From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Tejun Heo <tj@kernel.org>
Cc: linux-rt-devel@lists.linux.dev, cgroups@vger.kernel.org,
linux-kernel@vger.kernel.org, "Ingo Molnar" <mingo@redhat.com>,
"Peter Zijlstra" <peterz@infradead.org>,
"Juri Lelli" <juri.lelli@redhat.com>,
"Vincent Guittot" <vincent.guittot@linaro.org>,
"Dietmar Eggemann" <dietmar.eggemann@arm.com>,
"Steven Rostedt" <rostedt@goodmis.org>,
"K Prateek Nayak" <kprateek.nayak@amd.com>,
"Johannes Weiner" <hannes@cmpxchg.org>,
"Michal Koutný" <mkoutny@suse.com>,
"John Ogness" <john.ogness@linutronix.de>,
"Shrikanth Hegde" <sshegde@linux.ibm.com>,
"Yuri Andriaccio" <yurand2000@gmail.com>,
"Yuri Andriaccio" <yuri.andriaccio@santannapisa.it>,
"Luca Abeni" <luca.abeni@santannapisa.it>
Subject: Re: [RFC] RT throttling, DL/ fair server, RT_GROUP_SCHED and everything
Date: Fri, 23 Oct 2026 22:07:48 +0200 [thread overview]
Message-ID: <20261023200748.YZjSwZ48@linutronix.de> (raw)
In-Reply-To: <f29f77edb2776b734306fd482b47a64f@kernel.org>
On 2026-10-23 07:16:10 [-1000], Tejun Heo wrote:
> Hello, Sebastian.
Hi Tejun,
> On Fri, Oct 23, 2026 at 06:13:48PM +0200, Sebastian Andrzej Siewior wrote:
> > - Remove CONFIG_RT_GROUP_SCHED
> > [ ] Yes [ ] No, because
> > _____________________
>
> RT_GROUP_SCHED in its current form isn't widely useful. No major distro
> kernel enables it (Fedora, RHEL/CentOS Stream, Debian, Ubuntu, openSUSE,
> Arch and the Android GKI defconfig, PREEMPT_RT flavors included). I have
> no objection to removing it.
Perfect.
> There was an attempt to make it more useful: the Hierarchical Constant
> Bandwidth Server (HCBS) patchset from Yuri Andriaccio and Luca Abeni. It
> replaces RT_GROUP_SCHED with per-cgroup deadline servers and a cgroup2
> interface. The last posting was RFC v6 in June:
>
> https://lore.kernel.org/all/20260608121546.69910-1-yurand2000@gmail.com/
Yes, I am aware of this. It replaces RT_GROUP_SCHED and does not rely on
it (as far as I remember).
> The effort seems to have stalled.
>
> Thanks.
Sebastian
prev parent reply other threads:[~2026-10-23 20:07 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-23 16:13 Sebastian Andrzej Siewior
2026-10-23 17:16 ` Tejun Heo
2026-10-23 17:19 ` luca abeni
2026-10-23 20:07 ` Sebastian Andrzej Siewior [this message]
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