1 files changed, 295 insertions, 0 deletions
diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h
new file mode 100644
index 000000000..3d385c81c
--- /dev/null
+++ b/include/linux/mempolicy.h
@@ -0,0 +1,295 @@
+/*
+ * NUMA memory policies for Linux.
+ * Copyright 2003,2004 Andi Kleen SuSE Labs
+ */
+#ifndef _LINUX_MEMPOLICY_H
+#define _LINUX_MEMPOLICY_H 1
+
+
+#include <linux/mmzone.h>
+#include <linux/slab.h>
+#include <linux/rbtree.h>
+#include <linux/spinlock.h>
+#include <linux/nodemask.h>
+#include <linux/pagemap.h>
+#include <uapi/linux/mempolicy.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_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)
+
+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.
+ * 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;
+};
+
+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 *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_task_policy(struct task_struct *p);
+struct mempolicy *__get_vma_policy(struct vm_area_struct *vma,
+		unsigned long addr);
+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,
+				enum mpol_rebind_step step);
+extern void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new);
+
+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 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_TMPFS
+extern 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 */
+static inline int vma_migratable(struct vm_area_struct *vma)
+{
+	if (vma->vm_flags & (VM_IO | VM_PFNMAP))
+		return 0;
+
+#ifndef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
+	if (vma->vm_flags & VM_HUGETLB)
+		return 0;
+#endif
+
+	/*
+	 * 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;
+}
+
+extern int mpol_misplaced(struct page *, struct vm_area_struct *, unsigned long);
+
+#else
+
+struct mempolicy {};
+
+static inline bool mpol_equal(struct mempolicy *a, struct mempolicy *b)
+{
+	return true;
+}
+
+static inline void mpol_put(struct mempolicy *p)
+{
+}
+
+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 *p)
+{
+}
+
+#define vma_policy(vma) NULL
+
+static inline int
+vma_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,
+				enum mpol_rebind_step step)
+{
+}
+
+static inline void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new)
+{
+}
+
+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 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_TMPFS
+static inline int mpol_parse_str(char *str, struct mempolicy **mpol)
+{
+	return 1;	/* error */
+}
+#endif
+
+static inline int mpol_misplaced(struct page *page, struct vm_area_struct *vma,
+				 unsigned long address)
+{
+	return -1; /* no node preference */
+}
+
+#endif /* CONFIG_NUMA */
+#endif