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| author | Theodore Ts'o <tytso@mit.edu> | 2009-03-04 19:09:10 -0500 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2009-03-04 19:09:10 -0500 |
| commit | 9f24e4208f7ee2748f157368b63287dc903fcf60 (patch) | |
| tree | 255989fe69ebfb2b031dc7cf6dbe975df67c711a /fs/ext4/mballoc.c | |
| parent | b713a5ec55bf73c833f9883cdd761b20ee61a1ab (diff) | |
| download | blackbird-op-linux-9f24e4208f7ee2748f157368b63287dc903fcf60.tar.gz blackbird-op-linux-9f24e4208f7ee2748f157368b63287dc903fcf60.zip | |
ext4: Use atomic_t's in struct flex_groups
Reduce pressure on the sb_bgl_lock family of locks by using atomic_t's
to track the number of free blocks and inodes in each flex_group.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/mballoc.c')
| -rw-r--r-- | fs/ext4/mballoc.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index c4c430977622..e72c72a0b807 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -3044,9 +3044,8 @@ ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac, if (sbi->s_log_groups_per_flex) { ext4_group_t flex_group = ext4_flex_group(sbi, ac->ac_b_ex.fe_group); - spin_lock(sb_bgl_lock(sbi, flex_group)); - sbi->s_flex_groups[flex_group].free_blocks -= ac->ac_b_ex.fe_len; - spin_unlock(sb_bgl_lock(sbi, flex_group)); + atomic_sub(ac->ac_b_ex.fe_len, + &sbi->s_flex_groups[flex_group].free_blocks); } err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); @@ -4884,9 +4883,7 @@ do_more: if (sbi->s_log_groups_per_flex) { ext4_group_t flex_group = ext4_flex_group(sbi, block_group); - spin_lock(sb_bgl_lock(sbi, flex_group)); - sbi->s_flex_groups[flex_group].free_blocks += count; - spin_unlock(sb_bgl_lock(sbi, flex_group)); + atomic_add(count, &sbi->s_flex_groups[flex_group].free_blocks); } ext4_mb_release_desc(&e4b); |
