Hi JeffleXu, On Mon, May 17, 2021 at 02:16:39PM +0800, JeffleXu wrote: > Hi all, > > What's the latest progress of this bio-based polling feature? > > I've noticed that hch has also sent a patch set on this [1]. But as far > as I know, hch's patch set only refactors the interface of polling in > the block layer. It indeed helps bio-based polling for some kind of > bio-based driver, but for DM/MD where one bio could be mapped to several > split bios, more work is obviously needed, just like Lei Ming's > io_context related code in this patch set. > > hch may have better idea, after all [1] is just a preparation patch set. Yeah, we have to rebase V6 against Christoph's patchset anyway. Looks there is at least two approaches left for us: 1) keep the generic approach in V6, just rebase after Christoph's patch is finalized 2) support io polling simply in bio driver, since bio->bi_cookie is assigned for underlying bio, and it shouldn't be very difficult to support that in DM/MD. I have been thinking of it a while, but not coding it yet. BTW, all underlying bios can be linked to DM bio->bi_next, and we can add one new callback of .io_poll for polling DM/MD's bio. Thanks, Ming
