linux-kernel - Re: [ProbableSpam]Re: [PATCH 2/5] Container Freezer: Make refrigerator always available

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Date:	Wed, 13 Aug 2008 16:31:48 +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: [ProbableSpam]Re: [PATCH 2/5] Container Freezer: Make refrigerator always available

On Wednesday, 13 of August 2008, Matt Helsley wrote:
> 
> On Tue, 2008-08-12 at 22:49 +0200, Rafael J. Wysocki wrote:
> > On Tuesday, 12 of August 2008, Matt Helsley wrote:
> > > Now that the TIF_FREEZE flag is available in all architectures,
> > > extract the refrigerator() and freeze_task() from kernel/power/process.c
> > > and make it available to all.
> > > 
> > > The refrigerator() can now be used in a control group subsystem
> > > implementing a control group freezer.
> > > 
> > > 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>
> > 
> > Your Signed-off-by implies your Tested-by (at least it should ;-)).
> 
> I wasn't sure that was always true so I added it just in case. I'll take
> it out of any future postings.
> 
> > > ---
> > [--snip--]
> > > Index: linux-2.6.27-rc1-mm1/kernel/power/Kconfig
> > > ===================================================================
> > > --- linux-2.6.27-rc1-mm1.orig/kernel/power/Kconfig
> > > +++ linux-2.6.27-rc1-mm1/kernel/power/Kconfig
> > > @@ -85,6 +85,9 @@ config PM_SLEEP
> > >  	depends on SUSPEND || HIBERNATION || XEN_SAVE_RESTORE
> > >  	default y
> > >  
> > > +config FREEZER
> > > +	def_bool PM_SLEEP
> > > +
> > 
> > I'd still prefer this to go into a Kconfig in the parent directory (ie. where
> > freezer.c and the Makefile building it are located).  Otherwise it's guaranteed
> > to confuse someone.
> 
> 	I'm thinking of making a patch moving the cgroups config variables into
> a kernel/Kconfig.cgroups file. Would moving config FREEZER to such a
> file be satisfactory? Paul, what do you think?

Well, in fact FREEZER is not directly dependent on cgroups, as it can also
depend on PM_SLEEP, even if cgroups are not used at all.

I would just add 'Kconfig.freezer' to 'kernel', put 'config FREEZER' in there
and make it depend on whatever needs it.  Of course,
'source "kernel/Kconfig.freezer"' would have to be added to top-level
Kconfigs for all architectures, but please note that only a few architectures
include 'kernel/power/Kconfig', so you'd have to change the top-level
Kconfigs anyway.

Alternatively, you can just add 'config FREEZER' directly to the top-level
Kconfigs.

Thanks,
Rafael
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