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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 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 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 525E280003 X-Stat-Signature: 6q58rhknrpwkdn1nminxt8zb5yt3k7fw X-Rspam-User: X-HE-Tag: 1774429844-12360 X-HE-Meta: U2FsdGVkX1+8Dh92bE3fQ76a3Jeho/yjFO4Dr/iOuccxitYqijr3eGe1AQqSkOYUmoi4cv2VcKaOK/70Huvvyg8bv9redANAoz3bX8YoNLnrznhN8VQot4854gQUPE2b5TADLqMDLuD/7odcBAjkcswYrqG+cD1oZknG5D2jyuHq70RTy60iKp9MTrQcseFhZ4y2YmCIptJdYIRHJGxB1A2nusllujBcLISA+Vo7JPmtYk+F4nig+MEiLkCAGes+p64S2uxTZJpeSrimwP03ebTcWcBYXNSZNYYEgZkyGa7uqsJzTDcGFUQON5HXAKCvIHpvId4RPpASqk5DoUHEMZGMkgxY42WSyIgfrlHV/aC7WaQfVgwNrtV9+QAc8AkUbZ7nAkqL6zTYBsi8BMiEkOlAFv3+mm3qJ9otyznHwJOP5QczNjjrFsHEJUs55aE1U0TC+lsEW2NKWsxEoRpQgV7p/UrfdQApmB4D8YsMHxSLaNHmPobQTDJxEDia5PgyAB8O9N6s+hnVUPgAQzm31qPqda/F7irImDhHcsWzoRe0HhWXqX2vWvNlzb2hb4zL6SXk6vBxZfLxinzuKlBrxY0ZFwCZZwpi+WoNOeJewioYUtkfPrTReoVKmZdZLZVSkxrSK10uUMK8jgpq5k+feHz5Ha0Z6ABtWUMqXCyEnXj71N96oov5xbm/5a38UAeaJjqWezMFDpw1ODN+AbuUmZCHbk3ybhCaO1iBU+EHGf8FbA+AKiy4ZDVMSnW8bWL6s+CKtF2mrs17hIaEkKe6tSuCZU6H1YlyK4S0uMXfnNM7uQjt/6xaE23nEUAhVb344dpldHhD8d0BaT+D4KkFsXz0EXdEYYB0TtLA5SV0QZcZhR3SZP0I530Oo4bmr3MK/EvHe3uH03Lo1bePibLGU3MnDSwE0VqOrOS1gLiZrwg3oDuqGvK1JPiHq4/c5HnZzYdplDoDdAEnm8QY1PQ cY3qoTuJ 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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