From: Juri Lelli <juri.lelli@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Yuri Andriaccio <yurand2000@gmail.com>,
Ingo Molnar <mingo@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
Valentin Schneider <vschneid@redhat.com>,
linux-kernel@vger.kernel.org,
Luca Abeni <luca.abeni@santannapisa.it>,
Yuri Andriaccio <yuri.andriaccio@santannapisa.it>
Subject: Re: [RFC PATCH v5 19/29] sched/rt: Remove support for cgroups-v1
Date: Thu, 7 May 2026 17:35:23 +0200 [thread overview]
Message-ID: <afyxO0LydpVzAiaR@jlelli-thinkpadt14gen4.remote.csb> (raw)
In-Reply-To: <20260505150144.GE3102624@noisy.programming.kicks-ass.net>
On 05/05/26 17:01, Peter Zijlstra wrote:
> On Thu, Apr 30, 2026 at 11:38:23PM +0200, Yuri Andriaccio wrote:
> > Disable control files for cgroups-v1, and allow only cgroups-v2.
> > This should simplify maintaining the code, since cgroups-v1 are deprecated.
>
> So while I love seeing all this code go away; I very much doubt we can
> pull this off. People might actually be using this.
Quite a bold move indeed. :)
> I think at best we can hide the whole cgroup-v1 thing behind a CONFIG
> and eventually remove once no distro is left using it or something like
> that :/
This however means we will essentially need to maintain 2 versions of
rt.c until v1 is gone? AFAIK v1 rt group implementation is quite a
substantial amount of code. :/
I certainly see your point, just thinking out loud about what options do
we realistically have. Once HCBS is eventually merged, can we consider
v1 RT GROUP feature terminally broken and just point people at v2 if
they report an issue with v1?
next prev parent reply other threads:[~2026-05-07 15:35 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-30 21:38 [RFC PATCH v5 00/29] Hierarchical Constant Bandwidth Server Yuri Andriaccio
2026-04-30 21:38 ` [RFC PATCH v5 01/29] sched/deadline: Fix replenishment logic for non-deferred servers Yuri Andriaccio
2026-05-20 8:34 ` [tip: sched/core] " tip-bot2 for Yuri Andriaccio
2026-04-30 21:38 ` [RFC PATCH v5 02/29] sched/deadline: Do not access dl_se->rq directly Yuri Andriaccio
2026-04-30 21:38 ` [RFC PATCH v5 03/29] sched/deadline: Distinguish between dl_rq and my_q Yuri Andriaccio
2026-04-30 21:38 ` [RFC PATCH v5 04/29] sched/rt: Pass an rt_rq instead of an rq where needed Yuri Andriaccio
2026-04-30 21:38 ` [RFC PATCH v5 05/29] sched/rt: Move functions from rt.c to sched.h Yuri Andriaccio
2026-04-30 21:38 ` [RFC PATCH v5 06/29] sched/rt: Disable RT_GROUP_SCHED Yuri Andriaccio
2026-04-30 21:38 ` [RFC PATCH v5 07/29] sched/rt: Remove unnecessary runqueue pointer in struct rt_rq Yuri Andriaccio
2026-04-30 21:38 ` [RFC PATCH v5 08/29] sched/rt: Introduce HCBS specific structs in task_group Yuri Andriaccio
2026-04-30 21:38 ` [RFC PATCH v5 09/29] sched/core: Initialize HCBS specific structures Yuri Andriaccio
2026-04-30 21:38 ` [RFC PATCH v5 10/29] sched/deadline: Add dl_init_tg Yuri Andriaccio
2026-04-30 21:38 ` [RFC PATCH v5 11/29] sched/rt: Add {alloc/unregister/free}_rt_sched_group Yuri Andriaccio
2026-04-30 21:38 ` [RFC PATCH v5 12/29] sched/deadline: Account rt-cgroups bandwidth in deadline tasks schedulability tests Yuri Andriaccio
2026-04-30 21:38 ` [RFC PATCH v5 13/29] sched/rt: Implement dl-server operations for rt-cgroups Yuri Andriaccio
2026-05-05 13:04 ` Peter Zijlstra
2026-04-30 21:38 ` [RFC PATCH v5 14/29] sched/rt: Update task event callbacks for HCBS scheduling Yuri Andriaccio
2026-05-05 13:16 ` Peter Zijlstra
2026-04-30 21:38 ` [RFC PATCH v5 15/29] sched/rt: Update rt-cgroup schedulability checks Yuri Andriaccio
2026-05-05 14:36 ` Peter Zijlstra
2026-04-30 21:38 ` [RFC PATCH v5 16/29] sched/rt: Allow zeroing the runtime of the root control group Yuri Andriaccio
2026-04-30 21:38 ` [RFC PATCH v5 17/29] sched/rt: Remove old RT_GROUP_SCHED data structures Yuri Andriaccio
2026-04-30 21:38 ` [RFC PATCH v5 18/29] sched/core: Cgroup v2 support Yuri Andriaccio
2026-05-05 14:59 ` Peter Zijlstra
2026-05-06 19:58 ` luca abeni
2026-05-07 7:01 ` Peter Zijlstra
2026-05-07 13:30 ` luca abeni
2026-05-07 14:16 ` Peter Zijlstra
2026-04-30 21:38 ` [RFC PATCH v5 19/29] sched/rt: Remove support for cgroups-v1 Yuri Andriaccio
2026-05-05 15:01 ` Peter Zijlstra
2026-05-07 15:35 ` Juri Lelli [this message]
2026-05-13 12:15 ` Yuri Andriaccio
2026-05-13 14:37 ` Juri Lelli
2026-04-30 21:38 ` [RFC PATCH v5 20/29] sched/deadline: Allow deeper hierarchies of RT cgroups Yuri Andriaccio
2026-05-05 15:15 ` Peter Zijlstra
2026-05-05 19:56 ` Tejun Heo
2026-05-07 10:53 ` Peter Zijlstra
2026-05-07 15:03 ` Juri Lelli
2026-05-07 15:05 ` Peter Zijlstra
2026-05-07 16:39 ` luca abeni
2026-05-11 9:29 ` Juri Lelli
2026-05-11 17:52 ` Tejun Heo
2026-05-07 16:44 ` luca abeni
2026-05-11 9:40 ` luca abeni
2026-05-11 18:15 ` Tejun Heo
2026-05-11 17:37 ` Tejun Heo
2026-05-07 14:30 ` luca abeni
2026-05-11 18:28 ` Tejun Heo
2026-05-12 17:38 ` Yuri Andriaccio
2026-05-12 18:19 ` Tejun Heo
2026-05-12 18:20 ` Tejun Heo
2026-05-13 12:08 ` Yuri Andriaccio
2026-05-13 19:10 ` Tejun Heo
2026-05-14 7:25 ` luca abeni
2026-05-14 22:20 ` Tejun Heo
2026-05-18 15:27 ` Yuri Andriaccio
2026-05-18 18:47 ` Tejun Heo
2026-05-19 21:02 ` [BULK] " luca abeni
2026-05-20 18:49 ` Tejun Heo
2026-04-30 21:38 ` [RFC PATCH v5 21/29] sched/rt: Update default bandwidth for real-time tasks to ONE Yuri Andriaccio
2026-05-20 8:34 ` [tip: sched/core] " tip-bot2 for Yuri Andriaccio
2026-04-30 21:38 ` [RFC PATCH v5 22/29] sched/rt: Add rt-cgroup migration functions Yuri Andriaccio
2026-05-05 15:20 ` Peter Zijlstra
2026-05-05 15:24 ` Peter Zijlstra
2026-04-30 21:38 ` [RFC PATCH v5 23/29] sched/rt: Hook HCBS " Yuri Andriaccio
2026-04-30 21:38 ` [RFC PATCH v5 24/29] sched/core: Execute enqueued balance callbacks when changing allowed CPUs Yuri Andriaccio
2026-04-30 21:38 ` [RFC PATCH v5 25/29] sched/rt: Try pull task on empty server pick Yuri Andriaccio
2026-04-30 21:38 ` [RFC PATCH v5 26/29] sched/core: Execute enqueued balance callbacks after migrate_disable_switch Yuri Andriaccio
2026-04-30 21:38 ` [RFC PATCH v5 27/29] Documentation: Update documentation for real-time cgroups Yuri Andriaccio
2026-04-30 21:38 ` [RFC PATCH v5 28/29] sched/rt: Add debug BUG_ONs for pre-migration code Yuri Andriaccio
2026-04-30 21:38 ` [RFC PATCH v5 29/29] sched/rt: Add debug BUG_ONs in migration code Yuri Andriaccio
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