On Wed, Jun 16, 2010 at 09:17:55AM +0900, KAMEZAWA Hiroyuki wrote: > yes. It's only called from > - page fault > - add_to_page_cache() > > I think we'll see no stack problem. Now, memcg doesn't wakeup kswapd for > reclaiming memory, it needs direct writeback. The page fault code should be fine, but add_to_page_cache can be called with quite deep stacks. Two examples are grab_cache_page_write_begin which already was part of one of the stack overflows mentioned in this thread, or find_or_create_page which can be called via _xfs_buf_lookup_pages, which can be called from under the whole XFS allocator, or via grow_dev_page which might have a similarly deep stack for users of the normal buffer cache. Although for the find_or_create_page we usually should not have __GFP_FS set in the gfp_mask. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>