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From: Jens Axboe <axboe@kernel.dk>
To: "Pavel Begunkov (Silence)" <asml.silence@gmail.com>,
	Ingo Molnar <mingo@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 0/2] Optimise io_uring completion waiting
Date: Fri, 13 Sep 2019 18:31:11 -0600
Message-ID: <af5ba045-2ea8-b213-3625-354c10334540@kernel.dk> (raw)
In-Reply-To: <cover.1568413210.git.asml.silence@gmail.com>

On 9/13/19 4:28 PM, Pavel Begunkov (Silence) wrote:
> From: Pavel Begunkov <asml.silence@gmail.com>
> 
> There could be a lot of overhead within generic wait_event_*() used for
> waiting for large number of completions. The patchset removes much of
> it by using custom wait event (wait_threshold).
> 
> Synthetic test showed ~40% performance boost. (see patch 2)

Nifty, from an io_uring perspective, I like this a lot.

The core changes needed to support it look fine as well. I'll await
Peter/Ingo's comments on it.

-- 
Jens Axboe


  parent reply index

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-13 22:28 Pavel Begunkov (Silence)
2019-09-13 22:28 ` [RFC PATCH 1/2] sched/wait: Add wait_threshold Pavel Begunkov (Silence)
2019-09-13 22:28 ` [RFC PATCH 2/2] io_uring: Optimise cq waiting with wait_threshold Pavel Begunkov (Silence)
2019-09-14  0:31 ` Jens Axboe [this message]
2019-09-14 10:11   ` [RFC PATCH 0/2] Optimise io_uring completion waiting Pavel Begunkov

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