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From: Pavel Begunkov <[email protected]>
To: Jens Axboe <[email protected]>,
	[email protected], [email protected]
Subject: Re: [PATCH 0/3] io_uring: clean wq path
Date: Thu, 6 Feb 2020 01:29:16 +0300	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>


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On 05/02/2020 22:07, Pavel Begunkov wrote:
> This is the first series of shaving some overhead for wq-offloading.
> The 1st removes extra allocations, and the 3rd req->refs abusing.

Rechecked a couple of assumptions, this patchset is messed up.
Drop it for now.

> There are plenty of opportunities to leak memory similarly to
> the way mentioned in [PATCH 1/3], and I'm working a generic fix,
> as I need it to close holes in waiting splice(2) patches.
> 
> The untold idea behind [PATCH 3/3] is to get rid referencing even
> further. As submission ref always pin request, there is no need
> in the second (i.e. completion) ref. Even more, With a bit of
> retossing, we can get rid of req->refs at all by using non-atomic
> ref under @compl_lock, which usually will be bundled fill_event().
> I'll play with it soon. Any ideas or concerns regarding it?
> 
> Regarding [PATCH 3/3], is there better way to do it for io_poll_add()?
> 
> 
> Pavel Begunkov (3):
>   io_uring: pass sqe for link head
>   io_uring: deduce force_nonblock in io_issue_sqe()
>   io_uring: pass submission ref to async
> 
>  fs/io_uring.c | 60 +++++++++++++++++++++++++++++----------------------
>  1 file changed, 34 insertions(+), 26 deletions(-)
> 

-- 
Pavel Begunkov


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  parent reply	other threads:[~2020-02-05 22:30 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-05 19:07 [PATCH 0/3] io_uring: clean wq path Pavel Begunkov
2020-02-05 19:07 ` [PATCH 1/3] io_uring: pass sqe for link head Pavel Begunkov
2020-02-05 21:39   ` Pavel Begunkov
2020-02-05 21:43     ` Pavel Begunkov
2020-02-05 19:07 ` [PATCH 2/3] io_uring: deduce force_nonblock in io_issue_sqe() Pavel Begunkov
2020-02-05 19:07 ` [PATCH 3/3] io_uring: pass submission ref to async Pavel Begunkov
2020-02-05 22:29 ` Pavel Begunkov [this message]
2020-02-06  2:50   ` [PATCH 0/3] io_uring: clean wq path Jens Axboe
2020-02-06  9:51     ` Pavel Begunkov
2020-02-06 14:26       ` Jens Axboe

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