From: Janne Grunau j@jannau.net
[ Upstream commit 22af2fac88fa5dbc310bfe7d0b66d4de3ac47305 ]
rtkit messages as communication with the DCP firmware for framebuffer swaps or input events are time critical so use WQ_HIGHPRI to prevent user space CPU load to increase latency. With kwin_wayland 6's explicit sync mode user space load was able to delay the IOMFB rtkit communication enough to miss vsync for surface swaps. Minimal test scenario is constantly resizing a glxgears Xwayland window.
Signed-off-by: Janne Grunau j@jannau.net Reviewed-by: Alyssa Rosenzweig alyssa@rosenzweig.io Link: https://lore.kernel.org/r/20250226-apple-soc-misc-v2-3-c3ec37f9021b@svenpete... Signed-off-by: Sven Peter sven@svenpeter.dev Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/soc/apple/rtkit.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/soc/apple/rtkit.c b/drivers/soc/apple/rtkit.c index d9f19dc99da5e..b9c5281c445ee 100644 --- a/drivers/soc/apple/rtkit.c +++ b/drivers/soc/apple/rtkit.c @@ -744,7 +744,7 @@ struct apple_rtkit *apple_rtkit_init(struct device *dev, void *cookie, rtk->mbox_cl.rx_callback = &apple_rtkit_rx; rtk->mbox_cl.tx_done = &apple_rtkit_tx_done;
- rtk->wq = alloc_ordered_workqueue("rtkit-%s", WQ_MEM_RECLAIM, + rtk->wq = alloc_ordered_workqueue("rtkit-%s", WQ_HIGHPRI | WQ_MEM_RECLAIM, dev_name(rtk->dev)); if (!rtk->wq) { ret = -ENOMEM;