Btrfs: Change the congestion functions to meter the number of async submits as well
The async submit workqueue was absorbing too many requests, leading to long
stalls where the async submitters were stalling.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index a9377fb..293464c 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -522,6 +522,7 @@
struct work_struct async_submit_work;
spinlock_t end_io_work_lock;
spinlock_t async_submit_work_lock;
+ atomic_t nr_async_submits;
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
struct work_struct trans_work;