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Message-Id: <171888775124.806750.6633317613524015778.b4-ty@ellerman.id.au>
Date: Thu, 20 Jun 2024 22:49:11 +1000
From: Michael Ellerman <patch-notifications@...erman.id.au>
To: Heinrich Schuchardt <heinrich.schuchardt@...onical.com>,
	Anup Patel <anup@...infault.org>, Guo Ren <guoren@...nel.org>,
	Palmer Dabbelt <palmer@...osinc.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Huacai Chen <chenhuacai@...nel.org>, WANG Xuerui <kernel@...0n.name>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>,
	Gregory CLEMENT <gregory.clement@...tlin.com>,
	Théo Lebrun <theo.lebrun@...tlin.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Nicholas Piggin <npiggin@...il.com>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	"Naveen N . Rao" <naveen.n.rao@...ux.ibm.com>,
	Sven Joachim <svenjoac@....de>,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	Rich Felker <dalias@...c.org>,
	John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
	Russell King <linux@...linux.org.uk>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Ray Jui <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>,
	Broadcom internal kernel review list <"b cm-kernel-feedback-list"@broadcom.com>,
	Tony Lindgren <tony@...mide.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Jonathan Hunter <jonathanh@...dia.com>,
	Arnd Bergmann <arnd@...db.de>, Mykola Lysenko <mykolal@...com>,
	linux-riscv@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rpi-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
	linux-tegra@...r.kernel.org, loongarch@...ts.linux.dev,
	linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-sh@...r.kernel.org, Celeste Liu <coelacanthushex@...il.com>
Cc: linux-kselftest@...r.kernel.org, bpf@...r.kernel.org, linux-kernel@...r.kernel.org, Lennart Poettering <lennart@...ttering.net>, Icenowy Zheng <uwu@...nowy.me>, Celeste Liu <CoelacanthusHex@...il.com>
Subject: Re: (subset) [PATCH 0/6] defconfig: drop RT_GROUP_SCHED=y

On Thu, 30 May 2024 19:19:48 +0800, Celeste Liu wrote:
> 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 need to
> be sum up to < 1 for each individal cgroup. That means we cannot really come up
> with values that would work by default in the general case.[1]
> 
> [...]

Patch 4 applied to powerpc/next.

[4/6] powerpc: defconfig: drop RT_GROUP_SCHED=y from ppc6xx_defconfig
      https://git.kernel.org/powerpc/c/2bac6caee94e25f59ee47e2d365d7e07465089ba

cheers

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