linux-kernel - Re: [RFC][PATCH -mm 2/3] freezer: Introduce freezer

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Date:	Tue, 24 Apr 2007 04:11:42 +0530
From:	Gautham R Shenoy <ego@...ibm.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Oleg Nesterov <oleg@...sign.ru>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	vatsa@...ibm.com, paulmck@...ibm.com, pavel@....cz
Subject: Re: [RFC][PATCH -mm 2/3] freezer: Introduce freezer_flags

On Tue, Apr 24, 2007 at 12:40:17AM +0200, Rafael J. Wysocki wrote:
> On Tuesday, 24 April 2007 00:23, Oleg Nesterov wrote:
> > On 04/22, Rafael J. Wysocki wrote:
> > > 
> > > Move all of the freezer-related flags to a separate field in task_struct and
> > > introduce functions to operate them using set_bit() etc.
> > >
> > > [...snip...]
> > >
> > > --- linux-2.6.21-rc6-mm1.orig/kernel/fork.c	2007-04-22 19:37:42.000000000 +0200
> > > +++ linux-2.6.21-rc6-mm1/kernel/fork.c	2007-04-22 20:55:01.000000000 +0200
> > > @@ -922,7 +922,7 @@ static inline void copy_flags(unsigned l
> > >  {
> > >  	unsigned long new_flags = p->flags;
> > >  
> > > -	new_flags &= ~(PF_SUPERPRIV | PF_NOFREEZE);
> > > +	new_flags &= ~PF_SUPERPRIV;
> > >  	new_flags |= PF_FORKNOEXEC;
> > >  	new_flags |= PF_STARTING;
> > >  	p->flags = new_flags;
> > 
> > OK, but you forgot to clear p->freezer_flags on copy_process()->dup_task_struct()
> > path ?
> 
> Yes, thanks for pointing that out.

That reminds me, shouldn't we set the child's TFF_FREEZE flag if the parent
is freezing or frozen? 

> 
> Should I clear it in dup_task_struct() or is there a better place?

Thanks and Regards
gautham.
-- 
Gautham R Shenoy
Linux Technology Center
IBM India.
"Freedom comes with a price tag of responsibility, which is still a bargain,
because Freedom is priceless!"
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