linux-kernel - Re: [PATCH -next RFC 0/2] cpuset: Add cpuset.mems.spread

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Message-ID: <wpdddawlyxc27fkkkyfwfulq7zjqkxbqqe2upu4irqkcbzptft@jowwnu3yvgvg>
Date: Tue, 30 Sep 2025 14:05:38 +0200
From: Michal Koutný <mkoutny@...e.com>
To: Cai Xinchen <caixinchen1@...wei.com>
Cc: llong@...hat.com, tj@...nel.org, hannes@...xchg.org, 
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org, lujialin4@...wei.com
Subject: Re: [PATCH -next RFC 0/2] cpuset: Add cpuset.mems.spread_page to
 cgroup v2

Hello Xinchen.

On Tue, Sep 30, 2025 at 09:35:50AM +0000, Cai Xinchen <caixinchen1@...wei.com> wrote:
> I discovered that the DataNode process had requested a large amount
> of page cache. most of the page cache was concentrated in one NUMA node,
> ultimately leading to the exhaustion of memory in that NUMA node.
[...]
> This issue can be resolved by migrating the DataNode into
> a cpuset, dropping the cache, and setting cpuset.memory_spread_page to
> allow it to evenly request memory.

Would it work in your case instead to apply memory.max or apply
MPOL_INTERLEAVE to DataNode process?

In anyway, please see commit 012c419f8d248 ("cgroup/cpuset-v1: Add
deprecation messages to memory_spread_page and memory_spread_slab")
since your patchset would need to touch that place(s) too.

Thanks,
Michal

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