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authorJosef Bacik <jbacik@fb.com>2016-04-11 17:37:40 -0400
committerChris Mason <clm@fb.com>2016-06-22 17:54:18 -0700
commit31b9655f439a26856edca0f3f8daa368a61f16d5 (patch)
treeac17462f6647fa2740ba9854ffeff250917db675 /fs/btrfs
parentde18c165509edb36bde42ca6ff930854f85e21ea (diff)
downloadlinux-31b9655f439a26856edca0f3f8daa368a61f16d5.tar.bz2
Btrfs: track transid for delayed ref flushing
Using the offwakecputime bpf script I noticed most of our time was spent waiting on the delayed ref throttling. This is what is supposed to happen, but sometimes the transaction can commit and then we're waiting for throttling that doesn't matter anymore. So change this stuff to be a little smarter by tracking the transid we were in when we initiated the throttling. If the transaction we get is different then we can just bail out. This resulted in a 50% speedup in my fs_mark test, and reduced the amount of time spent throttling by 60 seconds over the entire run (which is about 30 minutes). Thanks, Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/ctree.h2
-rw-r--r--fs/btrfs/extent-tree.c15
-rw-r--r--fs/btrfs/inode.c1
-rw-r--r--fs/btrfs/transaction.c3
4 files changed, 16 insertions, 5 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 101c3cfd3f7c..4274a7bfdaed 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2518,7 +2518,7 @@ void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
struct btrfs_root *root, unsigned long count);
int btrfs_async_run_delayed_refs(struct btrfs_root *root,
- unsigned long count, int wait);
+ unsigned long count, u64 transid, int wait);
int btrfs_lookup_data_extent(struct btrfs_root *root, u64 start, u64 len);
int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 bytenr,
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 29e5d000bbee..ecfa52002363 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -2835,6 +2835,7 @@ int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans,
struct async_delayed_refs {
struct btrfs_root *root;
+ u64 transid;
int count;
int error;
int sync;
@@ -2850,9 +2851,16 @@ static void delayed_ref_async_start(struct btrfs_work *work)
async = container_of(work, struct async_delayed_refs, work);
- trans = btrfs_join_transaction(async->root);
+ trans = btrfs_attach_transaction(async->root);
if (IS_ERR(trans)) {
- async->error = PTR_ERR(trans);
+ if (PTR_ERR(trans) != -ENOENT)
+ async->error = PTR_ERR(trans);
+ goto done;
+ }
+
+ /* Don't bother flushing if we got into a different transaction */
+ if (trans->transid != async->transid) {
+ btrfs_end_transaction(trans, async->root);
goto done;
}
@@ -2876,7 +2884,7 @@ done:
}
int btrfs_async_run_delayed_refs(struct btrfs_root *root,
- unsigned long count, int wait)
+ unsigned long count, u64 transid, int wait)
{
struct async_delayed_refs *async;
int ret;
@@ -2888,6 +2896,7 @@ int btrfs_async_run_delayed_refs(struct btrfs_root *root,
async->root = root->fs_info->tree_root;
async->count = count;
async->error = 0;
+ async->transid = transid;
if (wait)
async->sync = 1;
else
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index bb62418b8023..78582e339f33 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4558,6 +4558,7 @@ delete:
BUG_ON(ret);
if (btrfs_should_throttle_delayed_refs(trans, root))
btrfs_async_run_delayed_refs(root,
+ trans->transid,
trans->delayed_ref_updates * 2, 0);
if (be_nice) {
if (truncate_space_check(trans, root,
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 765845742fde..948aa186b353 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -818,6 +818,7 @@ static int __btrfs_end_transaction(struct btrfs_trans_handle *trans,
{
struct btrfs_transaction *cur_trans = trans->transaction;
struct btrfs_fs_info *info = root->fs_info;
+ u64 transid = trans->transid;
unsigned long cur = trans->delayed_ref_updates;
int lock = (trans->type != TRANS_JOIN_NOLOCK);
int err = 0;
@@ -905,7 +906,7 @@ static int __btrfs_end_transaction(struct btrfs_trans_handle *trans,
kmem_cache_free(btrfs_trans_handle_cachep, trans);
if (must_run_delayed_refs) {
- btrfs_async_run_delayed_refs(root, cur,
+ btrfs_async_run_delayed_refs(root, cur, transid,
must_run_delayed_refs == 1);
}
return err;