From nobody Mon Feb 9 23:00:14 2026 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 E85792063FF; Sat, 22 Feb 2025 16:57:27 +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=1740243448; cv=none; b=JHqHaM32336y1qgCMUjbDvMkXsVMMexV5OT3+fhcIBFOBnr/kMELXnwbm2cQ216qroISEpwPKKaHISEjBOgy4BLNMwRwu/K8Wpv+xMx2IVGZrbECjtHz6J0ta3RNIjFfL5glYnStKlX63xeq18gRVx3fIosuV/RmS/Z23JLfsJQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740243448; c=relaxed/simple; bh=4E8KhD8x9nt6C1IAI/uulttC6xS9rKz68kPnusPtVyw=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=TqjWg7IRKnod05fmuyzUxwK3PmO3IUuv3i/SI6gQfvj7MITr9Omk4OeLPySS9I0SgnUy6REapzpuoTMZepB0/Gl6Ks2VA++HIq5JzA5k08UMBdvsTAA6y+2khAONaRPYSTV3gjcilt7sJMQ8yhvKr93s7BkmgnOJXo8Pd6+UyDE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=IR0MwCzv; 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="IR0MwCzv" Received: by smtp.kernel.org (Postfix) with ESMTPS id 8AD36C4CEE7; Sat, 22 Feb 2025 16:57:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1740243447; bh=4E8KhD8x9nt6C1IAI/uulttC6xS9rKz68kPnusPtVyw=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=IR0MwCzvfmIZL8eUiDV1QqMiWvmrCmjjJHl+6/xJmYkMIi6nq9Nf8o1RUQUUPn63/ sgncXMDTM7FbL7g3m6vD+2p+VZJH0Mm6iNft1QWpQTW8go3AAkJbCftw7rnMBh9JQM 2PiJZsoaRsGDN7mPGPn55oNUOrQ0TxTFVOfpFMJ8zdf8BVWTmnQnTRIwmSqHKMULHm RF5xfP0GCkhyOhAj/Sro6R3Mo6U56obAsb4CdbG6EEqiXdV37driDiRvOYGg7w44Ew df25mBlOuFwA4TWTr7RSXpVVWhvtOrEVvW4CE4EpPM1irwILkKR0knFQIb3ZCg9sC1 3OflukA2MQUvA== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 78667C021B9; Sat, 22 Feb 2025 16:57:27 +0000 (UTC) From: Sven Peter via B4 Relay Date: Sat, 22 Feb 2025 16:56:48 +0000 Subject: [PATCH 3/4] soc: apple: rtkit: Use high prio work queue Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250222-apple-soc-misc-v1-3-1a3af494a48a@svenpeter.dev> References: <20250222-apple-soc-misc-v1-0-1a3af494a48a@svenpeter.dev> In-Reply-To: <20250222-apple-soc-misc-v1-0-1a3af494a48a@svenpeter.dev> To: Alyssa Rosenzweig , Janne Grunau , Sven Peter Cc: asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1148; i=sven@svenpeter.dev; h=from:subject:message-id; bh=OWy6VUyG9jq3qBr8MjUz+I6ziXX4V7f2D7Wm55EGjV0=; b=owGbwMvMwCHmIlirolUq95LxtFoSQ/ouxs93H4hIZT5ne2ZQsWnBzGt3WbYyLkm8nxZQvHJJi 4DX/Au3O0pZGMQ4GGTFFFm277c3ffLwjeDSTZfew8xhZQIZwsDFKQAT4U1k+O/RLcbryXjg/Orw veyqdwO/i2vNv+2wa53plXtfVQ0ObVdg+J+Zu85u58aTu2T9ZL9N+uusLjtTvX2O1EY591X+ItO 5W1gA X-Developer-Key: i=sven@svenpeter.dev; a=openpgp; fpr=A1E3E34A2B3C820DBC4955E5993B08092F131F93 X-Endpoint-Received: by B4 Relay for sven@svenpeter.dev/default with auth_id=167 X-Original-From: Sven Peter Reply-To: sven@svenpeter.dev From: Janne Grunau 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 Signed-off-by: Sven Peter Reviewed-by: Alyssa Rosenzweig --- 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 35734ae8c9ce..b7f4654c3341 100644 --- a/drivers/soc/apple/rtkit.c +++ b/drivers/soc/apple/rtkit.c @@ -695,7 +695,7 @@ struct apple_rtkit *apple_rtkit_init(struct device *dev= , void *cookie, rtk->mbox->rx =3D apple_rtkit_rx; rtk->mbox->cookie =3D rtk; =20 - rtk->wq =3D alloc_ordered_workqueue("rtkit-%s", WQ_MEM_RECLAIM, + rtk->wq =3D alloc_ordered_workqueue("rtkit-%s", WQ_HIGHPRI | WQ_MEM_RECLA= IM, dev_name(rtk->dev)); if (!rtk->wq) { ret =3D -ENOMEM; --=20 2.34.1