On Mon, 12 Sep 2011 12:57:23 +0200 Johannes Weiner <jweiner@xxxxxxxxxx> wrote: > root_mem_cgroup, lacking a configurable limit, was never subject to > limit reclaim, so the pages charged to it could be kept off its LRU > lists. They would be found on the global per-zone LRU lists upon > physical memory pressure and it made sense to avoid uselessly linking > them to both lists. > > The global per-zone LRU lists are about to go away on memcg-enabled > kernels, with all pages being exclusively linked to their respective > per-memcg LRU lists. As a result, pages of the root_mem_cgroup must > also be linked to its LRU lists again. > > The overhead is temporary until the double-LRU scheme is going away > completely. > > Signed-off-by: Johannes Weiner <jweiner@xxxxxxxxxx> Reviewed-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>