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rbd: use a single workqueue for all devices 

Using one queue per device doesn't make much sense given that our
workfn processes "devices" and not "requests".  Switch to a single
workqueue for all devices.

Signed-off-by: Ilya Dryomov <idryomov@redhat.com>
Reviewed-by: Sage Weil <sage@redhat.com>
This commit is contained in:
Ilya Dryomov 2014-10-09 17:06:01 +04:00
parent cac7f24298
commit f5ee37bd31
1 changed files with 18 additions and 15 deletions
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33
drivers/block/rbd.c
View File

@ -342,7 +342,6 @@ struct rbd_device {
struct list_head rq_queue; /* incoming rq queue */
spinlock_t lock; /* queue, flags, open_count */
struct workqueue_struct *rq_wq;
struct work_struct rq_work;
struct rbd_image_header header;
@ -402,6 +401,8 @@ static struct kmem_cache *rbd_segment_name_cache;
static int rbd_major;
static DEFINE_IDA(rbd_dev_id_ida);
static struct workqueue_struct *rbd_wq;
/*
* Default to false for now, as single-major requires >= 0.75 version of
* userspace rbd utility.
@ -3452,7 +3453,7 @@ static void rbd_request_fn(struct request_queue *q)
}
if (queued)
queue_work(rbd_dev->rq_wq, &rbd_dev->rq_work);
queue_work(rbd_wq, &rbd_dev->rq_work);
}
/*
@ -5242,16 +5243,9 @@ static int rbd_dev_device_setup(struct rbd_device *rbd_dev)
set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE);
set_disk_ro(rbd_dev->disk, rbd_dev->mapping.read_only);
rbd_dev->rq_wq = alloc_workqueue("%s", WQ_MEM_RECLAIM, 0,
rbd_dev->disk->disk_name);
if (!rbd_dev->rq_wq) {
ret = -ENOMEM;
goto err_out_mapping;
}
ret = rbd_bus_add_dev(rbd_dev);
if (ret)
goto err_out_workqueue;
goto err_out_mapping;
/* Everything's ready. Announce the disk to the world. */
@ -5263,9 +5257,6 @@ static int rbd_dev_device_setup(struct rbd_device *rbd_dev)
return ret;
err_out_workqueue:
destroy_workqueue(rbd_dev->rq_wq);
rbd_dev->rq_wq = NULL;
err_out_mapping:
rbd_dev_mapping_clear(rbd_dev);
err_out_disk:
@ -5512,7 +5503,6 @@ static void rbd_dev_device_release(struct device *dev)
{
struct rbd_device *rbd_dev = dev_to_rbd_dev(dev);
destroy_workqueue(rbd_dev->rq_wq);
rbd_free_disk(rbd_dev);
clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags);
rbd_dev_mapping_clear(rbd_dev);
@ -5716,11 +5706,21 @@ static int __init rbd_init(void)
if (rc)
return rc;
/*
* The number of active work items is limited by the number of
* rbd devices, so leave @max_active at default.
*/
rbd_wq = alloc_workqueue(RBD_DRV_NAME, WQ_MEM_RECLAIM, 0);
if (!rbd_wq) {
rc = -ENOMEM;
goto err_out_slab;
}
if (single_major) {
rbd_major = register_blkdev(0, RBD_DRV_NAME);
if (rbd_major < 0) {
rc = rbd_major;
goto err_out_slab;
goto err_out_wq;
}
}
@ -5738,6 +5738,8 @@ static int __init rbd_init(void)
err_out_blkdev:
if (single_major)
unregister_blkdev(rbd_major, RBD_DRV_NAME);
err_out_wq:
destroy_workqueue(rbd_wq);
err_out_slab:
rbd_slab_exit();
return rc;
@ -5749,6 +5751,7 @@ static void __exit rbd_exit(void)
rbd_sysfs_cleanup();
if (single_major)
unregister_blkdev(rbd_major, RBD_DRV_NAME);
destroy_workqueue(rbd_wq);
rbd_slab_exit();
}