1 #ifndef _LINUX_SCHED_ISOLATION_H 2 #define _LINUX_SCHED_ISOLATION_H 3 4 #include <linux/cpumask.h> 5 #include <linux/init.h> 6 #include <linux/tick.h> 7 8 enum hk_type { 9 /* Inverse of boot-time isolcpus= argument */ 10 HK_TYPE_DOMAIN_BOOT, 11 /* 12 * Same as HK_TYPE_DOMAIN_BOOT but also includes the 13 * inverse of cpuset isolated partitions. As such it 14 * is always a subset of HK_TYPE_DOMAIN_BOOT. 15 */ 16 HK_TYPE_DOMAIN, 17 /* Inverse of boot-time isolcpus=managed_irq argument */ 18 HK_TYPE_MANAGED_IRQ, 19 /* Inverse of boot-time nohz_full= or isolcpus=nohz arguments */ 20 HK_TYPE_KERNEL_NOISE, 21 HK_TYPE_MAX, 22 23 /* 24 * The following housekeeping types are only set by the nohz_full 25 * boot commandline option. So they can share the same value. 26 */ 27 HK_TYPE_TICK = HK_TYPE_KERNEL_NOISE, 28 HK_TYPE_TIMER = HK_TYPE_KERNEL_NOISE, 29 HK_TYPE_RCU = HK_TYPE_KERNEL_NOISE, 30 HK_TYPE_MISC = HK_TYPE_KERNEL_NOISE, 31 HK_TYPE_WQ = HK_TYPE_KERNEL_NOISE, 32 HK_TYPE_KTHREAD = HK_TYPE_KERNEL_NOISE 33 }; 34 35 #ifdef CONFIG_CPU_ISOLATION 36 DECLARE_STATIC_KEY_FALSE(housekeeping_overridden); 37 extern int housekeeping_any_cpu(enum hk_type type); 38 extern const struct cpumask *housekeeping_cpumask(enum hk_type type); 39 extern bool housekeeping_enabled(enum hk_type type); 40 extern void housekeeping_affine(struct task_struct *t, enum hk_type type); 41 extern bool housekeeping_test_cpu(int cpu, enum hk_type type); 42 extern int housekeeping_update(struct cpumask *isol_mask); 43 extern void __init housekeeping_init(void); 44 45 #else 46 47 static inline int housekeeping_any_cpu(enum hk_type type) 48 { 49 return smp_processor_id(); 50 } 51 52 static inline const struct cpumask *housekeeping_cpumask(enum hk_type type) 53 { 54 return cpu_possible_mask; 55 } 56 57 static inline bool housekeeping_enabled(enum hk_type type) 58 { 59 return false; 60 } 61 62 static inline void housekeeping_affine(struct task_struct *t, 63 enum hk_type type) { } 64 65 static inline bool housekeeping_test_cpu(int cpu, enum hk_type type) 66 { 67 return true; 68 } 69 70 static inline int housekeeping_update(struct cpumask *isol_mask) { return 0; } 71 static inline void housekeeping_init(void) { } 72 #endif /* CONFIG_CPU_ISOLATION */ 73 74 static inline bool housekeeping_cpu(int cpu, enum hk_type type) 75 { 76 #ifdef CONFIG_CPU_ISOLATION 77 if (static_branch_unlikely(&housekeeping_overridden)) 78 return housekeeping_test_cpu(cpu, type); 79 #endif 80 return true; 81 } 82 83 static inline bool cpu_is_isolated(int cpu) 84 { 85 return !housekeeping_test_cpu(cpu, HK_TYPE_DOMAIN); 86 } 87 88 #endif /* _LINUX_SCHED_ISOLATION_H */ 89