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([74.48.213.230]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2c159e25dc7sm2786389eec.27.2026.03.25.02.10.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Mar 2026 02:10:26 -0700 (PDT) From: Qiliang Yuan Date: Wed, 25 Mar 2026 17:09:37 +0800 Subject: [PATCH 06/15] sched/core: Dynamically update scheduler domain housekeeping mask 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-v1-6-919cca23cadf@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 Scheduler domains rely on HK_TYPE_DOMAIN to identify which CPUs are isolated from general load balancing. Currently, these boundaries are static and determined only during boot-time domain initialization. Trigger a scheduler domain rebuild when the HK_TYPE_DOMAIN mask changes. This ensures that scheduler isolation boundaries can be reconfigured at runtime via the DHEI sysfs interface. Signed-off-by: Qiliang Yuan --- kernel/sched/core.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 045f83ad261e2..ddf9951f1438c 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -39,6 +39,7 @@ #include #include #include +#include #include #include @@ -10832,3 +10833,25 @@ void sched_change_end(struct sched_change_ctx *ctx) p->sched_class->prio_changed(rq, p, ctx->prio); } } + +static int sched_housekeeping_update(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct housekeeping_update *update = data; + + if (action == HK_UPDATE_MASK && update->type == HK_TYPE_DOMAIN) + rebuild_sched_domains(); + + return NOTIFY_OK; +} + +static struct notifier_block sched_housekeeping_nb = { + .notifier_call = sched_housekeeping_update, +}; + +static int __init sched_housekeeping_init(void) +{ + housekeeping_register_notifier(&sched_housekeeping_nb); + return 0; +} +late_initcall(sched_housekeeping_init); -- 2.43.0