diff options
Diffstat (limited to 'mm/rmap.c')
| -rw-r--r-- | mm/rmap.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/mm/rmap.c b/mm/rmap.c index 38a336e2eea..0ad53572eaf 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -56,6 +56,7 @@ #include <linux/memcontrol.h> #include <linux/mmu_notifier.h> #include <linux/migrate.h> +#include <linux/hugetlb.h> #include <asm/tlbflush.h> @@ -326,6 +327,8 @@ vma_address(struct page *page, struct vm_area_struct *vma) pgoff_t pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT); unsigned long address; + if (unlikely(is_vm_hugetlb_page(vma))) + pgoff = page->index << huge_page_order(page_hstate(page)); address = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT); if (unlikely(address < vma->vm_start || address >= vma->vm_end)) { /* page should be within @vma mapping range */ @@ -369,6 +372,12 @@ pte_t *page_check_address(struct page *page, struct mm_struct *mm, pte_t *pte; spinlock_t *ptl; + if (unlikely(PageHuge(page))) { + pte = huge_pte_offset(mm, address); + ptl = &mm->page_table_lock; + goto check; + } + pgd = pgd_offset(mm, address); if (!pgd_present(*pgd)) return NULL; @@ -389,6 +398,7 @@ pte_t *page_check_address(struct page *page, struct mm_struct *mm, } ptl = pte_lockptr(mm, pmd); +check: spin_lock(ptl); if (pte_present(*pte) && page_to_pfn(page) == pte_pfn(*pte)) { *ptlp = ptl; @@ -873,6 +883,12 @@ void page_remove_rmap(struct page *page) page_clear_dirty(page); set_page_dirty(page); } + /* + * Hugepages are not counted in NR_ANON_PAGES nor NR_FILE_MAPPED + * and not charged by memcg for now. + */ + if (unlikely(PageHuge(page))) + return; if (PageAnon(page)) { mem_cgroup_uncharge_page(page); __dec_zone_page_state(page, NR_ANON_PAGES); @@ -1445,3 +1461,46 @@ int rmap_walk(struct page *page, int (*rmap_one)(struct page *, return rmap_walk_file(page, rmap_one, arg); } #endif /* CONFIG_MIGRATION */ + +#ifdef CONFIG_HUGETLBFS +/* + * The following three functions are for anonymous (private mapped) hugepages. + * Unlike common anonymous pages, anonymous hugepages have no accounting code + * and no lru code, because we handle hugepages differently from common pages. + */ +static void __hugepage_set_anon_rmap(struct page *page, + struct vm_area_struct *vma, unsigned long address, int exclusive) +{ + struct anon_vma *anon_vma = vma->anon_vma; + BUG_ON(!anon_vma); + if (!exclusive) { + struct anon_vma_chain *avc; + avc = list_entry(vma->anon_vma_chain.prev, + struct anon_vma_chain, same_vma); + anon_vma = avc->anon_vma; + } + anon_vma = (void *) anon_vma + PAGE_MAPPING_ANON; + page->mapping = (struct address_space *) anon_vma; + page->index = linear_page_index(vma, address); +} + +void hugepage_add_anon_rmap(struct page *page, + struct vm_area_struct *vma, unsigned long address) +{ + struct anon_vma *anon_vma = vma->anon_vma; + int first; + BUG_ON(!anon_vma); + BUG_ON(address < vma->vm_start || address >= vma->vm_end); + first = atomic_inc_and_test(&page->_mapcount); + if (first) + __hugepage_set_anon_rmap(page, vma, address, 0); +} + +void hugepage_add_new_anon_rmap(struct page *page, + struct vm_area_struct *vma, unsigned long address) +{ + BUG_ON(address < vma->vm_start || address >= vma->vm_end); + atomic_set(&page->_mapcount, 0); + __hugepage_set_anon_rmap(page, vma, address, 1); +} +#endif /* CONFIG_HUGETLBFS */ |