diff options
Diffstat (limited to 'include/linux/mm.h')
| -rw-r--r-- | include/linux/mm.h | 70 |
1 files changed, 61 insertions, 9 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 35527173cf50..a512dd836931 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -57,6 +57,15 @@ extern int sysctl_legacy_va_layout; extern unsigned long sysctl_user_reserve_kbytes; extern unsigned long sysctl_admin_reserve_kbytes; +extern int sysctl_overcommit_memory; +extern int sysctl_overcommit_ratio; +extern unsigned long sysctl_overcommit_kbytes; + +extern int overcommit_ratio_handler(struct ctl_table *, int, void __user *, + size_t *, loff_t *); +extern int overcommit_kbytes_handler(struct ctl_table *, int, void __user *, + size_t *, loff_t *); + #define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) /* to align the pointer to the (next) page boundary */ @@ -414,15 +423,44 @@ static inline int page_count(struct page *page) return atomic_read(&compound_head(page)->_count); } +#ifdef CONFIG_HUGETLB_PAGE +extern int PageHeadHuge(struct page *page_head); +#else /* CONFIG_HUGETLB_PAGE */ +static inline int PageHeadHuge(struct page *page_head) +{ + return 0; +} +#endif /* CONFIG_HUGETLB_PAGE */ + +static inline bool __compound_tail_refcounted(struct page *page) +{ + return !PageSlab(page) && !PageHeadHuge(page); +} + +/* + * This takes a head page as parameter and tells if the + * tail page reference counting can be skipped. + * + * For this to be safe, PageSlab and PageHeadHuge must remain true on + * any given page where they return true here, until all tail pins + * have been released. + */ +static inline bool compound_tail_refcounted(struct page *page) +{ + VM_BUG_ON(!PageHead(page)); + return __compound_tail_refcounted(page); +} + static inline void get_huge_page_tail(struct page *page) { /* - * __split_huge_page_refcount() cannot run - * from under us. + * __split_huge_page_refcount() cannot run from under us. */ + VM_BUG_ON(!PageTail(page)); VM_BUG_ON(page_mapcount(page) < 0); VM_BUG_ON(atomic_read(&page->_count) != 0); - atomic_inc(&page->_mapcount); + if (compound_tail_refcounted(page->first_page)) + atomic_inc(&page->_mapcount); } extern bool __get_page_tail(struct page *page); @@ -846,11 +884,14 @@ static __always_inline void *lowmem_page_address(const struct page *page) #endif #if defined(WANT_PAGE_VIRTUAL) -#define page_address(page) ((page)->virtual) -#define set_page_address(page, address) \ - do { \ - (page)->virtual = (address); \ - } while(0) +static inline void *page_address(const struct page *page) +{ + return page->virtual; +} +static inline void set_page_address(struct page *page, void *address) +{ + page->virtual = address; +} #define page_address_init() do { } while(0) #endif @@ -984,7 +1025,6 @@ extern void pagefault_out_of_memory(void); * various contexts. */ #define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */ -#define SHOW_MEM_FILTER_PAGE_COUNT (0x0002u) /* page type count */ extern void show_free_areas(unsigned int flags); extern bool skip_free_areas_node(unsigned int flags, int nid); @@ -1318,6 +1358,7 @@ static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long a #if USE_SPLIT_PTE_PTLOCKS #if ALLOC_SPLIT_PTLOCKS +void __init ptlock_cache_init(void); extern bool ptlock_alloc(struct page *page); extern void ptlock_free(struct page *page); @@ -1326,6 +1367,10 @@ static inline spinlock_t *ptlock_ptr(struct page *page) return page->ptl; } #else /* ALLOC_SPLIT_PTLOCKS */ +static inline void ptlock_cache_init(void) +{ +} + static inline bool ptlock_alloc(struct page *page) { return true; @@ -1378,10 +1423,17 @@ static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pmd_t *pmd) { return &mm->page_table_lock; } +static inline void ptlock_cache_init(void) {} static inline bool ptlock_init(struct page *page) { return true; } static inline void pte_lock_deinit(struct page *page) {} #endif /* USE_SPLIT_PTE_PTLOCKS */ +static inline void pgtable_init(void) +{ + ptlock_cache_init(); + pgtable_cache_init(); +} + static inline bool pgtable_page_ctor(struct page *page) { inc_zone_page_state(page, NR_PAGETABLE); |