On 06/20/2018 10:15 PM, Peter Zijlstra wrote:

On Mon, Jun 18, 2018 at 12:14:04PM +0800, Waiman Long wrote:

quoted

diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index 5ee5e77..6ef3516 100644
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst

@@ -1626,6 +1626,13 @@ Cpuset Interface Files
 	2) No CPU that has been distributed to child scheduling domain
 	   roots is deleted.
 
+	When all the CPUs allocated to a scheduling domain are offlined,
+	that scheduling domain will be temporaily gone and all the
+	tasks in that scheduling domain will migrate to another one that
+	belongs to the parent of the scheduling domain root.  When any
+	of those offlined CPUs is onlined again, a new scheduling domain
+	will be re-created and the tasks will be migrated back.
+

You should mention that this is a destructive operation. If any of the
tasks had an affinity smaller than the original cgroup, that will be
gone.

Thanks for the information. Will update the documentation to mention that.

Cheers,
Longman

--
To unsubscribe from this list: send the line "unsubscribe linux-doc" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html