On Fri, Mar 14, 2014 at 03:37:47PM +0900, Minchan Kim wrote: > diff --git a/include/linux/mm.h b/include/linux/mm.h > index c1b7414c7bef..9b048cabce27 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -933,10 +933,16 @@ void page_address_init(void); > * Please note that, confusingly, "page_mapping" refers to the inode > * address_space which maps the page from disk; whereas "page_mapped" > * refers to user virtual address space into which the page is mapped. > + * > + * PAGE_MAPPING_LZFREE bit is set along with PAGE_MAPPING_ANON bit > + * and then page->mapping points to an anon_vma. This flag is used > + * for lazy freeing the page instead of swap. > */ > #define PAGE_MAPPING_ANON 1 > #define PAGE_MAPPING_KSM 2 > -#define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM) > +#define PAGE_MAPPING_LZFREE 4 > +#define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM | \ > + PAGE_MAPPING_LZFREE) Is it safe to use third bit in pointer everywhere? -- Kirill A. Shutemov -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>