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Date:   Tue, 22 Sep 2020 12:01:52 +0200
From:   Michal Hocko <>
To:     Yafang Shao <>
Cc:, Johannes Weiner <>,
        Vladimir Davydov <>,
        Andrew Morton <>,
        Tejun Heo <>,,
        Jonathan Corbet <>,
        Alexei Starovoitov <>,
        Daniel Borkmann <>,,
        Song Liu <>, Yonghong Song <>,,,,
        Cgroups <>,,
        Linux MM <>,
        LKML <>,
        netdev <>,
Subject: Re: [PATCH] mm/memcontrol: Add the drop_cache interface for cgroup v2

On Tue 22-09-20 16:06:31, Yafang Shao wrote:
> On Tue, Sep 22, 2020 at 3:27 PM Michal Hocko <> wrote:
> > What is the latency triggered by the memory reclaim? It should be mostly
> > a clean page cache right as drop_caches only drops clean pages. Or is
> > this more about [id]cache? Do you have any profiles where is the time
> > spent?
> >
> Yes, we have analyzed the issues in the direct reclaim, but that is
> not the point.

Are those fixed?

> The point is that each case may take us several days to analyze, while
> the user can't wait, so they will use drop_caches to workaround it
> until we find the solution.

As I've said there are several options to achieve an immediate action.
Careful resource domains configuration will certainly help with that.
Michal Hocko

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