The quilt patch titled
Subject: mm/page_alloc: add some detailed comments in can_steal_fallback
has been removed from the -mm tree. Its filename was
mm-page_alloc-add-some-detailed-comments-in-can_steal_fallback.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: gaoxiang17 <gaoxiang17@xxxxxxxxxx>
Subject: mm/page_alloc: add some detailed comments in can_steal_fallback
Date: Fri, 20 Sep 2024 20:20:30 +0800
[akpm@xxxxxxxxxxxxxxxxxxxx: tweak grammar, fit to 80 cols]
Link: https://lkml.kernel.org/r/20240920122030.159751-1-gxxa03070307@xxxxxxxxx
Signed-off-by: gaoxiang17 <gaoxiang17@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/mm/page_alloc.c~mm-page_alloc-add-some-detailed-comments-in-can_steal_fallback
+++ a/mm/page_alloc.c
@@ -1855,6 +1855,14 @@ static bool can_steal_fallback(unsigned
if (order >= pageblock_order)
return true;
+ /*
+ * Movable pages won't cause permanent fragmentation, so when you alloc
+ * small pages, you just need to temporarily steal unmovable or
+ * reclaimable pages that are closest to the request size. After a
+ * while, memory compaction may occur to form large contiguous pages,
+ * and the next movable allocation may not need to steal. Unmovable and
+ * reclaimable allocations need to actually steal pages.
+ */
if (order >= pageblock_order / 2 ||
start_mt == MIGRATE_RECLAIMABLE ||
start_mt == MIGRATE_UNMOVABLE ||
_
Patches currently in -mm which might be from gaoxiang17@xxxxxxxxxx are
