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

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Message-ID: <48F6092D.6050400@fr.ibm.com>
Date:	Wed, 15 Oct 2008 17:15:57 +0200
From:	Cedric Le Goater <clg@...ibm.com>
To:	Dave Hansen <dave@...ux.vnet.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

Dave Hansen wrote:
> 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. 

at a syscall boundary for example. that would make our life easier 
definitely. 

C.

> If a task is
> in an uninterruptable wait state, I'm not sure it's safe to checkpoint
> it anyway.

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