linux-kernel - Re: [PATCH v5 1/7] mm: postpone kmem_cache memcg pointer initialization to memcg_link

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Message-ID: <20190528215637.GA26614@cmpxchg.org>
Date:   Tue, 28 May 2019 17:56:37 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Roman Gushchin <guro@...com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, kernel-team@...com,
        Michal Hocko <mhocko@...nel.org>,
        Rik van Riel <riel@...riel.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Christoph Lameter <cl@...ux.com>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        cgroups@...r.kernel.org, Waiman Long <longman@...hat.com>
Subject: Re: [PATCH v5 1/7] mm: postpone kmem_cache memcg pointer
 initialization to memcg_link_cache()

On Tue, May 21, 2019 at 01:07:29PM -0700, Roman Gushchin wrote:
> Initialize kmem_cache->memcg_params.memcg pointer in
> memcg_link_cache() rather than in init_memcg_params().
> 
> Once kmem_cache will hold a reference to the memory cgroup,
> it will simplify the refcounting.
> 
> For non-root kmem_caches memcg_link_cache() is always called
> before the kmem_cache becomes visible to a user, so it's safe.
> 
> Signed-off-by: Roman Gushchin <guro@...com>
> Reviewed-by: Shakeel Butt <shakeelb@...gle.com>

Acked-by: Johannes Weiner <hannes@...xchg.org>