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Tue, 10 Sep 2024 05:51:22 -0700 (PDT) From: Celeste Liu X-Google-Original-From: Celeste Liu Date: Tue, 10 Sep 2024 20:51:07 +0800 Subject: [PATCH v3 1/4] riscv: defconfig: drop RT_GROUP_SCHED=y 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: <20240910-fix-riscv-rt_group_sched-v3-1-486e75e5ae6d@gmail.com> References: <20240910-fix-riscv-rt_group_sched-v3-0-486e75e5ae6d@gmail.com> In-Reply-To: <20240910-fix-riscv-rt_group_sched-v3-0-486e75e5ae6d@gmail.com> To: Paul Walmsley , Palmer Dabbelt , Albert Ou , Guo Ren , Anup Patel , Heinrich Schuchardt , Huacai Chen , WANG Xuerui , Yoshinori Sato , Rich Felker , John Paul Adrian Glaubitz , Russell King , Florian Fainelli , Broadcom internal kernel review list , Ray Jui , Scott Branden , Tony Lindgren , Thierry Reding , Jonathan Hunter Cc: Palmer Dabbelt , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-sh@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rpi-kernel@lists.infradead.org, linux-omap@vger.kernel.org, linux-tegra@vger.kernel.org, Celeste Liu X-Mailer: b4 0.15-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=1936; i=CoelacanthusHex@gmail.com; h=from:subject:message-id; bh=cfUrWXL9qtt/rVda6iREvTUmuGd0VH6THULMDnviMOM=; b=owJ4nJvAy8zAJfY4pvNJRPo6U8bTakkMaQ8cDm15vp/BYfcFjgX95w7z6J1xDnyz/unOC5Ybh Ru7vd5krt/bUcrCIMbFICumyCK28+nrZaWPPizjNZkBM4eVCWQIAxenAEzk1h+G/3nNNzrefDjr uVHmtuD2L8ZKWk3ztJKEfp63tdjRv3j2njUM/7MmH5p8S52Ljfl156oFGppi72Q6l51aoTf3s1v Ttv0OB1kAKbhR+Q== X-Developer-Key: i=CoelacanthusHex@gmail.com; a=openpgp; fpr=892EBC7DC392DFF9C9C03F1D15F4180E73787863 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 Acked-by: Heinrich Schuchardt Signed-off-by: Celeste Liu Acked-by: Charlie Jenkins --- arch/riscv/configs/defconfig | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/riscv/configs/defconfig b/arch/riscv/configs/defconfig index 12dc8c73a8acfaa5c8f442968a807de303428d9e..de85c3ab261e6d62b2089a3c89b= dc9d1b34fa792 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 2.46.0 From nobody Sat Nov 30 07:25:20 2024 Received: from mail-pj1-f65.google.com (mail-pj1-f65.google.com [209.85.216.65]) (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 67819192B76; 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Tue, 10 Sep 2024 05:51:25 -0700 (PDT) Received: from localhost ([212.107.28.55]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2db049883e5sm6314220a91.50.2024.09.10.05.51.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Sep 2024 05:51:25 -0700 (PDT) From: Celeste Liu X-Google-Original-From: Celeste Liu Date: Tue, 10 Sep 2024 20:51:08 +0800 Subject: [PATCH v3 2/4] loongarch: defconfig: drop RT_GROUP_SCHED=y 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: <20240910-fix-riscv-rt_group_sched-v3-2-486e75e5ae6d@gmail.com> References: <20240910-fix-riscv-rt_group_sched-v3-0-486e75e5ae6d@gmail.com> In-Reply-To: <20240910-fix-riscv-rt_group_sched-v3-0-486e75e5ae6d@gmail.com> To: Paul Walmsley , Palmer Dabbelt , Albert Ou , Guo Ren , Anup Patel , Heinrich Schuchardt , Huacai Chen , WANG Xuerui , Yoshinori Sato , Rich Felker , John Paul Adrian Glaubitz , Russell King , Florian Fainelli , Broadcom internal kernel review list , Ray Jui , Scott Branden , Tony Lindgren , Thierry Reding , Jonathan Hunter Cc: Palmer Dabbelt , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-sh@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rpi-kernel@lists.infradead.org, linux-omap@vger.kernel.org, linux-tegra@vger.kernel.org, Xi Ruoyao , Celeste Liu X-Mailer: b4 0.15-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=1732; i=CoelacanthusHex@gmail.com; h=from:subject:message-id; bh=6wdnV6HdMVkp3ugnGGe8eg7mkzP3v3E6CFTydp2vS4k=; b=owJ4nJvAy8zAJfY4pvNJRPo6U8bTakkMaQ8cDrv6t52TOH0iZkrUt9brR8+cNvzzWly4edHmz KnS8YlRey07SlkYxLgYZMUUWcR2Pn29rPTRh2W8JjNg5rAygQxh4OIUgIk8q2dkeCn9ctNlT57W mV7nV6ddm1O/7t3//P5ipuOnTFb9ePuY9REjQ9PLM2/CDl+fIVI3uTfpqs7h2D4hubfuDpWL5s1 2tGqKZAAA05JRXA== X-Developer-Key: i=CoelacanthusHex@gmail.com; a=openpgp; fpr=892EBC7DC392DFF9C9C03F1D15F4180E73787863 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 Reviewed-by: Xi Ruoyao Signed-off-by: Celeste Liu --- 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 b4252c357c8e232ec7ba452881dcd7cb0d7f9aa2..4d93adb3f1a220ddd19a5437ff0= 74e7fa9f3e1dd 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 2.46.0 From nobody Sat Nov 30 07:25:20 2024 Received: from mail-pg1-f195.google.com (mail-pg1-f195.google.com [209.85.215.195]) (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 81956192D97; 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Tue, 10 Sep 2024 05:51:27 -0700 (PDT) Received: from localhost ([212.107.28.55]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2db04966b75sm6317071a91.36.2024.09.10.05.51.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Sep 2024 05:51:27 -0700 (PDT) From: Celeste Liu X-Google-Original-From: Celeste Liu Date: Tue, 10 Sep 2024 20:51:09 +0800 Subject: [PATCH v3 3/4] sh: defconfig: drop RT_GROUP_SCHED=y from sdk7786/urquell 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: <20240910-fix-riscv-rt_group_sched-v3-3-486e75e5ae6d@gmail.com> References: <20240910-fix-riscv-rt_group_sched-v3-0-486e75e5ae6d@gmail.com> In-Reply-To: <20240910-fix-riscv-rt_group_sched-v3-0-486e75e5ae6d@gmail.com> To: Paul Walmsley , Palmer Dabbelt , Albert Ou , Guo Ren , Anup Patel , Heinrich Schuchardt , Huacai Chen , WANG Xuerui , Yoshinori Sato , Rich Felker , John Paul Adrian Glaubitz , Russell King , Florian Fainelli , Broadcom internal kernel review list , Ray Jui , Scott Branden , Tony Lindgren , Thierry Reding , Jonathan Hunter Cc: Palmer Dabbelt , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-sh@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rpi-kernel@lists.infradead.org, linux-omap@vger.kernel.org, linux-tegra@vger.kernel.org, Celeste Liu X-Mailer: b4 0.15-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=2143; i=CoelacanthusHex@gmail.com; h=from:subject:message-id; bh=i4dMYbikEhftIrSd1gq7tvjKJfStRheJwUa1Cpif+Lw=; b=owJ4nJvAy8zAJfY4pvNJRPo6U8bTakkMaQ8cjhgVSl/QKw754HE9X+Szg08Pp2726RsspZo1s cuehoW11HeUsjCIcTHIiimyiO18+npZ6aMPy3hNZsDMYWUCGcLAxSkAE5EsZGSYdUDWq+zSzrNb uf2nMx3iy3m2PDCA48XSy62/naf1Wu9cwvBXwMtR5NxLTpaWCzuFXEqvq6VyxJlzXj0uYqrOt+/ TP1EOAFFySKE= X-Developer-Key: i=CoelacanthusHex@gmail.com; a=openpgp; fpr=892EBC7DC392DFF9C9C03F1D15F4180E73787863 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 7b427c17fbfecb24d63e717023aad19ce1c953e8..3599b1683593b865d863800eb84= b3f8f89d3d57e 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 00ef62133b04ded8d0b4221f11e0adafde99d386..9cf4a719001ea5ef4b031c1bbbf= 8098e8af5a2b2 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 2.46.0 From nobody Sat Nov 30 07:25:20 2024 Received: from mail-pj1-f66.google.com (mail-pj1-f66.google.com [209.85.216.66]) (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 6EB9B194151; 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Tue, 10 Sep 2024 05:51:30 -0700 (PDT) Received: from localhost ([212.107.28.55]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2db044f37dasm6265325a91.34.2024.09.10.05.51.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Sep 2024 05:51:30 -0700 (PDT) From: Celeste Liu X-Google-Original-From: Celeste Liu Date: Tue, 10 Sep 2024 20:51:10 +0800 Subject: [PATCH v3 4/4] arm: defconfig: drop RT_GROUP_SCHED=y from bcm2835/tegra/omap2plus 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: <20240910-fix-riscv-rt_group_sched-v3-4-486e75e5ae6d@gmail.com> References: <20240910-fix-riscv-rt_group_sched-v3-0-486e75e5ae6d@gmail.com> In-Reply-To: <20240910-fix-riscv-rt_group_sched-v3-0-486e75e5ae6d@gmail.com> To: Paul Walmsley , Palmer Dabbelt , Albert Ou , Guo Ren , Anup Patel , Heinrich Schuchardt , Huacai Chen , WANG Xuerui , Yoshinori Sato , Rich Felker , John Paul Adrian Glaubitz , Russell King , Florian Fainelli , Broadcom internal kernel review list , Ray Jui , Scott Branden , Tony Lindgren , Thierry Reding , Jonathan Hunter Cc: Palmer Dabbelt , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-sh@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rpi-kernel@lists.infradead.org, linux-omap@vger.kernel.org, linux-tegra@vger.kernel.org, Stefan Wahren , Kevin Hilman , Celeste Liu X-Mailer: b4 0.15-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=2991; i=CoelacanthusHex@gmail.com; h=from:subject:message-id; bh=KOEEs/y0FGCkb+klP+KV9yU4iwr2GAi37Ho3J9O83lo=; b=owJ4nJvAy8zAJfY4pvNJRPo6U8bTakkMaQ8cjir6+kzR+lXemlktLKMwjd0/+nsN053LZ/95b tR0LFP2z+0oZWEQ42KQFVNkEdv59PWy0kcflvGazICZw8oEMoSBi1MAJrKZg5HhTsqW+5GH5+f+ PfjZ/6VgcMRh1595TKq7D4cys8gH9mkpMTKsn7GpjoXF8dtcKaszT4L+POBuC/yTIPtRKmja47U cUz7zAQA0aEnq X-Developer-Key: i=CoelacanthusHex@gmail.com; a=openpgp; fpr=892EBC7DC392DFF9C9C03F1D15F4180E73787863 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 Tested-by: Stefan Wahren Acked-by: Kevin Hilman Signed-off-by: Celeste Liu --- 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 b5f0bd8dd536990a0726e73a6855d25c1286a768..27dc3bf6b124c2012b7a1a768f2= f900f49903cd1 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 3a166c2f02bd80634fee3bd8c4579fdbad84ccfa..9cb265c8d4144ea9a41f02640db= c8a06b710323b 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 d2a094ad360cefefbc3bd35226c5d23eadce42c1..3a9bda2bf422b14085c60b39a2c= 3df86fe0994bb 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 2.46.0