linux-kernel - Re: [RFC PATCH v4 0/3] memcg weighted interleave mempolicy control

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Message-ID: <ZUyuL9_8PPiEflnS@tiehlicka>
Date:   Thu, 9 Nov 2023 11:02:23 +0100
From:   Michal Hocko <mhocko@...e.com>
To:     Gregory Price <gourry.memverge@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-cxl@...r.kernel.org,
        linux-mm@...ck.org, cgroups@...r.kernel.org,
        linux-doc@...r.kernel.org, ying.huang@...el.com,
        akpm@...ux-foundation.org, tj@...nel.org, lizefan.x@...edance.com,
        hannes@...xchg.org, corbet@....net, roman.gushchin@...ux.dev,
        shakeelb@...gle.com, muchun.song@...ux.dev,
        Gregory Price <gregory.price@...verge.com>
Subject: Re: [RFC PATCH v4 0/3] memcg weighted interleave mempolicy control

On Wed 08-11-23 19:25:14, Gregory Price wrote:
> This patchset implements weighted interleave and adds a new cgroup
> sysfs entry: cgroup/memory.interleave_weights (excluded from root).

Why have you chosen memory controler rather than cpuset controller?
TBH I do not think memcg is the best fit because traditionally memcg
accounts consumption rather than memory placement. This means that the
memory is already allocated when it is charged for a memcg. On the other
hand cpuset controller is the one to control the allocation placement so
it would seem a better fit.
-- 
Michal Hocko
SUSE Labs