public inbox for [email protected]
 help / color / mirror / Atom feed
From: Hao Xu <[email protected]>
To: Pavel Begunkov <[email protected]>, [email protected]
Cc: Jens Axboe <[email protected]>, [email protected]
Subject: Re: [PATCH 4/5] io_uring: add a helper for poll clean
Date: Sat, 7 May 2022 14:43:01 +0800	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

在 2022/5/7 上午12:22, Pavel Begunkov 写道:
> On 5/6/22 08:01, Hao Xu wrote:
>> From: Hao Xu <[email protected]>
>>
>> Add a helper for poll clean, it will be used in the multishot accept in
>> the later patches.
>>
>> Signed-off-by: Hao Xu <[email protected]>
>> ---
>>   fs/io_uring.c | 23 ++++++++++++++++++-----
>>   1 file changed, 18 insertions(+), 5 deletions(-)
>>
>> diff --git a/fs/io_uring.c b/fs/io_uring.c
>> index d33777575faf..0a83ecc457d1 100644
>> --- a/fs/io_uring.c
>> +++ b/fs/io_uring.c
>> @@ -5711,6 +5711,23 @@ static int io_accept_prep(struct io_kiocb *req, 
>> const struct io_uring_sqe *sqe)
>>       return 0;
>>   }
>> +static inline void __io_poll_clean(struct io_kiocb *req)
>> +{
>> +    struct io_ring_ctx *ctx = req->ctx;
>> +
>> +    io_poll_remove_entries(req);
>> +    spin_lock(&ctx->completion_lock);
>> +    hash_del(&req->hash_node);
>> +    spin_unlock(&ctx->completion_lock);
>> +}
>> +
>> +#define REQ_F_APOLL_MULTI_POLLED (REQ_F_APOLL_MULTISHOT | REQ_F_POLLED)
>> +static inline void io_poll_clean(struct io_kiocb *req)
>> +{
>> +    if ((req->flags & REQ_F_APOLL_MULTI_POLLED) == 
>> REQ_F_APOLL_MULTI_POLLED)
> 
> So it triggers for apoll multishot only when REQ_F_POLLED is _not_ set,
> but if it's not set it did never go through arm_poll / etc. and there is
> nothing to clean up. What is the catch?

No, it is triggered for apoll multishot only when REQ_F_POLLED is set..
> 
> btw, don't see the function used in this patch, better to add it later
> or at least mark with attribute unused, or some may get build failures.
Gotcha.
> 
> 
>> +        __io_poll_clean(req);
>> +}
>> +
>>   static int io_accept(struct io_kiocb *req, unsigned int issue_flags)
>>   {
>>       struct io_accept *accept = &req->accept;
>> @@ -6041,17 +6058,13 @@ static void io_poll_task_func(struct io_kiocb 
>> *req, bool *locked)
>>   static void io_apoll_task_func(struct io_kiocb *req, bool *locked)
>>   {
>> -    struct io_ring_ctx *ctx = req->ctx;
>>       int ret;
>>       ret = io_poll_check_events(req, locked);
>>       if (ret > 0)
>>           return;
>> -    io_poll_remove_entries(req);
>> -    spin_lock(&ctx->completion_lock);
>> -    hash_del(&req->hash_node);
>> -    spin_unlock(&ctx->completion_lock);
>> +    __io_poll_clean(req);
>>       if (!ret)
>>           io_req_task_submit(req, locked);
> 


  reply	other threads:[~2022-05-07  6:42 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-06  7:00 [PATCH v2 0/5] fast poll multishot mode Hao Xu
2022-05-06  7:00 ` [PATCH 1/5] io_uring: add IORING_ACCEPT_MULTISHOT for accept Hao Xu
2022-05-06 14:32   ` Jens Axboe
2022-05-07  4:05     ` Hao Xu
2022-05-06  7:00 ` [PATCH 2/5] io_uring: add REQ_F_APOLL_MULTISHOT for requests Hao Xu
2022-05-06  7:01 ` [PATCH 3/5] io_uring: let fast poll support multishot Hao Xu
2022-05-06 17:19   ` Pavel Begunkov
2022-05-06 22:02     ` Jens Axboe
2022-05-07  6:32       ` Hao Xu
2022-05-07  9:26       ` Pavel Begunkov
2022-05-07  7:08     ` Hao Xu
2022-05-07  9:47       ` Pavel Begunkov
2022-05-07 11:06         ` Hao Xu
2022-05-06 18:02   ` kernel test robot
2022-05-06  7:01 ` [PATCH 4/5] io_uring: add a helper for poll clean Hao Xu
2022-05-06 11:04   ` kernel test robot
2022-05-06 12:47   ` kernel test robot
2022-05-06 14:36   ` Jens Axboe
2022-05-07  6:37     ` Hao Xu
2022-05-06 16:22   ` Pavel Begunkov
2022-05-07  6:43     ` Hao Xu [this message]
2022-05-07  9:29       ` Pavel Begunkov
2022-05-06  7:01 ` [PATCH 5/5] io_uring: implement multishot mode for accept Hao Xu
2022-05-06 14:42   ` Jens Axboe
2022-05-07  9:13     ` Hao Xu
2022-05-06 20:50   ` Jens Axboe
2022-05-06 21:29     ` Jens Axboe
2022-05-06  7:36 ` [PATCH v2 0/5] fast poll multishot mode Hao Xu
2022-05-06 14:18   ` Jens Axboe
2022-05-06 16:01     ` Pavel Begunkov
2022-05-06 16:03       ` Jens Axboe
2022-05-06 22:23 ` Jens Axboe
2022-05-06 23:26   ` Jens Axboe
2022-05-07  2:33     ` Jens Axboe
2022-05-07  3:08       ` Jens Axboe
2022-05-07 16:01         ` Hao Xu

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 \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    [email protected] \
    /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