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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 */

#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 vm_area_struct;

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:

 * 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_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 mempolicy default_policy;

extern struct zonelist *huge_zonelist(struct vm_area_struct *vma,

                unsigned long addr, gfp_t gfp_flags, struct mempolicy **mpol);

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;

}

#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_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)

{

        return NODE_DATA(0)->node_zonelists + gfp_zone(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