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Mon, 30 Mar 2026 04:46:19 -0700 (PDT) From: Qiliang Yuan To: peterz@infradead.org Cc: longman@redhat.com, cgroups@vger.kernel.org, akpm@linux-foundation.org, anna-maria@linutronix.de, boqun.feng@gmail.com, bsegall@google.com, dietmar.eggemann@arm.com, frederic@kernel.org, hannes@cmpxchg.org, jackmanb@google.com, jiangshanlai@gmail.com, joelagnelf@nvidia.com, josh@joshtriplett.org, juri.lelli@redhat.com, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, mathieu.desnoyers@efficios.com, mgorman@suse.de, mhocko@suse.com, mingo@kernel.org, mingo@redhat.com, neeraj.upadhyay@kernel.org, paulmck@kernel.org, qiang.zhang@linux.dev, rcu@vger.kernel.org, realwujing@gmail.com, rostedt@goodmis.org, shuah@kernel.org, surenb@google.com, tglx@kernel.org, tj@kernel.org, urezki@gmail.com, vbabka@suse.cz, vincent.guittot@linaro.org, vschneid@redhat.com, ziy@nvidia.com Subject: Re: [PATCH 07/15] watchdog: Allow runtime toggle of lockup detector affinity Date: Mon, 30 Mar 2026 19:45:46 +0800 Message-ID: <20260330114546.103726-1-realwujing@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260325140324.GD3738786@noisy.programming.kicks-ass.net> References: <20260325140324.GD3738786@noisy.programming.kicks-ass.net> Precedence: bulk X-Mailing-List: cgroups@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On Wed, Mar 25, 2026 at 03:03:24PM +0100, Peter Zijlstra wrote: > Why would we want to toggle the watchdog? It's linked to the > TIMER housekeeping type anyway, right? Yes, it is. The original patch had an independent toggle that felt redundant to you, and I agree. The watchdog affinity follows the timer housekeeping state. I'll simplify this by removing the custom toggle and making it a guaranteed side-effect of the global housekeeping state update. This keeps the configuration simple while still achieving the goal of keeping the isolated cores completely clean during dynamic changes.