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

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Message-ID: <4p22vtjrpu4obmbjivgpe635gbpjmhsfisnxghgsson2g6yy5r@ovawhchw7maq>
Date:   Mon, 19 Jun 2023 19:30:44 +0200
From:   Michal Koutný <mkoutny@...e.com>
To:     Abel Wu <wuyun.abel@...edance.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: [RFC PATCH net-next] sock: Propose socket.urgent for sockmem
 isolation

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?

Thanks,
Michal

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