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
9enum hk_type {
10 HK_TYPE_DOMAIN,
11 HK_TYPE_MANAGED_IRQ,
12 HK_TYPE_KERNEL_NOISE,
13 HK_TYPE_MAX,
14
15 /*
16 * The following housekeeping types are only set by the nohz_full
17 * boot commandline option. So they can share the same value.
18 */
19 HK_TYPE_TICK = HK_TYPE_KERNEL_NOISE,
20 HK_TYPE_TIMER = HK_TYPE_KERNEL_NOISE,
21 HK_TYPE_RCU = HK_TYPE_KERNEL_NOISE,
22 HK_TYPE_MISC = HK_TYPE_KERNEL_NOISE,
23 HK_TYPE_WQ = HK_TYPE_KERNEL_NOISE,
24 HK_TYPE_KTHREAD = HK_TYPE_KERNEL_NOISE
25};
26
27#ifdef CONFIG_CPU_ISOLATION
28DECLARE_STATIC_KEY_FALSE(housekeeping_overridden);
29extern int housekeeping_any_cpu(enum hk_type type);
30extern const struct cpumask *housekeeping_cpumask(enum hk_type type);
31extern bool housekeeping_enabled(enum hk_type type);
32extern void housekeeping_affine(struct task_struct *t, enum hk_type type);
33extern bool housekeeping_test_cpu(int cpu, enum hk_type type);
34extern void __init housekeeping_init(void);
35
36#else
37
38static inline int housekeeping_any_cpu(enum hk_type type)
39{
40 return smp_processor_id();
41}
42
43static inline const struct cpumask *housekeeping_cpumask(enum hk_type type)
44{
45 return cpu_possible_mask;
46}
47
48static inline bool housekeeping_enabled(enum hk_type type)
49{
50 return false;
51}
52
53static inline void housekeeping_affine(struct task_struct *t,
54 enum hk_type type) { }
55
56static inline bool housekeeping_test_cpu(int cpu, enum hk_type type)
57{
58 return true;
59}
60
61static inline void housekeeping_init(void) { }
62#endif /* CONFIG_CPU_ISOLATION */
63
64static inline bool housekeeping_cpu(int cpu, enum hk_type type)
65{
66#ifdef CONFIG_CPU_ISOLATION
67 if (static_branch_unlikely(&housekeeping_overridden))
68 return housekeeping_test_cpu(cpu, type);
69#endif
70 return true;
71}
72
73static inline bool cpu_is_isolated(int cpu)
74{
75 return !housekeeping_test_cpu(cpu, type: HK_TYPE_DOMAIN) ||
76 !housekeeping_test_cpu(cpu, type: HK_TYPE_TICK) ||
77 cpuset_cpu_is_isolated(cpu);
78}
79
80#endif /* _LINUX_SCHED_ISOLATION_H */
81