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#ifndef _LINUX_MEMPOLICY_H #define _LINUX_MEMPOLICY_H 1 #include <linux/errno.h> /* * NUMA memory policies for Linux. * Copyright 2003,2004 Andi Kleen SuSE Labs */ /* Policies */ #define MPOL_DEFAULT 0 #define MPOL_PREFERRED 1 #define MPOL_BIND 2 #define MPOL_INTERLEAVE 3 #define MPOL_MAX MPOL_INTERLEAVE /* Flags for get_mem_policy */ #define MPOL_F_NODE (1<<0) /* return next IL mode instead of node mask */ #define MPOL_F_ADDR (1<<1) /* look up vma using address */ /* Flags for mbind */ #define MPOL_MF_STRICT (1<<0) /* Verify existing pages in the mapping */ #define MPOL_MF_MOVE (1<<1) /* Move pages owned by this process to conform to mapping */ #define MPOL_MF_MOVE_ALL (1<<2) /* Move every page to conform to mapping */ #define MPOL_MF_INTERNAL (1<<3) /* Internal flags start here */ #ifdef __KERNEL__ #include <linux/config.h> #include <linux/mmzone.h> #include <linux/slab.h> #include <linux/rbtree.h> #include <linux/spinlock.h> #include <linux/nodemask.h> struct vm_area_struct; #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 interlave: * 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_sem. * * Freeing policy: * When policy is MPOL_BIND v.zonelist is kmalloc'ed and must be kfree'd. * All other policies don't have any external state. mpol_free() handles this. * * Copying policy objects: * For MPOL_BIND the zonelist must be always duplicated. mpol_clone() does this. */ struct mempolicy { atomic_t refcnt; short policy; /* See MPOL_* above */ union { struct zonelist *zonelist; /* bind */ short preferred_node; /* preferred */ nodemask_t nodes; /* interleave */ /* undefined for default */ } v; nodemask_t cpuset_mems_allowed; /* mempolicy relative to these nodes */ }; /* * 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_free(struct mempolicy *pol); static inline void mpol_free(struct mempolicy *pol) { if (pol) __mpol_free(pol); } extern struct mempolicy *__mpol_copy(struct mempolicy *pol); static inline struct mempolicy *mpol_copy(struct mempolicy *pol) { if (pol) pol = __mpol_copy(pol); return pol; } #define vma_policy(vma) ((vma)->vm_policy) #define vma_set_policy(vma, pol) ((vma)->vm_policy = (pol)) static inline void mpol_get(struct mempolicy *pol) { if (pol) atomic_inc(&pol->refcnt); } extern int __mpol_equal(struct mempolicy *a, struct mempolicy *b); static inline int mpol_equal(struct mempolicy *a, struct mempolicy *b) { if (a == b) return 1; return __mpol_equal(a, b); } #define vma_mpol_equal(a,b) mpol_equal(vma_policy(a), vma_policy(b)) /* Could later add inheritance of the process policy here. */ #define mpol_set_vma_default(vma) ((vma)->vm_policy = NULL) /* * Tree of shared policies for a shared memory region. * Maintain the policies in a pseudo mm that contains vmas. The vmas * carry the policy. As a special twist the pseudo mm is indexed in pages, not * bytes, so that we can work with shared memory segments bigger than * unsigned long. */ struct sp_node { struct rb_node nd; unsigned long start, end; struct mempolicy *policy; }; struct shared_policy { struct rb_root root; spinlock_t lock; }; void mpol_shared_policy_init(struct shared_policy *info, int policy, nodemask_t *nodes); int mpol_set_shared_policy(struct shared_policy *info, struct vm_area_struct *vma, struct mempolicy *new); void mpol_free_shared_policy(struct shared_policy *p); struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx); extern void numa_default_policy(void); extern void numa_policy_init(void); extern void mpol_rebind_policy(struct mempolicy *pol, const nodemask_t *new); 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); #define set_cpuset_being_rebound(x) (cpuset_being_rebound = (x)) #ifdef CONFIG_CPUSET #define current_cpuset_is_being_rebound() \ (cpuset_being_rebound == current->cpuset) #else #define current_cpuset_is_being_rebound() 0 #endif extern struct mempolicy default_policy; extern struct zonelist *huge_zonelist(struct vm_area_struct *vma, unsigned long addr); extern unsigned slab_node(struct mempolicy *policy); extern int policy_zone; static inline void check_highest_zone(int k) { if (k > policy_zone) policy_zone = k; } int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from_nodes, const nodemask_t *to_nodes, int flags); extern void *cpuset_being_rebound; /* Trigger mpol_copy vma rebind */ #else struct mempolicy {}; static inline int mpol_equal(struct mempolicy *a, struct mempolicy *b) { return 1; } #define vma_mpol_equal(a,b) 1 #define mpol_set_vma_default(vma) do {} while(0) static inline void mpol_free(struct mempolicy *p) { } static inline void mpol_get(struct mempolicy *pol) { } static inline struct mempolicy *mpol_copy(struct mempolicy *old) { return NULL; } struct shared_policy {}; static inline int mpol_set_shared_policy(struct shared_policy *info, struct vm_area_struct *vma, struct mempolicy *new) { return -EINVAL; } static inline void mpol_shared_policy_init(struct shared_policy *info, int policy, nodemask_t *nodes) { } static inline void mpol_free_shared_policy(struct shared_policy *p) { } static inline struct mempolicy * mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx) { return NULL; } #define vma_policy(vma) NULL #define vma_set_policy(vma, pol) do {} while(0) static inline void numa_policy_init(void) { } static inline void numa_default_policy(void) { } static inline void mpol_rebind_policy(struct mempolicy *pol, const nodemask_t *new) { } 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) { } #define set_cpuset_being_rebound(x) do {} while (0) static inline struct zonelist *huge_zonelist(struct vm_area_struct *vma, unsigned long addr) { return NODE_DATA(0)->node_zonelists + gfp_zone(GFP_HIGHUSER); } static inline int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from_nodes, const nodemask_t *to_nodes, int flags) { return 0; } static inline void check_highest_zone(int k) { } #endif /* CONFIG_NUMA */ #endif /* __KERNEL__ */ #endif