include/linux/sched/isolation.h

   1 #ifndef _LINUX_SCHED_ISOLATION_H
   2 #define _LINUX_SCHED_ISOLATION_H
   3
   4 #include <linux/cpumask.h>
   5 #include <linux/cpuset.h>
   6 #include <linux/init.h>
   7 #include <linux/tick.h>
   8
   9 enum hk_type {
  10         HK_TYPE_TIMER,
  11         HK_TYPE_RCU,
  12         HK_TYPE_MISC,
  13         HK_TYPE_SCHED,
  14         HK_TYPE_TICK,
  15         HK_TYPE_DOMAIN,
  16         HK_TYPE_WQ,
  17         HK_TYPE_MANAGED_IRQ,
  18         HK_TYPE_KTHREAD,
  19         HK_TYPE_MAX
  20 };
  21
  22 #ifdef CONFIG_CPU_ISOLATION
  23 DECLARE_STATIC_KEY_FALSE(housekeeping_overridden);
  24 extern int housekeeping_any_cpu(enum hk_type type);
  25 extern const struct cpumask *housekeeping_cpumask(enum hk_type type);
  26 extern bool housekeeping_enabled(enum hk_type type);
  27 extern void housekeeping_affine(struct task_struct *t, enum hk_type type);
  28 extern bool housekeeping_test_cpu(int cpu, enum hk_type type);
  29 extern void __init housekeeping_init(void);
  30
  31 #else
  32
  33 static inline int housekeeping_any_cpu(enum hk_type type)
  34 {
  35         return smp_processor_id();
  36 }
  37
  38 static inline const struct cpumask *housekeeping_cpumask(enum hk_type type)
  39 {
  40         return cpu_possible_mask;
  41 }
  42
  43 static inline bool housekeeping_enabled(enum hk_type type)
  44 {
  45         return false;
  46 }
  47
  48 static inline void housekeeping_affine(struct task_struct *t,
  49                                        enum hk_type type) { }
  50
  51 static inline bool housekeeping_test_cpu(int cpu, enum hk_type type)
  52 {
  53         return true;
  54 }
  55
  56 static inline void housekeeping_init(void) { }
  57 #endif /* CONFIG_CPU_ISOLATION */
  58
  59 static inline bool housekeeping_cpu(int cpu, enum hk_type type)
  60 {
  61 #ifdef CONFIG_CPU_ISOLATION
  62         if (static_branch_unlikely(&housekeeping_overridden))
  63                 return housekeeping_test_cpu(cpu, type);
  64 #endif
  65         return true;
  66 }
  67
  68 static inline bool cpu_is_isolated(int cpu)
  69 {
  70         return !housekeeping_test_cpu(cpu, HK_TYPE_DOMAIN) ||
  71                !housekeeping_test_cpu(cpu, HK_TYPE_TICK) ||
  72                cpuset_cpu_is_isolated(cpu);
  73 }
  74
  75 #endif /* _LINUX_SCHED_ISOLATION_H */