linux-kernel - Re: [PATCH v2] mm: Add configuration to control whether vmpressure notifier is enabled

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Message-ID: <CALvZod5usW9OEsJSbeGYBnSGVDNLLKqMoGAx-JQrX6s62r-XiA@mail.gmail.com>
Date:   Fri, 20 Aug 2021 04:42:07 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     yongw.pur@...il.com
Cc:     Tejun Heo <tj@...nel.org>, Jonathan Corbet <corbet@....net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Roman Gushchin <guro@...com>, alexs@...nel.org,
        Wei Yang <richard.weiyang@...il.com>, Hui Su <sh_def@....com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        wang.yong12@....com.cn, Cgroups <cgroups@...r.kernel.org>,
        linux-doc@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>, yang.yang29@....com.cn,
        wangyong <wang.yong@....com.cn>
Subject: Re: [PATCH v2] mm: Add configuration to control whether vmpressure
 notifier is enabled

On Thu, Aug 19, 2021 at 4:54 PM <yongw.pur@...il.com> wrote:
>
> From: wangyong <wang.yong@....com.cn>
>
> Inspired by PSI features, vmpressure inotifier function should
> also be configured to decide whether it is used, because it is an
> independent feature which notifies the user of memory pressure.
>

It is also used by the networking stack to check memory pressure. See
mem_cgroup_under_socket_pressure().