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

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Message-ID: <aVUo-csI1gqZL89O@localhost.localdomain>
Date: Wed, 31 Dec 2025 14:45:29 +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>,
	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

Le Thu, Dec 25, 2025 at 05:27:54PM -0500, Waiman Long a écrit :
> On 12/24/25 8:44 AM, 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..109a2149e21a 100644
> > --- a/include/linux/sched/isolation.h
> > +++ b/include/linux/sched/isolation.h
> > @@ -7,8 +7,12 @@
> >   #include <linux/tick.h>
> >   enum hk_type {
> > +	/* Revert of boot-time isolcpus= argument */
> > +	HK_TYPE_DOMAIN_BOOT,
> >   	HK_TYPE_DOMAIN,
> > +	/* Revert of boot-time isolcpus=managed_irq argument */
> >   	HK_TYPE_MANAGED_IRQ,
> > +	/* Revert of boot-time nohz_full= or isolcpus=nohz arguments */
> >   	HK_TYPE_KERNEL_NOISE,
> >   	HK_TYPE_MAX,
> 
> "Revert" is a verb. The term "Revert of" sound strange to me. I think using
> "Inverse of" will sound better.

Somehow I thought it could be a noun as well. At least I wouldn't mind if
it ever turns that way.

Fixing that, thanks.

> 
> Cheers,
> Longman
> 

-- 
Frederic Weisbecker
SUSE Labs