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Fri, 24 Jun 2022 11:21:26 -0700 (PDT) From: cgel.zte@gmail.com X-Google-Original-From: ran.xiaokai@zte.com.cn To: viro@zeniv.linux.org.uk, hughd@google.com Cc: ran.xiaokai@zte.com.cn, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH] drop caches: skip tmpfs and ramfs Date: Fri, 24 Jun 2022 18:21:21 +0000 Message-Id: <20220624182121.995294-1-ran.xiaokai@zte.com.cn> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 ARC-Authentication-Results: i=1; imf13.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=VufbRJ4G; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (imf13.hostedemail.com: domain of cgel.zte@gmail.com designates 209.85.216.48 as permitted sender) smtp.mailfrom=cgel.zte@gmail.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1656094888; a=rsa-sha256; cv=none; b=8NkzIrHbYpiyteOuG1hlQm37RpJ6svMihqkhYgFm3J7SoEqxZpf4SDsX7KoTJzsUB0XGuQ V1jkO/iRrMPoG3HJQ0Pw7ESdShVbq68WCncl1DpeRsQZpv0jZj+NXCfMFNcezYitRafw40 mH9YSAOsHihRn0Bq6LIHOLO8BRyZiuk= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1656094888; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding:in-reply-to: references:dkim-signature; bh=P5YJ65pvDdEwq3atTRzFu054q854VYDQ/r8rcFUwysg=; b=SVAeds63hQho5dWWUeK1Gzondx3fOVXhJc2+d5yPh2hZDoFZE8rDqyJlxANAPmoa3yVyQN YgfUyXk9OS3e/+60Sj3mmx2ntyKebxpbUWRImWVZsFX226VDiyEPMTGwAR6pxjU+BNZo2b eqZ7SMaelN08nCnxNHJXwvh7Qme3Y/0= X-Stat-Signature: qkwbkcy85nccdjpbkhptbdkqigjjiswb X-Rspamd-Server: rspam08 X-Rspam-User: X-Rspamd-Queue-Id: 9AC9320017 Authentication-Results: imf13.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=VufbRJ4G; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (imf13.hostedemail.com: domain of cgel.zte@gmail.com designates 209.85.216.48 as permitted sender) smtp.mailfrom=cgel.zte@gmail.com X-HE-Tag: 1656094888-630938 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Ran Xiaokai All tmpfs and ramfs pages have PG_dirty bit set once they are allocated and added to the pagecache。So pages can not be freed from tmpfs or ramfs. So skip tmpfs and ramfs when drop caches. Signed-off-by: Ran Xiaokai --- fs/drop_caches.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/drop_caches.c b/fs/drop_caches.c index e619c31b6bd9..600c043c1eb7 100644 --- a/fs/drop_caches.c +++ b/fs/drop_caches.c @@ -10,6 +10,7 @@ #include #include #include +#include #include "internal.h" /* A global variable is a bit ugly, but it keeps the code simple */ @@ -19,6 +20,9 @@ static void drop_pagecache_sb(struct super_block *sb, void *unused) { struct inode *inode, *toput_inode = NULL; + if (sb->s_magic == TMPFS_MAGIC || sb->s_magic == RAMFS_MAGIC) + return; + spin_lock(&sb->s_inode_list_lock); list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { spin_lock(&inode->i_lock);