linux-kernel - Re: [PATCH v4 3/3] mm: memcg/slab: Disable cache merging for KMALLOC

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Date:   Wed, 5 May 2021 13:39:23 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Waiman Long <longman@...hat.com>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Vlastimil Babka <vbabka@...e.cz>, Roman Gushchin <guro@...com>,
        LKML <linux-kernel@...r.kernel.org>,
        Cgroups <cgroups@...r.kernel.org>, Linux MM <linux-mm@...ck.org>
Subject: Re: [PATCH v4 3/3] mm: memcg/slab: Disable cache merging for
 KMALLOC_NORMAL caches

On Wed, May 5, 2021 at 1:06 PM Waiman Long <longman@...hat.com> wrote:
>
> The KMALLOC_NORMAL (kmalloc-<n>) caches are for unaccounted objects only
> when CONFIG_MEMCG_KMEM is enabled. To make sure that this condition
> remains true, we will have to prevent KMALOC_NORMAL caches to merge
> with other kmem caches. This is now done by setting its refcount to -1
> right after its creation.
>
> Suggested-by: Roman Gushchin <guro@...com>
> Signed-off-by: Waiman Long <longman@...hat.com>

Reviewed-by: Shakeel Butt <shakeelb@...gle.com>