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#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/mm.h>
#include <linux/jump_label.h>
#ifdef CONFIG_CPUSETS
extern struct static_key cpusets_pre_enable_key;
extern struct static_key cpusets_enabled_key;
static inline bool cpusets_enabled(void)
{
return static_key_false(&cpusets_enabled_key);
}
static inline int nr_cpusets(void)
{
/* jump label reference count + the top-level cpuset */
return static_key_count(&cpusets_enabled_key) + 1;
}
static inline void cpuset_inc(void)
{
static_key_slow_inc(&cpusets_pre_enable_key);
static_key_slow_inc(&cpusets_enabled_key);
}
static inline void cpuset_dec(void)
{
static_key_slow_dec(&cpusets_enabled_key);
static_key_slow_dec(&cpusets_pre_enable_key);
}
extern int cpuset_init(void);
extern void cpuset_init_smp(void);
extern void cpuset_force_rebuild(void);
extern void cpuset_update_active_cpus(bool cpu_online);
extern void cpuset_wait_for_hotplug(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(int node, gfp_t gfp_mask);
static inline int cpuset_node_allowed(int node, gfp_t gfp_mask)
{
return nr_cpusets() <= 1 || __cpuset_node_allowed(node, gfp_mask);
}
static inline int cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask)
{
return cpuset_node_allowed(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 void cpuset_task_status_allowed(struct seq_file *m,
struct task_struct *task);
extern int proc_cpuset_show(struct seq_file *m, struct pid_namespace *ns,
struct pid *pid, struct task_struct *tsk);
extern int cpuset_mem_spread_node(void);
extern int cpuset_slab_spread_node(void);
static inline int cpuset_do_page_mem_spread(void)
{
return task_spread_page(current);
}
static inline int cpuset_do_slab_mem_spread(void)
{
return task_spread_slab(current);
}
extern int current_cpuset_is_being_rebound(void);
extern void rebuild_sched_domains(void);
extern void cpuset_print_current_mems_allowed(void);
/*
* read_mems_allowed_begin 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 read_mems_allowed_begin and
* read_mems_allowed_retry prevents these artificial failures.
*/
static inline unsigned int read_mems_allowed_begin(void)
{
if (!static_key_false(&cpusets_pre_enable_key))
return 0;
return read_seqcount_begin(¤t->mems_allowed_seq);
}
/*
* If this returns true, the operation that took place after
* read_mems_allowed_begin may have failed artificially due to a concurrent
* update of mems_allowed. It is up to the caller to retry the operation if
* appropriate.
*/
static inline bool read_mems_allowed_retry(unsigned int seq)
{
if (!static_key_false(&cpusets_enabled_key))
return false;
return read_seqcount_retry(¤t->mems_allowed_seq, seq);
}
static inline void set_mems_allowed(nodemask_t nodemask)
{
unsigned long flags;
task_lock(current);
local_irq_save(flags);
write_seqcount_begin(¤t->mems_allowed_seq);
current->mems_allowed = nodemask;
write_seqcount_end(¤t->mems_allowed_seq);
local_irq_restore(flags);
task_unlock(current);
}
#else /* !CONFIG_CPUSETS */
static inline bool cpusets_enabled(void) { return false; }
static inline int cpuset_init(void) { return 0; }
static inline void cpuset_init_smp(void) {}
static inline void cpuset_force_rebuild(void) { }
static inline void cpuset_update_active_cpus(bool cpu_online)
{
partition_sched_domains(1, NULL, NULL);
}
static inline void cpuset_wait_for_hotplug(void) { }
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_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(int node, gfp_t gfp_mask)
{
return 1;
}
static inline int cpuset_zone_allowed(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_current_mems_allowed(void)
{
}
static inline void set_mems_allowed(nodemask_t nodemask)
{
}
static inline unsigned int read_mems_allowed_begin(void)
{
return 0;
}
static inline bool read_mems_allowed_retry(unsigned int seq)
{
return false;
}
#endif /* !CONFIG_CPUSETS */
#endif /* _LINUX_CPUSET_H */
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