diff options
Diffstat (limited to 'include/linux/cpuset.h')
| -rw-r--r-- | include/linux/cpuset.h | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h new file mode 100644 index 00000000..668f66ba --- /dev/null +++ b/include/linux/cpuset.h @@ -0,0 +1,238 @@ +#ifndef _LINUX_CPUSET_H +#define _LINUX_CPUSET_H +/* + * cpuset interface + * + * Copyright (C) 2003 BULL SA + * Copyright (C) 2004-2006 Silicon Graphics, Inc. + * + */ + +#include <linux/sched.h> +#include <linux/cpumask.h> +#include <linux/nodemask.h> +#include <linux/cgroup.h> +#include <linux/mm.h> + +#ifdef CONFIG_CPUSETS + +extern int number_of_cpusets; /* How many cpusets are defined in system? */ + +extern int cpuset_init(void); +extern void cpuset_init_smp(void); +extern void cpuset_update_active_cpus(void); +extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask); +extern void cpuset_cpus_allowed_fallback(struct task_struct *p); +extern nodemask_t cpuset_mems_allowed(struct task_struct *p); +#define cpuset_current_mems_allowed (current->mems_allowed) +void cpuset_init_current_mems_allowed(void); +int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask); + +extern int __cpuset_node_allowed_softwall(int node, gfp_t gfp_mask); +extern int __cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask); + +static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask) +{ + return number_of_cpusets <= 1 || + __cpuset_node_allowed_softwall(node, gfp_mask); +} + +static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask) +{ + return number_of_cpusets <= 1 || + __cpuset_node_allowed_hardwall(node, gfp_mask); +} + +static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask) +{ + return cpuset_node_allowed_softwall(zone_to_nid(z), gfp_mask); +} + +static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask) +{ + return cpuset_node_allowed_hardwall(zone_to_nid(z), gfp_mask); +} + +extern int cpuset_mems_allowed_intersects(const struct task_struct *tsk1, + const struct task_struct *tsk2); + +#define cpuset_memory_pressure_bump() \ + do { \ + if (cpuset_memory_pressure_enabled) \ + __cpuset_memory_pressure_bump(); \ + } while (0) +extern int cpuset_memory_pressure_enabled; +extern void __cpuset_memory_pressure_bump(void); + +extern const struct file_operations proc_cpuset_operations; +struct seq_file; +extern void cpuset_task_status_allowed(struct seq_file *m, + struct task_struct *task); + +extern int cpuset_mem_spread_node(void); +extern int cpuset_slab_spread_node(void); + +static inline int cpuset_do_page_mem_spread(void) +{ + return current->flags & PF_SPREAD_PAGE; +} + +static inline int cpuset_do_slab_mem_spread(void) +{ + return current->flags & PF_SPREAD_SLAB; +} + +extern int current_cpuset_is_being_rebound(void); + +extern void rebuild_sched_domains(void); + +extern void cpuset_print_task_mems_allowed(struct task_struct *p); + +/* + * get_mems_allowed is required when making decisions involving mems_allowed + * such as during page allocation. mems_allowed can be updated in parallel + * and depending on the new value an operation can fail potentially causing + * process failure. A retry loop with get_mems_allowed and put_mems_allowed + * prevents these artificial failures. + */ +static inline unsigned int get_mems_allowed(void) +{ + return read_seqcount_begin(¤t->mems_allowed_seq); +} + +/* + * If this returns false, the operation that took place after get_mems_allowed + * may have failed. It is up to the caller to retry the operation if + * appropriate. + */ +static inline bool put_mems_allowed(unsigned int seq) +{ + return !read_seqcount_retry(¤t->mems_allowed_seq, seq); +} + +static inline void set_mems_allowed(nodemask_t nodemask) +{ + task_lock(current); + write_seqcount_begin(¤t->mems_allowed_seq); + current->mems_allowed = nodemask; + write_seqcount_end(¤t->mems_allowed_seq); + task_unlock(current); +} + +#else /* !CONFIG_CPUSETS */ + +static inline int cpuset_init(void) { return 0; } +static inline void cpuset_init_smp(void) {} + +static inline void cpuset_update_active_cpus(void) +{ + partition_sched_domains(1, NULL, NULL); +} + +static inline void cpuset_cpus_allowed(struct task_struct *p, + struct cpumask *mask) +{ + cpumask_copy(mask, cpu_possible_mask); +} + +static inline void cpuset_cpus_allowed_fallback(struct task_struct *p) +{ +} + +static inline nodemask_t cpuset_mems_allowed(struct task_struct *p) +{ + return node_possible_map; +} + +#define cpuset_current_mems_allowed (node_states[N_HIGH_MEMORY]) +static inline void cpuset_init_current_mems_allowed(void) {} + +static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask) +{ + return 1; +} + +static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask) +{ + return 1; +} + +static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask) +{ + return 1; +} + +static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask) +{ + return 1; +} + +static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask) +{ + return 1; +} + +static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1, + const struct task_struct *tsk2) +{ + return 1; +} + +static inline void cpuset_memory_pressure_bump(void) {} + +static inline void cpuset_task_status_allowed(struct seq_file *m, + struct task_struct *task) +{ +} + +static inline int cpuset_mem_spread_node(void) +{ + return 0; +} + +static inline int cpuset_slab_spread_node(void) +{ + return 0; +} + +static inline int cpuset_do_page_mem_spread(void) +{ + return 0; +} + +static inline int cpuset_do_slab_mem_spread(void) +{ + return 0; +} + +static inline int current_cpuset_is_being_rebound(void) +{ + return 0; +} + +static inline void rebuild_sched_domains(void) +{ + partition_sched_domains(1, NULL, NULL); +} + +static inline void cpuset_print_task_mems_allowed(struct task_struct *p) +{ +} + +static inline void set_mems_allowed(nodemask_t nodemask) +{ +} + +static inline unsigned int get_mems_allowed(void) +{ + return 0; +} + +static inline bool put_mems_allowed(unsigned int seq) +{ + return true; +} + +#endif /* !CONFIG_CPUSETS */ + +#endif /* _LINUX_CPUSET_H */ |