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