From: Christoph Hellwig <hch@infradead.org>
To: Jens Axboe <axboe@kernel.dk>
Cc: Christoph Hellwig <hch@infradead.org>, linux-block@vger.kernel.org
Subject: Re: [PATCH 8/9] io_uring: utilize the io_batch infrastructure for more efficient polled IO
Date: Thu, 14 Oct 2021 09:08:38 -0700 [thread overview]
Message-ID: <YWhWBt7kljI+BGbX@infradead.org> (raw)
In-Reply-To: <7ed66f47-6f5a-39b2-7cd8-df7cf0952743@kernel.dk>
On Thu, Oct 14, 2021 at 09:45:38AM -0600, Jens Axboe wrote:
> On 10/14/21 2:03 AM, Christoph Hellwig wrote:
> > On Wed, Oct 13, 2021 at 10:54:15AM -0600, Jens Axboe wrote:
> >> @@ -2404,6 +2406,11 @@ static int io_do_iopoll(struct io_ring_ctx *ctx, bool force_nonspin)
> >> struct kiocb *kiocb = &req->rw.kiocb;
> >> int ret;
> >>
> >> + if (!file)
> >> + file = kiocb->ki_filp;
> >> + else if (file != kiocb->ki_filp)
> >> + break;
> >> +
> >
> > Can you explain why we now can only poll for a single file (independent
> > of the fact that batching is used)?
>
> Different file may be on a different backend, it's just playing it
> safe and splitting it up. In practice it should not matter.
Well, with file systems even the same file can land on different
devices. Maybe we need a cookie?
Either way this should be commented as right now it looks pretty
arbitrary.
next prev parent reply other threads:[~2021-10-14 16:08 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-13 16:54 [PATCHSET v2 0/9] Batched completions Jens Axboe
2021-10-13 16:54 ` [PATCH 1/9] block: define io_batch structure Jens Axboe
2021-10-14 5:45 ` Christoph Hellwig
2021-10-14 15:50 ` Jens Axboe
2021-10-14 16:06 ` Christoph Hellwig
2021-10-14 18:14 ` Jens Axboe
2021-10-13 16:54 ` [PATCH 2/9] block: add a struct io_batch argument to fops->iopoll() Jens Axboe
2021-10-13 16:54 ` [PATCH 3/9] sbitmap: add helper to clear a batch of tags Jens Axboe
2021-10-13 16:54 ` [PATCH 4/9] sbitmap: test bit before calling test_and_set_bit() Jens Axboe
2021-10-14 7:20 ` Hannes Reinecke
2021-10-14 13:01 ` Jens Axboe
2021-10-14 18:41 ` Bart Van Assche
2021-10-13 16:54 ` [PATCH 5/9] block: add support for blk_mq_end_request_batch() Jens Axboe
2021-10-14 7:32 ` Christoph Hellwig
2021-10-14 15:27 ` Jens Axboe
2021-10-13 16:54 ` [PATCH 6/9] nvme: add support for batched completion of polled IO Jens Axboe
2021-10-14 7:43 ` Christoph Hellwig
2021-10-14 15:30 ` Jens Axboe
2021-10-14 15:34 ` Jens Axboe
2021-10-14 16:07 ` Christoph Hellwig
2021-10-14 16:11 ` Jens Axboe
2021-10-13 16:54 ` [PATCH 7/9] block: assign batch completion handler in blk_poll() Jens Axboe
2021-10-14 7:48 ` Christoph Hellwig
2021-10-14 15:43 ` Jens Axboe
2021-10-13 16:54 ` [PATCH 8/9] io_uring: utilize the io_batch infrastructure for more efficient polled IO Jens Axboe
2021-10-14 8:03 ` Christoph Hellwig
2021-10-14 15:45 ` Jens Axboe
2021-10-14 16:08 ` Christoph Hellwig [this message]
2021-10-14 18:14 ` Jens Axboe
2021-10-16 4:29 ` Christoph Hellwig
2021-10-16 14:33 ` Jens Axboe
2021-10-13 16:54 ` [PATCH 9/9] nvme: wire up completion batching for the IRQ path Jens Axboe
2021-10-14 7:53 ` Christoph Hellwig
2021-10-14 15:49 ` Jens Axboe
-- strict thread matches above, loose matches on Subject: below --
2021-10-12 18:17 [PATCHSET 0/9] Batched completions Jens Axboe
2021-10-12 18:17 ` [PATCH 8/9] io_uring: utilize the io_batch infrastructure for more efficient polled IO Jens Axboe
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