From: Matt Helsley <matthltc@us.ibm.com>
Date: Sun, 19 Oct 2008 03:27:22 +0000 (-0700)
Subject: container freezer: skip frozen cgroups during power management resume
X-Git-Tag: v2.6.28-rc1~200
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=5a06915c6df9b89cda5ddb3f8cce5f9a6be534d2;p=linux-2.6-omap-h63xx.git

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>
Acked-by: Serge E. Hallyn <serue@us.ibm.com>
Tested-by: Matt Helsley <matthltc@us.ibm.com>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/kernel/power/process.c b/kernel/power/process.c
index 444cea80fde..ca634019497 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -135,6 +135,9 @@ 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);