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Thu, 05 Feb 2026 23:05:26 -0800 (PST) Received: from [127.0.1.1] ([74.48.213.230]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-127041e61b9sm1592601c88.8.2026.02.05.23.05.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Feb 2026 23:05:26 -0800 (PST) From: Qiliang Yuan Date: Fri, 06 Feb 2026 02:04:24 -0500 Subject: [PATCH RFC 03/12] genirq: Implement dynamic migration for Managed IRQs MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260206-feature-dynamic_isolcpus_dhei-v1-3-00a711eb0c74@gmail.com> References: <20260206-feature-dynamic_isolcpus_dhei-v1-0-00a711eb0c74@gmail.com> In-Reply-To: <20260206-feature-dynamic_isolcpus_dhei-v1-0-00a711eb0c74@gmail.com> To: Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Thomas Gleixner , "Paul E. McKenney" , Frederic Weisbecker , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Uladzislau Rezki , Mathieu Desnoyers , Lai Jiangshan , Zqiang , Tejun Heo , Andrew Morton , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , Anna-Maria Behnsen , Ingo Molnar Cc: linux-kernel@vger.kernel.org, rcu@vger.kernel.org, linux-mm@kvack.org, Qiliang Yuan , Qiliang Yuan X-Mailer: b4 0.14.3 X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 388A620003 X-Stat-Signature: rm8gk9gh6hb564ebycmg6ckzxai5ngk4 X-Rspam-User: X-HE-Tag: 1770361528-187901 X-HE-Meta: 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 QiH+DdPd FK0u/Y/rsN4E7fa8B9taRA9DD/I3vrsMMS+HHBa2Fle1VDnwJKBfCA3mXF7kmHR+Z8ahwrR8H/mWmqV9Ek1zsYYZQDQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Support dynamic reconfiguration of CPU isolation by making the managed interrupts responsive to housekeeping mask changes at runtime. 1. Register a housekeeping notifier in the genirq subsystem to listen for HK_TYPE_MANAGED_IRQ updates. 2. Iterate through all active interrupts when a mask update occurs. 3. Re-apply affinity for managed interrupts to ensure they honor the newly configured housekeeping mask. 4. Use irq_set_affinity_locked() to trigger migration away from newly isolated CPUs or towards newly designated housekeeping CPUs. Signed-off-by: Qiliang Yuan Signed-off-by: Qiliang Yuan --- kernel/irq/manage.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 349ae7979da0..9523f0655b12 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -21,6 +21,7 @@ #include #include #include +#include #include "internals.h" @@ -2811,3 +2812,54 @@ bool irq_check_status_bit(unsigned int irq, unsigned int bitmask) return res; } EXPORT_SYMBOL_GPL(irq_check_status_bit); + +#ifdef CONFIG_SMP +static int irq_housekeeping_reconfigure(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct housekeeping_update *upd = data; + struct irq_desc *desc; + unsigned int irq; + + if (action != HK_UPDATE_MASK || upd->type != HK_TYPE_MANAGED_IRQ) + return NOTIFY_OK; + + irq_lock_sparse(); + for_each_active_irq(irq) { + struct irq_data *id; + + desc = irq_to_desc(irq); + if (!desc) + continue; + + scoped_guard(raw_spinlock_irqsave, &desc->lock) { + id = irq_desc_get_irq_data(desc); + if (!irqd_affinity_is_managed(id) || !desc->action || + !irq_data_get_irq_chip(id)) + continue; + + /* + * Re-apply existing affinity to honor the new + * housekeeping mask via __irq_set_affinity() logic. + */ + irq_set_affinity_locked(id, irq_data_get_affinity_mask(id), false); + } + } + irq_unlock_sparse(); + + return NOTIFY_OK; +} + +static struct notifier_block irq_housekeeping_nb = { + .notifier_call = irq_housekeeping_reconfigure, +}; + +static int __init irq_init_housekeeping_notifier(void) +{ + housekeeping_register_notifier(&irq_housekeeping_nb); + return 0; +} +core_initcall(irq_init_housekeeping_notifier); +#endif + + -- 2.51.0