This is just an RFC...test is not enough yet. I know it's merge window..this post is just for sharing idea. This patch merges pc->flags and pc->mem_cgroup into a word. Then, memcg's overhead will be 8bytes per page(4096bytes?). Because this patch will affect all memory cgroup developers, I'd like to show patches before MM Summit. I think we can agree the direction to reduce size of page_cgroup..and finally integrate into 'struct page' (and remove cgroup_disable= boot option...) Patch 1/3 - introduce pc_to_mem_cgroup and hide pc->mem_cgroup Patch 2/3 - remove pc->mem_cgroup Patch 3/3 - remove memory barriers. I'm now wondering when this change should be merged.... Thanks, -Kame -- 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>