Btrfs: Lower contention on the csum mutex
This takes the csum mutex deeper in the call chain and releases it
more often.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/async-thread.c b/fs/btrfs/async-thread.c
index 958cd8b..2ee3017 100644
--- a/fs/btrfs/async-thread.c
+++ b/fs/btrfs/async-thread.c
@@ -48,6 +48,7 @@
/* number of things on the pending list */
atomic_t num_pending;
+
unsigned long sequence;
/* protects the pending list. */
@@ -242,7 +243,7 @@
worker = list_entry(next, struct btrfs_worker_thread, worker_list);
atomic_inc(&worker->num_pending);
worker->sequence++;
- if (worker->sequence % 4 == 0)
+ if (worker->sequence % workers->idle_thresh == 0)
list_move_tail(next, &workers->worker_list);
return worker;
}