linux-kernel - Re: Fw: Re: [mm PATCH 4/6] RCU: (now) CPU hotplug

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Message-ID: <20070204125316.GA1945@elf.ucw.cz>
Date:	Sun, 4 Feb 2007 13:53:16 +0100
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	paulmck@...ux.vnet.ibm.com, Andrew Morton <akpm@...l.org>,
	Ingo Molnar <mingo@...e.hu>, dipankar@...ibm.com,
	Gautham Shenoy <ego@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Fw: Re: [mm PATCH 4/6] RCU: (now) CPU hotplug

Hi!

> > > > o	init/do_mounts_initrd.c line 57 handle_initrd().
> > > > 	This looks to be short term anyway, so OK to leave.
> > > > 	But does kernel_execve() clear PF_NOFREEZE?
> > > > 
> > > > 	But it should be OK to freeze the init process when doing CPU
> > > > 	hotplug ops, right?
> > > 
> > > That looks bogus. If it is short term, it can as well live _without_
> > > PF_NOFREEZE. Noone should suspend system at that stage, right?
> >
> > I agree that any attempt to freeze that early in boot would be
> > at best an act of extreme bravery!
> 
> This is needed so that the _resume_ works, when it's handled from the user land
> by our resume tool.  Currently, the resume code calls
> freeze_processes() too.

I do not understand... freeze_processes() always leaves curent process
running... why is it needed?
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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