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Received-SPF: Pass (protection.outlook.com: domain of oppo.com designates 58.252.5.68 as permitted sender) receiver=protection.outlook.com; client-ip=58.252.5.68; helo=mail.oppo.com; pr=C Received: from mail.oppo.com (58.252.5.68) by SG2PEPF000B66CD.mail.protection.outlook.com (10.167.240.27) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8293.12 via Frontend Transport; Thu, 26 Dec 2024 13:23:09 +0000 Received: from PH80250894.adc.com (172.16.40.118) by mailappw31.adc.com (172.16.56.198) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Thu, 26 Dec 2024 21:23:09 +0800 From: hailong To: , CC: , , , , <21cnbao@gmail.com>, Hailong Liu Subject: [RFC PATCH] mm/madvise: enable files from read-only block for MADV_PAGEOUT Date: Thu, 26 Dec 2024 21:22:59 +0800 Message-ID: <20241226132259.7975-1-hailong.liu@oppo.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Originating-IP: [172.16.40.118] X-ClientProxiedBy: mailappw30.adc.com (172.16.56.197) To mailappw31.adc.com (172.16.56.198) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SG2PEPF000B66CD:EE_|KL1PR02MB7311:EE_ X-MS-Office365-Filtering-Correlation-Id: ba01107f-e77b-4480-dd8a-08dd25b07132 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|82310400026|1800799024|36860700013; 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In this case, the system daemon reclaim page cache using process_madvise(vmas, MADV_PAGEOUT). However, currently only inode_owner_or_capable() or file_permission(vma->vm_file, MAY_WRITE) == 0 meet the conditions of can_do_file_pageout(). In fact, for read-only block devices, we can directly discard these pages and free up memory. The test results are as follows: Before Pss Private Private SwapPss Rss Heap Heap Heap Total Dirty Clean Dirty Total Size Alloc Free ------ ------ ------ ------ ------ ------ ------ ------ .so mmap 199 0 0 128 27616 .jar mmap 748 0 88 0 39444 .apk mmap 6818 0 6188 0 8076 .dex mmap 102 0 80 44 1120 .oat mmap 148 0 0 0 11836 .art mmap 341 0 8 652 30748 Other mmap 42 0 0 4 2228 Unknown 5 0 0 1012 1528 TOTAL 17984 0 6372 9412 138096 31023 13628 17394 After Pss Private Private SwapPss Rss Heap Heap Heap Total Dirty Clean Dirty Total Size Alloc Free ------ ------ ------ ------ ------ ------ ------ ------ .so mmap 206 0 0 132 27332 .jar mmap 625 0 0 0 39288 .apk mmap 613 0 0 0 1668 .dex mmap 22 0 0 44 1040 .oat mmap 151 0 0 0 11836 .art mmap 340 0 0 636 30756 Other mmap 44 0 0 4 2248 Unknown 6 0 0 1004 1532 TOTAL 11801 0 8 9624 131336 28939 13485 15453 From above we can see the *.apk mmap* is reclaimed. Signed-off-by: Hailong Liu --- mm/madvise.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) -- 2.30.0 diff --git a/mm/madvise.c b/mm/madvise.c index 8e5bf11af1b2..503ee5e03b7e 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -337,12 +337,13 @@ static inline bool can_do_file_pageout(struct vm_area_struct *vma) return false; /* * paging out pagecache only for non-anonymous mappings that correspond - * to the files the calling process could (if tried) open for writing; - * otherwise we'd be including shared non-exclusive mappings, which - * opens a side channel. + * to the files the calling process could (if tried) open for writing or + * file from read-only super block; otherwise we'd be including + * shared non-exclusive mappings, which opens a side channel. */ return inode_owner_or_capable(&nop_mnt_idmap, file_inode(vma->vm_file)) || + sb_rdonly(file_inode(vma->vm_file)->i_sb) || file_permission(vma->vm_file, MAY_WRITE) == 0; }