linux-kernel - Re: [PATCH] mm/madvise: add MADV_WILLNEED to process

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Message-Id: <20210804190402.8b9dbac3c4f417945c6d1de2@linux-foundation.org>
Date:   Wed, 4 Aug 2021 19:04:02 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     zhangkui <zhangkui@...o.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-man@...r.kernel.org
Subject: Re: [PATCH] mm/madvise: add MADV_WILLNEED to process_madvise()

On Wed,  4 Aug 2021 16:20:10 +0800 zhangkui <zhangkui@...o.com> wrote:

> There is a usecase in Android that an app process's memory is swapped out
> by process_madvise() with MADV_PAGEOUT, such as the memory is swapped to
> zram or a backing device. When the process is scheduled to running, like
> switch to foreground, multiple page faults may cause the app dropped
> frames.
> To reduce the problem, SMS can read-ahead memory of the process immediately
> when the app switches to forground.
> Calling process_madvise() with MADV_WILLNEED can meet this need.

This will require a small update to the process_madvise(2) manpage. 
Can you please send a patch?