linux-kernel - Re: [PATCH v4 2/2] vmscan,cgroup: apply mems

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Message-ID: <CAGj-7pUvHY74cg=+KLAMYxUWQY5h1A=hhG1-ybS31FA6=UJNmg@mail.gmail.com>
Date: Mon, 21 Apr 2025 21:41:51 -0700
From: Shakeel Butt <shakeel.butt@...ux.dev>
To: Gregory Price <gourry@...rry.net>
Cc: linux-mm@...ck.org, cgroups@...r.kernel.org, linux-kernel@...r.kernel.org, 
	kernel-team@...a.com, longman@...hat.com, hannes@...xchg.org, 
	mhocko@...nel.org, roman.gushchin@...ux.dev, muchun.song@...ux.dev, 
	tj@...nel.org, mkoutny@...e.com, akpm@...ux-foundation.org
Subject: Re: [PATCH v4 2/2] vmscan,cgroup: apply mems_effective to reclaim

On Mon, Apr 21, 2025 at 6:26 PM Gregory Price <gourry@...rry.net> wrote:
>
> It is possible for a reclaimer to cause demotions of an lruvec belonging
> to a cgroup with cpuset.mems set to exclude some nodes. Attempt to apply
> this limitation based on the lruvec's memcg and prevent demotion.
>
> Notably, this may still allow demotion of shared libraries or any memory
> first instantiated in another cgroup. This means cpusets still cannot
> cannot guarantee complete isolation when demotion is enabled, and the
> docs have been updated to reflect this.
>
> This is useful for isolating workloads on a multi-tenant system from
> certain classes of memory more consistently - with the noted exceptions.
>
> Acked-by: Tejun Heo <tj@...nel.org>
> Signed-off-by: Gregory Price <gourry@...rry.net>

Reviewed-by: Shakeel Butt <shakeel.butt@...ux.dev>