From: Frederic Weisbecker <frederic@kernel.org>
To: Waiman Long <longman@redhat.com>
Cc: Jing Wu <realwujing@gmail.com>, Thomas Gleixner <tglx@kernel.org>,
linux-kernel@vger.kernel.org, rcu@vger.kernel.org,
cgroups@vger.kernel.org, Qiliang Yuan <yuanql9@chinatelecom.cn>
Subject: Re: [PATCH-next 00/23] cgroup/cpuset: Enable runtime update of nohz_full and managed_irq CPUs
Date: Wed, 1 Jul 2026 16:22:03 +0200 [thread overview]
Message-ID: <akUii2CyEi7SRid7@localhost.localdomain> (raw)
In-Reply-To: <4ad24488-9cc1-4f1c-8dc5-6830ae7420df@redhat.com>
Le Thu, Jun 25, 2026 at 01:27:54AM -0400, Waiman Long a écrit :
> On 6/24/26 2:34 AM, Jing Wu wrote:
> > 3. Are there specific patches in your series where you would welcome
> > our contribution directly?
>
> I have broken down the shutdown callback into separate portions as suggested
> by Thomas. The other major change that I am working on is to try to shutdown
> to only CPUHP_AP_OFFLINE state instead of all the way down to CPUHP_OFFLINE.
What was the reason for that already? Can we perhaps ask the user to offline
the target CPUs before toggling isolation on them?
> That will require some adjustments to the nohz_full related hotplug
> functions. I have some ideas of what needs to be done. However, I haven't
> looked into RCU yet. I know RCU support changing the nocb mask for fully
> offline CPUs, I will need to find out if it possible to do that for
> partially offline CPUs.
No because callbacks can still be enqueued at this stage. But we could
manage to make it work with CPUHP_AP_IDLE_DEAD.
Thanks.
--
Frederic Weisbecker
SUSE Labs
next prev parent reply other threads:[~2026-07-01 14:22 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-21 3:03 [PATCH-next 00/23] cgroup/cpuset: Enable runtime update of nohz_full and managed_irq CPUs Waiman Long
2026-04-21 3:03 ` [PATCH 01/23] sched/isolation: Add HK_TYPE_KERNEL_NOISE_BOOT & HK_TYPE_MANAGED_IRQ_BOOT Waiman Long
2026-04-21 3:03 ` [PATCH 02/23] sched/isolation: Enhance housekeeping_update() to support updating more than one HK cpumask Waiman Long
2026-04-22 6:39 ` Chen Ridong
2026-04-21 3:03 ` [PATCH 03/23] tick/nohz: Make nohz_full parameter optional Waiman Long
2026-04-21 8:32 ` Thomas Gleixner
2026-04-21 14:14 ` Waiman Long
2026-04-24 15:57 ` Frederic Weisbecker
2026-04-21 3:03 ` [PATCH 04/23] tick/nohz: Allow runtime changes in full dynticks CPUs Waiman Long
2026-04-21 8:50 ` Thomas Gleixner
2026-04-21 14:24 ` Waiman Long
2026-05-13 13:04 ` Frederic Weisbecker
2026-04-21 3:03 ` [PATCH 05/23] tick: Pass timer tick job to an online HK CPU in tick_cpu_dying() Waiman Long
2026-04-21 8:55 ` Thomas Gleixner
2026-04-21 14:22 ` Waiman Long
2026-04-21 3:03 ` [PATCH 06/23] rcu/nocbs: Allow runtime changes in RCU NOCBS cpumask Waiman Long
2026-04-21 3:03 ` [PATCH 07/23] watchdog: Sync up with runtime change of isolated CPUs Waiman Long
2026-04-21 3:03 ` [PATCH 08/23] arm64: topology: Use RCU to protect access to HK_TYPE_TICK cpumask Waiman Long
2026-04-22 9:34 ` Chen Ridong
2026-05-13 16:19 ` Frederic Weisbecker
2026-04-21 3:03 ` [PATCH 09/23] workqueue: Use RCU to protect access of HK_TYPE_TIMER cpumask Waiman Long
2026-04-21 3:03 ` [PATCH 10/23] cpu: " Waiman Long
2026-04-21 8:57 ` Thomas Gleixner
2026-04-21 14:25 ` Waiman Long
2026-04-21 3:03 ` [PATCH 11/23] hrtimer: " Waiman Long
2026-04-21 8:59 ` Thomas Gleixner
2026-04-21 3:03 ` [PATCH 12/23] net: Use boot time housekeeping cpumask settings for now Waiman Long
2026-04-21 3:03 ` [PATCH 13/23] sched/core: Use RCU to protect access of HK_TYPE_KERNEL_NOISE cpumask Waiman Long
2026-04-21 3:03 ` [PATCH 14/23] hwmon/coretemp: Use RCU to protect access of HK_TYPE_MISC cpumask Waiman Long
2026-04-21 3:03 ` [PATCH 15/23] Drivers: hv: Use RCU to protect access of HK_TYPE_MANAGED_IRQ cpumask Waiman Long
2026-04-21 3:03 ` [PATCH 16/23] genirq/cpuhotplug: " Waiman Long
2026-04-21 9:02 ` Thomas Gleixner
2026-04-21 14:29 ` Waiman Long
2026-04-21 3:03 ` [PATCH 17/23] sched/isolation: Extend housekeeping_dereference_check() to cover changes in nohz_full or manged_irqs cpumasks Waiman Long
2026-04-21 3:03 ` [PATCH 18/23] cpu/hotplug: Add a new cpuhp_offline_cb() API Waiman Long
2026-04-21 16:17 ` Thomas Gleixner
2026-04-21 17:29 ` Waiman Long
2026-04-21 18:43 ` Thomas Gleixner
2026-04-21 3:03 ` [PATCH 19/23] cgroup/cpuset: Improve check for calling housekeeping_update() Waiman Long
2026-04-23 1:10 ` Chen Ridong
2026-04-24 18:32 ` Waiman Long
2026-04-21 3:03 ` [PATCH 20/23] cgroup/cpuset: Enable runtime update of HK_TYPE_{KERNEL_NOISE,MANAGED_IRQ} cpumasks Waiman Long
2026-04-21 3:03 ` [PATCH 21/23] cgroup/cpuset: Limit the side effect of using CPU hotplug on isolated partition Waiman Long
2026-04-21 3:03 ` [PATCH 22/23] cgroup/cpuset: Prevent offline_disabled CPUs from being used in " Waiman Long
2026-04-21 3:03 ` [PATCH 23/23] cgroup/cpuset: Documentation and kselftest updates Waiman Long
2026-06-24 6:34 ` [PATCH-next 00/23] cgroup/cpuset: Enable runtime update of nohz_full and managed_irq CPUs Jing Wu
2026-06-25 5:27 ` Waiman Long
2026-07-01 14:22 ` Frederic Weisbecker [this message]
2026-07-01 18:56 ` Waiman Long
2026-07-02 3:39 ` Jing Wu
2026-07-03 13:19 ` Frederic Weisbecker
2026-07-02 15:00 ` Thomas Gleixner
2026-07-02 23:07 ` Paul E. McKenney
2026-07-03 6:11 ` Jing Wu
2026-07-03 13:45 ` Frederic Weisbecker
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