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

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Message-ID: <804fa82c-74cc-e634-381a-8f8b0b1e3227@oppo.com>
Date:   Thu, 5 Aug 2021 04:50:01 +0000
From:   张魁(Kyler) <zhangkui@...o.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-man@...r.kernel.org" <linux-man@...r.kernel.org>
Subject: Re: [PATCH] mm/madvise: add MADV_WILLNEED to process_madvise()

On 8/5/2021 10:04, Andrew Morton wrote:
> 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?
>

I pushed a patch, please help to review it.
https://lore.kernel.org/patchwork/patch/1472380/
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