From: Johannes Weiner Date: Wed, 4 Jun 2014 23:07:01 +0000 (-0700) Subject: mm: memcontrol: remove hierarchy restrictions for swappiness and oom_control X-Git-Tag: omap-for-v3.16/fixes-against-rc1~56^2~16^2~212 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3dae7fec5e884a4e72e5416db0894de66f586201;p=pandora-kernel.git mm: memcontrol: remove hierarchy restrictions for swappiness and oom_control Per-memcg swappiness and oom killing can currently not be tweaked on a memcg that is part of a hierarchy, but not the root of that hierarchy. Users have complained that they can't configure this when they turned on hierarchy mode. In fact, with hierarchy mode becoming the default, this restriction disables the tunables entirely. But there is no good reason for this restriction. The settings for swappiness and OOM killing are taken from whatever memcg whose limit triggered reclaim and OOM invocation, regardless of its position in the hierarchy tree. Allow setting swappiness on any group. The knob on the root memcg already reads the global VM swappiness, make it writable as well. Allow disabling the OOM killer on any non-root memcg. Signed-off-by: Johannes Weiner Cc: Michal Hocko Cc: Tejun Heo Cc: David Rientjes Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Reading git-diff-tree failed