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Btrfs: use a slab for ordered extents allocation

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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>
This commit is contained in:
Miao Xie
2012-09-06 04:01:51 -06:00
committed by Chris Mason
parent b9a8cc5bef
commit 6352b91da1
3 changed files with 31 additions and 3 deletions
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23
fs/btrfs/ordered-data.c
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@ -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);
}