Well, when it will failover, it will probably be directed to the poll
queues. Maybe I'm missing something...
In this patchset, because it isn't submitted directly from FS, there
isn't one polling context associated with this bio, so its HIPRI flag
will be cleared, then fallback to irq mode.
On Tue, Mar 23, 2021 at 09:54:36AM -0700, Sagi Grimberg wrote:
>
> > > > +static void blk_bio_poll_post_submit(struct bio *bio, blk_qc_t cookie)
> > > > +{
> > > > + bio->bi_iter.bi_private_data = cookie;
> > > > +}
> > > > +
> > >
> > > Hey Ming, thinking about nvme-mpath, I'm thinking
+static void blk_bio_poll_post_submit(struct bio *bio, blk_qc_t cookie)
+{
+ bio->bi_iter.bi_private_data = cookie;
+}
+
Hey Ming, thinking about nvme-mpath, I'm thinking that this should be
an exported function for failover. nvme-mpath updates bio.bi_dev
when re-submitting I/Os to an
On Mon, Mar 22, 2021 at 08:46:04PM -0700, Sagi Grimberg wrote:
>
> > +static void blk_bio_poll_post_submit(struct bio *bio, blk_qc_t cookie)
> > +{
> > + bio->bi_iter.bi_private_data = cookie;
> > +}
> > +
>
> Hey Ming, thinking about nvme-mpath, I'm thinking that this should be
> an exported
On Fri, Mar 19, 2021 at 02:38:11PM -0400, Mike Snitzer wrote:
> On Thu, Mar 18 2021 at 12:48pm -0400,
> Ming Lei wrote:
>
> > Currently bio based IO poll needs to poll all hw queue blindly, this way
> > is very inefficient, and the big reason is that we can't pass bio
> > submission result to io
On Sat, Mar 20, 2021 at 01:56:13PM +0800, JeffleXu wrote:
>
>
> On 3/19/21 9:46 PM, Ming Lei wrote:
> > On Fri, Mar 19, 2021 at 05:38:38PM +0800, JeffleXu wrote:
> >> I'm thinking how this mechanism could work with *original* bio-based
> >> devices that don't ne built upon mq devices, such as
+static void blk_bio_poll_post_submit(struct bio *bio, blk_qc_t cookie)
+{
+ bio->bi_iter.bi_private_data = cookie;
+}
+
Hey Ming, thinking about nvme-mpath, I'm thinking that this should be
an exported function for failover. nvme-mpath updates bio.bi_dev
when re-submitting I/Os to an
I'm thinking how this mechanism could work with *original* bio-based
devices that don't ne built upon mq devices, such as nvdimm. This
mechanism (also including my original design) mainly focuses on virtual
devices that built upon mq devices, i.e., md/dm.
As the original bio-based devices wants
On 3/19/21 9:46 PM, Ming Lei wrote:
> On Fri, Mar 19, 2021 at 05:38:38PM +0800, JeffleXu wrote:
>> I'm thinking how this mechanism could work with *original* bio-based
>> devices that don't ne built upon mq devices, such as nvdimm. This
>
> non-mq device needs driver to implement io polling by
On Thu, Mar 18 2021 at 12:48pm -0400,
Ming Lei wrote:
> Currently bio based IO poll needs to poll all hw queue blindly, this way
> is very inefficient, and the big reason is that we can't pass bio
> submission result to io poll task.
This is awkward because bio-based IO polling doesn't exist
On Fri, Mar 19, 2021 at 05:38:38PM +0800, JeffleXu wrote:
> I'm thinking how this mechanism could work with *original* bio-based
> devices that don't ne built upon mq devices, such as nvdimm. This
non-mq device needs driver to implement io polling by itself, block
layer can't help it, and that
On Thu, Mar 18, 2021 at 01:26:22PM -0400, Mike Snitzer wrote:
> On Thu, Mar 18 2021 at 12:48pm -0400,
> Ming Lei wrote:
>
> > Currently bio based IO poll needs to poll all hw queue blindly, this way
> > is very inefficient, and the big reason is that we can't pass bio
> > submission result to io
On Thu, Mar 18, 2021 at 1:26 PM Mike Snitzer wrote:
>
> On Thu, Mar 18 2021 at 12:48pm -0400,
> Ming Lei wrote:
>
> > Currently bio based IO poll needs to poll all hw queue blindly, this way
> > is very inefficient, and the big reason is that we can't pass bio
> > submission result to io poll
On Thu, Mar 18 2021 at 12:48pm -0400,
Ming Lei wrote:
> Currently bio based IO poll needs to poll all hw queue blindly, this way
> is very inefficient, and the big reason is that we can't pass bio
> submission result to io poll task.
>
> In IO submission context, track associated underlying
Currently bio based IO poll needs to poll all hw queue blindly, this way
is very inefficient, and the big reason is that we can't pass bio
submission result to io poll task.
In IO submission context, track associated underlying bios by per-task
submission queue and save 'cookie' poll data in
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