diff options
Diffstat (limited to 'include/linux/mempolicy.h')
| -rw-r--r-- | include/linux/mempolicy.h | 156 |
1 files changed, 118 insertions, 38 deletions
diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h index 59c4865bc85..3a39570b81b 100644 --- a/include/linux/mempolicy.h +++ b/include/linux/mempolicy.h @@ -8,15 +8,32 @@ * 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 */ @@ -27,6 +44,14 @@ #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> @@ -35,7 +60,6 @@ #include <linux/spinlock.h> #include <linux/nodemask.h> -struct vm_area_struct; struct mm_struct; #ifdef CONFIG_NUMA @@ -54,22 +78,27 @@ struct mm_struct; * 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; }; /* @@ -77,18 +106,43 @@ struct mempolicy { * 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); } -extern struct mempolicy *__mpol_copy(struct mempolicy *pol); -static inline struct mempolicy *mpol_copy(struct mempolicy *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_copy(pol); + pol = __mpol_dup(pol); return pol; } @@ -108,11 +162,6 @@ static inline int mpol_equal(struct mempolicy *a, struct mempolicy *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) /* * Tree of shared policies for a shared memory region. @@ -133,8 +182,7 @@ struct shared_policy { 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 *sp, struct mempolicy *mpol); int mpol_set_shared_policy(struct shared_policy *info, struct vm_area_struct *vma, struct mempolicy *new); @@ -149,9 +197,9 @@ extern void mpol_rebind_task(struct task_struct *tsk, 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 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; @@ -165,6 +213,13 @@ static inline void check_highest_zone(enum zone_type 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); + +extern int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol, + int no_context); +#endif #else struct mempolicy {}; @@ -173,19 +228,26 @@ 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_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; } @@ -199,8 +261,8 @@ static inline int mpol_set_shared_policy(struct shared_policy *info, return -EINVAL; } -static inline void mpol_shared_policy_init(struct shared_policy *info, - int policy, nodemask_t *nodes) +static inline void mpol_shared_policy_init(struct shared_policy *sp, + struct mempolicy *mpol) { } @@ -239,9 +301,12 @@ 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) + 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, @@ -254,6 +319,21 @@ static inline int do_migrate_pages(struct mm_struct *mm, 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 */ +} + +static inline int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol, + int no_context) +{ + return 0; +} +#endif + #endif /* CONFIG_NUMA */ #endif /* __KERNEL__ */ |