From: Ming Lei <ming.lei@redhat.com>
To: JeffleXu <jefflexu@linux.alibaba.com>
Cc: Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, Mike Snitzer <snitzer@redhat.com>,
dm-devel@redhat.com, Hannes Reinecke <hare@suse.de>
Subject: Re: [PATCH V6 00/12] block: support bio based io polling
Date: Mon, 17 May 2021 15:13:29 +0800 [thread overview]
Message-ID: <YKIXmRTmLlAgO3AK@T590> (raw)
In-Reply-To: <630a63ef-f9e0-6ad6-d6be-ec7a46e5ec45@linux.alibaba.com>
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
prev parent reply other threads:[~2021-05-17 7:15 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-22 12:20 [PATCH V6 00/12] block: support bio based io polling Ming Lei
2021-04-22 12:20 ` [PATCH V6 01/12] block: add helper of blk_queue_poll Ming Lei
2021-04-22 12:20 ` [PATCH V6 02/12] block: define 'struct bvec_iter' as packed Ming Lei
2021-04-22 13:18 ` Hannes Reinecke
2021-04-22 12:20 ` [PATCH V6 03/12] block: add one helper to free io_context Ming Lei
2021-04-22 12:20 ` [PATCH V6 04/12] block: move block polling code into one dedicated source file Ming Lei
2021-04-22 13:19 ` Hannes Reinecke
2021-04-26 7:12 ` Hannes Reinecke
2021-04-22 12:20 ` [PATCH V6 05/12] block: extract one helper function polling hw queue Ming Lei
2021-04-22 12:20 ` [PATCH V6 06/12] block: prepare for supporting bio_list via other link Ming Lei
2021-04-22 12:20 ` [PATCH V6 07/12] block: create io poll context for submission and poll task Ming Lei
2021-04-22 12:20 ` [PATCH V6 08/12] block: add req flag of REQ_POLL_CTX Ming Lei
2021-04-22 12:20 ` [PATCH V6 09/12] block: use per-task poll context to implement bio based io polling Ming Lei
2021-04-26 7:17 ` Hannes Reinecke
2021-04-22 12:20 ` [PATCH V6 10/12] block: limit hw queues to be polled in each blk_poll() Ming Lei
2021-04-26 7:19 ` Hannes Reinecke
2021-04-26 8:00 ` Ming Lei
2021-04-26 9:05 ` Hannes Reinecke
2021-04-22 12:20 ` [PATCH V6 11/12] block: allow to control FLAG_POLL via sysfs for bio poll capable queue Ming Lei
2021-04-26 7:20 ` Hannes Reinecke
2021-04-22 12:20 ` [PATCH V6 12/12] dm: support IO polling for bio-based dm device Ming Lei
2021-04-23 1:32 ` JeffleXu
2021-04-23 2:39 ` Ming Lei
2021-04-23 2:38 ` [PATCH V7 " Ming Lei
2021-05-17 6:16 ` [PATCH V6 00/12] block: support bio based io polling JeffleXu
2021-05-17 7:13 ` Ming Lei [this message]
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