linux-kernel - Re: [PATCH 06/31] cpuset: Convert boot_hk_cpus to use HK_TYPE_DOMAIN

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Message-ID: <7742487a-81e0-430f-8c4d-f1a761c2af98@huaweicloud.com>
Date: Thu, 6 Nov 2025 09:20:26 +0800
From: Chen Ridong <chenridong@...weicloud.com>
To: Frederic Weisbecker <frederic@...nel.org>,
 LKML <linux-kernel@...r.kernel.org>
Cc: 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>, 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: Re: [PATCH 06/31] cpuset: Convert boot_hk_cpus to use
 HK_TYPE_DOMAIN_BOOT

On 2025/11/6 5:03, Frederic Weisbecker wrote:
> boot_hk_cpus is an ad-hoc copy of HK_TYPE_DOMAIN_BOOT. Remove it and use
> the official version.
> 
> Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
> Reviewed-by: Phil Auld <pauld@...hat.com>
> ---
>  kernel/cgroup/cpuset.c | 22 +++++++---------------
>  1 file changed, 7 insertions(+), 15 deletions(-)
> 
> diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
> index 52468d2c178a..8595f1eadf23 100644
> --- a/kernel/cgroup/cpuset.c
> +++ b/kernel/cgroup/cpuset.c
> @@ -81,12 +81,6 @@ static cpumask_var_t	subpartitions_cpus;
>   */
>  static cpumask_var_t	isolated_cpus;
>  
> -/*
> - * Housekeeping (HK_TYPE_DOMAIN) CPUs at boot
> - */
> -static cpumask_var_t	boot_hk_cpus;
> -static bool		have_boot_isolcpus;
> -
>  /* List of remote partition root children */
>  static struct list_head remote_children;
>  
> @@ -1686,15 +1680,16 @@ static void remote_cpus_update(struct cpuset *cs, struct cpumask *xcpus,
>   * @new_cpus: cpu mask
>   * Return: true if there is conflict, false otherwise
>   *
> - * CPUs outside of boot_hk_cpus, if defined, can only be used in an
> + * CPUs outside of HK_TYPE_DOMAIN_BOOT, if defined, can only be used in an
>   * isolated partition.
>   */
>  static bool prstate_housekeeping_conflict(int prstate, struct cpumask *new_cpus)
>  {
> -	if (!have_boot_isolcpus)
> +	if (!housekeeping_enabled(HK_TYPE_DOMAIN_BOOT))
>  		return false;
>  
> -	if ((prstate != PRS_ISOLATED) && !cpumask_subset(new_cpus, boot_hk_cpus))
> +	if ((prstate != PRS_ISOLATED) &&
> +	    !cpumask_subset(new_cpus, housekeeping_cpumask(HK_TYPE_DOMAIN_BOOT)))
>  		return true;
>  
>  	return false;
> @@ -3824,12 +3819,9 @@ int __init cpuset_init(void)
>  
>  	BUG_ON(!alloc_cpumask_var(&cpus_attach, GFP_KERNEL));
>  
> -	have_boot_isolcpus = housekeeping_enabled(HK_TYPE_DOMAIN);
> -	if (have_boot_isolcpus) {
> -		BUG_ON(!alloc_cpumask_var(&boot_hk_cpus, GFP_KERNEL));
> -		cpumask_copy(boot_hk_cpus, housekeeping_cpumask(HK_TYPE_DOMAIN));
> -		cpumask_andnot(isolated_cpus, cpu_possible_mask, boot_hk_cpus);
> -	}
> +	if (housekeeping_enabled(HK_TYPE_DOMAIN_BOOT))
> +		cpumask_andnot(isolated_cpus, cpu_possible_mask,
> +			       housekeeping_cpumask(HK_TYPE_DOMAIN_BOOT));
>  
>  	return 0;
>  }

Reviewed-by: Chen Ridong <chenridong@...wei.com>

-- 
Best regards,
Ridong