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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: Wed, 24 Dec 2025 14:44:51 +0100 Message-ID: <20251224134520.33231-5-frederic@kernel.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251224134520.33231-1-frederic@kernel.org> References: <20251224134520.33231-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 0E20314001F X-Stat-Signature: djwr9pj5s8xkd7cgcgrzf9ox7i3h5eih X-Rspam-User: X-HE-Tag: 1766583967-485838 X-HE-Meta: U2FsdGVkX1/4O4r1BVGUM7dZ3aZV+ZAWRxPruf7YgYG5zTLMWmsBR6UfX/RmO6i4pcNij9olsbsByQDakH0iSwTMJWDf3pktWENJnc0JNoJkkbA2RdUDnHJzmVrtf5NfzRLCm7Eq0gEUtDZ9e3b+L5ymKYdkSX7xJ9jZZyN8PyDu18WoKO+KnSBi8daRPkMcH5qNlkKVVRAVSX7pubT63CQ6Ei1Y9I/jcwUj1PQWjSxcO9uv+9TtSMrc5zx5jy3UlOJ/DFVkLJOdAzxfh9RMHgZY/KzRqabL7pcWUeJMXS4mI9M/Y3TY30aEwCeZ/4PnCuVfOlVOWOnmUnHc2mKuz2mnIRoI7ro+2tciTvHE25UA5HbXsNVi3lMtXuZ0xUnIqJQK2rCK6KC9SmpUWELKo8B4WoIddJLljpZqhwaryRwFzW5cUMEIRgfkGube2nhWHcX2/B6cMdhCUvI1JC5uJIFIe21zh719zOgearB0y5hJk4QizpyQW8ZMINoGXXXILDoIemKk9NL/06Zrn1RFFSaAWcdZiuFxogLU1H+bscyT+s+8g5yfJfJzQxY/nDZmEvSZXxGFLUez/namrvxQGORO3kCefrWrbdwYwu5pT/yE9yRyZ4FwrqjivnDdP0TD8JRPgMMyoq3Dp1qUD/J5FGZw3Ja/p8L1yfiZH5ciGBJ/DpNlkkmliy5VwF29doAKpDu0S7CZw3q9++Rc0n4Ll1d5wnP2rEXbioyb4LW4BuYiYtY9VGQJkXQFzlZThiCSnpR0V833yYsLOVSYzc1COcsNFYI6eqblhZvVYrGmtare1Vwm733BXQybQmMIcqyTj2lwfPUSZe+vMchDyE6qy6/QCNe0FYj3D/QJ695sfGf95fu7+saUfWkDn/iGWtgU0Mx0CTFdX97KMSvFcW0yHZ0qRRDmb5PsQyFnKjV8XrEHtB0t4bLid7kh/8VzKEo56wL2fjAfIVaN8wmUV0Y 5ahivDBa RuKcgSbp9EyS6h0R/4obzEe8VMV+s+mPr0xOwk01wOTY8VLD4vMuLaMxx78sDjsPtXt5cuKcQofFWEXyL6BYyo58e73wFq/IoJIu8N40/kuq4eZdUvPP8DWJ9u2f2pRHS2NJvs/HBS1dFE3IefQc2W2l9G/WBm8rIFlnRWTBoaaX3oY3roznocpflthqMyTWhN/Pji7AP55DZctPnkJFsOxhg8y8USEsxdjzYcF2hf/u92pFCrYzsB8GmDZMJgC0vtMLXNNwjgp2T9xw= 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 modifiable 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 65de88cdf40e..ed19c0d42de6 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -2144,11 +2144,13 @@ 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(); } -- 2.51.1