linux-kernel - Re: [PATCH v2] cgroup/freezer: add per freezer duty ratio control

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Message-Id: <20110204163751.33ea54f3.akpm@linux-foundation.org>
Date:	Fri, 4 Feb 2011 16:37:51 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	jacob.jun.pan@...ux.intel.com
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Matt Helsley <matthltc@...ibm.com>,
	container cgroup <containers@...ts.linux-foundation.org>,
	Li Zefan <lizf@...fujitsu.com>, Paul Menage <menage@...gle.com>
Subject: Re: [PATCH v2] cgroup/freezer: add per freezer duty ratio control

On Wed,  2 Feb 2011 16:42:20 -0800
jacob.jun.pan@...ux.intel.com wrote:

> Freezer subsystem is used to manage batch jobs which can start
> stop at the same time. However, sometime it is desirable to let
> the kernel manage the freezer state automatically with a given
> duty ratio.
> For example, if we want to reduce the time that backgroup apps
> are allowed to run we can put them into a freezer subsystem and
> set the kernel to turn them THAWED/FROZEN at given duty ratio.
> 
> This patch introduces two file nodes under cgroup
> freezer.duty_ratio_pct and freezer.period_sec
> 
> Usage example: set period to be 5 seconds and frozen duty ratio 90%
> [root@...alhost aoa]# echo 90 > freezer.duty_ratio_pct
> [root@...alhost aoa]# echo 5 > freezer.period_sec
> 
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> ---
>  kernel/cgroup_freezer.c |  109 ++++++++++++++++++++++++++++++++++++++++++++++-
>  1 files changed, 107 insertions(+), 2 deletions(-)

Update the documentation please.  Documentation/cgroups/
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