+ mm-add-lazyfree-folio-to-lru-tail.patch added to mm-unstable branch

+ mm-add-lazyfree-folio-to-lru-tail.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm: add lazyfree folio to lru tail
has been added to the -mm mm-unstable branch.  Its filename is
     mm-add-lazyfree-folio-to-lru-tail.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-add-lazyfree-folio-to-lru-tail.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: gaoxu <gaoxu2@honor.com>
Subject: mm: add lazyfree folio to lru tail
Date: Fri, 16 Aug 2024 07:48:01 +0000

Replace lruvec_add_folio with lruvec_add_folio_tail in the lru_lazyfree_fn:

1. The lazy-free folio is added to the LRU_INACTIVE_FILE list.  If
   it's moved to the LRU tail, it allows for faster release lazy-free
   folio and reduces the impact on file refault.

2. When mglru is enabled, the lazy-free folio is reclaimabled and
   should be added using lru_gen_add_folio(lruvec, folio, true) instead of
   lru_gen_add_folio(lruvec, folio, false) for adding to gen.

With the change in place, workingset_refault_file is reduced by 33% in the
continuous startup testing of the applications in the Android system.

Link: https://lkml.kernel.org/r/f29f64e29c08427b95e3df30a5770056@honor.com
Signed-off-by: gao xu <gaoxu2@hihonor.com>
Cc: Kalesh Singh <kaleshsingh@google.com>
Cc: Shaohua Li <shli@fb.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/swap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/swap.c~mm-add-lazyfree-folio-to-lru-tail
+++ a/mm/swap.c
@@ -641,7 +641,7 @@ static void lru_lazyfree(struct lruvec *
 	 * anonymous folios
 	 */
 	folio_clear_swapbacked(folio);
-	lruvec_add_folio(lruvec, folio);
+	lruvec_add_folio_tail(lruvec, folio);
 
 	__count_vm_events(PGLAZYFREE, nr_pages);
 	__count_memcg_events(lruvec_memcg(lruvec), PGLAZYFREE, nr_pages);
_

Patches currently in -mm which might be from gaoxu2@honor.com are

mm-add-lazyfree-folio-to-lru-tail.patch