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authorChris Mason <chris.mason@oracle.com>2009-01-16 11:58:19 -0500
committerChris Mason <chris.mason@oracle.com>2009-01-16 11:58:19 -0500
commit1d9e2ae949411c2f329f30e01ea0355cd02c4296 (patch)
tree64287747fdbb1641052d8ec146c8997c3797bc48
parente293e97e363e419d8a3628a927321e3f75206a0b (diff)
downloadlinux-stericsson-1d9e2ae949411c2f329f30e01ea0355cd02c4296.tar.gz
Btrfs: Clear the device->running_pending flag before bailing on congestion
Btrfs maintains a queue of async bio submissions so the checksumming threads don't have to wait on get_request_wait. In order to avoid extra wakeups, this code has a running_pending flag that is used to tell new submissions they don't need to wake the thread. When the threads notice congestion on a single device, they may decide to requeue the job and move on to other devices. This makes sure the running_pending flag is cleared before the job is requeued. It should help avoid IO stalls by making sure the task is woken up when new submissions come in. Signed-off-by: Chris Mason <chris.mason@oracle.com>
-rw-r--r--fs/btrfs/volumes.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index b187b537888e..3451e1cca2b5 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -220,6 +220,7 @@ loop:
tail->bi_next = old_head;
else
device->pending_bio_tail = tail;
+ device->running_pending = 0;
spin_unlock(&device->io_lock);
btrfs_requeue_work(&device->work);