linux-kernel - Re: [RFC v6][PATCH 0/9] Kernel based checkpoint/restart

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Message-Id: <1223916223.29877.14.camel@nimitz>
Date:	Mon, 13 Oct 2008 09:43:43 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Cedric Le Goater <clg@...ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, jeremy@...p.org, arnd@...db.de,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrey Mirkin <major@...nvz.org>
Subject: Re: [RFC v6][PATCH 0/9] Kernel based checkpoint/restart

On Mon, 2008-10-13 at 10:13 +0200, Cedric Le Goater wrote:
> hmm, that's rather complex, because we have to take into account the 
> kernel stack, no ? This is what Andrey was trying to solve in his patchset 
> back in September :
> 
>         http://lkml.org/lkml/2008/9/3/96
> 
> the restart phase simulates a clone and switch_to to (not) restore the kernel 
> stack. right ? 

Do we ever have to worry about the kernel stack if we simply say that
tasks have to be *in* userspace when we checkpoint them.  If a task is
in an uninterruptable wait state, I'm not sure it's safe to checkpoint
it anyway.

-- Dave

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