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![Linus Torvalds](/assets/img/avatar_default.png)
Pull scheduler fixes from Ingo Molnar. * 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: cpusets: Remove an unused variable sched/rt: Improve pick_next_highest_task_rt() sched: Fix select_fallback_rq() vs cpu_active/cpu_online sched/x86/smp: Do not enable IRQs over calibrate_delay() sched: Fix compiler warning about declared inline after use MAINTAINERS: Update email address for SCHEDULER and PERF EVENTS
238 lines
5.6 KiB
C
238 lines
5.6 KiB
C
#ifndef _LINUX_CPUSET_H
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#define _LINUX_CPUSET_H
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/*
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* cpuset interface
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*
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* Copyright (C) 2003 BULL SA
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* Copyright (C) 2004-2006 Silicon Graphics, Inc.
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*
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*/
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#include <linux/sched.h>
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#include <linux/cpumask.h>
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#include <linux/nodemask.h>
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#include <linux/cgroup.h>
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#include <linux/mm.h>
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#ifdef CONFIG_CPUSETS
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extern int number_of_cpusets; /* How many cpusets are defined in system? */
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extern int cpuset_init(void);
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extern void cpuset_init_smp(void);
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extern void cpuset_update_active_cpus(void);
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extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask);
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extern void cpuset_cpus_allowed_fallback(struct task_struct *p);
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extern nodemask_t cpuset_mems_allowed(struct task_struct *p);
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#define cpuset_current_mems_allowed (current->mems_allowed)
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void cpuset_init_current_mems_allowed(void);
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int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask);
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extern int __cpuset_node_allowed_softwall(int node, gfp_t gfp_mask);
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extern int __cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask);
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static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask)
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{
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return number_of_cpusets <= 1 ||
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__cpuset_node_allowed_softwall(node, gfp_mask);
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}
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static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask)
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{
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return number_of_cpusets <= 1 ||
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__cpuset_node_allowed_hardwall(node, gfp_mask);
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}
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static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
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{
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return cpuset_node_allowed_softwall(zone_to_nid(z), gfp_mask);
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}
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static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask)
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{
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return cpuset_node_allowed_hardwall(zone_to_nid(z), gfp_mask);
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}
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extern int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
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const struct task_struct *tsk2);
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#define cpuset_memory_pressure_bump() \
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do { \
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if (cpuset_memory_pressure_enabled) \
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__cpuset_memory_pressure_bump(); \
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} while (0)
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extern int cpuset_memory_pressure_enabled;
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extern void __cpuset_memory_pressure_bump(void);
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extern const struct file_operations proc_cpuset_operations;
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struct seq_file;
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extern void cpuset_task_status_allowed(struct seq_file *m,
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struct task_struct *task);
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extern int cpuset_mem_spread_node(void);
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extern int cpuset_slab_spread_node(void);
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static inline int cpuset_do_page_mem_spread(void)
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{
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return current->flags & PF_SPREAD_PAGE;
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}
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static inline int cpuset_do_slab_mem_spread(void)
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{
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return current->flags & PF_SPREAD_SLAB;
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}
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extern int current_cpuset_is_being_rebound(void);
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extern void rebuild_sched_domains(void);
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extern void cpuset_print_task_mems_allowed(struct task_struct *p);
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/*
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* get_mems_allowed is required when making decisions involving mems_allowed
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* such as during page allocation. mems_allowed can be updated in parallel
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* and depending on the new value an operation can fail potentially causing
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* process failure. A retry loop with get_mems_allowed and put_mems_allowed
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* prevents these artificial failures.
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*/
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static inline unsigned int get_mems_allowed(void)
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{
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return read_seqcount_begin(¤t->mems_allowed_seq);
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}
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/*
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* If this returns false, the operation that took place after get_mems_allowed
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* may have failed. It is up to the caller to retry the operation if
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* appropriate.
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*/
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static inline bool put_mems_allowed(unsigned int seq)
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{
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return !read_seqcount_retry(¤t->mems_allowed_seq, seq);
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}
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static inline void set_mems_allowed(nodemask_t nodemask)
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{
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task_lock(current);
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write_seqcount_begin(¤t->mems_allowed_seq);
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current->mems_allowed = nodemask;
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write_seqcount_end(¤t->mems_allowed_seq);
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task_unlock(current);
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}
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#else /* !CONFIG_CPUSETS */
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static inline int cpuset_init(void) { return 0; }
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static inline void cpuset_init_smp(void) {}
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static inline void cpuset_update_active_cpus(void)
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{
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partition_sched_domains(1, NULL, NULL);
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}
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static inline void cpuset_cpus_allowed(struct task_struct *p,
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struct cpumask *mask)
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{
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cpumask_copy(mask, cpu_possible_mask);
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}
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static inline void cpuset_cpus_allowed_fallback(struct task_struct *p)
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{
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}
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static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)
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{
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return node_possible_map;
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}
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#define cpuset_current_mems_allowed (node_states[N_HIGH_MEMORY])
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static inline void cpuset_init_current_mems_allowed(void) {}
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static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask)
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{
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return 1;
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}
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static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask)
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{
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return 1;
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}
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static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask)
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{
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return 1;
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}
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static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
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{
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return 1;
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}
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static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask)
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{
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return 1;
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}
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static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
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const struct task_struct *tsk2)
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{
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return 1;
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}
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static inline void cpuset_memory_pressure_bump(void) {}
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static inline void cpuset_task_status_allowed(struct seq_file *m,
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struct task_struct *task)
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{
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}
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static inline int cpuset_mem_spread_node(void)
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{
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return 0;
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}
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static inline int cpuset_slab_spread_node(void)
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{
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return 0;
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}
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static inline int cpuset_do_page_mem_spread(void)
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{
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return 0;
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}
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static inline int cpuset_do_slab_mem_spread(void)
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{
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return 0;
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}
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static inline int current_cpuset_is_being_rebound(void)
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{
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return 0;
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}
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static inline void rebuild_sched_domains(void)
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{
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partition_sched_domains(1, NULL, NULL);
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}
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static inline void cpuset_print_task_mems_allowed(struct task_struct *p)
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{
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}
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static inline void set_mems_allowed(nodemask_t nodemask)
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{
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}
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static inline unsigned int get_mems_allowed(void)
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{
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return 0;
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}
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static inline bool put_mems_allowed(unsigned int seq)
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{
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return true;
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}
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#endif /* !CONFIG_CPUSETS */
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#endif /* _LINUX_CPUSET_H */
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