Re: [PATCH 2/6] Container Freezer: Make refrigerator always available

[Matt Helsley <matthltc@us.ibm.com>]

On Sat, 2008-08-02 at 00:53 +-0200, Rafael J. Wysocki wrote:
+AD4 On Friday, 1 of August 2008, Matt Helsley wrote:
+AD4 +AD4 
+AD4 +AD4 On Fri, 2008-08-01 at 16:27 +-0200, Thomas Petazzoni wrote:
+AD4 +AD4 +AD4 Hi,
+AD4 +AD4 +AD4 
+AD4 +AD4 +AD4 Le Thu, 31 Jul 2008 22:07:01 -0700,
+AD4 +AD4 +AD4 Matt Helsley +ADw-matthltc+AEA-us.ibm.com+AD4 a +AOk-crit :
+AD4 +AD4 +AD4 
+AD4 +AD4 +AD4 +AD4 --- a/kernel/Makefile
+AD4 +AD4 +AD4 +AD4 +-+-+- b/kernel/Makefile
+AD4 +AD4 +AD4 +AD4 +AEAAQA -5,7 +-5,7 +AEAAQA
+AD4 +AD4 +AD4 +AD4  obj-y     +AD0 sched.o fork.o exec+AF8-domain.o panic.o printk.o +AFw
+AD4 +AD4 +AD4 +AD4  	    cpu.o exit.o itimer.o time.o softirq.o resource.o +AFw
+AD4 +AD4 +AD4 +AD4  	    sysctl.o capability.o ptrace.o timer.o user.o +AFw
+AD4 +AD4 +AD4 +AD4 -	    signal.o sys.o kmod.o workqueue.o pid.o +AFw
+AD4 +AD4 +AD4 +AD4 +-	    signal.o sys.o kmod.o workqueue.o pid.o freezer.o +AFw
+AD4 +AD4 +AD4 
+AD4 +AD4 +AD4 I have the impression that the code in kernel/power/process.c was
+AD4 +AD4 +AD4 compiled only if CONFIG+AF8-PM+AF8-SLEEP was set. Now that the code has been
+AD4 +AD4 +AD4 moved to kernel/freezer.c, it is unconditionnaly compiled in every
+AD4 +AD4 +AD4 kernel. Is that correct ?
+AD4 +AD4 +AD4
+AD4 +AD4 +AD4 If so, is it possible to put this new feature under some
+AD4 +AD4 +AD4 CONFIG+AF8-SOMETHING option, for people who care about the kernel size ?
+AD4 +AD4 
+AD4 +AD4 	How about making it depend on a combination of CONFIG variables?
+AD4 +AD4 Here's an RFC PATCH. Completely untested.
+AD4 +AD4 
+AD4 +AD4 Signed-off-by: Matt Helsley +ADw-matthltc+AEA-us.ibm.com+AD4
+AD4 
+AD4 Can you please also make the contents of include/linux/freezer.h depend on
+AD4 CONFIG+AF8-FREEZER instead of CONFIG+AF8-PM+AF8-SLEEP?

Good point -- I'll add that to this patch and repost.

+AD4 Also, I'm not really sure if kernel/power/Kconfig is the right place to define
+AD4 CONFIG+AF8-FREEZER.

	There's no nice place to put it since we're dealing with CONFIG+AF8
variables in two different Kconfig files. I put it in
kernel/power/Kconfig because I wasn't certain Kbuild would do the right
thing if I referenced PM+AF8-SLEEP from init/Kconfig.

+AD4 Perhaps we should even move freezer.c from kernel/power to kernel

It's already there. Perhaps you meant something else
(kernel/power/process.c?)?

+AD4 and define CONFIG+AF8-FREEZER in Kconfig in there.  Andrew, what do you think?

The Kconfig files in kernel/ are Kconfig.hz and Kconfig.preemt which
don't seem appropriate. I suppose we could add another (perhaps
Kconfig.cgroup).

Thanks for the review+ACE

Cheers,
	-Matt