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| author | Dave Kleikamp <shaggy@austin.ibm.com> | 2006-09-18 20:12:33 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-19 07:59:59 -0700 |
| commit | 833f73299fdf4497af1552e219e95661f4d2cdca (patch) | |
| tree | 3a8cbf486dce86116ada64d170896141ceee4692 | |
| parent | ac7fb273ca1d0b4fb354575bb6e101ffd09e0b54 (diff) | |
| download | blackbird-op-linux-833f73299fdf4497af1552e219e95661f4d2cdca.tar.gz blackbird-op-linux-833f73299fdf4497af1552e219e95661f4d2cdca.zip | |
[PATCH] EXT2: Remove superblock lock contention in ext2_statfs
Fix a performance degradation introduced in 2.6.17. (30% degradation
running dbench with 16 threads)
Commit 21730eed11de42f22afcbd43f450a1872a0b5ea1, which claims to make
EXT2_DEBUG work again, moves the taking of the kernel lock out of
debug-only code in ext2_count_free_inodes and ext2_count_free_blocks and
into ext2_statfs.
The same problem was fixed in ext3 by removing the lock completely (commit
5b11687924e40790deb0d5f959247ade82196665)
Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | fs/ext2/balloc.c | 1 | ||||
| -rw-r--r-- | fs/ext2/ialloc.c | 1 | ||||
| -rw-r--r-- | fs/ext2/super.c | 2 |
3 files changed, 0 insertions, 4 deletions
diff --git a/fs/ext2/balloc.c b/fs/ext2/balloc.c index d4870432ecfc..b1981d0e95ad 100644 --- a/fs/ext2/balloc.c +++ b/fs/ext2/balloc.c @@ -539,7 +539,6 @@ unsigned long ext2_count_free (struct buffer_head * map, unsigned int numchars) #endif /* EXT2FS_DEBUG */ -/* Superblock must be locked */ unsigned long ext2_count_free_blocks (struct super_block * sb) { struct ext2_group_desc * desc; diff --git a/fs/ext2/ialloc.c b/fs/ext2/ialloc.c index de85c61c58c5..695f69ccf908 100644 --- a/fs/ext2/ialloc.c +++ b/fs/ext2/ialloc.c @@ -637,7 +637,6 @@ fail: return ERR_PTR(err); } -/* Superblock must be locked */ unsigned long ext2_count_free_inodes (struct super_block * sb) { struct ext2_group_desc *desc; diff --git a/fs/ext2/super.c b/fs/ext2/super.c index ca5bfb6914d2..4286ff6330b6 100644 --- a/fs/ext2/super.c +++ b/fs/ext2/super.c @@ -1083,7 +1083,6 @@ static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) unsigned long overhead; int i; - lock_super(sb); if (test_opt (sb, MINIX_DF)) overhead = 0; else { @@ -1124,7 +1123,6 @@ static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) buf->f_files = le32_to_cpu(sbi->s_es->s_inodes_count); buf->f_ffree = ext2_count_free_inodes (sb); buf->f_namelen = EXT2_NAME_LEN; - unlock_super(sb); return 0; } |
