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 HK_TYPE_TIMER, 10 HK_TYPE_RCU, 11 HK_TYPE_MISC, 12 HK_TYPE_SCHED, 13 HK_TYPE_TICK, 14 HK_TYPE_DOMAIN, 15 HK_TYPE_WQ, 16 HK_TYPE_MANAGED_IRQ, 17 HK_TYPE_KTHREAD, 18 HK_TYPE_MAX 19 }; 20 21 #ifdef CONFIG_CPU_ISOLATION 22 DECLARE_STATIC_KEY_FALSE(housekeeping_overridden); 23 extern int housekeeping_any_cpu(enum hk_type type); 24 extern const struct cpumask *housekeeping_cpumask(enum hk_type type); 25 extern bool housekeeping_enabled(enum hk_type type); 26 extern void housekeeping_affine(struct task_struct *t, enum hk_type type); 27 extern bool housekeeping_test_cpu(int cpu, enum hk_type type); 28 extern void __init housekeeping_init(void); 29 30 #else 31 32 static inline int housekeeping_any_cpu(enum hk_type type) 33 { 34 return smp_processor_id(); 35 } 36 37 static inline const struct cpumask *housekeeping_cpumask(enum hk_type type) 38 { 39 return cpu_possible_mask; 40 } 41 42 static inline bool housekeeping_enabled(enum hk_type type) 43 { 44 return false; 45 } 46 47 static inline void housekeeping_affine(struct task_struct *t, 48 enum hk_type type) { } 49 50 static inline bool housekeeping_test_cpu(int cpu, enum hk_type type) 51 { 52 return true; 53 } 54 55 static inline void housekeeping_init(void) { } 56 #endif /* CONFIG_CPU_ISOLATION */ 57 58 static inline bool housekeeping_cpu(int cpu, enum hk_type type) 59 { 60 #ifdef CONFIG_CPU_ISOLATION 61 if (static_branch_unlikely(&housekeeping_overridden)) 62 return housekeeping_test_cpu(cpu, type); 63 #endif 64 return true; 65 } 66 67 static inline bool cpu_is_isolated(int cpu) 68 { 69 return !housekeeping_test_cpu(cpu, HK_TYPE_DOMAIN) || 70 !housekeeping_test_cpu(cpu, HK_TYPE_TICK); 71 } 72 73 #endif /* _LINUX_SCHED_ISOLATION_H */ 74