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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 1/6] riscv: defconfig: drop RT_GROUP_SCHED=y Date: Thu, 30 May 2024 19:19:49 +0800 Message-ID: <20240530111947.549474-9-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=1883; i=CoelacanthusHex@gmail.com; h=from:subject; bh=FEk4ZichD7CqTRAppezRH+4H9dhTF4GYT9EUDpibpAE=; b=owJ4nJvAy8zAJfY4pvNJRPo6U8bTakkMaREJ16rP/zv78xijc+SbFuluq7KoDVxfdGb3ntmwV 4b5b/rJ87kdpSwMYlwMsmKKLGI7n75eVvrowzJekxkwc1iZQIYwcHEKwERiuRj+FyWbH5kg7nGC bXudX8b5SVrfDn7ffNohZmU9l4bwcat4U4b/tfNS9VctvP7+NI+h5NrpGpcrHCr9as+x9XPYVM9 LOc3JBwDwgkw9 X-Developer-Key: i=CoelacanthusHex@gmail.com; a=openpgp; fpr=892EBC7DC392DFF9C9C03F1D15F4180E73787863 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Commit ba6cfef057e1 ("riscv: enable Docker requirements in defconfig") introduced it because of Docker, but Docker has removed this requirement since [1] (2023-04-19). 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.[2] 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.[3] [1]: https://github.com/moby/moby/commit/005150ed69c540fb0b5323e0f2208608c1= 204536 [2]: https://bugzilla.redhat.com/show_bug.cgi?id=3D1229700 [3]: https://github.com/systemd/systemd/issues/13781#issuecomment-549164383 Fixes: ba6cfef057e1 ("riscv: enable Docker requirements in defconfig") Signed-off-by: Celeste Liu --- arch/riscv/configs/defconfig | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/riscv/configs/defconfig b/arch/riscv/configs/defconfig index 12dc8c73a8ac..de85c3ab261e 100644 --- a/arch/riscv/configs/defconfig +++ b/arch/riscv/configs/defconfig @@ -9,7 +9,6 @@ CONFIG_CGROUPS=3Dy CONFIG_MEMCG=3Dy CONFIG_CGROUP_SCHED=3Dy CONFIG_CFS_BANDWIDTH=3Dy -CONFIG_RT_GROUP_SCHED=3Dy CONFIG_CGROUP_PIDS=3Dy CONFIG_CGROUP_FREEZER=3Dy CONFIG_CGROUP_HUGETLB=3Dy --=20 2.45.1 From nobody Tue Dec 16 14:37:39 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; 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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 From nobody Tue Dec 16 14:37:39 2025 Received: from mail-pg1-f196.google.com (mail-pg1-f196.google.com [209.85.215.196]) (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 0626E17FADC; 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Thu, 30 May 2024 04:20:13 -0700 (PDT) Received: from localhost ([212.107.28.52]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7021feb0b7dsm2116952b3a.25.2024.05.30.04.20.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 May 2024 04:20:12 -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 3/6] mips: defconfig: drop RT_GROUP_SCHED=y from generic/db1xxx/eyeq5 Date: Thu, 30 May 2024 19:19:51 +0800 Message-ID: <20240530111947.549474-11-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=2501; i=CoelacanthusHex@gmail.com; h=from:subject; bh=iuzxupRQlKvaCQIBiZ4xlf2r612WVp0v0y+1iZrYbx8=; b=owJ4nJvAy8zAJfY4pvNJRPo6U8bTakkMaREJN5aHbSvetGXDI9/Lgg/2RZ0Pr9tZ2Zeh8l34s JFf/NkbX3s7SlkYxLgYZMUUWcR2Pn29rPTRh2W8JjNg5rAygQxh4OIUgIkc2cnw3+dB99H+ecua Oiy0mLQjDFasNi7dvfTwkdv38ytDfrqaLGRkOOx28cCrP0VHmn/UfmB7LhiTWCzOvmna5ka3YIu yCes1WADtNVCT 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 --- arch/mips/configs/db1xxx_defconfig | 1 - arch/mips/configs/eyeq5_defconfig | 1 - arch/mips/configs/generic_defconfig | 1 - 3 files changed, 3 deletions(-) diff --git a/arch/mips/configs/db1xxx_defconfig b/arch/mips/configs/db1xxx_= defconfig index b2d9253ff786..6eff21ff15d5 100644 --- a/arch/mips/configs/db1xxx_defconfig +++ b/arch/mips/configs/db1xxx_defconfig @@ -12,7 +12,6 @@ CONFIG_MEMCG=3Dy CONFIG_BLK_CGROUP=3Dy CONFIG_CGROUP_SCHED=3Dy CONFIG_CFS_BANDWIDTH=3Dy -CONFIG_RT_GROUP_SCHED=3Dy CONFIG_CGROUP_FREEZER=3Dy CONFIG_CGROUP_DEVICE=3Dy CONFIG_CGROUP_CPUACCT=3Dy diff --git a/arch/mips/configs/eyeq5_defconfig b/arch/mips/configs/eyeq5_de= fconfig index c35c29a4d479..3794707c9522 100644 --- a/arch/mips/configs/eyeq5_defconfig +++ b/arch/mips/configs/eyeq5_defconfig @@ -8,7 +8,6 @@ CONFIG_IKCONFIG_PROC=3Dy CONFIG_MEMCG=3Dy CONFIG_BLK_CGROUP=3Dy CONFIG_CFS_BANDWIDTH=3Dy -CONFIG_RT_GROUP_SCHED=3Dy CONFIG_CGROUP_PIDS=3Dy CONFIG_CGROUP_FREEZER=3Dy CONFIG_CPUSETS=3Dy diff --git a/arch/mips/configs/generic_defconfig b/arch/mips/configs/generi= c_defconfig index 071e2205c7ed..fa916407bdd4 100644 --- a/arch/mips/configs/generic_defconfig +++ b/arch/mips/configs/generic_defconfig @@ -5,7 +5,6 @@ CONFIG_IKCONFIG_PROC=3Dy CONFIG_MEMCG=3Dy CONFIG_BLK_CGROUP=3Dy CONFIG_CFS_BANDWIDTH=3Dy -CONFIG_RT_GROUP_SCHED=3Dy CONFIG_CGROUP_PIDS=3Dy CONFIG_CGROUP_FREEZER=3Dy CONFIG_CPUSETS=3Dy --=20 2.45.1 From nobody Tue Dec 16 14:37:39 2025 Received: from mail-pl1-f193.google.com (mail-pl1-f193.google.com [209.85.214.193]) (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 2624B1822E0; 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Thu, 30 May 2024 04:20:15 -0700 (PDT) Received: from localhost ([212.107.28.52]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1f48bbbcaf0sm81594105ad.48.2024.05.30.04.20.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 May 2024 04:20:15 -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 4/6] powerpc: defconfig: drop RT_GROUP_SCHED=y from ppc6xx_defconfig Date: Thu, 30 May 2024 19:19:52 +0800 Message-ID: <20240530111947.549474-12-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=1725; i=CoelacanthusHex@gmail.com; h=from:subject; bh=Y154zJjweZqXiEFejTlLKuxlmlIxiSlX1+quATRaPS0=; b=owJ4nJvAy8zAJfY4pvNJRPo6U8bTakkMaREJNwz83B+K5vRMSbg2N3g2v23ulidmG/9Zikz5N r1Q2vnFpk0dpSwMYlwMsmKKLGI7n75eVvrowzJekxkwc1iZQIYwcHEKwES4nzD89/SoEmo8dO8G n0eO7Aw1cZt90Zb+dnteRPD1pkVFLBEsZmT4umrj9jtvzS78ub1pD3/1w7Mzvl6+8T9jVc6dBXm cuVf72AEUHU7d X-Developer-Key: i=CoelacanthusHex@gmail.com; a=openpgp; fpr=892EBC7DC392DFF9C9C03F1D15F4180E73787863 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Commit 6e5f1537833a ("powerpc: Add a 6xx defconfig") said it was copied from fedore's ppc32 defconfig, but at least since 2015-06-10, Fedora has dropped this option.[1] 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. 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 --- arch/powerpc/configs/ppc6xx_defconfig | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/powerpc/configs/ppc6xx_defconfig b/arch/powerpc/configs/p= pc6xx_defconfig index 66c7b28d7450..c06344db0eb3 100644 --- a/arch/powerpc/configs/ppc6xx_defconfig +++ b/arch/powerpc/configs/ppc6xx_defconfig @@ -12,7 +12,6 @@ CONFIG_TASK_XACCT=3Dy CONFIG_TASK_IO_ACCOUNTING=3Dy CONFIG_CGROUPS=3Dy CONFIG_CGROUP_SCHED=3Dy -CONFIG_RT_GROUP_SCHED=3Dy CONFIG_CGROUP_DEVICE=3Dy CONFIG_CGROUP_CPUACCT=3Dy CONFIG_USER_NS=3Dy --=20 2.45.1 From nobody Tue Dec 16 14:37:39 2025 Received: from mail-pl1-f195.google.com (mail-pl1-f195.google.com [209.85.214.195]) (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 945441822DE; 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Thu, 30 May 2024 04:20:17 -0700 (PDT) Received: from localhost ([212.107.28.52]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1f62218d9e6sm9517475ad.117.2024.05.30.04.20.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 May 2024 04:20:17 -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 5/6] sh: defconfig: drop RT_GROUP_SCHED=y from sdk7786/urquell Date: Thu, 30 May 2024 19:19:53 +0800 Message-ID: <20240530111947.549474-13-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=2029; i=CoelacanthusHex@gmail.com; h=from:subject; bh=kOqrnzdbmJCW+4DZmJVchuzFR6LT5fL9WaReqTWmC8g=; b=owJ4nJvAy8zAJfY4pvNJRPo6U8bTakkMaREJNwub0yXLjr83sFl6+r9m9kR/++RbfTfmNMpv7 my3dmlavLujlIVBjItBVkyRRWzn09fLSh99WMZrMgNmDisTyBAGLk4BmAiHHSPDiWeRLf+fbOwM 1WVrORm/XDDz8bQ1DJ+etga9dN23//qBHoY/HAcKm/+7fhPVYMsRuzTfViI8IXPz8oWr86eHXVw Sp9rHBgChF03a 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 --- arch/sh/configs/sdk7786_defconfig | 1 - arch/sh/configs/urquell_defconfig | 1 - 2 files changed, 2 deletions(-) diff --git a/arch/sh/configs/sdk7786_defconfig b/arch/sh/configs/sdk7786_de= fconfig index 7b427c17fbfe..3599b1683593 100644 --- a/arch/sh/configs/sdk7786_defconfig +++ b/arch/sh/configs/sdk7786_defconfig @@ -17,7 +17,6 @@ CONFIG_CPUSETS=3Dy CONFIG_CGROUP_CPUACCT=3Dy CONFIG_CGROUP_MEMCG=3Dy CONFIG_CGROUP_SCHED=3Dy -CONFIG_RT_GROUP_SCHED=3Dy CONFIG_BLK_CGROUP=3Dy CONFIG_RELAY=3Dy CONFIG_NAMESPACES=3Dy diff --git a/arch/sh/configs/urquell_defconfig b/arch/sh/configs/urquell_de= fconfig index 00ef62133b04..9cf4a719001e 100644 --- a/arch/sh/configs/urquell_defconfig +++ b/arch/sh/configs/urquell_defconfig @@ -15,7 +15,6 @@ CONFIG_CPUSETS=3Dy CONFIG_CGROUP_CPUACCT=3Dy CONFIG_CGROUP_MEMCG=3Dy CONFIG_CGROUP_SCHED=3Dy -CONFIG_RT_GROUP_SCHED=3Dy CONFIG_BLK_DEV_INITRD=3Dy CONFIG_PROFILING=3Dy CONFIG_MODULES=3Dy --=20 2.45.1 From nobody Tue Dec 16 14:37:39 2025 Received: from mail-pl1-f196.google.com (mail-pl1-f196.google.com [209.85.214.196]) (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 31CF3178CEA; 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Thu, 30 May 2024 04:20:20 -0700 (PDT) Received: from localhost ([212.107.28.52]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1f48e95c85asm80546745ad.34.2024.05.30.04.20.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 May 2024 04:20:19 -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 6/6] arm: defconfig: drop RT_GROUP_SCHED=y from bcm2855/tegra/omap2plus Date: Thu, 30 May 2024 19:19:54 +0800 Message-ID: <20240530111947.549474-14-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=2729; i=CoelacanthusHex@gmail.com; h=from:subject; bh=z/Xh6Oh4/edMyA0oTGEdVRRBweOMR/LS4ucNKKx8jxk=; b=owJ4nJvAy8zAJfY4pvNJRPo6U8bTakkMaREJt//Jpz1/9vq+ftrjnHPOdUJ7Zl16y3oqfNMJ2 c4TmxeuZVnZUcrCIMbFICumyCK28+nrZaWPPizjNZkBM4eVCWQIAxenAExEIJzhf8HRRdu8P/5W lRSfdEtSzuIjW+AJrhe/BHfb27mxp8vLBjP8D+rcabfgddQ8Botz1wy6Gi5ev2tY0Ppvy/7rzt8 y5t8MZQUAhClPwQ== X-Developer-Key: i=CoelacanthusHex@gmail.com; a=openpgp; fpr=892EBC7DC392DFF9C9C03F1D15F4180E73787863 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Commit 673ce00c5d6c ("ARM: omap2plus_defconfig: Add support for distros with systemd") said it's because of recommendation from systemd. But systemd changed their recommendation later.[1] 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.[2] 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. [1]: https://github.com/systemd/systemd/commit/f4e74be1856b3ac058acbf1be321= c31d5299f69f [2]: https://bugzilla.redhat.com/show_bug.cgi?id=3D1229700 Signed-off-by: Celeste Liu Acked-by: Kevin Hilman Tested-by: Stefan Wahren --- arch/arm/configs/bcm2835_defconfig | 1 - arch/arm/configs/omap2plus_defconfig | 1 - arch/arm/configs/tegra_defconfig | 1 - 3 files changed, 3 deletions(-) diff --git a/arch/arm/configs/bcm2835_defconfig b/arch/arm/configs/bcm2835_= defconfig index b5f0bd8dd536..27dc3bf6b124 100644 --- a/arch/arm/configs/bcm2835_defconfig +++ b/arch/arm/configs/bcm2835_defconfig @@ -7,7 +7,6 @@ CONFIG_BSD_PROCESS_ACCT=3Dy CONFIG_BSD_PROCESS_ACCT_V3=3Dy CONFIG_LOG_BUF_SHIFT=3D18 CONFIG_CFS_BANDWIDTH=3Dy -CONFIG_RT_GROUP_SCHED=3Dy CONFIG_CGROUP_FREEZER=3Dy CONFIG_CPUSETS=3Dy CONFIG_CGROUP_DEVICE=3Dy diff --git a/arch/arm/configs/omap2plus_defconfig b/arch/arm/configs/omap2p= lus_defconfig index 3a166c2f02bd..9cb265c8d414 100644 --- a/arch/arm/configs/omap2plus_defconfig +++ b/arch/arm/configs/omap2plus_defconfig @@ -13,7 +13,6 @@ CONFIG_MEMCG=3Dy CONFIG_BLK_CGROUP=3Dy CONFIG_CGROUP_SCHED=3Dy CONFIG_CFS_BANDWIDTH=3Dy -CONFIG_RT_GROUP_SCHED=3Dy CONFIG_CGROUP_FREEZER=3Dy CONFIG_CPUSETS=3Dy CONFIG_CGROUP_DEVICE=3Dy diff --git a/arch/arm/configs/tegra_defconfig b/arch/arm/configs/tegra_defc= onfig index d2a094ad360c..3a9bda2bf422 100644 --- a/arch/arm/configs/tegra_defconfig +++ b/arch/arm/configs/tegra_defconfig @@ -6,7 +6,6 @@ CONFIG_IKCONFIG=3Dy CONFIG_IKCONFIG_PROC=3Dy CONFIG_CGROUPS=3Dy CONFIG_CGROUP_SCHED=3Dy -CONFIG_RT_GROUP_SCHED=3Dy CONFIG_CGROUP_FREEZER=3Dy CONFIG_CGROUP_CPUACCT=3Dy CONFIG_CGROUP_DEBUG=3Dy --=20 2.45.1