Linux kernel mirror (for testing)
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1#ifndef _LINUX_CPUSET_H
2#define _LINUX_CPUSET_H
3/*
4 * cpuset interface
5 *
6 * Copyright (C) 2003 BULL SA
7 * Copyright (C) 2004-2006 Silicon Graphics, Inc.
8 *
9 */
10
11#include <linux/sched.h>
12#include <linux/sched/topology.h>
13#include <linux/sched/task.h>
14#include <linux/cpumask.h>
15#include <linux/nodemask.h>
16#include <linux/mm.h>
17#include <linux/jump_label.h>
18
19#ifdef CONFIG_CPUSETS
20
21extern struct static_key_false cpusets_enabled_key;
22static inline bool cpusets_enabled(void)
23{
24 return static_branch_unlikely(&cpusets_enabled_key);
25}
26
27static inline int nr_cpusets(void)
28{
29 /* jump label reference count + the top-level cpuset */
30 return static_key_count(&cpusets_enabled_key.key) + 1;
31}
32
33static inline void cpuset_inc(void)
34{
35 static_branch_inc(&cpusets_enabled_key);
36}
37
38static inline void cpuset_dec(void)
39{
40 static_branch_dec(&cpusets_enabled_key);
41}
42
43extern int cpuset_init(void);
44extern void cpuset_init_smp(void);
45extern void cpuset_update_active_cpus(void);
46extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask);
47extern void cpuset_cpus_allowed_fallback(struct task_struct *p);
48extern nodemask_t cpuset_mems_allowed(struct task_struct *p);
49#define cpuset_current_mems_allowed (current->mems_allowed)
50void cpuset_init_current_mems_allowed(void);
51int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask);
52
53extern bool __cpuset_node_allowed(int node, gfp_t gfp_mask);
54
55static inline bool cpuset_node_allowed(int node, gfp_t gfp_mask)
56{
57 if (cpusets_enabled())
58 return __cpuset_node_allowed(node, gfp_mask);
59 return true;
60}
61
62static inline bool __cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask)
63{
64 return __cpuset_node_allowed(zone_to_nid(z), gfp_mask);
65}
66
67static inline bool cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask)
68{
69 if (cpusets_enabled())
70 return __cpuset_zone_allowed(z, gfp_mask);
71 return true;
72}
73
74extern int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
75 const struct task_struct *tsk2);
76
77#define cpuset_memory_pressure_bump() \
78 do { \
79 if (cpuset_memory_pressure_enabled) \
80 __cpuset_memory_pressure_bump(); \
81 } while (0)
82extern int cpuset_memory_pressure_enabled;
83extern void __cpuset_memory_pressure_bump(void);
84
85extern void cpuset_task_status_allowed(struct seq_file *m,
86 struct task_struct *task);
87extern int proc_cpuset_show(struct seq_file *m, struct pid_namespace *ns,
88 struct pid *pid, struct task_struct *tsk);
89
90extern int cpuset_mem_spread_node(void);
91extern int cpuset_slab_spread_node(void);
92
93static inline int cpuset_do_page_mem_spread(void)
94{
95 return task_spread_page(current);
96}
97
98static inline int cpuset_do_slab_mem_spread(void)
99{
100 return task_spread_slab(current);
101}
102
103extern int current_cpuset_is_being_rebound(void);
104
105extern void rebuild_sched_domains(void);
106
107extern void cpuset_print_current_mems_allowed(void);
108
109/*
110 * read_mems_allowed_begin is required when making decisions involving
111 * mems_allowed such as during page allocation. mems_allowed can be updated in
112 * parallel and depending on the new value an operation can fail potentially
113 * causing process failure. A retry loop with read_mems_allowed_begin and
114 * read_mems_allowed_retry prevents these artificial failures.
115 */
116static inline unsigned int read_mems_allowed_begin(void)
117{
118 if (!cpusets_enabled())
119 return 0;
120
121 return read_seqcount_begin(¤t->mems_allowed_seq);
122}
123
124/*
125 * If this returns true, the operation that took place after
126 * read_mems_allowed_begin may have failed artificially due to a concurrent
127 * update of mems_allowed. It is up to the caller to retry the operation if
128 * appropriate.
129 */
130static inline bool read_mems_allowed_retry(unsigned int seq)
131{
132 if (!cpusets_enabled())
133 return false;
134
135 return read_seqcount_retry(¤t->mems_allowed_seq, seq);
136}
137
138static inline void set_mems_allowed(nodemask_t nodemask)
139{
140 unsigned long flags;
141
142 task_lock(current);
143 local_irq_save(flags);
144 write_seqcount_begin(¤t->mems_allowed_seq);
145 current->mems_allowed = nodemask;
146 write_seqcount_end(¤t->mems_allowed_seq);
147 local_irq_restore(flags);
148 task_unlock(current);
149}
150
151#else /* !CONFIG_CPUSETS */
152
153static inline bool cpusets_enabled(void) { return false; }
154
155static inline int cpuset_init(void) { return 0; }
156static inline void cpuset_init_smp(void) {}
157
158static inline void cpuset_update_active_cpus(void)
159{
160 partition_sched_domains(1, NULL, NULL);
161}
162
163static inline void cpuset_cpus_allowed(struct task_struct *p,
164 struct cpumask *mask)
165{
166 cpumask_copy(mask, cpu_possible_mask);
167}
168
169static inline void cpuset_cpus_allowed_fallback(struct task_struct *p)
170{
171}
172
173static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)
174{
175 return node_possible_map;
176}
177
178#define cpuset_current_mems_allowed (node_states[N_MEMORY])
179static inline void cpuset_init_current_mems_allowed(void) {}
180
181static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask)
182{
183 return 1;
184}
185
186static inline bool cpuset_node_allowed(int node, gfp_t gfp_mask)
187{
188 return true;
189}
190
191static inline bool __cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask)
192{
193 return true;
194}
195
196static inline bool cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask)
197{
198 return true;
199}
200
201static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
202 const struct task_struct *tsk2)
203{
204 return 1;
205}
206
207static inline void cpuset_memory_pressure_bump(void) {}
208
209static inline void cpuset_task_status_allowed(struct seq_file *m,
210 struct task_struct *task)
211{
212}
213
214static inline int cpuset_mem_spread_node(void)
215{
216 return 0;
217}
218
219static inline int cpuset_slab_spread_node(void)
220{
221 return 0;
222}
223
224static inline int cpuset_do_page_mem_spread(void)
225{
226 return 0;
227}
228
229static inline int cpuset_do_slab_mem_spread(void)
230{
231 return 0;
232}
233
234static inline int current_cpuset_is_being_rebound(void)
235{
236 return 0;
237}
238
239static inline void rebuild_sched_domains(void)
240{
241 partition_sched_domains(1, NULL, NULL);
242}
243
244static inline void cpuset_print_current_mems_allowed(void)
245{
246}
247
248static inline void set_mems_allowed(nodemask_t nodemask)
249{
250}
251
252static inline unsigned int read_mems_allowed_begin(void)
253{
254 return 0;
255}
256
257static inline bool read_mems_allowed_retry(unsigned int seq)
258{
259 return false;
260}
261
262#endif /* !CONFIG_CPUSETS */
263
264#endif /* _LINUX_CPUSET_H */