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cpuset,mm: fix no node to alloc memory when changing cpuset's mems
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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/cpumask.h>
13 #include <linux/nodemask.h>
14 #include <linux/cgroup.h>
15 #include <linux/mm.h>
16
17 #ifdef CONFIG_CPUSETS
18
19 extern int number_of_cpusets; /* How many cpusets are defined in system? */
20
21 extern int cpuset_init(void);
22 extern void cpuset_init_smp(void);
23 extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask);
24 extern int cpuset_cpus_allowed_fallback(struct task_struct *p);
25 extern nodemask_t cpuset_mems_allowed(struct task_struct *p);
26 #define cpuset_current_mems_allowed (current->mems_allowed)
27 void cpuset_init_current_mems_allowed(void);
28 int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask);
29
30 extern int __cpuset_node_allowed_softwall(int node, gfp_t gfp_mask);
31 extern int __cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask);
32
33 static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask)
34 {
35 return number_of_cpusets <= 1 ||
36 __cpuset_node_allowed_softwall(node, gfp_mask);
37 }
38
39 static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask)
40 {
41 return number_of_cpusets <= 1 ||
42 __cpuset_node_allowed_hardwall(node, gfp_mask);
43 }
44
45 static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
46 {
47 return cpuset_node_allowed_softwall(zone_to_nid(z), gfp_mask);
48 }
49
50 static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask)
51 {
52 return cpuset_node_allowed_hardwall(zone_to_nid(z), gfp_mask);
53 }
54
55 extern int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
56 const struct task_struct *tsk2);
57
58 #define cpuset_memory_pressure_bump() \
59 do { \
60 if (cpuset_memory_pressure_enabled) \
61 __cpuset_memory_pressure_bump(); \
62 } while (0)
63 extern int cpuset_memory_pressure_enabled;
64 extern void __cpuset_memory_pressure_bump(void);
65
66 extern const struct file_operations proc_cpuset_operations;
67 struct seq_file;
68 extern void cpuset_task_status_allowed(struct seq_file *m,
69 struct task_struct *task);
70
71 extern int cpuset_mem_spread_node(void);
72
73 static inline int cpuset_do_page_mem_spread(void)
74 {
75 return current->flags & PF_SPREAD_PAGE;
76 }
77
78 static inline int cpuset_do_slab_mem_spread(void)
79 {
80 return current->flags & PF_SPREAD_SLAB;
81 }
82
83 extern int current_cpuset_is_being_rebound(void);
84
85 extern void rebuild_sched_domains(void);
86
87 extern void cpuset_print_task_mems_allowed(struct task_struct *p);
88
89 /*
90 * reading current mems_allowed and mempolicy in the fastpath must protected
91 * by get_mems_allowed()
92 */
93 static inline void get_mems_allowed(void)
94 {
95 current->mems_allowed_change_disable++;
96
97 /*
98 * ensure that reading mems_allowed and mempolicy happens after the
99 * update of ->mems_allowed_change_disable.
100 *
101 * the write-side task finds ->mems_allowed_change_disable is not 0,
102 * and knows the read-side task is reading mems_allowed or mempolicy,
103 * so it will clear old bits lazily.
104 */
105 smp_mb();
106 }
107
108 static inline void put_mems_allowed(void)
109 {
110 /*
111 * ensure that reading mems_allowed and mempolicy before reducing
112 * mems_allowed_change_disable.
113 *
114 * the write-side task will know that the read-side task is still
115 * reading mems_allowed or mempolicy, don't clears old bits in the
116 * nodemask.
117 */
118 smp_mb();
119 --ACCESS_ONCE(current->mems_allowed_change_disable);
120 }
121
122 static inline void set_mems_allowed(nodemask_t nodemask)
123 {
124 task_lock(current);
125 current->mems_allowed = nodemask;
126 task_unlock(current);
127 }
128
129 #else /* !CONFIG_CPUSETS */
130
131 static inline int cpuset_init(void) { return 0; }
132 static inline void cpuset_init_smp(void) {}
133
134 static inline void cpuset_cpus_allowed(struct task_struct *p,
135 struct cpumask *mask)
136 {
137 cpumask_copy(mask, cpu_possible_mask);
138 }
139
140 static inline int cpuset_cpus_allowed_fallback(struct task_struct *p)
141 {
142 cpumask_copy(&p->cpus_allowed, cpu_possible_mask);
143 return cpumask_any(cpu_active_mask);
144 }
145
146 static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)
147 {
148 return node_possible_map;
149 }
150
151 #define cpuset_current_mems_allowed (node_states[N_HIGH_MEMORY])
152 static inline void cpuset_init_current_mems_allowed(void) {}
153
154 static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask)
155 {
156 return 1;
157 }
158
159 static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask)
160 {
161 return 1;
162 }
163
164 static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask)
165 {
166 return 1;
167 }
168
169 static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
170 {
171 return 1;
172 }
173
174 static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask)
175 {
176 return 1;
177 }
178
179 static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
180 const struct task_struct *tsk2)
181 {
182 return 1;
183 }
184
185 static inline void cpuset_memory_pressure_bump(void) {}
186
187 static inline void cpuset_task_status_allowed(struct seq_file *m,
188 struct task_struct *task)
189 {
190 }
191
192 static inline int cpuset_mem_spread_node(void)
193 {
194 return 0;
195 }
196
197 static inline int cpuset_do_page_mem_spread(void)
198 {
199 return 0;
200 }
201
202 static inline int cpuset_do_slab_mem_spread(void)
203 {
204 return 0;
205 }
206
207 static inline int current_cpuset_is_being_rebound(void)
208 {
209 return 0;
210 }
211
212 static inline void rebuild_sched_domains(void)
213 {
214 partition_sched_domains(1, NULL, NULL);
215 }
216
217 static inline void cpuset_print_task_mems_allowed(struct task_struct *p)
218 {
219 }
220
221 static inline void set_mems_allowed(nodemask_t nodemask)
222 {
223 }
224
225 static inline void get_mems_allowed(void)
226 {
227 }
228
229 static inline void put_mems_allowed(void)
230 {
231 }
232
233 #endif /* !CONFIG_CPUSETS */
234
235 #endif /* _LINUX_CPUSET_H */