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From:   Shakeel Butt <shakeelb@google.com>
Date:   Fri, 20 Aug 2021 04:42:07 -0700
Message-ID: <CALvZod5usW9OEsJSbeGYBnSGVDNLLKqMoGAx-JQrX6s62r-XiA@mail.gmail.com>
Subject: Re: [PATCH v2] mm: Add configuration to control whether vmpressure
 notifier is enabled
To:     yongw.pur@gmail.com
Cc:     Tejun Heo <tj@kernel.org>, Jonathan Corbet <corbet@lwn.net>,
        Andrew Morton <akpm@linux-foundation.org>,
        Michal Hocko <mhocko@kernel.org>,
        Vladimir Davydov <vdavydov.dev@gmail.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        "Peter Zijlstra (Intel)" <peterz@infradead.org>,
        Roman Gushchin <guro@fb.com>, alexs@kernel.org,
        Wei Yang <richard.weiyang@gmail.com>, Hui Su <sh_def@163.com>,
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        Linux MM <linux-mm@kvack.org>, yang.yang29@zte.com.cn,
        wangyong <wang.yong@zte.com.cn>
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On Thu, Aug 19, 2021 at 4:54 PM <yongw.pur@gmail.com> wrote:
>
> From: wangyong <wang.yong@zte.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().