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Subject[RFC][PATCH 4/5] 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@fr.ibm.com>
Signed-off-by: Matt Helsley <matthltc@us.ibm.com>
Tested-by: Matt Helsley <matthltc@us.ibm.com>
---
kernel/power/process.c | 4 ++++
1 file changed, 4 insertions(+)
Index: linux-2.6.25-mm1/kernel/power/process.c
===================================================================
--- linux-2.6.25-mm1.orig/kernel/power/process.c
+++ linux-2.6.25-mm1/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)
@@ -150,10 +151,13 @@ static void thaw_tasks(int thaw_user_spa
continue;

if (!p->mm == thaw_user_space)
continue;

+ if (cgroup_frozen(p))
+ continue;
+
thaw_process(p);
} while_each_thread(g, p);
read_unlock(&tasklist_lock);
}

--


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