memcg-aware shrinkers. I think Kirill is saying all memcg-aware
> shrinkers are also numa-aware shrinkers.

Aha, thanks for reminding. Yes, I missed that memcg-aware part.

>
> Shakeel