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