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Btrfs: Lower contention on the csum mutex

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This takes the csum mutex deeper in the call chain and releases it
more often.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-08-15 15:34:18 -04:00
parent 4854ddd0ed
commit 53863232ef
4 changed files with 22 additions and 8 deletions
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3
fs/btrfs/async-thread.c
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@@ -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. */
@@ -242,7 +243,7 @@ static struct btrfs_worker_thread *next_worker(struct btrfs_workers *workers)
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;
}