Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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_type {
9 /* Inverse of boot-time isolcpus= argument */
10 HK_TYPE_DOMAIN_BOOT,
11 /*
12 * Same as HK_TYPE_DOMAIN_BOOT but also includes the
13 * inverse of cpuset isolated partitions. As such it
14 * is always a subset of HK_TYPE_DOMAIN_BOOT.
15 */
16 HK_TYPE_DOMAIN,
17 /* Inverse of boot-time isolcpus=managed_irq argument */
18 HK_TYPE_MANAGED_IRQ,
19 /* Inverse of boot-time nohz_full= or isolcpus=nohz arguments */
20 HK_TYPE_KERNEL_NOISE,
21 HK_TYPE_MAX,
22
23 /*
24 * The following housekeeping types are only set by the nohz_full
25 * boot commandline option. So they can share the same value.
26 */
27 HK_TYPE_TICK = HK_TYPE_KERNEL_NOISE,
28 HK_TYPE_TIMER = HK_TYPE_KERNEL_NOISE,
29 HK_TYPE_RCU = HK_TYPE_KERNEL_NOISE,
30 HK_TYPE_MISC = HK_TYPE_KERNEL_NOISE,
31 HK_TYPE_WQ = HK_TYPE_KERNEL_NOISE,
32 HK_TYPE_KTHREAD = HK_TYPE_KERNEL_NOISE
33};
34
35#ifdef CONFIG_CPU_ISOLATION
36DECLARE_STATIC_KEY_FALSE(housekeeping_overridden);
37extern int housekeeping_any_cpu(enum hk_type type);
38extern const struct cpumask *housekeeping_cpumask(enum hk_type type);
39extern bool housekeeping_enabled(enum hk_type type);
40extern void housekeeping_affine(struct task_struct *t, enum hk_type type);
41extern bool housekeeping_test_cpu(int cpu, enum hk_type type);
42extern int housekeeping_update(struct cpumask *isol_mask);
43extern void __init housekeeping_init(void);
44
45#else
46
47static inline int housekeeping_any_cpu(enum hk_type type)
48{
49 return smp_processor_id();
50}
51
52static inline const struct cpumask *housekeeping_cpumask(enum hk_type type)
53{
54 return cpu_possible_mask;
55}
56
57static inline bool housekeeping_enabled(enum hk_type type)
58{
59 return false;
60}
61
62static inline void housekeeping_affine(struct task_struct *t,
63 enum hk_type type) { }
64
65static inline bool housekeeping_test_cpu(int cpu, enum hk_type type)
66{
67 return true;
68}
69
70static inline int housekeeping_update(struct cpumask *isol_mask) { return 0; }
71static inline void housekeeping_init(void) { }
72#endif /* CONFIG_CPU_ISOLATION */
73
74static inline bool housekeeping_cpu(int cpu, enum hk_type type)
75{
76#ifdef CONFIG_CPU_ISOLATION
77 if (static_branch_unlikely(&housekeeping_overridden))
78 return housekeeping_test_cpu(cpu, type);
79#endif
80 return true;
81}
82
83static inline bool cpu_is_isolated(int cpu)
84{
85 return !housekeeping_test_cpu(cpu, HK_TYPE_DOMAIN);
86}
87
88#endif /* _LINUX_SCHED_ISOLATION_H */