[PATCH 01/23] sched/isolation: Add HK_TYPE_KERNEL_NOISE_BOOT & HK_TYPE_MANAGED_IRQ_BOOT

[Waiman Long]

Since commit 4fca0e550d50 ("sched/isolation: Save boot defined
domain flags"), HK_TYPE_DOMAIN_BOOT was added to record the boot
time "isolcpus{=domain}" setting. As we are going to make the
HK_TYPE_MANAGED_IRQ and HK_TYPE_KERNEL_NOISE housekeeping cpumasks
runtime modifiable, we need some additional cpumasks to record the boot
time settings to make sure that those housekeeping cpumasks will always
be a subset of their boot time equivalents.

Introduce the new HK_TYPE_KERNEL_NOISE_BOOT and HK_TYPE_MANAGED_IRQ_BOOT
housekeeping types to do that.

Signed-off-by: Waiman Long <longman@xxxxxxxxxx>
---
 include/linux/sched/isolation.h | 16 ++++++++++++++--
 kernel/sched/isolation.c        | 16 +++++++++-------
 2 files changed, 23 insertions(+), 9 deletions(-)

diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h
index dc3975ff1b2e..d1707f121e20 100644
--- a/include/linux/sched/isolation.h
+++ b/include/linux/sched/isolation.h
@@ -14,10 +14,22 @@ enum hk_type {
 	 * is always a subset of 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_BOOT,
+	/*
+	 * A subset of HK_TYPE_KERNEL_NOISE_BOOT as it may excludes some
+	 * additional isolated CPUs at run time.
+	 */
 	HK_TYPE_KERNEL_NOISE,
+
+	/* Inverse of boot-time isolcpus=managed_irq argument */
+	HK_TYPE_MANAGED_IRQ_BOOT,
+	/*
+	 * A subset of HK_TYPE_MANAGED_IRQ_BOOT as it may excludes some
+	 * additional isolated CPUs at run time.
+	 */
+	HK_TYPE_MANAGED_IRQ,
 	HK_TYPE_MAX,
 
 	/*
diff --git a/kernel/sched/isolation.c b/kernel/sched/isolation.c
index a947d75b43f1..9ec9ae510dc7 100644
--- a/kernel/sched/isolation.c
+++ b/kernel/sched/isolation.c
@@ -12,10 +12,12 @@
 #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),
+	HK_FLAG_DOMAIN_BOOT	  = BIT(HK_TYPE_DOMAIN_BOOT),
+	HK_FLAG_DOMAIN		  = BIT(HK_TYPE_DOMAIN),
+	HK_FLAG_KERNEL_NOISE_BOOT = BIT(HK_TYPE_KERNEL_NOISE_BOOT),
+	HK_FLAG_KERNEL_NOISE	  = BIT(HK_TYPE_KERNEL_NOISE),
+	HK_FLAG_MANAGED_IRQ_BOOT  = BIT(HK_TYPE_MANAGED_IRQ_BOOT),
+	HK_FLAG_MANAGED_IRQ	  = BIT(HK_TYPE_MANAGED_IRQ),
 };
 
 DEFINE_STATIC_KEY_FALSE(housekeeping_overridden);
@@ -315,7 +317,7 @@ static int __init housekeeping_nohz_full_setup(char *str)
 {
 	unsigned long flags;
 
-	flags = HK_FLAG_KERNEL_NOISE;
+	flags = HK_FLAG_KERNEL_NOISE | HK_FLAG_KERNEL_NOISE_BOOT;
 
 	return housekeeping_setup(str, flags);
 }
@@ -334,7 +336,7 @@ static int __init housekeeping_isolcpus_setup(char *str)
 		 */
 		if (!strncmp(str, "nohz,", 5)) {
 			str += 5;
-			flags |= HK_FLAG_KERNEL_NOISE;
+			flags |= HK_FLAG_KERNEL_NOISE | HK_FLAG_KERNEL_NOISE_BOOT;
 			continue;
 		}
 
@@ -346,7 +348,7 @@ static int __init housekeeping_isolcpus_setup(char *str)
 
 		if (!strncmp(str, "managed_irq,", 12)) {
 			str += 12;
-			flags |= HK_FLAG_MANAGED_IRQ;
+			flags |= HK_FLAG_MANAGED_IRQ | HK_FLAG_MANAGED_IRQ_BOOT;
 			continue;
 		}
 
-- 
2.53.0