LXR linux/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
   8enum 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        HK_FLAG_WQ              = (1 << 6),
  16};
  17
  18#ifdef CONFIG_CPU_ISOLATION
  19DECLARE_STATIC_KEY_FALSE(housekeeping_overridden);
  20extern int housekeeping_any_cpu(enum hk_flags flags);
  21extern const struct cpumask *housekeeping_cpumask(enum hk_flags flags);
  22extern bool housekeeping_enabled(enum hk_flags flags);
  23extern void housekeeping_affine(struct task_struct *t, enum hk_flags flags);
  24extern bool housekeeping_test_cpu(int cpu, enum hk_flags flags);
  25extern void __init housekeeping_init(void);
  26
  27#else
  28
  29static inline int housekeeping_any_cpu(enum hk_flags flags)
  30{
  31        return smp_processor_id();
  32}
  33
  34static inline const struct cpumask *housekeeping_cpumask(enum hk_flags flags)
  35{
  36        return cpu_possible_mask;
  37}
  38
  39static inline bool housekeeping_enabled(enum hk_flags flags)
  40{
  41        return false;
  42}
  43
  44static inline void housekeeping_affine(struct task_struct *t,
  45                                       enum hk_flags flags) { }
  46static inline void housekeeping_init(void) { }
  47#endif /* CONFIG_CPU_ISOLATION */
  48
  49static inline bool housekeeping_cpu(int cpu, enum hk_flags flags)
  50{
  51#ifdef CONFIG_CPU_ISOLATION
  52        if (static_branch_unlikely(&housekeeping_overridden))
  53                return housekeeping_test_cpu(cpu, flags);
  54#endif
  55        return true;
  56}
  57
  58#endif /* _LINUX_SCHED_ISOLATION_H */
  59