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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308/* SPDX-License-Identifier: GPL-2.0 *//* * NUMA memory policies for Linux. * Copyright 2003,2004 Andi Kleen SuSE Labs */#ifndef _LINUX_MEMPOLICY_H#define _LINUX_MEMPOLICY_H 1
#include <linux/sched.h>#include <linux/mmzone.h>#include <linux/slab.h>#include <linux/rbtree.h>#include <linux/spinlock.h>#include <linux/node.h>#include <linux/nodemask.h>#include <linux/pagemap.h>#include <uapi/linux/mempolicy.h>
struct mm_struct;
#define NO_INTERLEAVE_INDEX (-1UL) /* use task il_prev for interleaving */
#ifdef CONFIG_NUMA
/* * Describe a memory policy. * * A mempolicy can be either associated with a process or with a VMA. * For VMA related allocations the VMA policy is preferred, otherwise * the process policy is used. Interrupts ignore the memory policy * of the current process. * * Locking policy for interleave: * In process context there is no locking because only the process accesses * its own state. All vma manipulation is somewhat protected by a down_read on * mmap_lock. * * Freeing policy: * Mempolicy objects are reference counted. A mempolicy will be freed when * mpol_put() decrements the reference count to zero. * * Duplicating policy objects: * mpol_dup() allocates a new mempolicy and copies the specified mempolicy * to the new storage. The reference count of the new object is initialized * to 1, representing the caller of mpol_dup(). */struct mempolicy { atomic_t refcnt; unsigned short mode; /* See MPOL_* above */ unsigned short flags; /* See set_mempolicy() MPOL_F_* above */ nodemask_t nodes; /* interleave/bind/preferred/etc */ int home_node; /* Home node to use for MPOL_BIND and MPOL_PREFERRED_MANY */
union { nodemask_t cpuset_mems_allowed; /* relative to these nodes */ nodemask_t user_nodemask; /* nodemask passed by user */ } w; struct rcu_head rcu;};
/* * Support for managing mempolicy data objects (clone, copy, destroy) * The default fast path of a NULL MPOL_DEFAULT policy is always inlined. */
extern void __mpol_put(struct mempolicy *pol);static inline void mpol_put(struct mempolicy *pol){ if (pol) __mpol_put(pol);}
/* * Does mempolicy pol need explicit unref after use? * Currently only needed for shared policies. */static inline int mpol_needs_cond_ref(struct mempolicy *pol){ return (pol && (pol->flags & MPOL_F_SHARED));}
static inline void mpol_cond_put(struct mempolicy *pol){ if (mpol_needs_cond_ref(pol)) __mpol_put(pol);}
extern struct mempolicy *__mpol_dup(struct mempolicy *pol);static inline struct mempolicy *mpol_dup(struct mempolicy *pol){ if (pol) pol = __mpol_dup(pol); return pol;}
static inline void mpol_get(struct mempolicy *pol){ if (pol) atomic_inc(&pol->refcnt);}
extern bool __mpol_equal(struct mempolicy *a, struct mempolicy *b);static inline bool mpol_equal(struct mempolicy *a, struct mempolicy *b){ if (a == b) return true; return __mpol_equal(a, b);}
/* * Tree of shared policies for a shared memory region. */struct shared_policy { struct rb_root root; rwlock_t lock;};struct sp_node { struct rb_node nd; pgoff_t start, end; struct mempolicy *policy;};
int vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst);void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol);int mpol_set_shared_policy(struct shared_policy *sp, struct vm_area_struct *vma, struct mempolicy *mpol);void mpol_free_shared_policy(struct shared_policy *sp);struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp, pgoff_t idx);
struct mempolicy *get_task_policy(struct task_struct *p);struct mempolicy *__get_vma_policy(struct vm_area_struct *vma, unsigned long addr, pgoff_t *ilx);struct mempolicy *get_vma_policy(struct vm_area_struct *vma, unsigned long addr, int order, pgoff_t *ilx);bool vma_policy_mof(struct vm_area_struct *vma);
extern void numa_default_policy(void);extern void numa_policy_init(void);extern void mpol_rebind_task(struct task_struct *tsk, const nodemask_t *new);extern void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new);
extern int huge_node(struct vm_area_struct *vma, unsigned long addr, gfp_t gfp_flags, struct mempolicy **mpol, nodemask_t **nodemask);extern bool init_nodemask_of_mempolicy(nodemask_t *mask);extern bool mempolicy_in_oom_domain(struct task_struct *tsk, const nodemask_t *mask);extern unsigned int mempolicy_slab_node(void);
extern enum zone_type policy_zone;
static inline void check_highest_zone(enum zone_type k){ if (k > policy_zone && k != ZONE_MOVABLE) policy_zone = k;}
int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from, const nodemask_t *to, int flags);
#ifdef CONFIG_TMPFSextern int mpol_parse_str(char *str, struct mempolicy **mpol);#endif
extern void mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol);
/* Check if a vma is migratable */extern bool vma_migratable(struct vm_area_struct *vma);
int mpol_misplaced(struct folio *folio, struct vm_fault *vmf, unsigned long addr);extern void mpol_put_task_policy(struct task_struct *);
static inline bool mpol_is_preferred_many(struct mempolicy *pol){ return (pol->mode == MPOL_PREFERRED_MANY);}
extern bool apply_policy_zone(struct mempolicy *policy, enum zone_type zone);
extern int mempolicy_set_node_perf(unsigned int node, struct access_coordinate *coords);
#else
struct mempolicy {};
static inline struct mempolicy *get_task_policy(struct task_struct *p){ return NULL;}
static inline bool mpol_equal(struct mempolicy *a, struct mempolicy *b){ return true;}
static inline void mpol_put(struct mempolicy *pol){}
static inline void mpol_cond_put(struct mempolicy *pol){}
static inline void mpol_get(struct mempolicy *pol){}
struct shared_policy {};
static inline void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol){}
static inline void mpol_free_shared_policy(struct shared_policy *sp){}
static inline struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp, pgoff_t idx){ return NULL;}
static inline struct mempolicy *get_vma_policy(struct vm_area_struct *vma, unsigned long addr, int order, pgoff_t *ilx){ *ilx = 0; return NULL;}
static inline intvma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst){ return 0;}
static inline void numa_policy_init(void){}
static inline void numa_default_policy(void){}
static inline void mpol_rebind_task(struct task_struct *tsk, const nodemask_t *new){}
static inline void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new){}
static inline int huge_node(struct vm_area_struct *vma, unsigned long addr, gfp_t gfp_flags, struct mempolicy **mpol, nodemask_t **nodemask){ *mpol = NULL; *nodemask = NULL; return 0;}
static inline bool init_nodemask_of_mempolicy(nodemask_t *m){ return false;}
static inline int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from, const nodemask_t *to, int flags){ return 0;}
static inline void check_highest_zone(int k){}
#ifdef CONFIG_TMPFSstatic inline int mpol_parse_str(char *str, struct mempolicy **mpol){ return 1; /* error */}#endif
static inline int mpol_misplaced(struct folio *folio, struct vm_fault *vmf, unsigned long address){ return -1; /* no node preference */}
static inline void mpol_put_task_policy(struct task_struct *task){}
static inline bool mpol_is_preferred_many(struct mempolicy *pol){ return false;}
#endif /* CONFIG_NUMA */#endif