[linux-pm] Re: [PATCH 0/2 -mm] kexec based hibernation -v5

[Phillip Susi]

Huang, Ying wrote:
> The hibernation procedure with the patch set is as follow:
> 
> 1. Boot a kernel A
> 
> 2. Work under kernel A
> 
> 3. Kexec another kernel B (crash dump enabled) in kernel A.
> 
> 4. Save the memory image of kernel A through crash dump (such as "cp
>    /proc/vmcore ~"). Save the "jump back entry".

Doesn't this also save the memory of kernel B?

> 5. Shutdown or reboot
> 
> 
> The restore process with the patch set is as follow:
> 
> 1. Boot a kernel C (crash dump enabled), the memory area used by
>    kernel C must be a subset of memory area used by kernel B.

Why is a third kernel needed?  Why can't kernel B be used for this as 
well?  In fact, if kernel A has been compiled to be relocatable and 
crash dump enabled, why wouldn't it suffice for all 3 instances?


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