struct ublk_io is already 56 bytes on 64-bit architectures, so round it
up to a full cache line (typically 64 bytes). This ensures a single
ublk_io doesn't span multiple cache lines and prevents false sharing if
consecutive ublk_io's are accessed by different daemon tasks.
Signed-off-by: Caleb Sander Mateos <csander@xxxxxxxxxxxxxxx>
---
drivers/block/ublk_drv.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
index ebc56681eb68..740141c63a93 100644
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -186,11 +186,11 @@ struct ublk_io {
unsigned task_registered_buffers;
/* auto-registered buffer, valid if UBLK_IO_FLAG_AUTO_BUF_REG is set */
u16 buf_index;
void *buf_ctx_handle;
-};
+} ____cacheline_aligned_in_smp;
struct ublk_queue {
int q_id;
int q_depth;
--
2.45.2
