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Date: Wed, 02 Mar 2011 12:53:10 +0000
From: "Jan Beulich" <JBeulich@...ell.com>
To: "Jens Axboe" <axboe@...nel.dk>, "Tejun Heo" <tj@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>,
<linux-ide@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2.6.38-rc5 1/2] block: add @force_kblockd to
__blk_run_queue()
>>> On 17.02.11 at 12:15, Tejun Heo <tj@...nel.org> wrote:
> __blk_run_queue() automatically either calls q->request_fn() directly
> or schedules kblockd depending on whether the function is recursed.
> blk-flush implementation needs to be able to explicitly choose
> kblockd. Add @force_kblockd.
>
> All the current users are converted to specify %false for the
> parameter and this patch doesn't introduce any behavior change.
>
> stable: This is prerequisite for fixing ide oops caused by the new
> blk-flush implementation.
>
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: Jan Beulich <JBeulich@...ell.com>
> Cc: James Bottomley <James.Bottomley@...senPartnership.com>
> Cc: stable@...nel.org
May I ask what the disposition of this and the second patch is?
Looking at 2.6.38-rc7 I still don't see either of them, while I
had hoped that they would both also make it into 2.6.37.2...
Thanks, Jan
> ---
> block/blk-core.c | 11 ++++++-----
> block/blk-flush.c | 2 +-
> block/cfq-iosched.c | 6 +++---
> block/elevator.c | 4 ++--
> drivers/scsi/scsi_lib.c | 2 +-
> drivers/scsi/scsi_transport_fc.c | 2 +-
> include/linux/blkdev.h | 2 +-
> 7 files changed, 15 insertions(+), 14 deletions(-)
>
> Index: work/block/blk-core.c
> ===================================================================
> --- work.orig/block/blk-core.c
> +++ work/block/blk-core.c
> @@ -352,7 +352,7 @@ void blk_start_queue(struct request_queu
> WARN_ON(!irqs_disabled());
>
> queue_flag_clear(QUEUE_FLAG_STOPPED, q);
> - __blk_run_queue(q);
> + __blk_run_queue(q, false);
> }
> EXPORT_SYMBOL(blk_start_queue);
>
> @@ -403,13 +403,14 @@ EXPORT_SYMBOL(blk_sync_queue);
> /**
> * __blk_run_queue - run a single device queue
> * @q: The queue to run
> + * @force_kblockd: Don't run @q->request_fn directly. Use kblockd.
> *
> * Description:
> * See @blk_run_queue. This variant must be called with the queue lock
> * held and interrupts disabled.
> *
> */
> -void __blk_run_queue(struct request_queue *q)
> +void __blk_run_queue(struct request_queue *q, bool force_kblockd)
> {
> blk_remove_plug(q);
>
> @@ -423,7 +424,7 @@ void __blk_run_queue(struct request_queu
> * Only recurse once to avoid overrunning the stack, let the unplug
> * handling reinvoke the handler shortly if we already got there.
> */
> - if (!queue_flag_test_and_set(QUEUE_FLAG_REENTER, q)) {
> + if (!force_kblockd && !queue_flag_test_and_set(QUEUE_FLAG_REENTER, q)) {
> q->request_fn(q);
> queue_flag_clear(QUEUE_FLAG_REENTER, q);
> } else {
> @@ -446,7 +447,7 @@ void blk_run_queue(struct request_queue
> unsigned long flags;
>
> spin_lock_irqsave(q->queue_lock, flags);
> - __blk_run_queue(q);
> + __blk_run_queue(q, false);
> spin_unlock_irqrestore(q->queue_lock, flags);
> }
> EXPORT_SYMBOL(blk_run_queue);
> @@ -1053,7 +1054,7 @@ void blk_insert_request(struct request_q
>
> drive_stat_acct(rq, 1);
> __elv_add_request(q, rq, where, 0);
> - __blk_run_queue(q);
> + __blk_run_queue(q, false);
> spin_unlock_irqrestore(q->queue_lock, flags);
> }
> EXPORT_SYMBOL(blk_insert_request);
> Index: work/block/blk-flush.c
> ===================================================================
> --- work.orig/block/blk-flush.c
> +++ work/block/blk-flush.c
> @@ -69,7 +69,7 @@ static void blk_flush_complete_seq_end_i
> * queue. Kick the queue in those cases.
> */
> if (was_empty && next_rq)
> - __blk_run_queue(q);
> + __blk_run_queue(q, false);
> }
>
> static void pre_flush_end_io(struct request *rq, int error)
> Index: work/block/cfq-iosched.c
> ===================================================================
> --- work.orig/block/cfq-iosched.c
> +++ work/block/cfq-iosched.c
> @@ -3355,7 +3355,7 @@ cfq_rq_enqueued(struct cfq_data *cfqd, s
> cfqd->busy_queues > 1) {
> cfq_del_timer(cfqd, cfqq);
> cfq_clear_cfqq_wait_request(cfqq);
> - __blk_run_queue(cfqd->queue);
> + __blk_run_queue(cfqd->queue, false);
> } else {
> cfq_blkiocg_update_idle_time_stats(
> &cfqq->cfqg->blkg);
> @@ -3370,7 +3370,7 @@ cfq_rq_enqueued(struct cfq_data *cfqd, s
> * this new queue is RT and the current one is BE
> */
> cfq_preempt_queue(cfqd, cfqq);
> - __blk_run_queue(cfqd->queue);
> + __blk_run_queue(cfqd->queue, false);
> }
> }
>
> @@ -3731,7 +3731,7 @@ static void cfq_kick_queue(struct work_s
> struct request_queue *q = cfqd->queue;
>
> spin_lock_irq(q->queue_lock);
> - __blk_run_queue(cfqd->queue);
> + __blk_run_queue(cfqd->queue, false);
> spin_unlock_irq(q->queue_lock);
> }
>
> Index: work/block/elevator.c
> ===================================================================
> --- work.orig/block/elevator.c
> +++ work/block/elevator.c
> @@ -602,7 +602,7 @@ void elv_quiesce_start(struct request_qu
> */
> elv_drain_elevator(q);
> while (q->rq.elvpriv) {
> - __blk_run_queue(q);
> + __blk_run_queue(q, false);
> spin_unlock_irq(q->queue_lock);
> msleep(10);
> spin_lock_irq(q->queue_lock);
> @@ -651,7 +651,7 @@ void elv_insert(struct request_queue *q,
> * with anything. There's no point in delaying queue
> * processing.
> */
> - __blk_run_queue(q);
> + __blk_run_queue(q, false);
> break;
>
> case ELEVATOR_INSERT_SORT:
> Index: work/drivers/scsi/scsi_lib.c
> ===================================================================
> --- work.orig/drivers/scsi/scsi_lib.c
> +++ work/drivers/scsi/scsi_lib.c
> @@ -443,7 +443,7 @@ static void scsi_run_queue(struct reques
> &sdev->request_queue->queue_flags);
> if (flagset)
> queue_flag_set(QUEUE_FLAG_REENTER, sdev->request_queue);
> - __blk_run_queue(sdev->request_queue);
> + __blk_run_queue(sdev->request_queue, false);
> if (flagset)
> queue_flag_clear(QUEUE_FLAG_REENTER, sdev->request_queue);
> spin_unlock(sdev->request_queue->queue_lock);
> Index: work/drivers/scsi/scsi_transport_fc.c
> ===================================================================
> --- work.orig/drivers/scsi/scsi_transport_fc.c
> +++ work/drivers/scsi/scsi_transport_fc.c
> @@ -3829,7 +3829,7 @@ fc_bsg_goose_queue(struct fc_rport *rpor
> !test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags);
> if (flagset)
> queue_flag_set(QUEUE_FLAG_REENTER, rport->rqst_q);
> - __blk_run_queue(rport->rqst_q);
> + __blk_run_queue(rport->rqst_q, false);
> if (flagset)
> queue_flag_clear(QUEUE_FLAG_REENTER, rport->rqst_q);
> spin_unlock_irqrestore(rport->rqst_q->queue_lock, flags);
> Index: work/include/linux/blkdev.h
> ===================================================================
> --- work.orig/include/linux/blkdev.h
> +++ work/include/linux/blkdev.h
> @@ -699,7 +699,7 @@ extern void blk_start_queue(struct reque
> extern void blk_stop_queue(struct request_queue *q);
> extern void blk_sync_queue(struct request_queue *q);
> extern void __blk_stop_queue(struct request_queue *q);
> -extern void __blk_run_queue(struct request_queue *);
> +extern void __blk_run_queue(struct request_queue *q, bool force_kblockd);
> extern void blk_run_queue(struct request_queue *);
> extern int blk_rq_map_user(struct request_queue *, struct request *,
> struct rq_map_data *, void __user *, unsigned long,
--
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