[PATCH 4/6] Container Freezer: Skip frozen cgroups during power management resume

[Matt Helsley <matthltc@us.ibm.com>]

When a system is resumed after a suspend, it will also unfreeze
frozen cgroups.

This patchs modifies the resume sequence to skip the tasks which
are part of a frozen control group.

Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
Signed-off-by: Matt Helsley <matthltc@us.ibm.com>
Acked-by: Serge E. Hallyn <serue@us.ibm.com>
Tested-by: Matt Helsley <matthltc@us.ibm.com>
---
 kernel/power/process.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/kernel/power/process.c b/kernel/power/process.c
index 444cea8..ce9e280 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -13,6 +13,7 @@
 #include <linux/module.h>
 #include <linux/syscalls.h>
 #include <linux/freezer.h>
+#include <linux/cgroup_freezer.h>
 
 /* 
  * Timeout for stopping processes
@@ -135,6 +136,9 @@ static void thaw_tasks(bool nosig_only)
 		if (nosig_only && should_send_signal(p))
 			continue;
 
+		if (cgroup_frozen(p))
+			continue;
+
 		thaw_process(p);
 	} while_each_thread(g, p);
 	read_unlock(&tasklist_lock);
-- 
1.5.3.7

--