| #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 |
| */ |
| |
| /* |
| * Both the MPOL_* mempolicy mode and the MPOL_F_* optional mode flags are |
| * passed by the user to either set_mempolicy() or mbind() in an 'int' actual. |
| * The MPOL_MODE_FLAGS macro determines the legal set of optional mode flags. |
| */ |
| |
| /* Policies */ |
| enum { |
| MPOL_DEFAULT, |
| MPOL_PREFERRED, |
| MPOL_BIND, |
| MPOL_INTERLEAVE, |
| MPOL_MAX, /* always last member of enum */ |
| }; |
| |
| /* Flags for set_mempolicy */ |
| #define MPOL_F_STATIC_NODES (1 << 15) |
| #define MPOL_F_RELATIVE_NODES (1 << 14) |
| |
| /* |
| * MPOL_MODE_FLAGS is the union of all possible optional mode flags passed to |
| * either set_mempolicy() or mbind(). |
| */ |
| #define MPOL_MODE_FLAGS (MPOL_F_STATIC_NODES | MPOL_F_RELATIVE_NODES) |
| |
| /* Flags for get_mempolicy */ |
| #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 */ |
| #define MPOL_F_MEMS_ALLOWED (1<<2) /* return allowed memories */ |
| |
| /* 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/mmzone.h> |
| #include <linux/slab.h> |
| #include <linux/rbtree.h> |
| #include <linux/spinlock.h> |
| #include <linux/nodemask.h> |
| |
| struct mm_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: |
| * Mempolicy objects are reference counted. A mempolicy will be freed when |
| * mpol_put() decrements the reference count to zero. |
| * |
| * Copying policy objects: |
| * mpol_copy() 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_copy(). |
| */ |
| struct mempolicy { |
| atomic_t refcnt; |
| unsigned short policy; /* See MPOL_* above */ |
| unsigned short flags; /* See set_mempolicy() MPOL_F_* above */ |
| union { |
| short preferred_node; /* preferred */ |
| nodemask_t nodes; /* interleave/bind */ |
| /* undefined for default */ |
| } v; |
| union { |
| nodemask_t cpuset_mems_allowed; /* relative to these nodes */ |
| nodemask_t user_nodemask; /* nodemask passed by user */ |
| } w; |
| }; |
| |
| /* |
| * 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); |
| } |
| |
| 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); |
| } |
| |
| /* |
| * 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, unsigned short policy, |
| unsigned short flags, 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_task(struct task_struct *tsk, |
| const nodemask_t *new); |
| extern void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new); |
| extern void mpol_fix_fork_child_flag(struct task_struct *p); |
| |
| extern struct zonelist *huge_zonelist(struct vm_area_struct *vma, |
| unsigned long addr, gfp_t gfp_flags, |
| struct mempolicy **mpol, nodemask_t **nodemask); |
| extern unsigned slab_node(struct mempolicy *policy); |
| |
| 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_nodes, const nodemask_t *to_nodes, int flags); |
| |
| #else |
| |
| struct mempolicy {}; |
| |
| static inline int mpol_equal(struct mempolicy *a, struct mempolicy *b) |
| { |
| return 1; |
| } |
| |
| static inline void mpol_put(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, |
| unsigned short policy, unsigned short flags, 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_task(struct task_struct *tsk, |
| const nodemask_t *new) |
| { |
| } |
| |
| static inline void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new) |
| { |
| } |
| |
| static inline void mpol_fix_fork_child_flag(struct task_struct *p) |
| { |
| } |
| |
| static inline struct zonelist *huge_zonelist(struct vm_area_struct *vma, |
| unsigned long addr, gfp_t gfp_flags, |
| struct mempolicy **mpol, nodemask_t **nodemask) |
| { |
| *mpol = NULL; |
| *nodemask = NULL; |
| return node_zonelist(0, gfp_flags); |
| } |
| |
| 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 |