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/init.h>
   6 #include <linux/tick.h>
   7
   8 enum hk_flags {
   9         HK_FLAG_TIMER           = 1,
  10         HK_FLAG_RCU             = (1 << 1),
  11         HK_FLAG_MISC            = (1 << 2),
  12         HK_FLAG_SCHED           = (1 << 3),
  13         HK_FLAG_TICK            = (1 << 4),
  14         HK_FLAG_DOMAIN          = (1 << 5),
  15 };
  16
  17 #ifdef CONFIG_CPU_ISOLATION
  18 DECLARE_STATIC_KEY_FALSE(housekeeping_overriden);
  19 extern int housekeeping_any_cpu(enum hk_flags flags);
  20 extern const struct cpumask *housekeeping_cpumask(enum hk_flags flags);
  21 extern void housekeeping_affine(struct task_struct *t, enum hk_flags flags);
  22 extern bool housekeeping_test_cpu(int cpu, enum hk_flags flags);
  23 extern void __init housekeeping_init(void);
  24
  25 #else
  26
  27 static inline int housekeeping_any_cpu(enum hk_flags flags)
  28 {
  29         return smp_processor_id();
  30 }
  31
  32 static inline const struct cpumask *housekeeping_cpumask(enum hk_flags flags)
  33 {
  34         return cpu_possible_mask;
  35 }
  36
  37 static inline void housekeeping_affine(struct task_struct *t,
  38                                        enum hk_flags flags) { }
  39 static inline void housekeeping_init(void) { }
  40 #endif /* CONFIG_CPU_ISOLATION */
  41
  42 static inline bool housekeeping_cpu(int cpu, enum hk_flags flags)
  43 {
  44 #ifdef CONFIG_CPU_ISOLATION
  45         if (static_branch_unlikely(&housekeeping_overriden))
  46                 return housekeeping_test_cpu(cpu, flags);
  47 #endif
  48         return true;
  49 }
  50
  51 #endif /* _LINUX_SCHED_ISOLATION_H */