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Date:   Wed, 2 Jan 2019 13:45:49 -0800
From:   Shakeel Butt <>
To:     Yang Shi <>
Cc:     Michal Hocko <>,
        Johannes Weiner <>,
        Andrew Morton <>,
        Linux MM <>,
        LKML <>
Subject: Re: [PATCH 2/3] mm: memcontrol: do not try to do swap when force empty

On Wed, Jan 2, 2019 at 12:06 PM Yang Shi <> wrote:
> The typical usecase of force empty is to try to reclaim as much as
> possible memory before offlining a memcg.  Since there should be no
> attached tasks to offlining memcg, the tasks anonymous pages would have
> already been freed or uncharged.

Anon pages can come from tmpfs files as well.

> Even though anonymous pages get
> swapped out, but they still get charged to swap space.  So, it sounds
> pointless to do swap for force empty.

I understand that force_empty is typically used before rmdir'ing a
memcg but it might be used differently by some users. We use this
interface to test memory reclaim behavior (anon and file).

Anyways, I am not against changing the behavior, we can adapt
internally but there might be other users using this interface


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