Re: [PATCH v3 0/3] next work propagation

[Pavel Begunkov <asml.silence@gmail.com>]

On 03/03/2020 21:33, Pavel Begunkov wrote:
> The next propagation bits are done similarly as it was before, but
> - nxt stealing is now at top-level, but not hidden in handlers
> - ensure there is no with REQ_F_DONT_STEAL_NEXT

Forgot to update this part, and also add, that there is no
refcount_dec_fetch(), so I did

io_put_req_async_completion() {
        refcount_dec()
        refcount_read()
}

because checks in refcount*() are useful, and I intend to remove
refcount_dec() with the optimisation patches.

> 
> v2:
> - fix race cond in io_put_req_submission()
> - don't REQ_F_DONT_STEAL_NEXT for sync poll_add
> 
> v3: [patch 3/3] only
> - drop DONT_STEAL approach, and just check for refcount==1
> 
> Pavel Begunkov (3):
>   io_uring: make submission ref putting consistent
>   io_uring: remove @nxt from handlers
>   io_uring: get next work with submission ref drop
> 
>  fs/io_uring.c | 307 +++++++++++++++++++++++---------------------------
>  1 file changed, 140 insertions(+), 167 deletions(-)
> 

-- 
Pavel Begunkov