linux-kernel - Re: [PATCH 06/33] sched/isolation: Save boot defined domain flags

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Message-ID: <20250911210247.GB7235@pauld.westford.csb>
Date: Thu, 11 Sep 2025 17:02:47 -0400
From: Phil Auld <pauld@...hat.com>
To: Frederic Weisbecker <frederic@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...hat.com>,
	Marco Crivellari <marco.crivellari@...e.com>,
	Michal Hocko <mhocko@...e.com>,
	Peter Zijlstra <peterz@...radead.org>, Tejun Heo <tj@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Vlastimil Babka <vbabka@...e.cz>, Waiman Long <longman@...hat.com>
Subject: Re: [PATCH 06/33] sched/isolation: Save boot defined domain flags

On Fri, Aug 29, 2025 at 05:47:47PM +0200 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 | 1 +
>  kernel/sched/isolation.c        | 5 +++--
>  2 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h
> index f98ba0d71c52..9262378760b1 100644
> --- a/include/linux/sched/isolation.h
> +++ b/include/linux/sched/isolation.h
> @@ -7,6 +7,7 @@
>  #include <linux/tick.h>
>  
>  enum hk_type {
> +	HK_TYPE_DOMAIN_BOOT,
>  	HK_TYPE_DOMAIN,
>  	HK_TYPE_MANAGED_IRQ,
>  	HK_TYPE_KERNEL_NOISE,
> diff --git a/kernel/sched/isolation.c b/kernel/sched/isolation.c
> index 2a6fc6fc46fb..fb414e28706d 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),
> @@ -204,7 +205,7 @@ 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;
>  		}
>  
> @@ -234,7 +235,7 @@ 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);
>  }
> -- 
> 2.51.0
> 
> 

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