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mm/swap: skip scanning cluster range if it's empty cluster

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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>
This commit is contained in:
Baoquan He 2025-02-05 17:27:13 +08:00 committed by Andrew Morton
parent 0eb7d2c337
commit 9b9cba7289
1 changed files with 3 additions and 0 deletions
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3
mm/swapfile.c
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@ -730,6 +730,9 @@ static bool cluster_scan_range(struct swap_info_struct *si,
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: