On Wed, Sep 11, 2013 at 02:30:03PM +0000, Christoph Lameter wrote: > On Thu, 22 Aug 2013, Joonsoo Kim wrote: > > > And, therefore we should check pfmemalloc in page flag of first page, > > but current implementation don't do that. virt_to_head_page(obj) just > > return 'struct page' of that object, not one of first page, since the SLAB > > don't use __GFP_COMP when CONFIG_MMU. To get 'struct page' of first page, > > we first get a slab and try to get it via virt_to_head_page(slab->s_mem). > > Maybe using __GFP_COMP would make it consistent across all allocators and > avoid the issue? We then do only have to set the flags on the first page. Yes, you are right. It can be solved by using __GFP_COMP. But I made this patch to clarify the problem in current code and to be merged seperately. If I solve the problem with __GFP_COMP which is implemented in [09/16] of this patchset, it would also weaken the purpose of that patch. Thanks. -- 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>