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authorTheodore Ts'o <tytso@mit.edu>2008-10-09 23:53:47 -0400
committerTheodore Ts'o <tytso@mit.edu>2008-10-09 23:53:47 -0400
commit240799cdf22bd789ea6852653c3b879d35ad0a6c (patch)
treee696b60cc103f23838b5c14d8d397f692abffbc3 /fs/ext4/ext4.h
parent37515facd001942221d68171c81c1f46d54ffdd0 (diff)
ext4: Use readahead when reading an inode from the inode table
With modern hard drives, reading 64k takes roughly the same time as reading a 4k block. So request readahead for adjacent inode table blocks to reduce the time it takes when iterating over directories (especially when doing this in htree sort order) in a cold cache case. With this patch, the time it takes to run "git status" on a kernel tree after flushing the caches via "echo 3 > /proc/sys/vm/drop_caches" is reduced by 21%. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/ext4.h')
-rw-r--r--fs/ext4/ext4.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 163c44527dd..922d18720c9 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -790,6 +790,8 @@ static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
#define EXT4_DEF_RESUID 0
#define EXT4_DEF_RESGID 0
+#define EXT4_DEF_INODE_READAHEAD_BLKS 32
+
/*
* Default mount options
*/