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

[Matt Helsley]

From: Cedric Le Goater <clg@xxxxxxxxxx>
Subject: [PATCH 4/4] Container Freezer: Skip frozen cgroups during power management resume

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@xxxxxxxxxx>
Signed-off-by: Matt Helsley <matthltc@xxxxxxxxxx>
Tested-by: Matt Helsley <matthltc@xxxxxxxxxx>
---
 kernel/power/process.c |    4 ++++
 1 file changed, 4 insertions(+)

Index: linux-2.6.26-rc5-mm2/kernel/power/process.c
===================================================================
--- linux-2.6.26-rc5-mm2.orig/kernel/power/process.c
+++ linux-2.6.26-rc5-mm2/kernel/power/process.c
@@ -11,10 +11,11 @@
 #include <linux/interrupt.h>
 #include <linux/suspend.h>
 #include <linux/module.h>
 #include <linux/syscalls.h>
 #include <linux/freezer.h>
+#include <linux/cgroup_freezer.h>
 
 /* 
  * Timeout for stopping processes
  */
 #define TIMEOUT	(20 * HZ)
@@ -133,10 +134,13 @@ static void thaw_tasks(bool nosig_only)
 			continue;
 
 		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);
 }
 

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