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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316/* SPDX-License-Identifier: GPL-2.0 */#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/sched/topology.h>#include <linux/sched/task.h>#include <linux/cpumask.h>#include <linux/nodemask.h>#include <linux/mm.h>#include <linux/mmu_context.h>#include <linux/jump_label.h>
extern bool lockdep_is_cpuset_held(void);
#ifdef CONFIG_CPUSETS
/* * Static branch rewrites can happen in an arbitrary order for a given * key. In code paths where we need to loop with read_mems_allowed_begin() and * read_mems_allowed_retry() to get a consistent view of mems_allowed, we need * to ensure that begin() always gets rewritten before retry() in the * disabled -> enabled transition. If not, then if local irqs are disabled * around the loop, we can deadlock since retry() would always be * comparing the latest value of the mems_allowed seqcount against 0 as * begin() still would see cpusets_enabled() as false. The enabled -> disabled * transition should happen in reverse order for the same reasons (want to stop * looking at real value of mems_allowed.sequence in retry() first). */extern struct static_key_false cpusets_pre_enable_key;extern struct static_key_false cpusets_enabled_key;extern struct static_key_false cpusets_insane_config_key;
static inline bool cpusets_enabled(void){ return static_branch_unlikely(&cpusets_enabled_key);}
static inline void cpuset_inc(void){ static_branch_inc_cpuslocked(&cpusets_pre_enable_key); static_branch_inc_cpuslocked(&cpusets_enabled_key);}
static inline void cpuset_dec(void){ static_branch_dec_cpuslocked(&cpusets_enabled_key); static_branch_dec_cpuslocked(&cpusets_pre_enable_key);}
/* * This will get enabled whenever a cpuset configuration is considered * unsupportable in general. E.g. movable only node which cannot satisfy * any non movable allocations (see update_nodemask). Page allocator * needs to make additional checks for those configurations and this * check is meant to guard those checks without any overhead for sane * configurations. */static inline bool cpusets_insane_config(void){ return static_branch_unlikely(&cpusets_insane_config_key);}
extern int cpuset_init(void);extern void cpuset_init_smp(void);extern void cpuset_force_rebuild(void);extern void cpuset_update_active_cpus(void);extern void inc_dl_tasks_cs(struct task_struct *task);extern void dec_dl_tasks_cs(struct task_struct *task);extern void cpuset_lock(void);extern void cpuset_unlock(void);extern void lockdep_assert_cpuset_lock_held(void);extern void cpuset_cpus_allowed_locked(struct task_struct *p, struct cpumask *mask);extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask);extern bool cpuset_cpus_allowed_fallback(struct task_struct *p);extern int cpuset_num_cpus(struct cgroup *cgroup);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(const nodemask_t *nodemask);
extern bool cpuset_current_node_allowed(int node, gfp_t gfp_mask);
static inline bool __cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask){ return cpuset_current_node_allowed(zone_to_nid(z), gfp_mask);}
static inline bool cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask){ if (cpusets_enabled()) return __cpuset_zone_allowed(z, gfp_mask); return true;}
extern int cpuset_mems_allowed_intersects(const struct task_struct *tsk1, const struct task_struct *tsk2);
#ifdef CONFIG_CPUSETS_V1#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);#elsestatic inline void cpuset_memory_pressure_bump(void) { }#endif
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);
static inline int cpuset_do_page_mem_spread(void){ return task_spread_page(current);}
extern bool current_cpuset_is_being_rebound(void);
extern void dl_rebuild_rd_accounting(void);extern void rebuild_sched_domains(void);
extern void cpuset_print_current_mems_allowed(void);extern void cpuset_reset_sched_domains(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_branch_unlikely(&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_branch_unlikely(&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);}
extern void cpuset_nodes_allowed(struct cgroup *cgroup, nodemask_t *mask);#else /* !CONFIG_CPUSETS */
static inline bool cpusets_enabled(void) { return false; }
static inline bool cpusets_insane_config(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(void){ partition_sched_domains(1, NULL, NULL);}
static inline void inc_dl_tasks_cs(struct task_struct *task) { }static inline void dec_dl_tasks_cs(struct task_struct *task) { }static inline void cpuset_lock(void) { }static inline void cpuset_unlock(void) { }static inline void lockdep_assert_cpuset_lock_held(void) { }
static inline void cpuset_cpus_allowed_locked(struct task_struct *p, struct cpumask *mask){ cpumask_copy(mask, task_cpu_possible_mask(p));}
static inline void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask){ cpuset_cpus_allowed_locked(p, mask);}
static inline bool cpuset_cpus_allowed_fallback(struct task_struct *p){ return false;}
static inline int cpuset_num_cpus(struct cgroup *cgroup){ return num_online_cpus();}
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(const nodemask_t *nodemask){ return 1;}
static inline bool __cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask){ return true;}
static inline bool cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask){ return true;}
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_do_page_mem_spread(void){ return 0;}
static inline bool current_cpuset_is_being_rebound(void){ return false;}
static inline void dl_rebuild_rd_accounting(void){}
static inline void rebuild_sched_domains(void){ guard(cpus_read_lock)(); partition_sched_domains(1, NULL, NULL);}
static inline void cpuset_reset_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;}
static inline void cpuset_nodes_allowed(struct cgroup *cgroup, nodemask_t *mask){ nodes_copy(*mask, node_states[N_MEMORY]);}#endif /* !CONFIG_CPUSETS */
#endif /* _LINUX_CPUSET_H */