linux-kernel - [PATCH 4/5] Container Freezer: Skip frozen cgroups during power management resume

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Message-Id: <20080811235325.485466148@us.ibm.com>
Date:	Mon, 11 Aug 2008 16:53:27 -0700
From:	Matt Helsley <matthltc@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Paul Menage <menage@...gle.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Linux-Kernel <linux-kernel@...r.kernel.org>,
	Linux Containers <containers@...ts.linux-foundation.org>,
	linux-pm@...ts.linux-foundation.org,
	Cedric Le Goater <clg@...ibm.com>,
	"Serge E. Hallyn" <serue@...ibm.com>
Subject: [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@...ibm.com>
Signed-off-by: Matt Helsley <matthltc@...ibm.com>
Acked-by: Serge E. Hallyn <serue@...ibm.com>
Tested-by: Matt Helsley <matthltc@...ibm.com>
---
 kernel/power/process.c |    3 +++
 1 file changed, 3 insertions(+)

Index: linux-2.6.27-rc1-mm1/kernel/power/process.c
===================================================================
--- linux-2.6.27-rc1-mm1.orig/kernel/power/process.c
+++ linux-2.6.27-rc1-mm1/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);

-- 
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