io_uring: keep SQ pointers in a single cacheline
sq_array and sq_sqes are always used together, however they are in
different cachelines, where the borderline is right before
cq_overflow_list is rather rarely touched. Move the fields together so
it loads only one cacheline.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/3ef2411a94874da06492506a8897eff679244f49.1623709150.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 3692bbc..8c501ee 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -364,6 +364,7 @@ struct io_ring_ctx {
* array.
*/
u32 *sq_array;
+ struct io_uring_sqe *sq_sqes;
unsigned cached_sq_head;
unsigned sq_entries;
unsigned sq_thread_idle;
@@ -373,8 +374,6 @@ struct io_ring_ctx {
struct list_head defer_list;
struct list_head timeout_list;
struct list_head cq_overflow_list;
-
- struct io_uring_sqe *sq_sqes;
} ____cacheline_aligned_in_smp;
struct {