From: Thomas Gleixner <tglx@kernel.org>
To: Jing Wu <realwujing@gmail.com>, 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>,
Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
Valentin Schneider <vschneid@redhat.com>,
"Paul E. McKenney" <paulmck@kernel.org>,
Frederic Weisbecker <frederic@kernel.org>,
Neeraj Upadhyay <neeraj.upadhyay@kernel.org>,
Joel Fernandes <joelagnelf@nvidia.com>,
Josh Triplett <josh@joshtriplett.org>,
Boqun Feng <boqun@kernel.org>,
Uladzislau Rezki <urezki@gmail.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Lai Jiangshan <jiangshanlai@gmail.com>,
Zqiang <qiang.zhang@linux.dev>,
Anna-Maria Behnsen <anna-maria@linutronix.de>,
Tejun Heo <tj@kernel.org>, Jonathan Corbet <corbet@lwn.net>,
Shuah Khan <skhan@linuxfoundation.org>,
Shuah Khan <shuah@kernel.org>
Cc: linux-kernel@vger.kernel.org, rcu@vger.kernel.org,
cgroups@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kselftest@vger.kernel.org, Jing Wu <realwujing@gmail.com>,
Qiliang Yuan <yuanql9@chinatelecom.cn>
Subject: Re: [PATCH v3 05/13] cpu/hotplug: Reserve CPUHP states for nohz_full and managed IRQ down-paths
Date: Thu, 18 Jun 2026 18:06:40 +0200 [thread overview]
Message-ID: <871pe3de9b.ffs@fw13> (raw)
In-Reply-To: <20260618-wujing-dhm-v3-5-28f1a4d83b68@gmail.com>
On Thu, Jun 18 2026 at 11:11, Jing Wu wrote:
> Add CPUHP_AP_NO_HZ_FULL_DYING and CPUHP_AP_IRQ_AFFINITY_DYING to the
> cpuhp_state enum. These dying callbacks are invoked during CPU offline
> before the tick is stopped, enabling clean tick handover and managed
> IRQ migration when a CPU transitions between isolated and housekeeping
> states.
>
> The existing CPUHP_AP_IRQ_AFFINITY_ONLINE already handles managed IRQ
> restoration on CPU online. The new dying callback completes the pair,
> migrating managed interrupts away from the CPU before it goes down.
What? They are migrated away today already when the CPU goes down unless
the CPU is the last one in the affinity set of the interrupt. So why do
you need a new step for something which already exists?
> Subsequent patches register handlers for these states.
>
> Signed-off-by: Jing Wu <realwujing@gmail.com>
> Signed-off-by: Qiliang Yuan <yuanql9@chinatelecom.cn>
This SOB chain is broken (in all patches). See Documentation/process/...
Thanks,
tglx
next prev parent reply other threads:[~2026-06-18 16:06 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-18 3:11 [PATCH v3 00/13] Dynamic Housekeeping Management (DHM) via CPUSets Jing Wu
2026-06-18 3:11 ` [PATCH v3 01/13] sched/isolation: Replace notifier chain with explicit callback interface Jing Wu
2026-06-18 3:11 ` [PATCH v3 02/13] sched/isolation: Add housekeeping_update_types() for kernel-noise masks Jing Wu
2026-06-18 3:11 ` [PATCH v3 03/13] sched/isolation: RCU-protect all housekeeping cpumask readers Jing Wu
2026-06-18 3:11 ` [PATCH v3 04/13] sched/isolation: Fix RCU protection for runtime-mutable cpumask callers Jing Wu
2026-06-18 3:11 ` [PATCH v3 05/13] cpu/hotplug: Reserve CPUHP states for nohz_full and managed IRQ down-paths Jing Wu
2026-06-18 16:06 ` Thomas Gleixner [this message]
2026-06-18 3:11 ` [PATCH v3 06/13] tick/nohz, context_tracking: Prepare for runtime nohz_full updates Jing Wu
2026-06-18 17:27 ` Thomas Gleixner
2026-06-18 19:49 ` Thomas Gleixner
2026-06-18 3:11 ` [PATCH v3 07/13] rcu/nocb: Add explicit housekeeping callback for runtime NOCB toggling Jing Wu
2026-06-18 3:11 ` [PATCH v3 08/13] genirq: Add explicit housekeeping callback for managed IRQ migration Jing Wu
2026-06-18 20:27 ` Thomas Gleixner
2026-06-18 3:11 ` [PATCH v3 09/13] watchdog/lockup_detector: Register housekeeping callback for kernel-noise Jing Wu
2026-06-18 3:11 ` [PATCH v3 10/13] sched: Guard sched_tick_start/stop against uninitialized tick_work_cpu Jing Wu
2026-06-18 20:50 ` Thomas Gleixner
2026-06-18 3:11 ` [PATCH v3 11/13] cgroup/cpuset: Extend isolated partition to trigger kernel-noise isolation Jing Wu
2026-06-18 20:55 ` Thomas Gleixner
2026-06-18 3:11 ` [PATCH v3 12/13] docs: cgroup-v2: Document kernel-noise isolation via isolated partitions Jing Wu
2026-06-18 3:11 ` [PATCH v3 13/13] selftests/cgroup: Add kernel-noise isolation test to cpuset selftest Jing Wu
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