The quilt patch titled
Subject: mm: compaction: skip fast freepages isolation if enough freepages are isolated
has been removed from the -mm tree. Its filename was
mm-compaction-skip-fast-freepages-isolation-if-enough-freepages-are-isolated.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: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Subject: mm: compaction: skip fast freepages isolation if enough freepages are isolated
Date: Thu, 25 May 2023 20:54:01 +0800
I've observed that fast isolation often isolates more pages than
cc->migratepages, and the excess freepages will be released back to the
buddy system. So skip fast freepages isolation if enough freepages are
isolated to save some CPU cycles.
Link: https://lkml.kernel.org/r/f39c2c07f2dba2732fd9c0843572e5bef96f7f67.1685018752.git.baolin.wang@xxxxxxxxxxxxxxxxx
Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/compaction.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/mm/compaction.c~mm-compaction-skip-fast-freepages-isolation-if-enough-freepages-are-isolated
+++ a/mm/compaction.c
@@ -1528,6 +1528,10 @@ static void fast_isolate_freepages(struc
spin_unlock_irqrestore(&cc->zone->lock, flags);
+ /* Skip fast search if enough freepages isolated */
+ if (cc->nr_freepages >= cc->nr_migratepages)
+ break;
+
/*
* Smaller scan on next order so the total scan is related
* to freelist_scan_limit.
_
Patches currently in -mm which might be from baolin.wang@xxxxxxxxxxxxxxxxx are
