netdev - Re: [PATCH 05/33] sched/isolation: Save boot defined domain flags

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Message-ID: <c1cac1a6-22fe-479f-bfc5-89a5d3aabda5@redhat.com>
Date: Mon, 12 Jan 2026 13:03:47 -0500
From: Waiman Long <llong@...hat.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>,
 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>, 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 05/33] sched/isolation: Save boot defined domain flags

On 1/1/26 5:13 PM, Frederic Weisbecker wrote:
> HK_TYPE_DOMAIN will soon integrate not only boot defined isolcpus= CPUs
> but also cpuset isolated partitions.
>
> Housekeeping still needs a way to record what was initially passed
> to isolcpus= in order to keep these CPUs isolated after a cpuset
> isolated partition is modified or destroyed while containing some of
> them.
>
> Create a new HK_TYPE_DOMAIN_BOOT to keep track of those.
>
> Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
> Reviewed-by: Phil Auld <pauld@...hat.com>
> ---
>   include/linux/sched/isolation.h | 4 ++++
>   kernel/sched/isolation.c        | 5 +++--
>   2 files changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h
> index d8501f4709b5..c7cf6934489c 100644
> --- a/include/linux/sched/isolation.h
> +++ b/include/linux/sched/isolation.h
> @@ -7,8 +7,12 @@
>   #include <linux/tick.h>
>   
>   enum hk_type {
> +	/* Inverse of boot-time isolcpus= argument */
> +	HK_TYPE_DOMAIN_BOOT,
>   	HK_TYPE_DOMAIN,
> +	/* Inverse of boot-time isolcpus=managed_irq argument */
>   	HK_TYPE_MANAGED_IRQ,
> +	/* Inverse of boot-time nohz_full= or isolcpus=nohz arguments */
>   	HK_TYPE_KERNEL_NOISE,
>   	HK_TYPE_MAX,
>   
> diff --git a/kernel/sched/isolation.c b/kernel/sched/isolation.c
> index 3ad0d6df6a0a..11a623fa6320 100644
> --- a/kernel/sched/isolation.c
> +++ b/kernel/sched/isolation.c
> @@ -11,6 +11,7 @@
>   #include "sched.h"
>   
>   enum hk_flags {
> +	HK_FLAG_DOMAIN_BOOT	= BIT(HK_TYPE_DOMAIN_BOOT),
>   	HK_FLAG_DOMAIN		= BIT(HK_TYPE_DOMAIN),
>   	HK_FLAG_MANAGED_IRQ	= BIT(HK_TYPE_MANAGED_IRQ),
>   	HK_FLAG_KERNEL_NOISE	= BIT(HK_TYPE_KERNEL_NOISE),
> @@ -239,7 +240,7 @@ static int __init housekeeping_isolcpus_setup(char *str)
>   
>   		if (!strncmp(str, "domain,", 7)) {
>   			str += 7;
> -			flags |= HK_FLAG_DOMAIN;
> +			flags |= HK_FLAG_DOMAIN | HK_FLAG_DOMAIN_BOOT;
>   			continue;
>   		}
>   
> @@ -269,7 +270,7 @@ static int __init housekeeping_isolcpus_setup(char *str)
>   
>   	/* Default behaviour for isolcpus without flags */
>   	if (!flags)
> -		flags |= HK_FLAG_DOMAIN;
> +		flags |= HK_FLAG_DOMAIN | HK_FLAG_DOMAIN_BOOT;
>   
>   	return housekeeping_setup(str, flags);
>   }
Reviewed-by: Waiman Long <longman@...hat.com>