The patch titled
Subject: mm/madvise: add MADV_WILLNEED to process_madvise()
has been removed from the -mm tree. Its filename was
mm-madvise-add-madv_willneed-to-process_madvise.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: zhangkui <zhangkui@xxxxxxxx>
Subject: mm/madvise: add MADV_WILLNEED to process_madvise()
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, System Management Software can read-ahead memory
of the process immediately when the app switches to forground. Calling
process_madvise() with MADV_WILLNEED can meet this need.
Link: https://lkml.kernel.org/r/20210804082010.12482-1-zhangkui@xxxxxxxx
Signed-off-by: zhangkui <zhangkui@xxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/madvise.c | 1 +
1 file changed, 1 insertion(+)
--- a/mm/madvise.c~mm-madvise-add-madv_willneed-to-process_madvise
+++ a/mm/madvise.c
@@ -1048,6 +1048,7 @@ process_madvise_behavior_valid(int behav
switch (behavior) {
case MADV_COLD:
case MADV_PAGEOUT:
+ case MADV_WILLNEED:
return true;
default:
return false;
_
Patches currently in -mm which might be from zhangkui@xxxxxxxx are
