1#ifndef _LINUX_CPUSET_H
2#define _LINUX_CPUSET_H
3
4
5
6
7
8
9
10
11#include <linux/sched.h>
12#include <linux/cpumask.h>
13#include <linux/nodemask.h>
14#include <linux/mm.h>
15#include <linux/jump_label.h>
16
17#ifdef CONFIG_CPUSETS
18
19extern struct static_key cpusets_enabled_key;
20static inline bool cpusets_enabled(void)
21{
22 return static_key_false(&cpusets_enabled_key);
23}
24
25static inline int nr_cpusets(void)
26{
27
28 return static_key_count(&cpusets_enabled_key) + 1;
29}
30
31static inline void cpuset_inc(void)
32{
33 static_key_slow_inc(&cpusets_enabled_key);
34}
35
36static inline void cpuset_dec(void)
37{
38 static_key_slow_dec(&cpusets_enabled_key);
39}
40
41extern int cpuset_init(void);
42extern void cpuset_init_smp(void);
43extern void cpuset_update_active_cpus(bool cpu_online);
44extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask);
45extern void cpuset_cpus_allowed_fallback(struct task_struct *p);
46extern nodemask_t cpuset_mems_allowed(struct task_struct *p);
47#define cpuset_current_mems_allowed (current->mems_allowed)
48void cpuset_init_current_mems_allowed(void);
49int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask);
50
51extern int __cpuset_node_allowed(int node, gfp_t gfp_mask);
52
53static inline int cpuset_node_allowed(int node, gfp_t gfp_mask)
54{
55 return nr_cpusets() <= 1 || __cpuset_node_allowed(node, gfp_mask);
56}
57
58static inline int cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask)
59{
60 return cpuset_node_allowed(zone_to_nid(z), gfp_mask);
61}
62
63extern int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
64 const struct task_struct *tsk2);
65
66#define cpuset_memory_pressure_bump() \
67 do { \
68 if (cpuset_memory_pressure_enabled) \
69 __cpuset_memory_pressure_bump(); \
70 } while (0)
71extern int cpuset_memory_pressure_enabled;
72extern void __cpuset_memory_pressure_bump(void);
73
74extern void cpuset_task_status_allowed(struct seq_file *m,
75 struct task_struct *task);
76extern int proc_cpuset_show(struct seq_file *m, struct pid_namespace *ns,
77 struct pid *pid, struct task_struct *tsk);
78
79extern int cpuset_mem_spread_node(void);
80extern int cpuset_slab_spread_node(void);
81
82static inline int cpuset_do_page_mem_spread(void)
83{
84 return task_spread_page(current);
85}
86
87static inline int cpuset_do_slab_mem_spread(void)
88{
89 return task_spread_slab(current);
90}
91
92extern int current_cpuset_is_being_rebound(void);
93
94extern void rebuild_sched_domains(void);
95
96extern void cpuset_print_current_mems_allowed(void);
97
98
99
100
101
102
103
104
105static inline unsigned int read_mems_allowed_begin(void)
106{
107 if (!cpusets_enabled())
108 return 0;
109
110 return read_seqcount_begin(¤t->mems_allowed_seq);
111}
112
113
114
115
116
117
118
119static inline bool read_mems_allowed_retry(unsigned int seq)
120{
121 if (!cpusets_enabled())
122 return false;
123
124 return read_seqcount_retry(¤t->mems_allowed_seq, seq);
125}
126
127static inline void set_mems_allowed(nodemask_t nodemask)
128{
129 unsigned long flags;
130
131 task_lock(current);
132 local_irq_save(flags);
133 write_seqcount_begin(¤t->mems_allowed_seq);
134 current->mems_allowed = nodemask;
135 write_seqcount_end(¤t->mems_allowed_seq);
136 local_irq_restore(flags);
137 task_unlock(current);
138}
139
140#else
141
142static inline bool cpusets_enabled(void) { return false; }
143
144static inline int cpuset_init(void) { return 0; }
145static inline void cpuset_init_smp(void) {}
146
147static inline void cpuset_update_active_cpus(bool cpu_online)
148{
149 partition_sched_domains(1, NULL, NULL);
150}
151
152static inline void cpuset_cpus_allowed(struct task_struct *p,
153 struct cpumask *mask)
154{
155 cpumask_copy(mask, cpu_possible_mask);
156}
157
158static inline void cpuset_cpus_allowed_fallback(struct task_struct *p)
159{
160}
161
162static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)
163{
164 return node_possible_map;
165}
166
167#define cpuset_current_mems_allowed (node_states[N_MEMORY])
168static inline void cpuset_init_current_mems_allowed(void) {}
169
170static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask)
171{
172 return 1;
173}
174
175static inline int cpuset_node_allowed(int node, gfp_t gfp_mask)
176{
177 return 1;
178}
179
180static inline int cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask)
181{
182 return 1;
183}
184
185static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
186 const struct task_struct *tsk2)
187{
188 return 1;
189}
190
191static inline void cpuset_memory_pressure_bump(void) {}
192
193static inline void cpuset_task_status_allowed(struct seq_file *m,
194 struct task_struct *task)
195{
196}
197
198static inline int cpuset_mem_spread_node(void)
199{
200 return 0;
201}
202
203static inline int cpuset_slab_spread_node(void)
204{
205 return 0;
206}
207
208static inline int cpuset_do_page_mem_spread(void)
209{
210 return 0;
211}
212
213static inline int cpuset_do_slab_mem_spread(void)
214{
215 return 0;
216}
217
218static inline int current_cpuset_is_being_rebound(void)
219{
220 return 0;
221}
222
223static inline void rebuild_sched_domains(void)
224{
225 partition_sched_domains(1, NULL, NULL);
226}
227
228static inline void cpuset_print_current_mems_allowed(void)
229{
230}
231
232static inline void set_mems_allowed(nodemask_t nodemask)
233{
234}
235
236static inline unsigned int read_mems_allowed_begin(void)
237{
238 return 0;
239}
240
241static inline bool read_mems_allowed_retry(unsigned int seq)
242{
243 return false;
244}
245
246#endif
247
248#endif
249