1 files changed, 385 insertions, 0 deletions
diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h
new file mode 100644
index 00000000..7978eec1
--- /dev/null
+++ b/include/linux/mempolicy.h
@@ -0,0 +1,385 @@
+#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 */
+};
+
+enum mpol_rebind_step {
+	MPOL_REBIND_ONCE,	/* do rebind work at once(not by two step) */
+	MPOL_REBIND_STEP1,	/* first step(set all the newly nodes) */
+	MPOL_REBIND_STEP2,	/* second step(clean all the disallowed nodes)*/
+	MPOL_REBIND_NSTEP,
+};
+
+/* 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 */
+
+/*
+ * Internal flags that share the struct mempolicy flags word with
+ * "mode flags".  These flags are allocated from bit 0 up, as they
+ * are never OR'ed into the mode in mempolicy API arguments.
+ */
+#define MPOL_F_SHARED  (1 << 0)	/* identify shared policies */
+#define MPOL_F_LOCAL   (1 << 1)	/* preferred local allocation */
+#define MPOL_F_REBINDING (1 << 2)	/* identify policies in rebinding */
+
+#ifdef __KERNEL__
+
+#include <linux/mmzone.h>
+#include <linux/slab.h>
+#include <linux/rbtree.h>
+#include <linux/spinlock.h>
+#include <linux/nodemask.h>
+#include <linux/pagemap.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.
+ *
+ * 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 */
+	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);
+}
+
+/*
+ * 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_cond_copy(struct mempolicy *tompol,
+					  struct mempolicy *frompol);
+static inline struct mempolicy *mpol_cond_copy(struct mempolicy *tompol,
+						struct mempolicy *frompol)
+{
+	if (!frompol)
+		return frompol;
+	return __mpol_cond_copy(tompol, frompol);
+}
+
+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;
+}
+
+#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 *sp, struct mempolicy *mpol);
+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);
+
+struct mempolicy *get_vma_policy(struct task_struct *tsk,
+		struct vm_area_struct *vma, unsigned long addr);
+
+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,
+				enum mpol_rebind_step step);
+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 bool init_nodemask_of_mempolicy(nodemask_t *mask);
+extern bool mempolicy_nodemask_intersects(struct task_struct *tsk,
+				const nodemask_t *mask);
+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);
+
+
+#ifdef CONFIG_TMPFS
+extern int mpol_parse_str(char *str, struct mempolicy **mpol, int no_context);
+#endif
+
+extern int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol,
+			int no_context);
+
+/* Check if a vma is migratable */
+static inline int vma_migratable(struct vm_area_struct *vma)
+{
+	if (vma->vm_flags & (VM_IO|VM_HUGETLB|VM_PFNMAP|VM_RESERVED))
+		return 0;
+	/*
+	 * Migration allocates pages in the highest zone. If we cannot
+	 * do so then migration (at least from node to node) is not
+	 * possible.
+	 */
+	if (vma->vm_file &&
+		gfp_zone(mapping_gfp_mask(vma->vm_file->f_mapping))
+								< policy_zone)
+			return 0;
+	return 1;
+}
+
+#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_cond_put(struct mempolicy *pol)
+{
+}
+
+static inline struct mempolicy *mpol_cond_copy(struct mempolicy *to,
+						struct mempolicy *from)
+{
+	return from;
+}
+
+static inline void mpol_get(struct mempolicy *pol)
+{
+}
+
+static inline struct mempolicy *mpol_dup(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 *sp,
+						struct mempolicy *mpol)
+{
+}
+
+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,
+				enum mpol_rebind_step step)
+{
+}
+
+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 bool init_nodemask_of_mempolicy(nodemask_t *m)
+{
+	return false;
+}
+
+static inline bool mempolicy_nodemask_intersects(struct task_struct *tsk,
+			const nodemask_t *mask)
+{
+	return false;
+}
+
+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)
+{
+}
+
+#ifdef CONFIG_TMPFS
+static inline int mpol_parse_str(char *str, struct mempolicy **mpol,
+				int no_context)
+{
+	return 1;	/* error */
+}
+#endif
+
+static inline int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol,
+				int no_context)
+{
+	return 0;
+}
+
+#endif /* CONFIG_NUMA */
+#endif /* __KERNEL__ */
+
+#endif