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io_uring: conditional ->async_data allocation 

There are opcodes that need ->async_data only in some cases and
allocation it unconditionally may hurt performance. Add an option to
opdef to make move the allocation part from the core io_uring to opcode
specific code.
Note, we can't just set opdef->async_size to zero because there are
other helpers that rely on it, e.g. io_alloc_async_data().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/9dc62be9e88dd0ed63c48365340e8922d2498293.1661342812.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2022-08-24 13:07:42 +01:00 committed by Jens Axboe
parent 53bdc88aac
commit 5916943943
2 changed files with 6 additions and 3 deletions
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7
io_uring/io_uring.c
View File

@ -1450,9 +1450,10 @@ int io_req_prep_async(struct io_kiocb *req)
return 0;
if (WARN_ON_ONCE(req_has_async_data(req)))
return -EFAULT;
if (io_alloc_async_data(req))
return -EAGAIN;
if (!io_op_defs[req->opcode].manual_alloc) {
if (io_alloc_async_data(req))
return -EAGAIN;
}
return def->prep_async(req);
}

2
io_uring/opdef.h
View File

@ -25,6 +25,8 @@ struct io_op_def {
unsigned ioprio : 1;
/* supports iopoll */
unsigned iopoll : 1;
/* opcode specific path will handle ->async_data allocation if needed */
unsigned manual_alloc : 1;
/* size of async data needed, if any */
unsigned short async_size;