linux-kernel - Re: [PATCH] mm, memcg: fix mem_cgroup

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Message-ID: <20171129101713.GA28244@cmpxchg.org>
Date:   Wed, 29 Nov 2017 10:17:13 +0000
From:   Johannes Weiner <hannes@...xchg.org>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     Huang Ying <ying.huang@...el.com>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Michal Hocko <mhocko@...nel.org>,
        Greg Thelen <gthelen@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] mm, memcg: fix mem_cgroup_swapout() for THPs

On Tue, Nov 28, 2017 at 08:19:41AM -0800, Shakeel Butt wrote:
> The commit d6810d730022 ("memcg, THP, swap: make mem_cgroup_swapout()
> support THP") changed mem_cgroup_swapout() to support transparent huge
> page (THP). However the patch missed one location which should be
> changed for correctly handling THPs. The resulting bug will cause the
> memory cgroups whose THPs were swapped out to become zombies on
> deletion.
> 
> Fixes: d6810d730022 ("memcg, THP, swap: make mem_cgroup_swapout() support THP")
> Signed-off-by: Shakeel Butt <shakeelb@...gle.com>
> Cc: stable@...r.kernel.org

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