linux-kernel - Re: [PATCH v3] mm/ksm: introduce ksm

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Date:   Sat, 7 May 2022 10:59:26 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     cgel.zte@...il.com
Cc:     keescook@...omium.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        xu xin <xu.xin16@....com.cn>,
        Yang Yang <yang.yang29@....com.cn>,
        Ran Xiaokai <ran.xiaokai@....com.cn>,
        wangyong <wang.yong12@....com.cn>,
        Yunkai Zhang <zhang.yunkai@....com.cn>
Subject: Re: [PATCH v3] mm/ksm: introduce ksm_force for each process

On Sat,  7 May 2022 05:47:02 +0000 cgel.zte@...il.com wrote:

> To use KSM, we must explicitly call madvise() in application code,
> which means installed apps on OS needs to be uninstall and source
> code needs to be modified. It is inconvenient.
> 
> In order to change this situation, We add a new proc 'ksm_force'
> under /proc/<pid>/ to support turning on/off KSM scanning of a
> process's mm dynamically.
> 
> If ksm_force is set as 1, force all anonymous and 'qualified' vma
> of this mm to be involved in KSM scanning without explicitly
> calling madvise to make vma MADV_MERGEABLE. But It is effctive only
> when the klob of '/sys/kernel/mm/ksm/run' is set as 1.
> 
> If ksm_enale is set as 0, cancel the feature of ksm_force of this
> process and unmerge those merged pages which is not madvised as
> MERGEABLE of this process, but leave MERGEABLE areas merged.
> 

There are quite a lot of typos here.  Please proof-read it.

>  fs/proc/base.c           | 99 ++++++++++++++++++++++++++++++++++++++++
>  include/linux/mm_types.h |  9 ++++
>  mm/ksm.c                 | 32 ++++++++++++-

And please update the appropriate places under Documentation/ - all
user-facing interfaces should be well documented.