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authorOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>2008-11-06 12:53:49 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2008-11-06 15:41:20 -0800
commitd3dfa8228f87ab9960ab8b4718013d68e3c25a43 (patch)
tree236784875a5c735688e644fe8412649e5fdbfcd7 /fs/fat/fat.h
parent52e9d9f4b32a3bec91feb76c84e37b7dcffe5040 (diff)
downloadlinux-2.6.38-lt-ux500-d3dfa8228f87ab9960ab8b4718013d68e3c25a43.tar.gz
fat: improve fat_hash()
fat_hash() is using the algorithm known as bad. Instead of it, this uses hash_32(). The following is the summary of test. old hash: hash func (1000 times): 33489 cycles total inodes in hash table: 70926 largest bucket contains: 696 smallest bucket contains: 54 new hash: hash func (1000 times): 33129 cycles total inodes in hash table: 70926 largest bucket contains: 315 smallest bucket contains: 236 Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/fat/fat.h')
-rw-r--r--fs/fat/fat.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/fs/fat/fat.h b/fs/fat/fat.h
index a2a570f8171..2b8e94c3eef 100644
--- a/fs/fat/fat.h
+++ b/fs/fat/fat.h
@@ -43,7 +43,6 @@ struct fat_mount_options {
#define FAT_HASH_BITS 8
#define FAT_HASH_SIZE (1UL << FAT_HASH_BITS)
-#define FAT_HASH_MASK (FAT_HASH_SIZE-1)
/*
* MS-DOS file system in-core superblock data