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 F00752D3806; Mon, 5 May 2025 22:47:19 +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=1746485241; cv=none; b=H43kmUCslqyyhEmXkXZ+ZTCGkP9eb1wbuaQMa5A7kuqLpli6Z8DoxYATmEAtb2zAJQYm/AvM4UJ72Sn0EsuHni6ab9XPYyHS9/zMAjFBtpLVyhiIUq56PG/E8oyCtoqI1ymRsnW++xFC7RqnYw4BYThj2Z30D6Bub3E4l/paKBs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746485241; c=relaxed/simple; bh=ibdy/rtIaou04q3IrNpDo1noO5Avp/t2atPZu9N7z+M=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=QhL6eH/6ySicP2BhCYdPsby2FZaFbwFlz3J7EmLWZGUKk7dOZDPg2oxiWucaMs1T5Lk/J7pdSU5s3xehg8MJzok0h975Xbo4nAAsWS8IGo756W+h0GqH1g8sdmwgqAmfOBjxv7/vpcl86n/4xHNP82+KlVfU59hq3Z7sMRIXIPQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Omo0CiHW; 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="Omo0CiHW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id ED419C4CEE4; Mon, 5 May 2025 22:47:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746485239; bh=ibdy/rtIaou04q3IrNpDo1noO5Avp/t2atPZu9N7z+M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Omo0CiHWdBxm11fRMEf6gFqOBHMDylgYa6rhaWJ9M+PGVqOvkECYjm57KlYK+GLtj +0YdSaofWdy2xU8nVw4sOoF7GtSczxCBVFmKGcah93dGqEoKKNhCfu6SvsBF1+r2K1 Ep1DW17oepupKbLshB+lk5X8Pj3qskr37L7uuWxtY0X1w9bGxzHzMleHqeDCHxgiZ2 Xos53BNmxjz/B2UZdc2OWTjde94Nfc7u+lukcsTAwnjdoDdc08rvwaIg8OSdzjMeDk w3eGv7aORB5IzAwbEPT4vf1u6MwjsMfDj+gVU2J6uVIZ24EbNWHbMGB5m6Mi5hIGDF tVAa3D4KCBIeA== 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 6.12 229/486] soc: apple: rtkit: Use high prio work queue Date: Mon, 5 May 2025 18:35:05 -0400 Message-Id: <20250505223922.2682012-229-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250505223922.2682012-1-sashal@kernel.org> References: <20250505223922.2682012-1-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 6.12.26 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