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

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Message-ID: <ZU6pR46kiuzPricM@slm.duckdns.org>
Date:   Fri, 10 Nov 2023 12:05:59 -1000
From:   "tj@...nel.org" <tj@...nel.org>
To:     John Groves <john@...alactic.com>
Cc:     Gregory Price <gourry.memverge@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-cxl@...r.kernel.org" <linux-cxl@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "ying.huang@...el.com" <ying.huang@...el.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "mhocko@...nel.org" <mhocko@...nel.org>,
        "lizefan.x@...edance.com" <lizefan.x@...edance.com>,
        "hannes@...xchg.org" <hannes@...xchg.org>,
        "corbet@....net" <corbet@....net>,
        "roman.gushchin@...ux.dev" <roman.gushchin@...ux.dev>,
        "shakeelb@...gle.com" <shakeelb@...gle.com>,
        "muchun.song@...ux.dev" <muchun.song@...ux.dev>,
        Gregory Price <gregory.price@...verge.com>,
        "jgroves@...ron.com" <jgroves@...ron.com>
Subject: Re: [RFC PATCH v4 0/3] memcg weighted interleave mempolicy control

Hello,

On Thu, Nov 09, 2023 at 10:48:56PM +0000, John Groves wrote:
> This approach checks all the important boxes: it only applies to apps where
> it's enabled, the weighting can vary from one app to another, the
> kernel is not affected, and the numa topology is not buried.

Can't it be a mempol property which is inherited by child processes? Then
all you'll need is e.g. adding systemd support to configure this at service
unit level. I'm having a bit of hard time seeing why this needs to be a
cgroup feature when it doesn't involve dynamic resource accounting /
enforcement at all.

Thanks.

-- 
tejun