linux-kernel - Re: [PATCH v1] mm: Add configuration to control whether vmpressure notifier is enabled

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Date:   Fri, 13 Aug 2021 13:36:01 +0100
From:   Chris Down <chris@...isdown.name>
To:     yongw.pur@...il.com
Cc:     tj@...nel.org, corbet@....net, akpm@...ux-foundation.org,
        mhocko@...nel.org, vdavydov.dev@...il.com, tglx@...utronix.de,
        peterz@...radead.org, shakeelb@...gle.com, guro@...com,
        alexs@...nel.org, richard.weiyang@...il.com, sh_def@....com,
        sfr@...b.auug.org.au, wang.yong12@....com.cn,
        cgroups@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        yang.yang29@....com.cn
Subject: Re: [PATCH v1] mm: Add configuration to control whether vmpressure
 notifier is enabled

yongw.pur@...il.com writes:
>From: wangyong <wang.yong12@....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.
>
>Since the vmpressure interface is used in kernel common code, for
>users who do not use the vmpressure function, there will be
>additional overhead.

Could you please demonstrate this additional overhead with profiles or 
demonstrations of other real world effects? Thanks.