mm: add lazyfree folio to lru tail

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>

diff --git a/mm/swap.c b/mm/swap.c
index 6b838986d2940fcafccef4dcb833abd23d87b838..e0dbfc98318e58ebb61cbd710c30cd4ddcf9d406 100644 (file)
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -641,7 +641,7 @@ static void lru_lazyfree(struct lruvec *lruvec, struct folio *folio)
         * 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);