linux-kernel - Re: [PATCH 4/4] mm: shrinker: make shrinker not depend on memcg kmem

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Date:   Wed, 12 Jun 2019 05:52:57 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Yang Shi <yang.shi@...ux.alibaba.com>
Cc:     ktkhai@...tuozzo.com, kirill.shutemov@...ux.intel.com,
        hannes@...xchg.org, mhocko@...e.com, hughd@...gle.com,
        shakeelb@...gle.com, rientjes@...gle.com,
        akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] mm: shrinker: make shrinker not depend on memcg kmem

On Fri, Jun 07, 2019 at 02:07:39PM +0800, Yang Shi wrote:
> Currently shrinker is just allocated and can work when memcg kmem is
> enabled.  But, THP deferred split shrinker is not slab shrinker, it
> doesn't make too much sense to have such shrinker depend on memcg kmem.
> It should be able to reclaim THP even though memcg kmem is disabled.
> 
> Introduce a new shrinker flag, SHRINKER_NONSLAB, for non-slab shrinker,
> i.e. THP deferred split shrinker.  When memcg kmem is disabled, just
> such shrinkers can be called in shrinking memcg slab.

Looks like it breaks bisectability. It has to be done before makeing
shrinker memcg-aware, hasn't it?

-- 
 Kirill A. Shutemov