linux-kernel - [PATCH v3 3/6] mm/vmscan: activate swap-backed executable folios after first usage

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

Message-ID: <20220425111232.23182-4-linmiaohe@huawei.com>
Date:   Mon, 25 Apr 2022 19:12:29 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>
CC:     <ying.huang@...el.com>, <iamjoonsoo.kim@....com>, <hch@....de>,
        <osalvador@...e.de>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <linmiaohe@...wei.com>
Subject: [PATCH v3 3/6] mm/vmscan: activate swap-backed executable folios after first usage

We should activate swap-backed executable folios (e.g. tmpfs) after first
usage so that executable code gets yet better chance to stay in memory.

Suggested-by: Huang, Ying <ying.huang@...el.com>
Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
Reviewed-by: Huang, Ying <ying.huang@...el.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
---
 mm/vmscan.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 7dcc8cf4526f..82e6fa83c472 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1415,9 +1415,9 @@ static enum page_references folio_check_references(struct folio *folio,
 			return PAGEREF_ACTIVATE;
 
 		/*
-		 * Activate file-backed executable folios after first usage.
+		 * Activate executable folios after first usage.
 		 */
-		if ((vm_flags & VM_EXEC) && !folio_test_swapbacked(folio))
+		if (vm_flags & VM_EXEC)
 			return PAGEREF_ACTIVATE;
 
 		return PAGEREF_KEEP;
-- 
2.23.0