linux-kernel - Re: Re: [RFC PATCH net-next] sock: Propose socket.urgent for sockmem isolation

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Message-ID: <8ac1034d-4ddf-86a6-a7dc-769bc5080fac@bytedance.com>
Date:   Tue, 20 Jun 2023 14:39:20 +0800
From:   Abel Wu <wuyun.abel@...edance.com>
To:     Michal Koutný <mkoutny@...e.com>
Cc:     Eric Dumazet <edumazet@...gle.com>, Tejun Heo <tj@...nel.org>,
        Christian Warloe <cwarloe@...gle.com>,
        Wei Wang <weiwan@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Shakeel Butt <shakeelb@...gle.com>,
        Muchun Song <muchun.song@...ux.dev>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Ahern <dsahern@...nel.org>,
        Yosry Ahmed <yosryahmed@...gle.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Yu Zhao <yuzhao@...gle.com>,
        Vasily Averin <vasily.averin@...ux.dev>,
        Kuniyuki Iwashima <kuniyu@...zon.com>,
        Martin KaFai Lau <martin.lau@...nel.org>,
        Xin Long <lucien.xin@...il.com>,
        Jason Xing <kernelxing@...cent.com>,
        Michal Hocko <mhocko@...e.com>,
        Alexei Starovoitov <ast@...nel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
        "open list:CONTROL GROUP - MEMORY RESOURCE CONTROLLER (MEMCG)" 
        <cgroups@...r.kernel.org>,
        "open list:CONTROL GROUP - MEMORY RESOURCE CONTROLLER (MEMCG)" 
        <linux-mm@...ck.org>
Subject: Re: Re: [RFC PATCH net-next] sock: Propose socket.urgent for sockmem
 isolation

Hi Michal,

On 6/20/23 1:30 AM, Michal Koutný wrote:
> On Tue, Jun 13, 2023 at 02:46:32PM +0800, Abel Wu <wuyun.abel@...edance.com> wrote:
>> Memory protection (memory.{min,low}) helps the important jobs less
>> affected by memstalls. But once low priority jobs use lots of kernel
>> memory like sockmem, the protection might become much less efficient.
> 
> What would happen if you applied memory.{min,low} to the important jobs
> and memory.{max,high} to the low prio ones?

I might expect that the memory of low prio jobs gets reclaimed first.
Specifically we set memory.low to protect the working-set for important
jobs. Due to the best-effort behavior of 'low', the important jobs can
still be affected if not enough memory reclaimed from the low prio ones.
And we don't use 'min' (yet?) because the need for flexibility when
memory is tight.

Best Regards,
	Abel