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Btrfs: Throttle operations if the reference cache gets too large

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A large reference cache is directly related to a lot of work pending
for the cleaner thread.  This throttles back new operations based on
the size of the reference cache so the cleaner thread will be able to keep
up.

Overall, this actually makes the FS faster because the cleaner thread will
be more likely to find things in cache.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-07-29 16:15:18 -04:00
parent 1a3f5d0400
commit ab78c84de1
7 changed files with 58 additions and 22 deletions
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10
fs/btrfs/inode.c
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@@ -2482,7 +2482,7 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
btrfs_update_inode_block_group(trans, dir);
out_unlock:
nr = trans->blocks_used;
btrfs_end_transaction(trans, root);
btrfs_end_transaction_throttle(trans, root);
fail:
if (drop_inode) {
inode_dec_link_count(inode);
@@ -2535,7 +2535,7 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
drop_inode = 1;
nr = trans->blocks_used;
btrfs_end_transaction(trans, root);
btrfs_end_transaction_throttle(trans, root);
fail:
if (drop_inode) {
inode_dec_link_count(inode);
@@ -2609,7 +2609,7 @@ static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
out_fail:
nr = trans->blocks_used;
btrfs_end_transaction(trans, root);
btrfs_end_transaction_throttle(trans, root);
out_unlock:
if (drop_on_err)
@@ -3434,7 +3434,7 @@ static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
goto out_fail;
out_fail:
btrfs_end_transaction(trans, root);
btrfs_end_transaction_throttle(trans, root);
out_unlock:
return ret;
}
@@ -3548,7 +3548,7 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
out_unlock:
nr = trans->blocks_used;
btrfs_end_transaction(trans, root);
btrfs_end_transaction_throttle(trans, root);
out_fail:
if (drop_inode) {
inode_dec_link_count(inode);