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authorCliff Wickman <cpw@sgi.com>2008-02-07 00:14:43 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-07 08:42:22 -0800
commit956db3ca0606e78456786ef19fd4dc7a5151a6e1 (patch)
tree0bef3d107df1115ecf76e342f30ecee67a7f3705 /include/linux
parent31a7df01fd0cd786f60873a921aecafac148c290 (diff)
hotplug cpu: move tasks in empty cpusets to parent
This patch corrects a situation that occurs when one disables all the cpus in a cpuset. Currently, the disabled (cpu-less) cpuset inherits the cpus of its parent, which is incorrect because it may then overlap its cpu-exclusive sibling. Tasks of an empty cpuset should be moved to the cpuset which is the parent of their current cpuset. Or if the parent cpuset has no cpus, to its parent, etc. And the empty cpuset should be released (if it is flagged notify_on_release). Depends on the cgroup_scan_tasks() function (proposed by David Rientjes) to iterate through all tasks in the cpu-less cpuset. We are deliberately avoiding a walk of the tasklist. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Cliff Wickman <cpw@sgi.com> Cc: Paul Menage <menage@google.com> Cc: Paul Jackson <pj@sgi.com> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/cgroup.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 8675c691d3e..ff9055fc3d2 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -318,6 +318,7 @@ struct task_struct *cgroup_iter_next(struct cgroup *cont,
struct cgroup_iter *it);
void cgroup_iter_end(struct cgroup *cont, struct cgroup_iter *it);
int cgroup_scan_tasks(struct cgroup_scanner *scan);
+int cgroup_attach_task(struct cgroup *, struct task_struct *);
#else /* !CONFIG_CGROUPS */