On Wed, 2017-10-18 at 12:22 +0200, Roman Pen wrote:
> the patch below fixes queue stalling when shared hctx marked for restart
> (BLK_MQ_S_SCHED_RESTART bit) but q->shared_hctx_restart stays zero.
Since I have been able to reproduce this queue stall with an upstream driver
(ib_srp) and since I als
On Mon, 2017-10-23 at 17:12 +0200, Roman Penyaev wrote:
> On Fri, Oct 20, 2017 at 10:05 PM, Bart Van Assche wrote:
> > Commit 6d8c6c0f97ad is something I came up with to fix queue lockups in the
> > SCSI and dm-mq drivers.
>
> You mean fairness? (some hctx get less amount of chances to be restarte
On Mon, Oct 23, 2017 at 06:12:29PM +0200, Roman Penyaev wrote:
> Hi Ming,
>
> On Fri, Oct 20, 2017 at 3:39 PM, Ming Lei wrote:
> > On Wed, Oct 18, 2017 at 12:22:06PM +0200, Roman Pen wrote:
> >> Hi all,
> >>
> >> the patch below fixes queue stalling when shared hctx marked for restart
> >> (BLK_M
Hi Ming,
On Fri, Oct 20, 2017 at 3:39 PM, Ming Lei wrote:
> On Wed, Oct 18, 2017 at 12:22:06PM +0200, Roman Pen wrote:
>> Hi all,
>>
>> the patch below fixes queue stalling when shared hctx marked for restart
>> (BLK_MQ_S_SCHED_RESTART bit) but q->shared_hctx_restart stays zero. The
>> root caus
On Fri, Oct 20, 2017 at 10:05 PM, Bart Van Assche
wrote:
> On Fri, 2017-10-20 at 11:39 +0200, Roman Penyaev wrote:
>> But what bothers me is these looong loops inside blk_mq_sched_restart(),
>> and since you are the author of the original 6d8c6c0f97ad ("blk-mq: Restart
>> a single queue if tag set
On Fri, 2017-10-20 at 11:39 +0200, Roman Penyaev wrote:
> But what bothers me is these looong loops inside blk_mq_sched_restart(),
> and since you are the author of the original 6d8c6c0f97ad ("blk-mq: Restart
> a single queue if tag sets are shared") I want to ask what was the original
> problem wh
Hi Bart,
On Thu, Oct 19, 2017 at 7:47 PM, Bart Van Assche wrote:
> On Wed, 2017-10-18 at 12:22 +0200, Roman Pen wrote:
>> the patch below fixes queue stalling when shared hctx marked for restart
>> (BLK_MQ_S_SCHED_RESTART bit) but q->shared_hctx_restart stays zero. The
>> root cause is that hctx
On Wed, 2017-10-18 at 12:22 +0200, Roman Pen wrote:
> the patch below fixes queue stalling when shared hctx marked for restart
> (BLK_MQ_S_SCHED_RESTART bit) but q->shared_hctx_restart stays zero. The
> root cause is that hctxs are shared between queues, but 'shared_hctx_restart'
> belongs to the
Hi all,
the patch below fixes queue stalling when shared hctx marked for restart
(BLK_MQ_S_SCHED_RESTART bit) but q->shared_hctx_restart stays zero. The
root cause is that hctxs are shared between queues, but 'shared_hctx_restart'
belongs to the particular queue, which in fact may not need to be
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