linux-kernel - Re: [PATCH 4/6] Container Freezer: Skip frozen cgroups during power management resume

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Date:	Fri, 01 Aug 2008 20:24:40 +1000
From:	Nigel Cunningham <ncunningham@...a.org.au>
To:	Matt Helsley <matthltc@...ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"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: Re: [PATCH 4/6] Container Freezer: Skip frozen cgroups during
	power management resume

Hi.

On Thu, 2008-07-31 at 22:07 -0700, 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>

I understand the freezer pretty well, so maybe I can help a little.

Acked-by: Nigel Cunningham <nigel@...onice.net>

> ---
>  kernel/power/process.c |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
> 
> diff --git a/kernel/power/process.c b/kernel/power/process.c
> index 444cea8..ce9e280 100644
> --- a/kernel/power/process.c
> +++ b/kernel/power/process.c
> @@ -13,6 +13,7 @@
>  #include <linux/module.h>
>  #include <linux/syscalls.h>
>  #include <linux/freezer.h>
> +#include <linux/cgroup_freezer.h>
>  
>  /* 
>   * Timeout for stopping processes
> @@ -135,6 +136,9 @@ 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);
> -- 
> 1.5.3.7
> 

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