linux-kernel - [PATCH v2] mm: add lazyfree folio to lru tail

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <f29f64e29c08427b95e3df30a5770056@honor.com>
Date: Fri, 16 Aug 2024 07:48:01 +0000
From: gaoxu <gaoxu2@...or.com>
To: Andrew Morton <akpm@...ux-foundation.org>
CC: "linux-mm@...ck.org" <linux-mm@...ck.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, Suren Baghdasaryan <surenb@...gle.com>,
	Shaohua Li <shli@...com>, yipengxiang <yipengxiang@...or.com>, fengbaopeng
	<fengbaopeng@...or.com>, Kalesh Singh <kaleshsingh@...gle.com>
Subject: [PATCH v2] 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.

Signed-off-by: gao xu <gaoxu2@...onor.com>
---
V1 -> V2: Based on the latest mm-unstable, recreate the patch.

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

diff --git a/mm/swap.c b/mm/swap.c
index 6b838986d..e0dbfc983 100644
--- 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);
-- 
2.17.1