From 88fa523bff295f1d60244a54833480b02f775152 Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Sun, 9 Jun 2013 17:16:46 +0800 Subject: cpuset: allow to move tasks to empty cpusets Currently some cpuset behaviors are not friendly when cpuset is co-mounted with other cgroup controllers. Now with this patchset if cpuset is mounted with sane_behavior option, it behaves differently: - Tasks will be kept in empty cpusets when hotplug happens and take masks of ancestors with non-empty cpus/mems, instead of being moved to an ancestor. - A task can be moved into an empty cpuset, and again it takes masks of ancestors, so the user can drop a task into a newly created cgroup without having to do anything for it. As tasks can reside in empy cpusets, here're some rules: - They can be moved to another cpuset, regardless it's empty or not. - Though it takes masks from ancestors, it takes other configs from the empty cpuset. - If the ancestors' masks are changed, those tasks will also be updated to take new masks. v2: add documentation in include/linux/cgroup.h Signed-off-by: Li Zefan Signed-off-by: Tejun Heo --- include/linux/cgroup.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include/linux') diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h index 53e81a61be57..74e8b8e4cd7f 100644 --- a/include/linux/cgroup.h +++ b/include/linux/cgroup.h @@ -281,6 +281,9 @@ enum { * and take masks of ancestors with non-empty cpus/mems, instead of * being moved to an ancestor. * + * - cpuset: a task can be moved into an empty cpuset, and again it + * takes masks of ancestors. + * * - memcg: use_hierarchy is on by default and the cgroup file for * the flag is not created. * -- cgit v1.2.3