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

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Message-ID: <20250422174102.GC1853@cmpxchg.org>
Date: Tue, 22 Apr 2025 13:41:02 -0400
From: Johannes Weiner <hannes@...xchg.org>
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, mhocko@...nel.org, roman.gushchin@...ux.dev,
	shakeel.butt@...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 09:26:15PM -0400, Gregory Price 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>

With the rcu lock removal from the follow-up fixlet,

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