linux-kernel - Re: [PATCH 14/33] sched/isolation: Flush memcg workqueues on cpuset isolated partition change

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Message-ID: <aQt4jT9qqP_l_ZSF@localhost.localdomain>
Date: Wed, 5 Nov 2025 17:17:17 +0100
From: Frederic Weisbecker <frederic@...nel.org>
To: Waiman Long <llong@...hat.com>
Cc: LKML <linux-kernel@...r.kernel.org>,
	Michal Koutný <mkoutny@...e.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Catalin Marinas <catalin.marinas@....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>, 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: Re: [PATCH 14/33] sched/isolation: Flush memcg workqueues on cpuset
 isolated partition change

Le Tue, Oct 21, 2025 at 03:16:45PM -0400, Waiman Long a écrit :
> > @@ -5134,6 +5141,9 @@ int __init mem_cgroup_init(void)
> >   	cpuhp_setup_state_nocalls(CPUHP_MM_MEMCQ_DEAD, "mm/memctrl:dead", NULL,
> >   				  memcg_hotplug_cpu_dead);
> > +	memcg_wq = alloc_workqueue("memcg", 0, 0);
> 
> Should we explicitly mark the memcg_wq as WQ_PERCPU even though I think
> percpu is the default. The schedule_work_on() schedules work on the
> system_percpu_wq.

Good catch, percpu is the default but that behaviour is scheduled for
deprecation. I'm adding WQ_PERCPU.

Thanks!

-- 
Frederic Weisbecker
SUSE Labs