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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 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