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

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Date:   Sun, 22 Aug 2021 18:06:00 +0800
From:   yong w <yongw.pur@...il.com>
To:     Shakeel Butt <shakeelb@...gle.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

Hello, I find the code of socket pressure and vmpressure are related.
And there are two ways to be discussed
1. The calculation of socket pressure is handed over to the psi.
2. Vmpresssure and psi update socket pressure respectively, and are
configured separately.

Thanks.

yong w <yongw.pur@...il.com> 于2021年8月20日周五 下午10:29写道：
>
> Shakeel Butt <shakeelb@...gle.com> 于2021年8月20日周五 下午7:42写道：
> >
> > 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().
>
>  Thanks for your replly, mem_cgroup_under_socket_pressure does use vmpressue,
>  I'll check it.