diff options
Diffstat (limited to 'fs/btrfs/volumes.c')
| -rw-r--r-- | fs/btrfs/volumes.c | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 8bc6a880748..9d361819200 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -163,6 +163,7 @@ static noinline int run_scheduled_bios(struct btrfs_device *device) unsigned long num_sync_run; unsigned long limit; unsigned long last_waited = 0; + int force_reg = 0; bdi = blk_get_backing_dev_info(device->bdev); fs_info = device->dev_root->fs_info; @@ -176,19 +177,22 @@ static noinline int run_scheduled_bios(struct btrfs_device *device) loop: spin_lock(&device->io_lock); - num_run = 0; loop_lock: + num_run = 0; /* take all the bios off the list at once and process them * later on (without the lock held). But, remember the * tail and other pointers so the bios can be properly reinserted * into the list if we hit congestion */ - if (device->pending_sync_bios.head) + if (!force_reg && device->pending_sync_bios.head) { pending_bios = &device->pending_sync_bios; - else + force_reg = 1; + } else { pending_bios = &device->pending_bios; + force_reg = 0; + } pending = pending_bios->head; tail = pending_bios->tail; @@ -228,10 +232,14 @@ loop_lock: while (pending) { rmb(); - if (pending_bios != &device->pending_sync_bios && - device->pending_sync_bios.head && - num_run > 16) { - cond_resched(); + /* we want to work on both lists, but do more bios on the + * sync list than the regular list + */ + if ((num_run > 32 && + pending_bios != &device->pending_sync_bios && + device->pending_sync_bios.head) || + (num_run > 64 && pending_bios == &device->pending_sync_bios && + device->pending_bios.head)) { spin_lock(&device->io_lock); requeue_list(pending_bios, pending, tail); goto loop_lock; |