From nobody Tue Dec 16 22:15:45 2025 Received: from mail-pj1-f68.google.com (mail-pj1-f68.google.com [209.85.216.68]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 089DD17FAB1; Thu, 30 May 2024 11:20:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.68 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717068012; cv=none; b=Lvmw914NkPo379tYy3t/WsyNxBAbE8XU9r2Yh9aB4KObdYu3beASgscn7NDKx+a88O3O0TYBIGftOZmz/OTtInAitOY9FfYVsxc7GGtu/+HGcP6YkTW0R66JjZF+JaFIBg3ApMrYFTQfl63GSeKVhCo+GWoAXYfVL5e5+78K4gc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717068012; c=relaxed/simple; bh=h4glHeoHIj1lCrO/9cfcaGCSQbc7rI3O4B300cL/OlA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VgNdXZCwSLqJiIDMC7OC4/zqBUoAy/0Yvxlnq2GZiztbAmvFdeqmPZMOB+Ws9pE/t2M790MzqLjBe4mOWYCz58SZp9AVoNYpZG5n2+So8jj3In76xqlva+2GI/ojTm8RMdjzXOsyCRG1qHfTO6WeZiDkr58QSZkgnu2HgeB2Fbk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=Let0hHlB; arc=none smtp.client-ip=209.85.216.68 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Let0hHlB" Received: by mail-pj1-f68.google.com with SMTP id 98e67ed59e1d1-2b9702e05easo567360a91.1; Thu, 30 May 2024 04:20:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1717068010; x=1717672810; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=UKDbsptHUOf10z9ycdwLPkvcPnlZIVKylvaMWlEqffg=; b=Let0hHlBBdRiZl1HOYO00Iygkx7PhYJ7iepve126di3HcJccBPoyk8sNdpLNPHFm+/ YTKrz4hrG7E5vb7Dm6O5jBxb5x8bcecg5ikNxtMvYE7Num2RUENXfEmIm0CxMycU4oa8 p6az3UVYWNXxKaAvWsfr+fbu/rl+xPPbNke6vuoVMTERz/MVTOQpWp/wQZvOBPKwXzP6 KT5881Cto7BvwyRFdUxwmEsN3wEL/ZG8OVrNKMt0Prc0CuQU9Y8dqvnLX4h/fbaKBpQR TIy506TJYOhSJFHw4kWL4CeweniEVvAcCNBJjAsiEIGbmTFb0i2B/eHAabT4fDqZFUUA yCRA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1717068010; x=1717672810; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=UKDbsptHUOf10z9ycdwLPkvcPnlZIVKylvaMWlEqffg=; b=wPO5FzaExngm6wpiIkDpSiMzokx0Xft4sWrF7KhkOPf43HR8bhY48SbNyL9UmSiPKm 2fQuU2KQSAcGH6qVlcp/wEpU6tiGKmw/vSMF/aOlnavW7id9maesqgeF7d5oscCc0/7I svMjy0WXH2wkxR0UvjQT5ovAJOPpoP2CEV+jPoqS+qZA8ae/87PbVmoiFMVFOgfKtG8V p3ALjxSr9aqmP0SmE02sqGJlyYsMZtjfUSc/vautWulJHJtTY4jYCTQa379bdAoFmN2F KqmTEy0ISeBK5+xN/MquQFwDOokVEAPoVOY7RO1m0b64gaO3r7zpaxUxUzCcF1gcSKsu p4hQ== X-Forwarded-Encrypted: i=1; AJvYcCVIRwcyyqXYxiLzQcwnW8U1llTJxjwIC2oao+JtP1uYylXWIqHVayLqgJhNAvqT7bkNh/h0qAh5xs8RzB3i2ocfF1avC/Co5SKGp6nU5Xk9QK5CryHZ6168bnrPHzC0hQVx3Z0DYmRP8jkurz4wCo4bh5EJSgxTXrmqSK/OFNFndwaVL2esH6bOR2VS7epK4PebZaDyBU2DkN2zLMgA8xTj0gw1oaXmdaRQ9W1NbM+paGVDFqhp9vMrpNcoF2muZJxET1e/DQHV5z3t+5kp89Dg X-Gm-Message-State: AOJu0YyiRhcILucFdHIwVi8NcEBbJ3KBdLr0UpoRWOSGYl0TmNSaCLNQ 2HING/Zvwcb6LU5KEfkTfnC+4R41vX+KmBPw8XadRtpXaBkdqVW6 X-Google-Smtp-Source: AGHT+IG8jDyJ8as1gn+77mY1eHAg+/C0hnh88tNUqGm5hMTpX2IBrtY6RK5OpQr2kS5B3uzx1FXS4g== X-Received: by 2002:a17:90a:b005:b0:2bd:f3dc:62d0 with SMTP id 98e67ed59e1d1-2c1abc41427mr1745172a91.37.1717068010054; Thu, 30 May 2024 04:20:10 -0700 (PDT) Received: from localhost ([212.107.28.52]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2c1a777a976sm1534201a91.20.2024.05.30.04.20.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 May 2024 04:20:09 -0700 (PDT) From: Celeste Liu X-Google-Original-From: Celeste Liu To: Heinrich Schuchardt , Anup Patel , Guo Ren , Palmer Dabbelt , Paul Walmsley , Huacai Chen , WANG Xuerui , Thomas Bogendoerfer , Vladimir Kondratiev , Gregory CLEMENT , =?UTF-8?q?Th=C3=A9o=20Lebrun?= , Michael Ellerman , Nicholas Piggin , Christophe Leroy , "Naveen N . Rao" , Sven Joachim , Yoshinori Sato , Rich Felker , John Paul Adrian Glaubitz , Russell King , Florian Fainelli , Ray Jui , Scott Branden , Broadcom internal kernel review list , Tony Lindgren , Thierry Reding , Jonathan Hunter , Arnd Bergmann , Mykola Lysenko , linux-riscv@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-rpi-kernel@lists.infradead.org, linux-omap@vger.kernel.org, linux-tegra@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-sh@vger.kernel.org Cc: linux-kselftest@vger.kernel.org, bpf@vger.kernel.org, linux-kernel@vger.kernel.org, Lennart Poettering , Icenowy Zheng , Celeste Liu Subject: [PATCH 2/6] loongarch: defconfig: drop RT_GROUP_SCHED=y Date: Thu, 30 May 2024 19:19:50 +0800 Message-ID: <20240530111947.549474-10-CoelacanthusHex@gmail.com> X-Mailer: git-send-email 2.45.1 In-Reply-To: <20240530111947.549474-8-CoelacanthusHex@gmail.com> References: <20240530111947.549474-8-CoelacanthusHex@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1629; i=CoelacanthusHex@gmail.com; h=from:subject; bh=h4glHeoHIj1lCrO/9cfcaGCSQbc7rI3O4B300cL/OlA=; b=owJ4nJvAy8zAJfY4pvNJRPo6U8bTakkMaREJ1/n69Xxaeu7NP36NP963pkB213cGx83nk+e+3 76w6tID+4kdpSwMYlwMsmKKLGI7n75eVvrowzJekxkwc1iZQIYwcHEKwESKNRn+WU/3fra1weNu krm/TiCjVtvfa8brLyYvXBxW9+bE9hjTBwx/hWUiri0SdmdLcHzGfvl11UovoVVOsWVy29fF/F/ 2874CBwCfBE2n X-Developer-Key: i=CoelacanthusHex@gmail.com; a=openpgp; fpr=892EBC7DC392DFF9C9C03F1D15F4180E73787863 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" For cgroup v1, if turned on, and there's any cgroup in the "cpu" hierarchy = it needs an RT budget assigned, otherwise the processes in it will not be able= to get RT at all. The problem with RT group scheduling is that it requires the budget assigned but there's no way we could assign a default budget, since = the values to assign are both upper and lower time limits, are absolute, and ne= ed to be sum up to < 1 for each individal cgroup. That means we cannot really com= e up with values that would work by default in the general case.[1] For cgroup v2, it's almost unusable as well. If it turned on, the cpu contr= oller can only be enabled when all RT processes are in the root cgroup. But it wi= ll lose the benefits of cgroup v2 if all RT process were placed in the same cg= roup. Red Hat, Gentoo, Arch Linux and Debian all disable it. systemd also doesn't support it.[2] [1]: https://bugzilla.redhat.com/show_bug.cgi?id=3D1229700 [2]: https://github.com/systemd/systemd/issues/13781#issuecomment-549164383 Signed-off-by: Celeste Liu Reviewed-by: Xi Ruoyao --- arch/loongarch/configs/loongson3_defconfig | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/loongarch/configs/loongson3_defconfig b/arch/loongarch/co= nfigs/loongson3_defconfig index b4252c357c8e..4d93adb3f1a2 100644 --- a/arch/loongarch/configs/loongson3_defconfig +++ b/arch/loongarch/configs/loongson3_defconfig @@ -23,7 +23,6 @@ CONFIG_NUMA_BALANCING=3Dy CONFIG_MEMCG=3Dy CONFIG_BLK_CGROUP=3Dy CONFIG_CFS_BANDWIDTH=3Dy -CONFIG_RT_GROUP_SCHED=3Dy CONFIG_CGROUP_PIDS=3Dy CONFIG_CGROUP_RDMA=3Dy CONFIG_CGROUP_FREEZER=3Dy --=20 2.45.1