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io_uring: optimise ctx flags layout

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There may be different cost for reeading just one byte or more, so it's
benificial to keep ctx flag bits that we access together in a single
byte. That affected code generation of __io_cq_unlock_post_flush() and
removed one memory load.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/bbe8ca4705704690319d65e45845f9fc9d35f420.1673887636.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2023-01-16 16:49:00 +00:00 committed by Jens Axboe
parent 31f084b7b0
commit 632ffe0956
1 changed files with 3 additions and 3 deletions
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6
include/linux/io_uring_types.h
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@ -196,17 +196,17 @@ struct io_ring_ctx {
/* const or read-mostly hot data */
struct {
unsigned int flags;
unsigned int compat: 1;
unsigned int drain_next: 1;
unsigned int restricted: 1;
unsigned int off_timeout_used: 1;
unsigned int drain_active: 1;
unsigned int drain_disabled: 1;
unsigned int has_evfd: 1;
unsigned int syscall_iopoll: 1;
/* all CQEs should be posted only by the submitter task */
unsigned int task_complete: 1;
unsigned int syscall_iopoll: 1;
unsigned int poll_activated: 1;
unsigned int drain_disabled: 1;
unsigned int compat: 1;
enum task_work_notify_mode notify_method;
struct io_rings *rings;