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([74.48.213.230]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2c159e25dc7sm2786389eec.27.2026.03.25.02.10.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Mar 2026 02:10:34 -0700 (PDT) From: Qiliang Yuan Date: Wed, 25 Mar 2026 17:09:38 +0800 Subject: [PATCH 07/15] watchdog: Allow runtime toggle of lockup detector affinity MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260325-dhei-v12-final-v1-7-919cca23cadf@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: rspam12 X-Stat-Signature: i6zdb9mr5psxs66qq9h5xyxfbzm9o4gh X-Rspamd-Queue-Id: 7AA74140009 X-Rspam-User: X-HE-Tag: 1774429836-439444 X-HE-Meta: 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 +9zDfKqp 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The hardlockup detector threads are affined to CPUs based on the HK_TYPE_TIMER housekeeping mask at boot. If this mask is updated at runtime, these threads remain on their original CPUs, potentially running on isolated cores. Synchronize watchdog thread affinity with HK_TYPE_TIMER updates. This ensures that hardlockup detector threads correctly follow the dynamic housekeeping boundaries for timers. Signed-off-by: Qiliang Yuan --- kernel/watchdog.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/kernel/watchdog.c b/kernel/watchdog.c index 366122f4a0f87..ef93795729697 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -26,6 +26,7 @@ #include #include #include +#include #include #include @@ -1359,6 +1360,29 @@ static int __init lockup_detector_check(void) } late_initcall_sync(lockup_detector_check); +static int watchdog_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_TIMER) { + mutex_lock(&watchdog_mutex); + cpumask_copy(&watchdog_cpumask, + housekeeping_cpumask(HK_TYPE_TIMER)); + proc_watchdog_update(false); + mutex_unlock(&watchdog_mutex); + } + } + + return NOTIFY_OK; +} + +static struct notifier_block watchdog_housekeeping_nb = { + .notifier_call = watchdog_housekeeping_reconfigure, +}; + void __init lockup_detector_init(void) { if (tick_nohz_full_enabled()) @@ -1373,4 +1397,5 @@ void __init lockup_detector_init(void) allow_lockup_detector_init_retry = true; lockup_detector_setup(); + housekeeping_register_notifier(&watchdog_housekeeping_nb); } -- 2.43.0