From 5916943943d19a854238d50d1fe2047467cbeb3c Mon Sep 17 00:00:00 2001
From: Pavel Begunkov <asml.silence@gmail.com>
Date: Wed, 24 Aug 2022 13:07:42 +0100
Subject: 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>
---
io_uring/opdef.h | 2 ++
1 file changed, 2 insertions(+)
(limited to 'io_uring/opdef.h')
diff --git a/io_uring/opdef.h b/io_uring/opdef.h
index ece8ed4f96c4..763c6e54e2ee 100644
--- a/io_uring/opdef.h
+++ b/io_uring/opdef.h
@@ -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;
--
cgit