[Devel] Re: [RFC v6][PATCH 0/9] Kernel based checkpoint/restart

[Cedric Le Goater]

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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