linux-kernel - Re: [PATCH/for-next v4 3/4] cgroup/cpuset: Call housekeeping_update() without holding cpus_read

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Message-ID: <67f4b01a-7b23-49c2-a8db-059316300d39@redhat.com>
Date: Mon, 9 Feb 2026 15:20:51 -0500
From: Waiman Long <llong@...hat.com>
To: Chen Ridong <chenridong@...weicloud.com>, Tejun Heo <tj@...nel.org>,
 Johannes Weiner <hannes@...xchg.org>, Michal Koutný
 <mkoutny@...e.com>, Ingo Molnar <mingo@...hat.com>,
 Peter Zijlstra <peterz@...radead.org>, Juri Lelli <juri.lelli@...hat.com>,
 Vincent Guittot <vincent.guittot@...aro.org>,
 Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>,
 Mel Gorman <mgorman@...e.de>, Valentin Schneider <vschneid@...hat.com>,
 Anna-Maria Behnsen <anna-maria@...utronix.de>,
 Frederic Weisbecker <frederic@...nel.org>,
 Thomas Gleixner <tglx@...utronix.de>, Shuah Khan <shuah@...nel.org>
Cc: cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-kselftest@...r.kernel.org
Subject: Re: [PATCH/for-next v4 3/4] cgroup/cpuset: Call housekeeping_update()
 without holding cpus_read_lock

On 2/9/26 2:23 AM, Chen Ridong wrote:
>
> On 2026/2/7 4:37, Waiman Long wrote:
>> +static cpumask_var_t	isolated_hk_cpus;	/* T */
> Can we get this from isolation.c instead?
>
> The name probably shouldn't include 'hk', since it refers to the inverse
> (housekeeping CPUs) of isolated CPUs, right?

The housekeeping_update() will create an inverse of the pass-in isolated 
cpumasks. As for the name, I add hk to indicate this cpumask is for 
passing to housekeeping_update() to update housekeeping cpumask. It is 
not directly related to the cpumasks in sched/isolation.c. Please let me 
know if you have  a suggestion for the name.

Cheers,
Longman