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Wed, 17 Jun 2026 20:12:40 -0700 (PDT) From: Jing Wu Date: Thu, 18 Jun 2026 11:11:23 +0800 Subject: [PATCH v3 12/13] docs: cgroup-v2: Document kernel-noise isolation via isolated partitions Precedence: bulk X-Mailing-List: cgroups@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: <20260618-wujing-dhm-v3-12-28f1a4d83b68@gmail.com> References: <20260618-wujing-dhm-v3-0-28f1a4d83b68@gmail.com> In-Reply-To: <20260618-wujing-dhm-v3-0-28f1a4d83b68@gmail.com> To: Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , "Paul E. McKenney" , Frederic Weisbecker , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Uladzislau Rezki , Mathieu Desnoyers , Lai Jiangshan , Zqiang , Anna-Maria Behnsen , Tejun Heo , Jonathan Corbet , Shuah Khan , Shuah Khan , Thomas Gleixner Cc: linux-kernel@vger.kernel.org, rcu@vger.kernel.org, cgroups@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, Jing Wu , Qiliang Yuan X-Mailer: b4 0.13.0 Document that cpuset.cpus.partition=isolated now drives runtime updates of the housekeeping masks for kernel-noise types: nohz_full (tick suppression), RCU NOCB offloading, and managed IRQ migration. No additional cgroupfs files are required; the partition update path automatically triggers explicit housekeeping callbacks for all affected subsystems. Signed-off-by: Jing Wu Signed-off-by: Qiliang Yuan --- Documentation/admin-guide/cgroup-v2.rst | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst index 6efd0095ed995..7c3b048e75cb5 100644 --- a/Documentation/admin-guide/cgroup-v2.rst +++ b/Documentation/admin-guide/cgroup-v2.rst @@ -2721,6 +2721,14 @@ Cpuset Interface Files kernel boot command line option. If those CPUs are to be put into a partition, they have to be used in an isolated partition. + When an isolated partition is created or destroyed, the kernel + automatically drives runtime updates of the housekeeping masks + for kernel-noise types (nohz_full, RCU NOCB, managed IRQ + interrupts). This extends isolation beyond scheduler domains: + the tick is stopped on isolated CPUs, RCU callbacks are + offloaded to housekeeping cores, and managed interrupts are + migrated away. No additional cgroupfs files are required. + Device controller ----------------- -- 2.43.0