* 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)
+#define MPOL_F_RELATIVE_NODES (1 << 14)
-/* Flags for get_mem_policy */
+/*
+ * 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 */
#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 */
+
#ifdef __KERNEL__
#include <linux/mmzone.h>
#include <linux/spinlock.h>
#include <linux/nodemask.h>
-struct vm_area_struct;
struct mm_struct;
#ifdef CONFIG_NUMA
* 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_put() decrements the reference count to zero.
*
- * Copying policy objects:
- * For MPOL_BIND the zonelist must be always duplicated. mpol_clone() does this.
+ * 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;
- short policy; /* See MPOL_* above */
+ unsigned short mode; /* 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;
};
/*
* 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)
+extern void __mpol_put(struct mempolicy *pol);
+static inline void mpol_put(struct mempolicy *pol)
{
if (pol)
- __mpol_free(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_copy(struct mempolicy *pol);
-static inline struct mempolicy *mpol_copy(struct mempolicy *pol)
+extern struct mempolicy *__mpol_dup(struct mempolicy *pol);
+static inline struct mempolicy *mpol_dup(struct mempolicy *pol)
{
if (pol)
- pol = __mpol_copy(pol);
+ pol = __mpol_dup(pol);
return pol;
}
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.
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 mode,
+ 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_put(struct mempolicy *p)
+{
+}
+
+static inline void mpol_cond_put(struct mempolicy *pol)
+{
+}
-static inline void mpol_free(struct mempolicy *p)
+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_copy(struct mempolicy *old)
+static inline struct mempolicy *mpol_dup(struct mempolicy *old)
{
return NULL;
}
}
static inline void mpol_shared_policy_init(struct shared_policy *info,
- int policy, nodemask_t *nodes)
+ unsigned short mode, 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,
git.openpandora.org / pandora-kernel.git / blobdiff