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

On Wed,  4 Aug 2021 16:20:10 +0800 zhangkui [off-list ref] wrote:

quoted

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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