X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=mm%2Frmap.c;h=16521664010ddc06b5dfb25303413bedb6a58041;hb=a56ed663047fc9927ec8b35750d23ece54f85dc7;hp=10993942d6c989314477291520c6bb6980a0439d;hpb=fdd2e5f88a259a537bb239e0c03c973cb6ea402a;p=safe%2Fjmp%2Flinux-2.6 diff --git a/mm/rmap.c b/mm/rmap.c index 1099394..1652166 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -47,9 +47,9 @@ #include #include #include -#include #include #include +#include #include @@ -191,7 +191,7 @@ void __init anon_vma_init(void) * Getting a lock on a stable anon_vma from a page off the LRU is * tricky: page_lock_anon_vma rely on RCU to guard against the races. */ -struct anon_vma *page_lock_anon_vma(struct page *page) +static struct anon_vma *page_lock_anon_vma(struct page *page) { struct anon_vma *anon_vma; unsigned long anon_mapping; @@ -211,7 +211,7 @@ out: return NULL; } -void page_unlock_anon_vma(struct anon_vma *anon_vma) +static void page_unlock_anon_vma(struct anon_vma *anon_vma) { spin_unlock(&anon_vma->lock); rcu_read_unlock(); @@ -359,8 +359,17 @@ static int page_referenced_one(struct page *page, goto out_unmap; } - if (ptep_clear_flush_young_notify(vma, address, pte)) - referenced++; + if (ptep_clear_flush_young_notify(vma, address, pte)) { + /* + * Don't treat a reference through a sequentially read + * mapping as such. If the page has been used in + * another mapping, we will catch it; if this other + * mapping is already gone, the unmap path will have + * set PG_referenced or activated the page. + */ + if (likely(!VM_SequentialReadHint(vma))) + referenced++; + } /* Pretend the page is referenced if the task has the swap token and is in the middle of a page fault. */ @@ -661,9 +670,14 @@ void page_add_anon_rmap(struct page *page, void page_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); /* elevate count by 1 (starts at -1) */ + VM_BUG_ON(address < vma->vm_start || address >= vma->vm_end); + SetPageSwapBacked(page); + atomic_set(&page->_mapcount, 0); /* increment count (starts at -1) */ __page_set_anon_rmap(page, vma, address); + if (page_evictable(page, vma)) + lru_cache_add_lru(page, LRU_ACTIVE_ANON); + else + add_page_to_unevictable_list(page); } /** @@ -693,7 +707,6 @@ void page_add_file_rmap(struct page *page) */ void page_dup_rmap(struct page *page, struct vm_area_struct *vma, unsigned long address) { - BUG_ON(page_mapcount(page) == 0); if (PageAnon(page)) __page_check_anon_rmap(page, vma, address); atomic_inc(&page->_mapcount); @@ -703,28 +716,12 @@ void page_dup_rmap(struct page *page, struct vm_area_struct *vma, unsigned long /** * page_remove_rmap - take down pte mapping from a page * @page: page to remove mapping from - * @vma: the vm area in which the mapping is removed * * The caller needs to hold the pte lock. */ -void page_remove_rmap(struct page *page, struct vm_area_struct *vma) +void page_remove_rmap(struct page *page) { if (atomic_add_negative(-1, &page->_mapcount)) { - if (unlikely(page_mapcount(page) < 0)) { - printk (KERN_EMERG "Eeek! page_mapcount(page) went negative! (%d)\n", page_mapcount(page)); - printk (KERN_EMERG " page pfn = %lx\n", page_to_pfn(page)); - printk (KERN_EMERG " page->flags = %lx\n", page->flags); - printk (KERN_EMERG " page->count = %x\n", page_count(page)); - printk (KERN_EMERG " page->mapping = %p\n", page->mapping); - print_symbol (KERN_EMERG " vma->vm_ops = %s\n", (unsigned long)vma->vm_ops); - if (vma->vm_ops) { - print_symbol (KERN_EMERG " vma->vm_ops->fault = %s\n", (unsigned long)vma->vm_ops->fault); - } - if (vma->vm_file && vma->vm_file->f_op) - print_symbol (KERN_EMERG " vma->vm_file->f_op->mmap = %s\n", (unsigned long)vma->vm_file->f_op->mmap); - BUG(); - } - /* * Now that the last pte has gone, s390 must transfer dirty * flag from storage key to struct page. We can usually skip @@ -818,8 +815,7 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma, spin_unlock(&mmlist_lock); } dec_mm_counter(mm, anon_rss); -#ifdef CONFIG_MIGRATION - } else { + } else if (PAGE_MIGRATION) { /* * Store the pfn of the page in a special migration * pte. do_swap_page() will wait until the migration @@ -827,23 +823,19 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma, */ BUG_ON(!migration); entry = make_migration_entry(page, pte_write(pteval)); -#endif } set_pte_at(mm, address, pte, swp_entry_to_pte(entry)); BUG_ON(pte_file(*pte)); - } else -#ifdef CONFIG_MIGRATION - if (migration) { + } else if (PAGE_MIGRATION && migration) { /* Establish migration entry for a file page */ swp_entry_t entry; entry = make_migration_entry(page, pte_write(pteval)); set_pte_at(mm, address, pte, swp_entry_to_pte(entry)); } else -#endif dec_mm_counter(mm, file_rss); - page_remove_rmap(page, vma); + page_remove_rmap(page); page_cache_release(page); out_unmap: @@ -958,7 +950,7 @@ static int try_to_unmap_cluster(unsigned long cursor, unsigned int *mapcount, if (pte_dirty(pteval)) set_page_dirty(page); - page_remove_rmap(page, vma); + page_remove_rmap(page); page_cache_release(page); dec_mm_counter(mm, file_rss); (*mapcount)--; @@ -1080,7 +1072,8 @@ static int try_to_unmap_file(struct page *page, int unlock, int migration) spin_lock(&mapping->i_mmap_lock); vma_prio_tree_foreach(vma, &iter, &mapping->i_mmap, pgoff, pgoff) { if (MLOCK_PAGES && unlikely(unlock)) { - if (!(vma->vm_flags & VM_LOCKED)) + if (!((vma->vm_flags & VM_LOCKED) && + page_mapped_in_vma(page, vma))) continue; /* must visit all vmas */ ret = SWAP_MLOCK; } else {