diff options
Diffstat (limited to 'include/linux/rmap.h')
| -rw-r--r-- | include/linux/rmap.h | 67 |
1 files changed, 41 insertions, 26 deletions
diff --git a/include/linux/rmap.h b/include/linux/rmap.h index 3fce545df394..c20635c527a9 100644 --- a/include/linux/rmap.h +++ b/include/linux/rmap.h @@ -7,7 +7,7 @@ #include <linux/list.h> #include <linux/slab.h> #include <linux/mm.h> -#include <linux/mutex.h> +#include <linux/rwsem.h> #include <linux/memcontrol.h> /* @@ -25,8 +25,8 @@ * pointing to this anon_vma once its vma list is empty. */ struct anon_vma { - struct anon_vma *root; /* Root of this anon_vma tree */ - struct mutex mutex; /* Serialize access to vma list */ + struct anon_vma *root; /* Root of this anon_vma tree */ + struct rw_semaphore rwsem; /* W: modification, R: walking the list */ /* * The refcount is taken on an anon_vma when there is no * guarantee that the vma of page tables will exist for @@ -37,14 +37,14 @@ struct anon_vma { atomic_t refcount; /* - * NOTE: the LSB of the head.next is set by + * NOTE: the LSB of the rb_root.rb_node is set by * mm_take_all_locks() _after_ taking the above lock. So the - * head must only be read/written after taking the above lock + * rb_root must only be read/written after taking the above lock * to be sure to see a valid next pointer. The LSB bit itself * is serialized by a system wide lock only visible to * mm_take_all_locks() (mm_all_locks_mutex). */ - struct list_head head; /* Chain of private "related" vmas */ + struct rb_root rb_root; /* Interval tree of private "related" vmas */ }; /* @@ -57,14 +57,29 @@ struct anon_vma { * with a VMA, or the VMAs associated with an anon_vma. * The "same_vma" list contains the anon_vma_chains linking * all the anon_vmas associated with this VMA. - * The "same_anon_vma" list contains the anon_vma_chains + * The "rb" field indexes on an interval tree the anon_vma_chains * which link all the VMAs associated with this anon_vma. */ struct anon_vma_chain { struct vm_area_struct *vma; struct anon_vma *anon_vma; struct list_head same_vma; /* locked by mmap_sem & page_table_lock */ - struct list_head same_anon_vma; /* locked by anon_vma->mutex */ + struct rb_node rb; /* locked by anon_vma->rwsem */ + unsigned long rb_subtree_last; +#ifdef CONFIG_DEBUG_VM_RB + unsigned long cached_vma_start, cached_vma_last; +#endif +}; + +enum ttu_flags { + TTU_UNMAP = 0, /* unmap mode */ + TTU_MIGRATION = 1, /* migration mode */ + TTU_MUNLOCK = 2, /* munlock mode */ + TTU_ACTION_MASK = 0xff, + + TTU_IGNORE_MLOCK = (1 << 8), /* ignore mlock */ + TTU_IGNORE_ACCESS = (1 << 9), /* don't age */ + TTU_IGNORE_HWPOISON = (1 << 10),/* corrupted page is recoverable */ }; #ifdef CONFIG_MMU @@ -93,26 +108,37 @@ static inline void vma_lock_anon_vma(struct vm_area_struct *vma) { struct anon_vma *anon_vma = vma->anon_vma; if (anon_vma) - mutex_lock(&anon_vma->root->mutex); + down_write(&anon_vma->root->rwsem); } static inline void vma_unlock_anon_vma(struct vm_area_struct *vma) { struct anon_vma *anon_vma = vma->anon_vma; if (anon_vma) - mutex_unlock(&anon_vma->root->mutex); + up_write(&anon_vma->root->rwsem); } -static inline void anon_vma_lock(struct anon_vma *anon_vma) +static inline void anon_vma_lock_write(struct anon_vma *anon_vma) { - mutex_lock(&anon_vma->root->mutex); + down_write(&anon_vma->root->rwsem); } static inline void anon_vma_unlock(struct anon_vma *anon_vma) { - mutex_unlock(&anon_vma->root->mutex); + up_write(&anon_vma->root->rwsem); +} + +static inline void anon_vma_lock_read(struct anon_vma *anon_vma) +{ + down_read(&anon_vma->root->rwsem); } +static inline void anon_vma_unlock_read(struct anon_vma *anon_vma) +{ + up_read(&anon_vma->root->rwsem); +} + + /* * anon_vma helper functions. */ @@ -120,7 +146,6 @@ void anon_vma_init(void); /* create anon_vma_cachep */ int anon_vma_prepare(struct vm_area_struct *); void unlink_anon_vmas(struct vm_area_struct *); int anon_vma_clone(struct vm_area_struct *, struct vm_area_struct *); -void anon_vma_moveto_tail(struct vm_area_struct *); int anon_vma_fork(struct vm_area_struct *, struct vm_area_struct *); static inline void anon_vma_merge(struct vm_area_struct *vma, @@ -161,16 +186,6 @@ int page_referenced(struct page *, int is_locked, int page_referenced_one(struct page *, struct vm_area_struct *, unsigned long address, unsigned int *mapcount, unsigned long *vm_flags); -enum ttu_flags { - TTU_UNMAP = 0, /* unmap mode */ - TTU_MIGRATION = 1, /* migration mode */ - TTU_MUNLOCK = 2, /* munlock mode */ - TTU_ACTION_MASK = 0xff, - - TTU_IGNORE_MLOCK = (1 << 8), /* ignore mlock */ - TTU_IGNORE_ACCESS = (1 << 9), /* don't age */ - TTU_IGNORE_HWPOISON = (1 << 10),/* corrupted page is recoverable */ -}; #define TTU_ACTION(x) ((x) & TTU_ACTION_MASK) int try_to_unmap(struct page *, enum ttu_flags flags); @@ -216,8 +231,8 @@ int try_to_munlock(struct page *); /* * Called by memory-failure.c to kill processes. */ -struct anon_vma *page_lock_anon_vma(struct page *page); -void page_unlock_anon_vma(struct anon_vma *anon_vma); +struct anon_vma *page_lock_anon_vma_read(struct page *page); +void page_unlock_anon_vma_read(struct anon_vma *anon_vma); int page_mapped_in_vma(struct page *page, struct vm_area_struct *vma); /* |