Commit 749fefe6 authored by Tejun Heo's avatar Tejun Heo Committed by Jens Axboe
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block: lift the initial queue bypass mode on blk_register_queue() instead of...

block: lift the initial queue bypass mode on blk_register_queue() instead of blk_init_allocated_queue()


 ("blkcg: make request_queue bypassing on allocation") made
request_queues bypassed on allocation to avoid switching on and off
bypass mode on a queue being initialized.  Some drivers allocate and
then destroy a lot of queues without fully initializing them and
incurring bypass latency overhead on each of them could add upto
significant overhead.

Unfortunately, blk_init_allocated_queue() is never used by queues of
bio-based drivers, which means that all bio-based driver queues are in
bypass mode even after initialization and registration complete

Due to the limited way request_queues are used by bio drivers, this
problem is hidden pretty well but it shows up when blk-throttle is
used in combination with a bio-based driver.  Trying to configure
(echoing to cgroupfs file) blk-throttle for a bio-based driver hangs
indefinitely in blkg_conf_prep() waiting for bypass mode to end.

This patch moves the initial blk_queue_bypass_end() call from
blk_init_allocated_queue() to blk_register_queue() which is called for
any userland-visible queues regardless of its type.

I believe this is correct because I don't think there is any block
driver which needs or wants working elevator and blk-cgroup on a queue
which isn't visible to userland.  If there are such users, we need a
different solution.
Signed-off-by: default avatarTejun Heo <>
Reported-by: default avatarJoseph Glanville <>
Acked-by: default avatarVivek Goyal <>
Signed-off-by: default avatarJens Axboe <>
parent 66ba32dc
......@@ -608,8 +608,8 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
* A queue starts its life with bypass turned on to avoid
* unnecessary bypass on/off overhead and nasty surprises during
* init. The initial bypass will be finished at the end of
* blk_init_allocated_queue().
* init. The initial bypass will be finished when the queue is
* registered by blk_register_queue().
q->bypass_depth = 1;
__set_bit(QUEUE_FLAG_BYPASS, &q->queue_flags);
......@@ -712,9 +712,6 @@ blk_init_allocated_queue(struct request_queue *q, request_fn_proc *rfn,
/* init elevator */
if (elevator_init(q, NULL))
return NULL;
/* all done, end the initial bypass */
return q;
......@@ -561,6 +561,12 @@ int blk_register_queue(struct gendisk *disk)
if (WARN_ON(!q))
return -ENXIO;
* Initialization must be complete by now. Finish the initial
* bypass from queue allocation.
ret = blk_trace_init_sysfs(dev);
if (ret)
return ret;
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