Linux: Hibernation With Kexec

“Offering a potential alternative to the existing suspend and
restore implementations in the Linux Kernel, Ying Huang posted a
patch utilizing kexec, ‘kexec based hibernation has some potential
advantages over uswsusp and suspend2.’ He listed two such potential
advantages, ‘the hibernation image size can exceed half of memory
size easily,’ and, ‘the hibernation image can be written to and
read from almost anywhere, such as a USB disk [or] NFS.’ He
described the feature implemented by his patch as ‘jumping from a
kexeced kernel to the original kernel,’ allowing someone to first
boot from one kernel, then to kexec another crashdump kernel in
reserved memory and run from it for a while, and finally to ‘jump
back’ to the original kernel…”

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