On Tue, 4 Feb 2014, Joonsoo Kim wrote: > I think that you need more code to skip this type of page correctly. > Without page_mapped() check, this code makes migratable pages be skipped, > since if page_mapped() case, page_count() may be more than zero. > > So I think that you need following change. > > (!page_mapping(page) && !page_mapped(page) && page_count(page)) >
These pages returned by get_user_pages() will have a mapcount of 1 so this wouldn't actually fix the massive lock contention. page_mapping() is only going to be NULL for pages off the lru like these are for PAGE_MAPPING_ANON. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
