From: Jens Axboe <axboe@kernel.dk>
To: Christoph Hellwig <hch@infradead.org>
Cc: io-uring@vger.kernel.org, linux-block@vger.kernel.org
Subject: Re: [PATCHSET v3 0/5] Enable bio recycling for polled IO
Date: Wed, 11 Aug 2021 09:05:47 -0600 [thread overview]
Message-ID: <c244becd-2d94-5b49-ed33-58e6456d91d9@kernel.dk> (raw)
In-Reply-To: <YROw06H0z0Js8yg3@infradead.org>
On 8/11/21 5:13 AM, Christoph Hellwig wrote:
> On Wed, Aug 11, 2021 at 09:26:33AM +0100, Christoph Hellwig wrote:
>> I really don't like all the layering violations in here. What is the
>> problem with a simple (optional) percpu cache in the bio_set? Something
>> like the completely untested patch below:
>
> A slightly updated version that actually compiles and survives minimal
> testing is here:
>
> http://git.infradead.org/users/hch/block.git/shortlog/refs/heads/bio-cache
I like this approach, I've done something very similar in the past. But
the key here is the opt-in, to avoid needing IRQ/locking for the cache
which defeats the purpose. That's why it was done just for polling,
obviously.
I'll test a bit and re-spin the series.
--
Jens Axboe
next prev parent reply other threads:[~2021-08-11 15:05 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-10 16:37 [PATCHSET v3 0/5] Enable bio recycling for polled IO Jens Axboe
2021-08-10 16:37 ` [PATCH 1/5] bio: add allocation cache abstraction Jens Axboe
2021-08-11 8:34 ` Christoph Hellwig
2021-08-10 16:37 ` [PATCH 2/5] io_uring: use kiocb->private to hold rw_len Jens Axboe
2021-08-11 11:40 ` Christoph Hellwig
2021-08-10 16:37 ` [PATCH 3/5] fs: add ki_bio_cache pointer to struct kiocb Jens Axboe
2021-08-10 16:37 ` [PATCH 4/5] io_uring: wire up bio allocation cache Jens Axboe
2021-08-10 16:37 ` [PATCH 5/5] block: enable use of " Jens Axboe
2021-08-10 16:44 ` [PATCHSET v3 0/5] Enable bio recycling for polled IO Jens Axboe
2021-08-11 8:26 ` Christoph Hellwig
2021-08-11 11:13 ` Christoph Hellwig
2021-08-11 15:05 ` Jens Axboe [this message]
2021-08-11 15:08 ` Christoph Hellwig
2021-08-11 15:06 ` Ming Lei
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