diff options
Diffstat (limited to 'mm/hugetlb.c')
| -rw-r--r-- | mm/hugetlb.c | 68 |
1 files changed, 56 insertions, 12 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index da8fa4e4237c..549bf5ac3d6e 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -681,7 +681,7 @@ static int hstate_next_node_to_free(struct hstate *h, nodemask_t *nodes_allowed) #if defined(CONFIG_CMA) && defined(CONFIG_X86_64) static void destroy_compound_gigantic_page(struct page *page, - unsigned long order) + unsigned int order) { int i; int nr_pages = 1 << order; @@ -697,7 +697,7 @@ static void destroy_compound_gigantic_page(struct page *page, __ClearPageHead(page); } -static void free_gigantic_page(struct page *page, unsigned order) +static void free_gigantic_page(struct page *page, unsigned int order) { free_contig_range(page_to_pfn(page), 1 << order); } @@ -741,7 +741,7 @@ static bool zone_spans_last_pfn(const struct zone *zone, return zone_spans_pfn(zone, last_pfn); } -static struct page *alloc_gigantic_page(int nid, unsigned order) +static struct page *alloc_gigantic_page(int nid, unsigned int order) { unsigned long nr_pages = 1 << order; unsigned long ret, pfn, flags; @@ -777,7 +777,7 @@ static struct page *alloc_gigantic_page(int nid, unsigned order) } static void prep_new_huge_page(struct hstate *h, struct page *page, int nid); -static void prep_compound_gigantic_page(struct page *page, unsigned long order); +static void prep_compound_gigantic_page(struct page *page, unsigned int order); static struct page *alloc_fresh_gigantic_page_node(struct hstate *h, int nid) { @@ -810,9 +810,9 @@ static int alloc_fresh_gigantic_page(struct hstate *h, static inline bool gigantic_page_supported(void) { return true; } #else static inline bool gigantic_page_supported(void) { return false; } -static inline void free_gigantic_page(struct page *page, unsigned order) { } +static inline void free_gigantic_page(struct page *page, unsigned int order) { } static inline void destroy_compound_gigantic_page(struct page *page, - unsigned long order) { } + unsigned int order) { } static inline int alloc_fresh_gigantic_page(struct hstate *h, nodemask_t *nodes_allowed) { return 0; } #endif @@ -855,6 +855,31 @@ struct hstate *size_to_hstate(unsigned long size) return NULL; } +/* + * Test to determine whether the hugepage is "active/in-use" (i.e. being linked + * to hstate->hugepage_activelist.) + * + * This function can be called for tail pages, but never returns true for them. + */ +bool page_huge_active(struct page *page) +{ + VM_BUG_ON_PAGE(!PageHuge(page), page); + return PageHead(page) && PagePrivate(&page[1]); +} + +/* never called for tail page */ +static void set_page_huge_active(struct page *page) +{ + VM_BUG_ON_PAGE(!PageHeadHuge(page), page); + SetPagePrivate(&page[1]); +} + +static void clear_page_huge_active(struct page *page) +{ + VM_BUG_ON_PAGE(!PageHeadHuge(page), page); + ClearPagePrivate(&page[1]); +} + void free_huge_page(struct page *page) { /* @@ -875,6 +900,7 @@ void free_huge_page(struct page *page) ClearPagePrivate(page); spin_lock(&hugetlb_lock); + clear_page_huge_active(page); hugetlb_cgroup_uncharge_page(hstate_index(h), pages_per_huge_page(h), page); if (restore_reserve) @@ -906,7 +932,7 @@ static void prep_new_huge_page(struct hstate *h, struct page *page, int nid) put_page(page); /* free it into the hugepage allocator */ } -static void prep_compound_gigantic_page(struct page *page, unsigned long order) +static void prep_compound_gigantic_page(struct page *page, unsigned int order) { int i; int nr_pages = 1 << order; @@ -1464,7 +1490,8 @@ found: return 1; } -static void __init prep_compound_huge_page(struct page *page, int order) +static void __init prep_compound_huge_page(struct page *page, + unsigned int order) { if (unlikely(order > (MAX_ORDER - 1))) prep_compound_gigantic_page(page, order); @@ -2171,7 +2198,7 @@ static int __init hugetlb_init(void) module_init(hugetlb_init); /* Should be called on processing a hugepagesz=... option */ -void __init hugetlb_add_hstate(unsigned order) +void __init hugetlb_add_hstate(unsigned int order) { struct hstate *h; unsigned long i; @@ -2780,6 +2807,14 @@ static void unmap_ref_private(struct mm_struct *mm, struct vm_area_struct *vma, continue; /* + * Shared VMAs have their own reserves and do not affect + * MAP_PRIVATE accounting but it is possible that a shared + * VMA is using the same page so check and skip such VMAs. + */ + if (iter_vma->vm_flags & VM_MAYSHARE) + continue; + + /* * Unmap the page from other VMAs without their own reserves. * They get marked to be SIGKILLed if they fault in these * areas. This is because a future no-page fault on this VMA @@ -2884,6 +2919,7 @@ retry_avoidcopy: copy_user_huge_page(new_page, old_page, address, vma, pages_per_huge_page(h)); __SetPageUptodate(new_page); + set_page_huge_active(new_page); mmun_start = address & huge_page_mask(h); mmun_end = mmun_start + huge_page_size(h); @@ -2995,6 +3031,7 @@ retry: } clear_huge_page(page, address, pages_per_huge_page(h)); __SetPageUptodate(page); + set_page_huge_active(page); if (vma->vm_flags & VM_MAYSHARE) { int err; @@ -3799,19 +3836,26 @@ int dequeue_hwpoisoned_huge_page(struct page *hpage) bool isolate_huge_page(struct page *page, struct list_head *list) { + bool ret = true; + VM_BUG_ON_PAGE(!PageHead(page), page); - if (!get_page_unless_zero(page)) - return false; spin_lock(&hugetlb_lock); + if (!page_huge_active(page) || !get_page_unless_zero(page)) { + ret = false; + goto unlock; + } + clear_page_huge_active(page); list_move_tail(&page->lru, list); +unlock: spin_unlock(&hugetlb_lock); - return true; + return ret; } void putback_active_hugepage(struct page *page) { VM_BUG_ON_PAGE(!PageHead(page), page); spin_lock(&hugetlb_lock); + set_page_huge_active(page); list_move_tail(&page->lru, &(page_hstate(page))->hugepage_activelist); spin_unlock(&hugetlb_lock); put_page(page); |