* 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 */
-#define MPOL_DEFAULT 0
-#define MPOL_PREFERRED 1
-#define MPOL_BIND 2
-#define MPOL_INTERLEAVE 3
+enum {
+ MPOL_DEFAULT,
+ MPOL_PREFERRED,
+ MPOL_BIND,
+ MPOL_INTERLEAVE,
+ MPOL_MAX, /* always last member of enum */
+};
-#define MPOL_MAX MPOL_INTERLEAVE
+/* Flags for set_mempolicy */
+#define MPOL_F_STATIC_NODES (1 << 15)
+
+/*
+ * 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)
-/* Flags for get_mem_policy */
+/* 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 */
* 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.
+ * Mempolicy objects are reference counted. A mempolicy will be freed when
+ * mpol_free() decrements the reference count to zero.
*
* Copying policy objects:
- * For MPOL_BIND the zonelist must be always duplicated. mpol_clone() does this.
+ * 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;
- short policy; /* See MPOL_* above */
+ unsigned short policy; /* See MPOL_* above */
+ unsigned short flags; /* See set_mempolicy() MPOL_F_* above */
union {
- struct zonelist *zonelist; /* bind */
short preferred_node; /* preferred */
- nodemask_t nodes; /* interleave */
+ nodemask_t nodes; /* interleave/bind */
/* undefined for default */
} v;
- nodemask_t cpuset_mems_allowed; /* mempolicy relative to these nodes */
+ union {
+ nodemask_t cpuset_mems_allowed; /* relative to these nodes */
+ nodemask_t user_nodemask; /* nodemask passed by user */
+ } w;
};
/*
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. */
spinlock_t lock;
};
-void mpol_shared_policy_init(struct shared_policy *info, int policy,
- nodemask_t *nodes);
+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);
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);
-#define set_cpuset_being_rebound(x) (cpuset_being_rebound = (x))
-
-#ifdef CONFIG_CPUSETS
-#define current_cpuset_is_being_rebound() \
- (cpuset_being_rebound == current->cpuset)
-#else
-#define current_cpuset_is_being_rebound() 0
-#endif
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);
+ 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;
int do_migrate_pages(struct mm_struct *mm,
const nodemask_t *from_nodes, const nodemask_t *to_nodes, int flags);
-extern void *cpuset_being_rebound; /* Trigger mpol_copy vma rebind */
-
#else
struct mempolicy {};
{
return 1;
}
-#define vma_mpol_equal(a,b) 1
#define mpol_set_vma_default(vma) do {} while(0)
}
static inline void mpol_shared_policy_init(struct shared_policy *info,
- int policy, nodemask_t *nodes)
+ unsigned short policy, unsigned short flags, nodemask_t *nodes)
{
}
{
}
-#define set_cpuset_being_rebound(x) do {} while (0)
-
static inline struct zonelist *huge_zonelist(struct vm_area_struct *vma,
- unsigned long addr, gfp_t gfp_flags, struct mempolicy **mpol)
+ unsigned long addr, gfp_t gfp_flags,
+ struct mempolicy **mpol, nodemask_t **nodemask)
{
- return NODE_DATA(0)->node_zonelists + gfp_zone(gfp_flags);
+ *mpol = NULL;
+ *nodemask = NULL;
+ return node_zonelist(0, gfp_flags);
}
static inline int do_migrate_pages(struct mm_struct *mm,
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