From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 265EA3839C7; Mon, 5 May 2025 23:09:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746486596; cv=none; b=l3RzC20ItiOVH11wjB+dyomKMijK5o3N5Y1yXsSRj73JObeEgBi5n2Fck7d8ZsnBtGWLDSABF/P6nyskktVqRz1NNudZ2OW+KmnraqV0Lt+fxSI8m+jtj20dtd6llbKU7a1kpX26J5WZw2AtNtGvsaDczmwRnjBhlUQCDr8Oc1Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746486596; c=relaxed/simple; bh=aC4Ryb65PUyUcR1wICxIFf/qC97GYtcMuJPDYJvv43s=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=jo4eQQ0jD1qdIfxgl3LXp40CNZio1Ttsdv/vxiKQtGIjJrt494YsVPLXj0z6CXU+fQFZhQ5Di8M29cH52eX0hAs+HpPJRnT8Jydm/xj/vm75nxeb0ZMQlNPRctrK85vTqx6hrS952mfRmO5cFzUNGKMOYb2hrIx8/7snjjEaeMc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PRy00zuz; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="PRy00zuz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1CE44C4CEF1; Mon, 5 May 2025 23:09:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746486595; bh=aC4Ryb65PUyUcR1wICxIFf/qC97GYtcMuJPDYJvv43s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PRy00zuz1OT0enbdh6S/02IpMfXM6AWBVwh0A/0NzT1IZEJejLgwDb80p1HSdKI7u 8NVwCVaPtgLlR0GXhFe9vWlU6mAP7WkEJVkeZlI1nxOlGbx/2eJIl9AOTjTVSu7r3G 0Wx0fK7YjybojS8aTcY1PShE5DmEXSFa7ZnXVmjWpdZaZZvvT52b7je7T4xUVWgzzJ rWpiLksQUG9I7gQd6ryk52tbf6jO5jBV6SNf2N9w1JbPCH/hTG2J28u5aWYEoTUXgZ 4fFeJRkW8/9kgmSvorjMSdlyi4zxvB3dnJYdzrQujbMLa6fGVetUAgmXO3FJ3Yb2oi nJDi4uLR4KLeA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Janne Grunau , Alyssa Rosenzweig , Sven Peter , Sasha Levin , asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org Subject: [PATCH AUTOSEL 6.1 108/212] soc: apple: rtkit: Use high prio work queue Date: Mon, 5 May 2025 19:04:40 -0400 Message-Id: <20250505230624.2692522-108-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250505230624.2692522-1-sashal@kernel.org> References: <20250505230624.2692522-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.1.136 Content-Transfer-Encoding: 8bit From: Janne Grunau [ 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 Reviewed-by: Alyssa Rosenzweig Link: https://lore.kernel.org/r/20250226-apple-soc-misc-v2-3-c3ec37f9021b@svenpeter.dev Signed-off-by: Sven Peter Signed-off-by: Sasha Levin --- 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 8ec74d7539eb4..1ec0c3ba0be22 100644 --- a/drivers/soc/apple/rtkit.c +++ b/drivers/soc/apple/rtkit.c @@ -731,7 +731,7 @@ static 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; -- 2.39.5