From: Christoph Hellwig <hch@infradead.org>
To: Jianchao Wang <jianchao.w.wang@oracle.com>
Cc: axboe@kernel.dk, viro@zeniv.linux.org.uk,
linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH V2] io_uring: introduce inline reqs for IORING_SETUP_IOPOLL
Date: Tue, 9 Apr 2019 02:37:17 -0700 [thread overview]
Message-ID: <20190409093717.GA15391@infradead.org> (raw)
In-Reply-To: <1554787314-27179-1-git-send-email-jianchao.w.wang@oracle.com>
On Tue, Apr 09, 2019 at 01:21:54PM +0800, Jianchao Wang wrote:
> For the IORING_SETUP_IOPOLL case, all of the submission and
> completion are handled under ctx->uring_lock or in SQ poll thread
> context, so io_get_req and io_put_req has been serialized well.
> The only exception is the asynchronous workqueue context where could
> free the io_kiocb for error. To overcome this, we allocate a new
> io_kiocb and free the previous inlined one.
>
> Based on this, we introduce the preallocated reqs list per ctx and
> needn't to provide any lock to serialize the updating of list. The
> performacne benefits from this. The test result of following fio
> command
I really don't like the idea of exposing this to userspace. Is
there any good reason to not simply always allocate inline request
up to a certain ring size?
next prev parent reply other threads:[~2019-04-09 9:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-09 5:21 [PATCH V2] io_uring: introduce inline reqs for IORING_SETUP_IOPOLL Jianchao Wang
2019-04-09 9:37 ` Christoph Hellwig [this message]
2019-04-09 9:43 ` Christoph Hellwig
2019-04-09 9:46 ` jianchao.wang
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=20190409093717.GA15391@infradead.org \
--to=hch@infradead.org \
--cc=axboe@kernel.dk \
--cc=jianchao.w.wang@oracle.com \
--cc=linux-block@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=viro@zeniv.linux.org.uk \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).