From: Johannes Weiner Date: Fri, 13 Jan 2012 01:18:02 +0000 (-0800) Subject: mm: memcg: remove optimization of keeping the root_mem_cgroup LRU lists empty X-Git-Tag: v3.3-rc1~81^2~73 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ad2b8e601099a23dffffb53f91c18d874fe98854;p=pandora-kernel.git mm: memcg: remove optimization of keeping the root_mem_cgroup LRU lists empty 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. This is purely about the LRU list, root_mem_cgroup is still not charged. The overhead is temporary until the double-LRU scheme is going away completely. Signed-off-by: Johannes Weiner Reviewed-by: KAMEZAWA Hiroyuki Reviewed-by: Michal Hocko Reviewed-by: Kirill A. Shutemov Cc: Daisuke Nishimura Cc: Balbir Singh Cc: Ying Han Cc: Greg Thelen Cc: Michel Lespinasse Cc: Rik van Riel Cc: Minchan Kim Cc: Christoph Hellwig Cc: Hugh Dickins Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Reading git-diff-tree failed