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Message-Id: <20250505223922.2682012-229-sashal@kernel.org>
Date: Mon, 5 May 2025 18:35:05 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
stable@...r.kernel.org
Cc: Janne Grunau <j@...nau.net>,
Alyssa Rosenzweig <alyssa@...enzweig.io>,
Sven Peter <sven@...npeter.dev>,
Sasha Levin <sashal@...nel.org>,
asahi@...ts.linux.dev,
linux-arm-kernel@...ts.infradead.org
Subject: [PATCH AUTOSEL 6.12 229/486] soc: apple: rtkit: Use high prio work queue
From: Janne Grunau <j@...nau.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@...nau.net>
Reviewed-by: Alyssa Rosenzweig <alyssa@...enzweig.io>
Link: https://lore.kernel.org/r/20250226-apple-soc-misc-v2-3-c3ec37f9021b@svenpeter.dev
Signed-off-by: Sven Peter <sven@...npeter.dev>
Signed-off-by: Sasha Levin <sashal@...nel.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 e6d940292c9fb..00d59a81db88b 100644
--- a/drivers/soc/apple/rtkit.c
+++ b/drivers/soc/apple/rtkit.c
@@ -667,7 +667,7 @@ struct apple_rtkit *apple_rtkit_init(struct device *dev, void *cookie,
rtk->mbox->rx = apple_rtkit_rx;
rtk->mbox->cookie = rtk;
- 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;
--
2.39.5
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