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/cpumask.h>
13#include <linux/nodemask.h>
14#include <linux/mm.h>
15
16#ifdef CONFIG_CPUSETS
17
18extern int number_of_cpusets; /* How many cpusets are defined in system? */
19
20extern int cpuset_init(void);
21extern void cpuset_init_smp(void);
22extern void cpuset_update_active_cpus(bool cpu_online);
23extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask);
24extern void cpuset_cpus_allowed_fallback(struct task_struct *p);
25extern nodemask_t cpuset_mems_allowed(struct task_struct *p);
26#define cpuset_current_mems_allowed (current->mems_allowed)
27void cpuset_init_current_mems_allowed(void);
28int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask);
29
30extern int __cpuset_node_allowed_softwall(int node, gfp_t gfp_mask);
31extern int __cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask);
32
33static 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
39static 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
45static 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
50static 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
55extern 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)
63extern int cpuset_memory_pressure_enabled;
64extern void __cpuset_memory_pressure_bump(void);
65
66extern void cpuset_task_status_allowed(struct seq_file *m,
67 struct task_struct *task);
68extern int proc_cpuset_show(struct seq_file *, void *);
69
70extern int cpuset_mem_spread_node(void);
71extern int cpuset_slab_spread_node(void);
72
73static inline int cpuset_do_page_mem_spread(void)
74{
75 return current->flags & PF_SPREAD_PAGE;
76}
77
78static inline int cpuset_do_slab_mem_spread(void)
79{
80 return current->flags & PF_SPREAD_SLAB;
81}
82
83extern int current_cpuset_is_being_rebound(void);
84
85extern void rebuild_sched_domains(void);
86
87extern void cpuset_print_task_mems_allowed(struct task_struct *p);
88
89/*
90 * read_mems_allowed_begin is required when making decisions involving
91 * mems_allowed such as during page allocation. mems_allowed can be updated in
92 * parallel and depending on the new value an operation can fail potentially
93 * causing process failure. A retry loop with read_mems_allowed_begin and
94 * read_mems_allowed_retry prevents these artificial failures.
95 */
96static inline unsigned int read_mems_allowed_begin(void)
97{
98 return read_seqcount_begin(¤t->mems_allowed_seq);
99}
100
101/*
102 * If this returns true, the operation that took place after
103 * read_mems_allowed_begin may have failed artificially due to a concurrent
104 * update of mems_allowed. It is up to the caller to retry the operation if
105 * appropriate.
106 */
107static inline bool read_mems_allowed_retry(unsigned int seq)
108{
109 return read_seqcount_retry(¤t->mems_allowed_seq, seq);
110}
111
112static inline void set_mems_allowed(nodemask_t nodemask)
113{
114 unsigned long flags;
115
116 task_lock(current);
117 local_irq_save(flags);
118 write_seqcount_begin(¤t->mems_allowed_seq);
119 current->mems_allowed = nodemask;
120 write_seqcount_end(¤t->mems_allowed_seq);
121 local_irq_restore(flags);
122 task_unlock(current);
123}
124
125#else /* !CONFIG_CPUSETS */
126
127static inline int cpuset_init(void) { return 0; }
128static inline void cpuset_init_smp(void) {}
129
130static inline void cpuset_update_active_cpus(bool cpu_online)
131{
132 partition_sched_domains(1, NULL, NULL);
133}
134
135static inline void cpuset_cpus_allowed(struct task_struct *p,
136 struct cpumask *mask)
137{
138 cpumask_copy(mask, cpu_possible_mask);
139}
140
141static inline void cpuset_cpus_allowed_fallback(struct task_struct *p)
142{
143}
144
145static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)
146{
147 return node_possible_map;
148}
149
150#define cpuset_current_mems_allowed (node_states[N_MEMORY])
151static inline void cpuset_init_current_mems_allowed(void) {}
152
153static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask)
154{
155 return 1;
156}
157
158static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask)
159{
160 return 1;
161}
162
163static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask)
164{
165 return 1;
166}
167
168static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
169{
170 return 1;
171}
172
173static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask)
174{
175 return 1;
176}
177
178static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
179 const struct task_struct *tsk2)
180{
181 return 1;
182}
183
184static inline void cpuset_memory_pressure_bump(void) {}
185
186static inline void cpuset_task_status_allowed(struct seq_file *m,
187 struct task_struct *task)
188{
189}
190
191static inline int cpuset_mem_spread_node(void)
192{
193 return 0;
194}
195
196static inline int cpuset_slab_spread_node(void)
197{
198 return 0;
199}
200
201static inline int cpuset_do_page_mem_spread(void)
202{
203 return 0;
204}
205
206static inline int cpuset_do_slab_mem_spread(void)
207{
208 return 0;
209}
210
211static inline int current_cpuset_is_being_rebound(void)
212{
213 return 0;
214}
215
216static inline void rebuild_sched_domains(void)
217{
218 partition_sched_domains(1, NULL, NULL);
219}
220
221static inline void cpuset_print_task_mems_allowed(struct task_struct *p)
222{
223}
224
225static inline void set_mems_allowed(nodemask_t nodemask)
226{
227}
228
229static inline unsigned int read_mems_allowed_begin(void)
230{
231 return 0;
232}
233
234static inline bool read_mems_allowed_retry(unsigned int seq)
235{
236 return false;
237}
238
239#endif /* !CONFIG_CPUSETS */
240
241#endif /* _LINUX_CPUSET_H */