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Btrfs: Wait for kernel threads to make progress during async submission

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Before this change, btrfs would use a bdi congestion function to make
sure there weren't too many pending async checksum work items.

This change makes the process creating async work items wait instead,
leading to fewer congestion returns from the bdi.  This improves
pdflush background_writeout scanning.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-08-15 15:34:17 -04:00
parent 5443be45f5
commit 4854ddd0ed
3 changed files with 33 additions and 20 deletions
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7
fs/btrfs/async-thread.c
View file

@ -48,6 +48,7 @@ struct btrfs_worker_thread {
/* number of things on the pending list */
atomic_t num_pending;
unsigned long sequence;
/* protects the pending list. */
spinlock_t lock;
@ -197,6 +198,7 @@ int btrfs_start_workers(struct btrfs_workers *workers, int num_workers)
spin_lock_irq(&workers->lock);
list_add_tail(&worker->worker_list, &workers->idle_list);
worker->idle = 1;
workers->num_workers++;
spin_unlock_irq(&workers->lock);
}
@ -238,7 +240,10 @@ static struct btrfs_worker_thread *next_worker(struct btrfs_workers *workers)
*/
next = workers->worker_list.next;
worker = list_entry(next, struct btrfs_worker_thread, worker_list);
list_move_tail(next, &workers->worker_list);
atomic_inc(&worker->num_pending);
worker->sequence++;
if (worker->sequence % 4 == 0)
list_move_tail(next, &workers->worker_list);
return worker;
}