[PATCH v2 01/12] sched/isolation: Separate housekeeping types in enum hk_type

[Qiliang Yuan]

Most kernel noise types (TICK, TIMER, RCU, etc.) are currently aliased
to a single HK_TYPE_KERNEL_NOISE enum value. This prevents fine-grained
runtime isolation control as all masks are forced to be identical.

Un-alias service-specific housekeeping types in enum hk_type. This
separation provides the necessary granularity for DHM subsystems to
subscribe to and maintain independent affinity masks.

Signed-off-by: Qiliang Yuan <realwujing@xxxxxxxxx>
---
 include/linux/sched/isolation.h | 20 ++++++++------------
 kernel/sched/isolation.c        | 10 +++++++++-
 2 files changed, 17 insertions(+), 13 deletions(-)

diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h
index dc3975ff1b2e1..b9a041247565c 100644
--- a/include/linux/sched/isolation.h
+++ b/include/linux/sched/isolation.h
@@ -17,21 +17,17 @@ enum hk_type {
 	/* 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_TICK,
+	HK_TYPE_TIMER,
+	HK_TYPE_RCU,
+	HK_TYPE_MISC,
+	HK_TYPE_WQ,
+	HK_TYPE_KTHREAD,
 	HK_TYPE_MAX,
-
-	/*
-	 * The following housekeeping types are only set by the nohz_full
-	 * boot commandline option. So they can share the same value.
-	 */
-	HK_TYPE_TICK    = HK_TYPE_KERNEL_NOISE,
-	HK_TYPE_TIMER   = HK_TYPE_KERNEL_NOISE,
-	HK_TYPE_RCU     = HK_TYPE_KERNEL_NOISE,
-	HK_TYPE_MISC    = HK_TYPE_KERNEL_NOISE,
-	HK_TYPE_WQ      = HK_TYPE_KERNEL_NOISE,
-	HK_TYPE_KTHREAD = HK_TYPE_KERNEL_NOISE
 };
 
+#define HK_TYPE_KERNEL_NOISE HK_TYPE_TICK
+
 #ifdef CONFIG_CPU_ISOLATION
 DECLARE_STATIC_KEY_FALSE(housekeeping_overridden);
 extern int housekeeping_any_cpu(enum hk_type type);
diff --git a/kernel/sched/isolation.c b/kernel/sched/isolation.c
index ef152d401fe20..e05ed5118e651 100644
--- a/kernel/sched/isolation.c
+++ b/kernel/sched/isolation.c
@@ -15,9 +15,17 @@ 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_TICK		= BIT(HK_TYPE_TICK),
+	HK_FLAG_TIMER		= BIT(HK_TYPE_TIMER),
+	HK_FLAG_RCU		= BIT(HK_TYPE_RCU),
+	HK_FLAG_MISC		= BIT(HK_TYPE_MISC),
+	HK_FLAG_WQ		= BIT(HK_TYPE_WQ),
+	HK_FLAG_KTHREAD		= BIT(HK_TYPE_KTHREAD),
 };
 
+#define HK_FLAG_KERNEL_NOISE (HK_FLAG_TICK | HK_FLAG_TIMER | HK_FLAG_RCU | \
+			      HK_FLAG_MISC | HK_FLAG_WQ | HK_FLAG_KTHREAD)
+
 DEFINE_STATIC_KEY_FALSE(housekeeping_overridden);
 EXPORT_SYMBOL_GPL(housekeeping_overridden);
 

-- 
2.43.0