On Fri, 10 Oct 2014, Ilya Dryomov wrote: > 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 <[email protected]>
Reviewed-by: Sage Weil <[email protected]> > --- > drivers/block/rbd.c | 33 ++++++++++++++++++--------------- > 1 file changed, 18 insertions(+), 15 deletions(-) > > diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c > index 0a54c588e433..be8d44af6ae1 100644 > --- a/drivers/block/rbd.c > +++ b/drivers/block/rbd.c > @@ -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(); > } > > -- > 1.7.10.4 > > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to [email protected] > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
