[merged mm-stable] mm-swap-skip-scanning-cluster-range-if-its-empty-cluster.patch removed from -mm tree

[merged mm-stable] mm-swap-skip-scanning-cluster-range-if-its-empty-cluster.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/swap: skip scanning cluster range if it's empty cluster
has been removed from the -mm tree.  Its filename was
     mm-swap-skip-scanning-cluster-range-if-its-empty-cluster.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: Baoquan He <bhe@redhat.com>
Subject: mm/swap: skip scanning cluster range if it's empty cluster
Date: Wed, 5 Feb 2025 17:27:13 +0800

Since ci->lock has been taken when isolating cluster from
si->free_clusters or taking si->percpu_cluster->next[order], it's
unnecessary to scan and check the cluster range availability if i'ts empty
cluster, and this can accelerate the huge page swapping.

Link: https://lkml.kernel.org/r/20250205092721.9395-5-bhe@redhat.com
Signed-off-by: Baoquan He <bhe@redhat.com>
Cc: Chris Li <chrisl@kernel.org>
Cc: Kairui Song <ryncsn@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/swapfile.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/mm/swapfile.c~mm-swap-skip-scanning-cluster-range-if-its-empty-cluster
+++ a/mm/swapfile.c
@@ -730,6 +730,9 @@ static bool cluster_scan_range(struct sw
 	unsigned long offset, end = start + nr_pages;
 	unsigned char *map = si->swap_map;
 
+	if (cluster_is_empty(ci))
+		return true;
+
 	for (offset = start; offset < end; offset++) {
 		switch (READ_ONCE(map[offset])) {
 		case 0:
_

Patches currently in -mm which might be from bhe@redhat.com are