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mm: swap: add back full cluster when no entry is reclaimed

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If no swap cache is reclaimed, cluster taken off from full_clusters list
will not be put in any list and we can't reclaime HAS_CACHE slots
efficiently.  Do relocate_cluster for such cluster to avoid inefficiency.

Link: https://lkml.kernel.org/r/20250224113910.522439-1-shikemeng@huaweicloud.com
Fixes: 3b644773ee ("mm, swap: reduce contention on device lock")
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Reviewed-by: Kairui Song <kasong@tencent.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kemeng Shi 2025-02-24 19:39:10 +08:00 committed by Andrew Morton
parent 47b16d0462
commit 51f271c194
1 changed files with 4 additions and 0 deletions
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4
mm/swapfile.c
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@ -858,6 +858,10 @@ static void swap_reclaim_full_clusters(struct swap_info_struct *si, bool force)
offset++;
}
/* in case no swap cache is reclaimed */
if (ci->flags == CLUSTER_FLAG_NONE)
relocate_cluster(si, ci);
unlock_cluster(ci);
if (to_scan <= 0)
break;