All of lore.kernel.org
 help / color / mirror / Atom feed
From: Ming Lei <ming.lei@redhat.com>
To: Jens Axboe <axboe@kernel.dk>
Cc: io-uring@vger.kernel.org, linux-block@vger.kernel.org
Subject: Re: [PATCH 1/4] bio: add allocation cache abstraction
Date: Tue, 10 Aug 2021 21:15:14 +0800	[thread overview]
Message-ID: <YRJ74uUkGfXjR52l@T590> (raw)
In-Reply-To: <20210809212401.19807-2-axboe@kernel.dk>

Hi Jens,

On Mon, Aug 09, 2021 at 03:23:58PM -0600, Jens Axboe wrote:
> Add a set of helpers that can encapsulate bio allocations, reusing them
> as needed. Caller must provide the necessary locking, if any is needed.
> The primary intended use case is polled IO from io_uring, which will not
> need any external locking.
> 
> Very simple - keeps a count of bio's in the cache, and maintains a max
> of 512 with a slack of 64. If we get above max + slack, we drop slack
> number of bio's.
> 
> The cache is intended to be per-task, and the user will need to supply
> the storage for it. As io_uring will be the only user right now, provide
> a hook that returns the cache there. Stub it out as NULL initially.

Is it possible for user space to submit & poll IO from different io_uring
tasks?

Then one bio may be allocated from bio cache of the submission task, and
freed to cache of the poll task?


Thanks, 
Ming


  reply	other threads:[~2021-08-10 13:15 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-09 21:23 [PATCHSET 0/4] Enable bio recycling for polled IO Jens Axboe
2021-08-09 21:23 ` [PATCH 1/4] bio: add allocation cache abstraction Jens Axboe
2021-08-10 13:15   ` Ming Lei [this message]
2021-08-10 13:53     ` Jens Axboe
2021-08-10 14:24       ` Jens Axboe
2021-08-10 14:48         ` Jens Axboe
2021-08-10 15:35           ` Jens Axboe
2021-08-10 15:54         ` Kanchan Joshi
2021-08-10 15:58           ` Jens Axboe
2021-08-09 21:23 ` [PATCH 2/4] fs: add bio alloc cache kiocb flag Jens Axboe
2021-08-09 21:24 ` [PATCH 3/4] io_uring: wire up bio allocation cache Jens Axboe
2021-08-10 12:25   ` Kanchan Joshi
2021-08-10 13:50     ` Jens Axboe
2021-08-09 21:24 ` [PATCH 4/4] block: enable use of " Jens Axboe
2021-08-10 12:39   ` Kanchan Joshi
2021-08-10 13:56     ` Jens Axboe

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=YRJ74uUkGfXjR52l@T590 \
    --to=ming.lei@redhat.com \
    --cc=axboe@kernel.dk \
    --cc=io-uring@vger.kernel.org \
    --cc=linux-block@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.