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

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Date:	Tue, 12 Aug 2008 22:50:08 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Matt Helsley <matthltc@...ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	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: Re: [PATCH 4/5] Container Freezer: Skip frozen cgroups during power management resume

On Tuesday, 12 of August 2008, Matt Helsley wrote:
> 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>

Acked-by: Rafael J. Wysocki <rjw@...k.pl>

> ---
>  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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