On Mon, Sep 25, 2017 at 03:23:16PM +, Bart Van Assche wrote:
> On Mon, 2017-09-25 at 11:06 +0800, Ming Lei wrote:
> > On Fri, Sep 22, 2017 at 05:54:48PM +, Bart Van Assche wrote:
> > > On Sat, 2017-09-23 at 01:44 +0800, Ming Lei wrote:
> > > > On Fri, Sep 22, 2017 at 03:06:16PM +, Bart
On Mon, 2017-09-25 at 11:06 +0800, Ming Lei wrote:
> On Fri, Sep 22, 2017 at 05:54:48PM +, Bart Van Assche wrote:
> > On Sat, 2017-09-23 at 01:44 +0800, Ming Lei wrote:
> > > On Fri, Sep 22, 2017 at 03:06:16PM +, Bart Van Assche wrote:
> > > > On Fri, 2017-09-22 at 09:35 +0800, Ming Lei
On Fri, Sep 22, 2017 at 05:54:48PM +, Bart Van Assche wrote:
> On Sat, 2017-09-23 at 01:44 +0800, Ming Lei wrote:
> > On Fri, Sep 22, 2017 at 03:06:16PM +, Bart Van Assche wrote:
> > > On Fri, 2017-09-22 at 09:35 +0800, Ming Lei wrote:
> > > > + /*
> > > > +*
On Sat, 2017-09-23 at 01:44 +0800, Ming Lei wrote:
> On Fri, Sep 22, 2017 at 03:06:16PM +, Bart Van Assche wrote:
> > On Fri, 2017-09-22 at 09:35 +0800, Ming Lei wrote:
> > > + /*
> > > + * blk-mq's SCHED_RESTART can cover this requeue, so
> > > + * we needn't to deal
On Fri, Sep 22, 2017 at 03:06:16PM +, Bart Van Assche wrote:
> On Fri, 2017-09-22 at 09:35 +0800, Ming Lei wrote:
> > + /*
> > +* blk-mq's SCHED_RESTART can cover this requeue, so
> > +* we needn't to deal with it by DELAY_REQUEUE. More
> > +*
On Fri, 2017-09-22 at 09:35 +0800, Ming Lei wrote:
> + /*
> + * blk-mq's SCHED_RESTART can cover this requeue, so
> + * we needn't to deal with it by DELAY_REQUEUE. More
> + * importantly, we have to return DM_MAPIO_REQUEUE
> + * so
blk-mq will rerun queue via RESTART after one request is completed,
so not necessary to wait random time for requeuing, we should trust
blk-mq to do it.
More importantly, we need return BLK_STS_RESOURCE to blk-mq
so that dequeue from I/O scheduler can be stopped, then
I/O merge gets improved.
