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author | Miao Xie <miaox@cn.fujitsu.com> | 2012-09-06 10:01:51 (GMT) |
---|---|---|
committer | Chris Mason <chris.mason@fusionio.com> | 2012-10-01 19:19:11 (GMT) |
commit | 6352b91da1a2108bb8cc5115e8714f90d706f15f (patch) | |
tree | 41897bbe836bb7f8b2bbfef24528407d1c79b8b0 /fs/btrfs/ordered-data.c | |
parent | b9a8cc5bef963b76c5b6c3016b7e91988a3e758b (diff) | |
download | linux-fsl-qoriq-6352b91da1a2108bb8cc5115e8714f90d706f15f.tar.xz |
Btrfs: use a slab for ordered extents allocation
The ordered extent allocation is in the fast path of the IO, so use a slab
to improve the speed of the allocation.
"Size of the struct is 280, so this will fall into the size-512 bucket,
giving 8 objects per page, while own slab will pack 14 objects into a page.
Another benefit I see is to check for leaked objects when the module is
removed (and the cache destroy takes place)."
-- David Sterba
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Diffstat (limited to 'fs/btrfs/ordered-data.c')
-rw-r--r-- | fs/btrfs/ordered-data.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c index cd8ecb7..e2b3d99 100644 --- a/fs/btrfs/ordered-data.c +++ b/fs/btrfs/ordered-data.c @@ -25,6 +25,8 @@ #include "btrfs_inode.h" #include "extent_io.h" +static struct kmem_cache *btrfs_ordered_extent_cache; + static u64 entry_end(struct btrfs_ordered_extent *entry) { if (entry->file_offset + entry->len < entry->file_offset) @@ -187,7 +189,7 @@ static int __btrfs_add_ordered_extent(struct inode *inode, u64 file_offset, struct btrfs_ordered_extent *entry; tree = &BTRFS_I(inode)->ordered_tree; - entry = kzalloc(sizeof(*entry), GFP_NOFS); + entry = kmem_cache_zalloc(btrfs_ordered_extent_cache, GFP_NOFS); if (!entry) return -ENOMEM; @@ -421,7 +423,7 @@ void btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry) list_del(&sum->list); kfree(sum); } - kfree(entry); + kmem_cache_free(btrfs_ordered_extent_cache, entry); } } @@ -958,3 +960,20 @@ void btrfs_add_ordered_operation(struct btrfs_trans_handle *trans, } spin_unlock(&root->fs_info->ordered_extent_lock); } + +int __init ordered_data_init(void) +{ + btrfs_ordered_extent_cache = kmem_cache_create("btrfs_ordered_extent", + sizeof(struct btrfs_ordered_extent), 0, + SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, + NULL); + if (!btrfs_ordered_extent_cache) + return -ENOMEM; + return 0; +} + +void ordered_data_exit(void) +{ + if (btrfs_ordered_extent_cache) + kmem_cache_destroy(btrfs_ordered_extent_cache); +} |