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Date: Wed, 23 Sep 2020 10:35:29 +0800 From: Chunxin Zang <zangchunxin@...edance.com> To: Chris Down <chris@...isdown.name> Cc: Michal Hocko <mhocko@...e.com>, Yafang Shao <laoar.shao@...il.com>, Johannes Weiner <hannes@...xchg.org>, Vladimir Davydov <vdavydov.dev@...il.com>, Andrew Morton <akpm@...ux-foundation.org>, Tejun Heo <tj@...nel.org>, lizefan@...wei.com, Jonathan Corbet <corbet@....net>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, kafai@...com, Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>, andriin@...com, john.fastabend@...il.com, kpsingh@...omium.org, Cgroups <cgroups@...r.kernel.org>, linux-doc@...r.kernel.org, Linux MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>, netdev <netdev@...r.kernel.org>, bpf@...r.kernel.org Subject: Re: [External] Re: [PATCH] mm/memcontrol: Add the drop_cache interface for cgroup v2 On Tue, Sep 22, 2020 at 8:43 PM Chris Down <chris@...isdown.name> wrote: > > Chunxin Zang writes: > >Please forgive me for not being able to understand why setting > >memory.low for Type_A can solve the problem. > >In my scene, Type_A is the most important, so I will set 100G to memory.low. > >But 'memory.low' only takes effect passively when the kernel is > >reclaiming memory. It means that reclaim Type_B's memory only when > >Type_A in alloc memory slow path. This will affect Type_A's > >performance. > >We want to reclaim Type_B's memory in advance when A is expected to be busy. > > That's what kswapd reclaim is for, so this distinction is meaningless without > measurements :-) Thanks for these suggestions, I will give it a try. Best wishes Chunxin
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