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From: Pavel Begunkov <[email protected]>
To: Hao Xu <[email protected]>, Jens Axboe <[email protected]>,
	[email protected]
Subject: Re: [PATCH v2 10/24] io_uring: add a helper for batch free
Date: Tue, 28 Sep 2021 10:33:36 +0100	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

On 9/26/21 4:36 AM, Hao Xu wrote:
> 在 2021/9/25 上午4:59, Pavel Begunkov 写道:
>> Add a helper io_free_batch_list(), which takes a single linked list and
>> puts/frees all requests from it in an efficient manner. Will be reused
>> later.
>>
>> Signed-off-by: Pavel Begunkov <[email protected]>
>> ---
>>   fs/io_uring.c | 34 +++++++++++++++++++++-------------
>>   1 file changed, 21 insertions(+), 13 deletions(-)
>>
>> diff --git a/fs/io_uring.c b/fs/io_uring.c
>> index 205127394649..ad8af05af4bc 100644
>> --- a/fs/io_uring.c
>> +++ b/fs/io_uring.c
>> @@ -2308,12 +2308,31 @@ static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req,
>>       wq_stack_add_head(&req->comp_list, &state->free_list);
>>   }
>>   +static void io_free_batch_list(struct io_ring_ctx *ctx,
>> +                   struct io_wq_work_list *list)
>> +    __must_hold(&ctx->uring_lock)
>> +{
>> +    struct io_wq_work_node *node;
>> +    struct req_batch rb;
>> +
>> +    io_init_req_batch(&rb);
>> +    node = list->first;
>> +    do {
>> +        struct io_kiocb *req = container_of(node, struct io_kiocb,
>> +                            comp_list);
>> +
>> +        node = req->comp_list.next;
>> +        if (req_ref_put_and_test(req))
>> +            io_req_free_batch(&rb, req, &ctx->submit_state);
>> +    } while (node);
>> +    io_req_free_batch_finish(ctx, &rb);
>> +}
> Hi Pavel, Why not we use the wq_list_for_each here as well?

Because we do wq_stack_add_head() in the middle of the loop and
there is also refcounting adding potential races. We'd need
some for_each_*_safe version of it.


-- 
Pavel Begunkov

  reply	other threads:[~2021-09-28  9:34 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-24 20:59 [PATCH v2 00/24] rework and optimise submission+completion paths Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 01/24] io_uring: mark having different creds unlikely Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 02/24] io_uring: force_nonspin Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 03/24] io_uring: make io_do_iopoll return number of reqs Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 04/24] io_uring: use slist for completion batching Pavel Begunkov
2021-09-26  6:57   ` Hao Xu
2021-09-28  9:41     ` Pavel Begunkov
2021-09-28 15:32       ` Jens Axboe
2021-09-24 20:59 ` [PATCH v2 05/24] io_uring: remove allocation cache array Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 06/24] io-wq: add io_wq_work_node based stack Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 07/24] io_uring: replace list with stack for req caches Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 08/24] io_uring: split iopoll loop Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 09/24] io_uring: use single linked list for iopoll Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 10/24] io_uring: add a helper for batch free Pavel Begunkov
2021-09-26  3:36   ` Hao Xu
2021-09-28  9:33     ` Pavel Begunkov [this message]
2021-09-24 20:59 ` [PATCH v2 11/24] io_uring: convert iopoll_completed to store_release Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 12/24] io_uring: optimise batch completion Pavel Begunkov
     [not found]   ` <CAFUsyfLSXMvd_MBAp83qriW7LD=bg2=25TC4e_X4oMO1atoPYg@mail.gmail.com>
2021-09-28  9:35     ` Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 13/24] io_uring: inline completion batching helpers Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 14/24] io_uring: don't pass tail into io_free_batch_list Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 15/24] io_uring: don't pass state to io_submit_state_end Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 16/24] io_uring: deduplicate io_queue_sqe() call sites Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 17/24] io_uring: remove drain_active check from hot path Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 18/24] io_uring: split slow path from io_queue_sqe Pavel Begunkov
2021-09-24 20:59 ` [PATCH v2 19/24] io_uring: inline hot path of __io_queue_sqe() Pavel Begunkov
2021-09-24 21:00 ` [PATCH v2 20/24] io_uring: reshuffle queue_sqe completion handling Pavel Begunkov
2021-09-24 21:00 ` [PATCH v2 21/24] io_uring: restructure submit sqes to_submit checks Pavel Begunkov
2021-09-24 21:00 ` [PATCH v2 22/24] io_uring: kill off ->inflight_entry field Pavel Begunkov
2021-09-24 21:00 ` [PATCH v2 23/24] io_uring: comment why inline complete calls io_clean_op() Pavel Begunkov
2021-09-24 21:00 ` [PATCH v2 24/24] io_uring: disable draining earlier Pavel Begunkov
2021-09-30 16:04 ` [PATCH v2 00/24] rework and optimise submission+completion paths Jens Axboe

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