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sched/isolation: Save boot defined domain flags

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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@kernel.org>
Reviewed-by: Phil Auld <pauld@redhat.com>
Reviewed-by: Waiman Long <longman@redhat.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Marco Crivellari <marco.crivellari@suse.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Waiman Long <longman@redhat.com>
This commit is contained in:
Frederic Weisbecker 2025-05-26 13:06:21 +02:00
parent 69e227e450
commit 4fca0e550d
2 changed files with 7 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

4
include/linux/sched/isolation.h
View file

@ -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,

5
kernel/sched/isolation.c
View file

@ -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);
}