On 05/29/2012 09:16 AM, Peter Zijlstra wrote:
On Fri, 2012-05-25 at 19:02 +0200, Andrea Arcangeli wrote:
24 bytes per page.. or ~0.6% of memory gone. This is far too great a price to pay. At LSF/MM Rik already suggested you limit the number of pages that can be migrated concurrently and use this to move the extra list_head out of struct page and into a smaller amount of extra structures, reducing the total overhead.
For THP, we should be able to track this NUMA info on a 2MB page granularity. It is not like we will ever want to break up a large page into small pages anyway (with different 4kB pages going to different NUMA nodes), because the THP benefit is on the same order of magnitude as the NUMA benefit. -- All rights reversed -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>