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 D571A2FCA60; Mon, 5 May 2025 22:25:57 +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=1746483957; cv=none; b=lbMGxHO8z+5ZMrE+QF6JscLZhpAjqhFQjH1BIW9uZRuPJh8WeRyAgc3MkMg0eORGiWZeE4SGR36reLK4XaRzveOLLCNN+CrEON/ipbzeM3ciAe98eSTdiF+KrTfZsw16GOXs8UxcACxMJ+ywOxFnySDbbrhOabnIMaD4FJJay/w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746483957; c=relaxed/simple; bh=ibdy/rtIaou04q3IrNpDo1noO5Avp/t2atPZu9N7z+M=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=QPnKjLfDCERd5giqALhUy+M0SHyZzXcBW7YUDcBz0sMtU2pUY8Trp3OlSMm/Z8O5nAawgXJoQQfMDbl4/XoO861nR9KXca/tBNJTeyOjykUoOtiNNrYr7Tqq8R4X7QlXCSUmJb7wAh3p9BJGCzRc6RO8sRzplfpl26nyg2CJji4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qCTZsPnZ; 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="qCTZsPnZ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5F675C4CEEF; Mon, 5 May 2025 22:25:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746483957; bh=ibdy/rtIaou04q3IrNpDo1noO5Avp/t2atPZu9N7z+M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qCTZsPnZyaI0TQDf4PpQ2rvAJg9+mcoz9ebK0KvYAkU7U0jlKlO7G7YZaPXpS/oxI FuMI7D0cIV4FeQPi8/x/rV92lyIVdnRAuOEv1ipU2MpJ/coOQxyCwx0oblRo4cNaft AHjbxnVQ+QePcWzbpw+Z5zocafGQiiBQQBoLzxIc7fbAQE6bswTSHL/FF5Sc0QsRz2 QtPRQxqVvMlLSz03aU+7DB1uNpxcvUwGcDangHEudCEs7ImasE+3wLWzZfUaJKZ1ry HaW7b3kRWO3ZFxaBhXuBCiE1nefP2qEUEEhVqdfn6k7cJMsQZTYEbQAHiNgF+GuHET ygSBEHZZmH+Ng== 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 6.14 290/642] soc: apple: rtkit: Use high prio work queue Date: Mon, 5 May 2025 18:08:26 -0400 Message-Id: <20250505221419.2672473-290-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250505221419.2672473-1-sashal@kernel.org> References: <20250505221419.2672473-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.14.5 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 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