On Wed, Jun 03, 2009 at 08:12:19PM -0400, Oren Laadan wrote: > From 3c24531980764a71705492c2dfc2cc99366784f3 Mon Sep 17 00:00:00 2001 > From: Oren Laadan <orenl@xxxxxxxxxxxxxxx> > Date: Wed, 3 Jun 2009 19:31:21 -0400 > Subject: [PATCH] c/r: use CHECKPOINTING state for hierarchy's cgroup freezer > > Set state of freezer cgroup of checkpointed task hierarchy to > "CHECKPOINTING" during a checkpoint, to ensure that tasks cannot > be thawed while at it. > > get_container() grabs a reference to the root task's freezer cgroup. > Then in may_checkpoint_task() each it verifies that all tasks belong > to the same freezer group. Ugh, I really don't like grabbing this reference. It may be necessary though -- I need to think about it more. > > In particular, the root task is also tested, such that if the root > tasks changes its freezer cgroups before it moves to "CHECKPOINTING", > it will be notived and an error returned. Tasks in a CHECKPOINTING cgroup are frozen and frozen tasks cannot move. See freezer_can_attach(). This does rather complicate self-checkpoint though! See my reply to your follow-on patches.. Cheers, -Matt Helsley _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers
