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([74.48.213.230]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2c159e25dc7sm2786389eec.27.2026.03.25.02.10.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Mar 2026 02:10:42 -0700 (PDT) From: Qiliang Yuan Date: Wed, 25 Mar 2026 17:09:39 +0800 Subject: [PATCH 08/15] workqueue: Support dynamic housekeeping mask updates Precedence: bulk X-Mailing-List: rcu@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260325-dhei-v12-final-v1-8-919cca23cadf@gmail.com> References: <20260325-dhei-v12-final-v1-0-919cca23cadf@gmail.com> In-Reply-To: <20260325-dhei-v12-final-v1-0-919cca23cadf@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 , Shuah Khan Cc: linux-kernel@vger.kernel.org, rcu@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, Qiliang Yuan X-Mailer: b4 0.13.0 Unbound workqueues use HK_TYPE_WQ and HK_TYPE_DOMAIN to determine their default CPU affinity. These boundaries are currently static and only enforced during early boot. Implement a housekeeping notifier to update unbound workqueue affinity. This enables unbound workqueue tasks to respect dynamic isolation boundaries at runtime. Signed-off-by: Qiliang Yuan --- kernel/workqueue.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 253311af47c6d..ef3ef7e3fe81f 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -7904,6 +7904,47 @@ static void __init wq_cpu_intensive_thresh_init(void) wq_cpu_intensive_thresh_us = thresh; } +static int wq_housekeeping_reconfigure(struct notifier_block *nb, + unsigned long action, void *data) +{ + if (action == HK_UPDATE_MASK) { + struct housekeeping_update *upd = data; + unsigned int type = upd->type; + + if (type == HK_TYPE_WQ || type == HK_TYPE_DOMAIN) { + cpumask_var_t cpumask; + + if (!alloc_cpumask_var(&cpumask, GFP_KERNEL)) { + pr_warn("workqueue: failed to allocate cpumask for housekeeping update\n"); + return NOTIFY_BAD; + } + + cpumask_copy(cpumask, cpu_possible_mask); + if (!cpumask_empty(housekeeping_cpumask(HK_TYPE_WQ))) + cpumask_and(cpumask, cpumask, housekeeping_cpumask(HK_TYPE_WQ)); + if (!cpumask_empty(housekeeping_cpumask(HK_TYPE_DOMAIN))) + cpumask_and(cpumask, cpumask, housekeeping_cpumask(HK_TYPE_DOMAIN)); + + workqueue_set_unbound_cpumask(cpumask); + + if (type == HK_TYPE_DOMAIN) { + apply_wqattrs_lock(); + cpumask_andnot(wq_isolated_cpumask, cpu_possible_mask, + housekeeping_cpumask(HK_TYPE_DOMAIN)); + apply_wqattrs_unlock(); + } + + free_cpumask_var(cpumask); + } + } + + return NOTIFY_OK; +} + +static struct notifier_block wq_housekeeping_nb = { + .notifier_call = wq_housekeeping_reconfigure, +}; + /** * workqueue_init - bring workqueue subsystem fully online * @@ -7964,6 +8005,7 @@ void __init workqueue_init(void) wq_online = true; wq_watchdog_init(); + housekeeping_register_notifier(&wq_housekeeping_nb); } /* -- 2.43.0