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From: Pavel Begunkov <asml.silence@gmail.com>
To: Hao Xu <haoxu@linux.alibaba.com>, Jens Axboe <axboe@kernel.dk>
Cc: io-uring@vger.kernel.org, Joseph Qi <joseph.qi@linux.alibaba.com>
Subject: Re: [PATCH 5/5] io_uring: leverage completion cache for poll requests
Date: Sun, 19 Sep 2021 13:04:10 +0100	[thread overview]
Message-ID: <166dc3e2-6eea-8354-ef12-07df49ec5aaf@gmail.com> (raw)
In-Reply-To: <2ab8efb5-7927-cf1a-a1af-f4955f7d94f6@linux.alibaba.com>

On 9/18/21 7:11 AM, Hao Xu wrote:
> 在 2021/9/18 上午4:39, Pavel Begunkov 写道:
>> On 9/17/21 8:38 PM, Hao Xu wrote:
>>> Leverage completion cache to handle completions of poll requests in a
>>> batch.
>>> Good thing is we save compl_nr - 1 completion_lock and
>>> io_cqring_ev_posted.
>>> Bad thing is compl_nr extra ifs in flush_completion.
>>
>> It does something really wrong breaking all abstractions, we can't go
>> with this. Can we have one of those below?
>> - __io_req_complete(issue_flags), forwarding issue_flags from above
>> - or maybe io_req_task_complete(), if we're in tw
> Make sense. we may need to remove io_clean_op logic in

> io_req_complete_state(), multishot reqs shouldn't do it, and it's ok for
> normal reqs since we do it later in __io_submit_flush_completions->
> io_req_free_batch->io_dismantle_req->io_clean_op, correct me if I'm
> wrong.

req->compl.cflags is in the first 64B, i.e. aliased with req->rw and
others. We need to clean everything left in there before using the
space, that's what io_clean_op() there is for

-- 
Pavel Begunkov

  reply	other threads:[~2021-09-19 12:04 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-17 19:38 [RFC 0/5] " Hao Xu
2021-09-17 19:38 ` [PATCH 1/5] io_uring: return boolean value for io_alloc_async_data Hao Xu
2021-09-17 19:38 ` [PATCH 2/5] io_uring: code clean for io_poll_complete() Hao Xu
2021-09-17 19:38 ` [PATCH 3/5] io_uring: fix race between poll completion and cancel_hash insertion Hao Xu
2021-09-17 19:38 ` [PATCH 4/5] io_uring: fix lacking of EPOLLONESHOT Hao Xu
2021-09-17 19:38 ` [PATCH 5/5] io_uring: leverage completion cache for poll requests Hao Xu
2021-09-17 19:51   ` Hao Xu
2021-09-17 20:39   ` Pavel Begunkov
2021-09-18  6:11     ` Hao Xu
2021-09-19 12:04       ` Pavel Begunkov [this message]
2021-09-19 15:52         ` Hao Xu
2021-09-19 16:10           ` Hao Xu
2021-09-17 20:28 ` [RFC 0/5] " Pavel Begunkov

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