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b=JBCCVwqSjumn7XT4pVDMZEQLI5ogqSOLLqGspHQDWXhvD0P1ULdzN5pTeo2YYyls9 R1X0QNhPHFsw7zRULaD26WedF9faUpfaOdmDue3V+AlLjmpiuVjqW6ACLSQh0SNmbr dsb63Wt0czGmui5C6jv6RImZDkq7MhoITNU7+llg+qFQy+uOOTL0n6jNdOXsVzugv5 onzVLJ0B+qvls4RBWOQ5FmzyvIUvBjo6pcO4XanBU+cvUhEGyDwWroQcN/+opq93XB hNCXxaTRCVJ94BZun8eg+Rl+qFXPj1mkU88P5VcLTsoRIioeEpdrZpQDgXZhpkmvMe vvWARYaBRDQGQ== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Andrew Morton , Marco Crivellari , Michal Hocko , Peter Zijlstra , Tejun Heo , Thomas Gleixner , Vlastimil Babka , Waiman Long , linux-mm@kvack.org Subject: [PATCH 05/33] mm: vmstat: Prepare to protect against concurrent isolated cpuset change Date: Fri, 29 Aug 2025 17:47:46 +0200 Message-ID: <20250829154814.47015-6-frederic@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250829154814.47015-1-frederic@kernel.org> References: <20250829154814.47015-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 32B93100011 X-Stat-Signature: w3ifu1fhh9nbhbkgp5gyuxo5daj9rjtk X-Rspam-User: X-HE-Tag: 1756482515-4988 X-HE-Meta: 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 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 71cd1ceba191..b90325ee49d3 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -2133,11 +2133,13 @@ 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