1 files changed, 229 insertions, 0 deletions
diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h
new file mode 100644
index 00000000000..8480aef10e6
--- /dev/null
+++ b/include/linux/mempolicy.h
@@ -0,0 +1,229 @@
+#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 */
+
+#ifdef __KERNEL__
+
+#include <linux/config.h>
+#include <linux/mmzone.h>
+#include <linux/bitmap.h>
+#include <linux/slab.h>
+#include <linux/rbtree.h>
+#include <linux/spinlock.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. For allocating in the interleave policy the page_table_lock
+ * must be also aquired to protect il_next.
+ *
+ * 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 */
+		DECLARE_BITMAP(nodes, MAX_NUMNODES); /* interleave */
+		/* undefined for default */
+	} v;
+};
+
+/*
+ * 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)
+
+/*
+ * Hugetlb policy. i386 hugetlb so far works with node numbers
+ * instead of zone lists, so give it special interfaces for now.
+ */
+extern int mpol_first_node(struct vm_area_struct *vma, unsigned long addr);
+extern int mpol_node_valid(int nid, struct vm_area_struct *vma,
+			unsigned long addr);
+
+/*
+ * 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;
+};
+
+static inline void mpol_shared_policy_init(struct shared_policy *info)
+{
+	info->root = RB_ROOT;
+	spin_lock_init(&info->lock);
+}
+
+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);
+
+#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;
+}
+
+static inline int mpol_first_node(struct vm_area_struct *vma, unsigned long a)
+{
+	return numa_node_id();
+}
+
+static inline int
+mpol_node_valid(int nid, struct vm_area_struct *vma, unsigned long a)
+{
+	return 1;
+}
+
+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)
+{
+}
+
+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)
+{
+}
+
+#endif /* CONFIG_NUMA */
+#endif /* __KERNEL__ */
+
+#endif