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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 16/33] sched/isolation: Flush vmstat workqueues on cpuset isolated partition change Date: Thu, 1 Jan 2026 23:13:41 +0100 Message-ID: <20260101221359.22298-17-frederic@kernel.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20260101221359.22298-1-frederic@kernel.org> References: <20260101221359.22298-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: d6crb7ejsyoju7bxhqxd1t4dqq97y1wr X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 13A3140003 X-Rspam-User: X-HE-Tag: 1767305785-928238 X-HE-Meta: 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 3gpOKGzI Gap2Ok48UWdnEoMEyDUAOSGsof3zbT0e6R+hrOLM1QwceunoykWwREbCYax7Ret5cJfCd/Qa5rVhqFkZwHxZ0CrwV4SK12VI2gXjrvoDWtxEYnouzQSVm9s9vztYaTuItahHx/Ss4zRmfGPfYBtakIL+5U8f5eQPam587Cn2xqgrMNVdVekAlxBzsECBvEkIACPlPjTlw60/kn9ytgX2wyYYcBjY47n4KEjZ5nGSsXNXzlHubmJVPZOUiltUNRPKpx0d7AYeP7QDL8AnmA9HdRIEThTn+FjtkykQexhNRrh8Bhqk= 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 is now modifiable at runtime. In order to synchronize against vmstat workqueue to make sure that no asynchronous vmstat work is still pending or executing on a newly made isolated CPU, the housekeeping susbsystem must flush the vmstat workqueues. This involves flushing the whole mm_percpu_wq workqueue, shared with LRU drain, introducing here a welcome side effect. Signed-off-by: Frederic Weisbecker --- include/linux/vmstat.h | 2 ++ kernel/sched/isolation.c | 1 + kernel/sched/sched.h | 1 + mm/vmstat.c | 5 +++++ 4 files changed, 9 insertions(+) diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h index 3398a345bda8..1909b945b3ea 100644 --- a/include/linux/vmstat.h +++ b/include/linux/vmstat.h @@ -303,6 +303,7 @@ int calculate_pressure_threshold(struct zone *zone); int calculate_normal_threshold(struct zone *zone); void set_pgdat_percpu_threshold(pg_data_t *pgdat, int (*calculate_pressure)(struct zone *)); +void vmstat_flush_workqueue(void); #else /* CONFIG_SMP */ /* @@ -403,6 +404,7 @@ static inline void __dec_node_page_state(struct page *page, static inline void refresh_zone_stat_thresholds(void) { } static inline void cpu_vm_stats_fold(int cpu) { } static inline void quiet_vmstat(void) { } +static inline void vmstat_flush_workqueue(void) { } static inline void drain_zonestat(struct zone *zone, struct per_cpu_zonestat *pzstats) { } diff --git a/kernel/sched/isolation.c b/kernel/sched/isolation.c index b5f9f974eac9..ec3f15164fd1 100644 --- a/kernel/sched/isolation.c +++ b/kernel/sched/isolation.c @@ -143,6 +143,7 @@ int housekeeping_update(struct cpumask *isol_mask) synchronize_rcu(); mem_cgroup_flush_workqueue(); + vmstat_flush_workqueue(); kfree(old); diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 65dfa48e54b7..2d0c408fca0b 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -68,6 +68,7 @@ #include #include #include +#include #include #include #include diff --git a/mm/vmstat.c b/mm/vmstat.c index ed19c0d42de6..d6e814c82952 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -2124,6 +2124,11 @@ static void vmstat_shepherd(struct work_struct *w); static DECLARE_DEFERRABLE_WORK(shepherd, vmstat_shepherd); +void vmstat_flush_workqueue(void) +{ + flush_workqueue(mm_percpu_wq); +} + static void vmstat_shepherd(struct work_struct *w) { int cpu; -- 2.51.1