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soc: apple: rtkit: Use high prio work queue

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[ 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@svenpeter.dev
Signed-off-by: Sven Peter <sven@svenpeter.dev>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Janne Grunau
2025-02-26 19:00:05 +00:00
committed by Greg Kroah-Hartman
parent 1ae981c91d
commit 78b6b2fe17
1 changed files with 1 additions and 1 deletions
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2
drivers/soc/apple/rtkit.c
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@@ -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;