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Miller" , Eric Dumazet , Gabriele Monaco , Greg Kroah-Hartman , Ingo Molnar , Jakub Kicinski , Jens Axboe , Johannes Weiner , Lai Jiangshan , Marco Crivellari , Michal Hocko , Muchun Song , Paolo Abeni , Peter Zijlstra , Phil Auld , "Rafael J . Wysocki" , Roman Gushchin , Shakeel Butt , Simon Horman , Tejun Heo , Thomas Gleixner , Vlastimil Babka , Waiman Long , Will Deacon , cgroups@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-block@vger.kernel.org, linux-mm@kvack.org, linux-pci@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH 04/33] mm: vmstat: Prepare to protect against concurrent isolated cpuset change Date: Mon, 13 Oct 2025 22:31:17 +0200 Message-ID: <20251013203146.10162-5-frederic@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251013203146.10162-1-frederic@kernel.org> References: <20251013203146.10162-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: C63DC4000C X-Rspamd-Server: rspam11 X-Rspam-User: X-Stat-Signature: gah65n5ny1iu77m1fd4kcutqn5kdyyyr X-HE-Tag: 1760387549-39580 X-HE-Meta: U2FsdGVkX19RgbRFWHEj24L+cb2ytH6ymwxa0DcSsM7SWHzODZugxkDKYxl2QQYA6D1ICnD+Zx4EiQxqXG1TQC8EZtAfcBprl5Va4JKHXBGojgUreFpNT3QF8SJm6BaluKv8rzceZCGnmD9SUdsjRyIe50eFdwoyM0dKQt9XpzXZC9xw3Q+CXgTyQDJuLHqOjgkznQ4eFot2nT8kwg+jWUZpMogt+h/+qqfnePdtfjZ1ENuDKhXQJWxPIojYAo+aYK1Tvx0WiFiUIjJ1xmO1aNroLFDBT7zEjhhipNCYMUuZXrbJah16oGIzRcMLqyGgoeaqksjhBZ4hjIJsnwWhSXG4RC+9GD+wLPzC101ygpSj5rwfQ/RkUxKdt+5Ri1MwgqQ4Zwn5QMwTrslYb96EV9d6uzHPdrga2WE28nHtxoCychdbdyJpTDpwNHSiZyaI6+amZ+YorFv18Bu3FnPrlm0H00jB7BJsriCAWDhFAFYZ3/44bexUNzeSprg/p1DaGYMDIXt6FjQSzXVnSh6xPvgLvZkeZZ9MpmyDlSXNK+l99OtEjQ78jA5s+WApHxRewJLbiPx6Hzi/OnXVAO5zcI5/5BGVZUQteIZ/6jq9ZalIp2hOsCbRI66J1PmedyDPIQEHU2jcxhqeqKW3xUmKqqS6OYoeXk8P7ztqUmeVZHU3rsPu5svAPo4QEHFWJ1jq1I2c7WEnP9Q086NhWoFQJbdnXe/ZiC4iex/8938zXnSu0CoA01KCXddSgbesE9P1oaQE3t0kYRRLLHkKKKEpNHOx82HH0XXPBuDk4Q1OD7agxtcKpVkRZBHDFW9nj3MTA5f4n4O/C/Uc2jcjLHZGBjXwepA3D638xujoAGqQ9m1044U6+sYH8fY7FVgB+3WVwOFpr5jW3ruDKY/VbtCK9g== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The HK_TYPE_DOMAIN housekeeping cpumask will soon be made modifyable at runtime. In order to synchronize against vmstat workqueue to make sure that no asynchronous vmstat work is pending or executing on a newly made isolated CPU, target and queue a vmstat work under the same RCU read side critical section. Whenever housekeeping will update the HK_TYPE_DOMAIN cpumask, a vmstat workqueue flush will also be issued in a further change to make sure that no work remains pending after a CPU has been made isolated. Signed-off-by: Frederic Weisbecker --- mm/vmstat.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/mm/vmstat.c b/mm/vmstat.c index bb09c032eecf..7afb2981501f 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -2135,11 +2135,13 @@ static void vmstat_shepherd(struct work_struct *w) * infrastructure ever noticing. Skip regular flushing from vmstat_shepherd * for all isolated CPUs to avoid interference with the isolated workload. */ - if (cpu_is_isolated(cpu)) - continue; + scoped_guard(rcu) { + if (cpu_is_isolated(cpu)) + continue; - if (!delayed_work_pending(dw) && need_update(cpu)) - queue_delayed_work_on(cpu, mm_percpu_wq, dw, 0); + if (!delayed_work_pending(dw) && need_update(cpu)) + queue_delayed_work_on(cpu, mm_percpu_wq, dw, 0); + } cond_resched(); } -- 2.51.0