On Tue, 29 Nov 2011 11:52:03 +0100 Johannes Weiner <hannes@xxxxxxxxxxx> wrote: > lookup_page_cgroup() is usually used only against pages that are used > in userspace. > > The exception is the CONFIG_DEBUG_VM-only memcg check from the page > allocator: it can run on pages without page_cgroup descriptors > allocated when the pages are fed into the page allocator for the first > time during boot or memory hotplug. > > Include the array check only when CONFIG_DEBUG_VM is set and save the > unnecessary check in production kernels. > > Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> -- 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>