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        HK_FLAG_MANAGED_IRQ     = (1 << 7),
  17        HK_FLAG_KTHREAD         = (1 << 8),
  18};
  19
  20#ifdef CONFIG_CPU_ISOLATION
  21DECLARE_STATIC_KEY_FALSE(housekeeping_overridden);
  22extern int housekeeping_any_cpu(enum hk_flags flags);
  23extern const struct cpumask *housekeeping_cpumask(enum hk_flags flags);
  24extern bool housekeeping_enabled(enum hk_flags flags);
  25extern void housekeeping_affine(struct task_struct *t, enum hk_flags flags);
  26extern bool housekeeping_test_cpu(int cpu, enum hk_flags flags);
  27extern void __init housekeeping_init(void);
  28
  29#else
  30
  31static inline int housekeeping_any_cpu(enum hk_flags flags)
  32{
  33        return smp_processor_id();
  34}
  35
  36static inline const struct cpumask *housekeeping_cpumask(enum hk_flags flags)
  37{
  38        return cpu_possible_mask;
  39}
  40
  41static inline bool housekeeping_enabled(enum hk_flags flags)
  42{
  43        return false;
  44}
  45
  46static inline void housekeeping_affine(struct task_struct *t,
  47                                       enum hk_flags flags) { }
  48static inline void housekeeping_init(void) { }
  49#endif /* CONFIG_CPU_ISOLATION */
  50
  51static inline bool housekeeping_cpu(int cpu, enum hk_flags flags)
  52{
  53#ifdef CONFIG_CPU_ISOLATION
  54        if (static_branch_unlikely(&housekeeping_overridden))
  55                return housekeeping_test_cpu(cpu, flags);
  56#endif
  57        return true;
  58}
  59
  60#endif /* _LINUX_SCHED_ISOLATION_H */
  61