linux-kernel - [PATCH v1] mm/vmscan: simplify the nr assignment logic for pages to scan

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 for Android: free password hash cracker in your pocket

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

Message-Id: <20221110113130.284290-1-Chao.Xu9@zeekrlife.com>
Date:   Thu, 10 Nov 2022 19:31:30 +0800
From:   Chao Xu <amos.xuchao@...il.com>
To:     akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Chao Xu <Chao.Xu9@...krlife.com>
Subject: [PATCH v1] mm/vmscan: simplify the nr assignment logic for pages to scan

By default the assignment logic of anonymouns or file inactive
pages and active pages to scan using the same duplicated code
snippet. To simplify the logic, merge the same part.

Signed-off-by: Chao Xu <Chao.Xu9@...krlife.com>
---
 mm/vmscan.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 04d8b88e5216..69e458e51c81 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -5932,14 +5932,11 @@ static void shrink_lruvec(struct lruvec *lruvec, struct scan_control *sc)
 		 * scan target and the percentage scanning already complete
 		 */
 		lru = (lru == LRU_FILE) ? LRU_BASE : LRU_FILE;
-		nr_scanned = targets[lru] - nr[lru];
-		nr[lru] = targets[lru] * (100 - percentage) / 100;
-		nr[lru] -= min(nr[lru], nr_scanned);
-
-		lru += LRU_ACTIVE;
-		nr_scanned = targets[lru] - nr[lru];
-		nr[lru] = targets[lru] * (100 - percentage) / 100;
-		nr[lru] -= min(nr[lru], nr_scanned);
+		for ( ; lru <= lru + LRU_ACTIVE; lru += LRU_ACTIVE) {
+			nr_scanned = targets[lru] - nr[lru];
+			nr[lru] = targets[lru] * (100 - percentage) / 100;
+			nr[lru] -= min(nr[lru], nr_scanned);
+		}
 
 		scan_adjusted = true;
 	}
-- 
2.34.1