diff options
| author | Jens Axboe <axboe@suse.de> | 2006-03-28 08:59:01 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@suse.de> | 2006-03-28 08:59:01 +0200 |
| commit | e2d74ac0664c89757bde8fb18c98cd7bf53da61c (patch) | |
| tree | 1e858044a9180766eae4ec694d4200c4ae850406 /include | |
| parent | 329b10bb0feacb7fb9a41389313ff0a51ae56f2a (diff) | |
[PATCH] [BLOCK] cfq-iosched: change cfq io context linking from list to tree
On setups with many disks, we spend a considerable amount of time
looking up the process-disk mapping on each queue of io. Testing with
a NULL based block driver, this costs 40-50% reduction in throughput
for 1000 disks.
Signed-off-by: Jens Axboe <axboe@suse.de>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/blkdev.h | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index c179966f1a2f..ed0ffa673568 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -55,13 +55,11 @@ struct as_io_context { struct cfq_queue; struct cfq_io_context { - /* - * circular list of cfq_io_contexts belonging to a process io context - */ - struct list_head list; - struct cfq_queue *cfqq[2]; + struct rb_node rb_node; void *key; + struct cfq_queue *cfqq[2]; + struct io_context *ioc; unsigned long last_end_request; @@ -72,8 +70,8 @@ struct cfq_io_context { struct list_head queue_list; - void (*dtor)(struct cfq_io_context *); - void (*exit)(struct cfq_io_context *); + void (*dtor)(struct io_context *); /* destructor */ + void (*exit)(struct io_context *); /* called on task exit */ }; /* @@ -94,7 +92,7 @@ struct io_context { int nr_batch_requests; /* Number of requests left in the batch */ struct as_io_context *aic; - struct cfq_io_context *cic; + struct rb_root cic_root; }; void put_io_context(struct io_context *ioc); |