313 lines
7.4 KiB
C
313 lines
7.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* NUMA memory policies for Linux.
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* Copyright 2003,2004 Andi Kleen SuSE Labs
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*/
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#ifndef _LINUX_MEMPOLICY_H
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#define _LINUX_MEMPOLICY_H 1
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#include <linux/mmzone.h>
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#include <linux/dax.h>
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#include <linux/slab.h>
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#include <linux/rbtree.h>
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#include <linux/spinlock.h>
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#include <linux/nodemask.h>
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#include <linux/pagemap.h>
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#include <uapi/linux/mempolicy.h>
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struct mm_struct;
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#ifdef CONFIG_NUMA
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/*
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* Describe a memory policy.
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*
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* A mempolicy can be either associated with a process or with a VMA.
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* For VMA related allocations the VMA policy is preferred, otherwise
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* the process policy is used. Interrupts ignore the memory policy
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* of the current process.
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*
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* Locking policy for interlave:
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* In process context there is no locking because only the process accesses
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* its own state. All vma manipulation is somewhat protected by a down_read on
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* mmap_sem.
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*
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* Freeing policy:
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* Mempolicy objects are reference counted. A mempolicy will be freed when
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* mpol_put() decrements the reference count to zero.
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*
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* Duplicating policy objects:
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* mpol_dup() allocates a new mempolicy and copies the specified mempolicy
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* to the new storage. The reference count of the new object is initialized
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* to 1, representing the caller of mpol_dup().
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*/
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struct mempolicy {
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atomic_t refcnt;
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unsigned short mode; /* See MPOL_* above */
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unsigned short flags; /* See set_mempolicy() MPOL_F_* above */
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union {
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short preferred_node; /* preferred */
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nodemask_t nodes; /* interleave/bind */
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/* undefined for default */
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} v;
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union {
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nodemask_t cpuset_mems_allowed; /* relative to these nodes */
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nodemask_t user_nodemask; /* nodemask passed by user */
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} w;
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};
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/*
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* Support for managing mempolicy data objects (clone, copy, destroy)
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* The default fast path of a NULL MPOL_DEFAULT policy is always inlined.
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*/
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extern void __mpol_put(struct mempolicy *pol);
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static inline void mpol_put(struct mempolicy *pol)
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{
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if (pol)
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__mpol_put(pol);
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}
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/*
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* Does mempolicy pol need explicit unref after use?
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* Currently only needed for shared policies.
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*/
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static inline int mpol_needs_cond_ref(struct mempolicy *pol)
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{
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return (pol && (pol->flags & MPOL_F_SHARED));
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}
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static inline void mpol_cond_put(struct mempolicy *pol)
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{
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if (mpol_needs_cond_ref(pol))
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__mpol_put(pol);
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}
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extern struct mempolicy *__mpol_dup(struct mempolicy *pol);
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static inline struct mempolicy *mpol_dup(struct mempolicy *pol)
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{
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if (pol)
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pol = __mpol_dup(pol);
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return pol;
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}
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#define vma_policy(vma) ((vma)->vm_policy)
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static inline void mpol_get(struct mempolicy *pol)
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{
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if (pol)
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atomic_inc(&pol->refcnt);
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}
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extern bool __mpol_equal(struct mempolicy *a, struct mempolicy *b);
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static inline bool mpol_equal(struct mempolicy *a, struct mempolicy *b)
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{
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if (a == b)
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return true;
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return __mpol_equal(a, b);
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}
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/*
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* Tree of shared policies for a shared memory region.
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* Maintain the policies in a pseudo mm that contains vmas. The vmas
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* carry the policy. As a special twist the pseudo mm is indexed in pages, not
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* bytes, so that we can work with shared memory segments bigger than
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* unsigned long.
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*/
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struct sp_node {
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struct rb_node nd;
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unsigned long start, end;
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struct mempolicy *policy;
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};
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struct shared_policy {
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struct rb_root root;
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rwlock_t lock;
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};
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int vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst);
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void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol);
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int mpol_set_shared_policy(struct shared_policy *info,
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struct vm_area_struct *vma,
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struct mempolicy *new);
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void mpol_free_shared_policy(struct shared_policy *p);
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struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp,
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unsigned long idx);
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struct mempolicy *get_task_policy(struct task_struct *p);
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struct mempolicy *__get_vma_policy(struct vm_area_struct *vma,
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unsigned long addr);
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bool vma_policy_mof(struct vm_area_struct *vma);
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extern void numa_default_policy(void);
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extern void numa_policy_init(void);
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extern void mpol_rebind_task(struct task_struct *tsk, const nodemask_t *new);
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extern void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new);
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extern int huge_node(struct vm_area_struct *vma,
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unsigned long addr, gfp_t gfp_flags,
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struct mempolicy **mpol, nodemask_t **nodemask);
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extern bool init_nodemask_of_mempolicy(nodemask_t *mask);
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extern bool mempolicy_nodemask_intersects(struct task_struct *tsk,
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const nodemask_t *mask);
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extern unsigned int mempolicy_slab_node(void);
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extern enum zone_type policy_zone;
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static inline void check_highest_zone(enum zone_type k)
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{
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if (k > policy_zone && k != ZONE_MOVABLE)
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policy_zone = k;
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}
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int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from,
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const nodemask_t *to, int flags);
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#ifdef CONFIG_TMPFS
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extern int mpol_parse_str(char *str, struct mempolicy **mpol);
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#endif
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extern void mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol);
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/* Check if a vma is migratable */
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static inline bool vma_migratable(struct vm_area_struct *vma)
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{
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if (vma->vm_flags & (VM_IO | VM_PFNMAP))
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return false;
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/*
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* DAX device mappings require predictable access latency, so avoid
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* incurring periodic faults.
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*/
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if (vma_is_dax(vma))
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return false;
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#ifndef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
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if (vma->vm_flags & VM_HUGETLB)
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return false;
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#endif
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/*
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* Migration allocates pages in the highest zone. If we cannot
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* do so then migration (at least from node to node) is not
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* possible.
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*/
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if (vma->vm_file &&
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gfp_zone(mapping_gfp_mask(vma->vm_file->f_mapping))
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< policy_zone)
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return false;
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return true;
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}
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extern int mpol_misplaced(struct page *, struct vm_area_struct *, unsigned long);
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extern void mpol_put_task_policy(struct task_struct *);
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#else
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struct mempolicy {};
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static inline bool mpol_equal(struct mempolicy *a, struct mempolicy *b)
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{
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return true;
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}
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static inline void mpol_put(struct mempolicy *p)
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{
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}
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static inline void mpol_cond_put(struct mempolicy *pol)
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{
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}
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static inline void mpol_get(struct mempolicy *pol)
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{
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}
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struct shared_policy {};
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static inline void mpol_shared_policy_init(struct shared_policy *sp,
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struct mempolicy *mpol)
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{
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}
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static inline void mpol_free_shared_policy(struct shared_policy *p)
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{
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}
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static inline struct mempolicy *
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mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx)
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{
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return NULL;
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}
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#define vma_policy(vma) NULL
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static inline int
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vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst)
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{
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return 0;
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}
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static inline void numa_policy_init(void)
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{
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}
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static inline void numa_default_policy(void)
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{
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}
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static inline void mpol_rebind_task(struct task_struct *tsk,
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const nodemask_t *new)
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{
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}
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static inline void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new)
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{
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}
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static inline int huge_node(struct vm_area_struct *vma,
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unsigned long addr, gfp_t gfp_flags,
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struct mempolicy **mpol, nodemask_t **nodemask)
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{
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*mpol = NULL;
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*nodemask = NULL;
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return 0;
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}
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static inline bool init_nodemask_of_mempolicy(nodemask_t *m)
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{
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return false;
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}
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static inline int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from,
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const nodemask_t *to, int flags)
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{
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return 0;
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}
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static inline void check_highest_zone(int k)
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{
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}
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#ifdef CONFIG_TMPFS
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static inline int mpol_parse_str(char *str, struct mempolicy **mpol)
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{
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return 1; /* error */
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}
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#endif
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static inline int mpol_misplaced(struct page *page, struct vm_area_struct *vma,
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unsigned long address)
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{
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return -1; /* no node preference */
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}
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static inline void mpol_put_task_policy(struct task_struct *task)
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{
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}
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#endif /* CONFIG_NUMA */
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#endif
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