linux-kernel - [PATCH 19/33] cpuset: Propagate cpuset isolation update to timers through housekeeping

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Message-ID: <20251224134520.33231-20-frederic@kernel.org>
Date: Wed, 24 Dec 2025 14:45:06 +0100
From: Frederic Weisbecker <frederic@...nel.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Frederic Weisbecker <frederic@...nel.org>,
	Michal Koutný <mkoutny@...e.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Chen Ridong <chenridong@...wei.com>,
	Danilo Krummrich <dakr@...nel.org>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Gabriele Monaco <gmonaco@...hat.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Jens Axboe <axboe@...nel.dk>,
	Johannes Weiner <hannes@...xchg.org>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Marco Crivellari <marco.crivellari@...e.com>,
	Michal Hocko <mhocko@...e.com>,
	Muchun Song <muchun.song@...ux.dev>,
	Paolo Abeni <pabeni@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Phil Auld <pauld@...hat.com>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Shakeel Butt <shakeel.butt@...ux.dev>,
	Simon Horman <horms@...nel.org>,
	Tejun Heo <tj@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Vlastimil Babka <vbabka@...e.cz>,
	Waiman Long <longman@...hat.com>,
	Will Deacon <will@...nel.org>,
	cgroups@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-block@...r.kernel.org,
	linux-mm@...ck.org,
	linux-pci@...r.kernel.org,
	netdev@...r.kernel.org
Subject: [PATCH 19/33] cpuset: Propagate cpuset isolation update to timers through housekeeping

Until now, cpuset would propagate isolated partition changes to
timer migration so that unbound timers don't get migrated to isolated
CPUs.

Since housekeeping now centralizes, synchronize and propagates isolation
cpumask changes, perform the work from that subsystem for consolidation
and consistency purposes.

Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
---
 kernel/cgroup/cpuset.c   | 3 ---
 kernel/sched/isolation.c | 5 +++++
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index a492d23dd622..25ac6c98113c 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -1487,9 +1487,6 @@ static void update_isolation_cpumasks(void)
 	ret = housekeeping_update(isolated_cpus, HK_TYPE_DOMAIN);
 	WARN_ON_ONCE(ret < 0);
 
-	ret = tmigr_isolated_exclude_cpumask(isolated_cpus);
-	WARN_ON_ONCE(ret < 0);
-
 	isolated_cpus_updating = false;
 }
 
diff --git a/kernel/sched/isolation.c b/kernel/sched/isolation.c
index d224bca299ed..84a257d05918 100644
--- a/kernel/sched/isolation.c
+++ b/kernel/sched/isolation.c
@@ -150,7 +150,12 @@ int housekeeping_update(struct cpumask *isol_mask, enum hk_type type)
 	pci_probe_flush_workqueue();
 	mem_cgroup_flush_workqueue();
 	vmstat_flush_workqueue();
+
 	err = workqueue_unbound_housekeeping_update(housekeeping_cpumask(type));
+	WARN_ON_ONCE(err < 0);
+
+	err = tmigr_isolated_exclude_cpumask(isol_mask);
+	WARN_ON_ONCE(err < 0);
 
 	kfree(old);
 
-- 
2.51.1