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

[Rafael J. Wysocki]

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 at fr.ibm.com>
> Signed-off-by: Matt Helsley <matthltc at us.ibm.com>
> Acked-by: Serge E. Hallyn <serue at us.ibm.com>
> Tested-by: Matt Helsley <matthltc at us.ibm.com>

Acked-by: Rafael J. Wysocki <rjw at sisk.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);
>