From nobody Mon Feb 9 09:38:24 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 39F19238D50; Wed, 26 Feb 2025 19:00:16 +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=1740596417; cv=none; b=SqRIG7xFN0v5GVrjLJJ5EKVTtXmmki3l6vknxAAgxfS2EhXeL9a+UqGKCpCUIqqkvUMmbA9DmNxQlvCQ5X/dVt/KDMbnjmGiKEbNOnWFr+QkwEtQnpqXbjaUaHEyIxuRxRDR2NNc1JlsffAmvPDhow7+QJno5C62B5C2Aa2lZTY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740596417; c=relaxed/simple; bh=efHDZc+VZMO22pyTz8bbQ9t4hJW8gBFp6rwM21UYaFs=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Tm7fR499AuBo+jhAai/ldKaXtKhJxPjzrpjqgLMeAF+QUyfviUwSdL7cI0UEGDMPEcIR3kDHzkkNd8Cri1aSFsS9vgAd5qvZenG5qQgv7T87FliCGmnJDuSWezk/T15uhVlxRgmjOYFFpVbfW7r9/oDB9YY61ZtD1YTsEj3PcBQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=EU9j0MnR; 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="EU9j0MnR" Received: by smtp.kernel.org (Postfix) with ESMTPS id D0313C4CEE9; Wed, 26 Feb 2025 19:00:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1740596416; bh=efHDZc+VZMO22pyTz8bbQ9t4hJW8gBFp6rwM21UYaFs=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=EU9j0MnRwNITYvf2vonhEdW+AF/04yg+zg83Laf8oCZOio0b3At/PjT12zGaunr/Z zojBhs71rA9JH1hn4TXzI/vWIKoHZ0Ojaftr36PxqV1JxyY7zfbWB/0M27f5C6yHhW DItVmuXkrOJwPvwyaEyvjXFhLFQu0E8MxngF4++2EznzWdzonwiLu6Ae8UfX5ToSY0 zX3q9N4hmWJiluYsETNGD/ls5zckpYgHdHln+FYGZwsABsxZ92lY+EsDPleHedbrg9 9GJhyKGlXKkIbMlBXbmYFKzJ8im1AJhdoiGAgBhrgfBwVU4nUniuCZivUoVeP1IJX6 eL8xlmxogW0BA== 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 C1CFFC19F2E; Wed, 26 Feb 2025 19:00:16 +0000 (UTC) From: Sven Peter via B4 Relay Date: Wed, 26 Feb 2025 19:00:05 +0000 Subject: [PATCH v2 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: <20250226-apple-soc-misc-v2-3-c3ec37f9021b@svenpeter.dev> References: <20250226-apple-soc-misc-v2-0-c3ec37f9021b@svenpeter.dev> In-Reply-To: <20250226-apple-soc-misc-v2-0-c3ec37f9021b@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=1203; i=sven@svenpeter.dev; h=from:subject:message-id; bh=iv/ffBDDwqiEAfuhFDw9qjf225eWoJ8zsBxA5fDCkeQ=; b=owGbwMvMwCHmIlirolUq95LxtFoSQ/r+lL3ym1uNXD12Pz7lKsp732r7wsbyZdIKzy6Lftwfw eaf9uddRykLgxgHg6yYIsv2/famTx6+EVy66dJ7mDmsTCBDGLg4BWAiC7sY/vD822NWt4O9RlY2 wcvXTDr+S7PNTd2k+712/2q0l3nUpjD8FT3rNT9ZiCOGR6NbYEdr/lO/0+uE3L93uGoteFP0XU2 VEwA= 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 Reviewed-by: Alyssa Rosenzweig Signed-off-by: Sven Peter --- 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 7e7b4f64ab17..4b78463dd5a1 100644 --- a/drivers/soc/apple/rtkit.c +++ b/drivers/soc/apple/rtkit.c @@ -696,7 +696,7 @@ 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