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authorJan Kara <jack@suse.cz>2008-04-29 00:59:39 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-29 08:06:05 -0700
commitaf065b8a19041554196971d8b6ae1459798d3b14 (patch)
tree33bfa04388cecfc50dda596302c3a5c91d0e2b64
parenteccb95cee4f0d56faa46ef22fb94dd4a3578d3eb (diff)
downloadlinux-af065b8a19041554196971d8b6ae1459798d3b14.tar.gz
vfs: skip inodes without pages to free in drop_pagecache_sb()
Many inodes have no pagecache, so we can avoid lots of lock-takings. Signed-off-by: Jan Kara <jack@suse.cz> Cc: Fengguang Wu <wfg@mail.ustc.edu.cn> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/drop_caches.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/drop_caches.c b/fs/drop_caches.c
index 50f9087635d..3e5637fc377 100644
--- a/fs/drop_caches.c
+++ b/fs/drop_caches.c
@@ -20,6 +20,8 @@ static void drop_pagecache_sb(struct super_block *sb)
list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
if (inode->i_state & (I_FREEING|I_WILL_FREE))
continue;
+ if (inode->i_mapping->nrpages == 0)
+ continue;
__iget(inode);
spin_unlock(&inode_lock);
__invalidate_mapping_pages(inode->i_mapping, 0, -1, true);