Architecture

OBSOLETE CONTENT

This wiki has been archived and the content is no longer updated.

Supported architectures

The following architectures are currently supported:

• x86-32, x86-64
• PowerPC
• s390
• ARM

Compatibility of 32-bit/64-bit kernels

Original	Original	Restart	Target	ARCHITECTURE
Program	Kernel	Program	Kernel	x86	PowerPC
64 bit	64 bit	64 bit	64 bit	OK (1)	OK (1)
32 bit	32 bit	32 bit	32 bit	OK (1)	OK (1)
32 bit	64 bit	32 bit	64 bit	OK (1)	OK (1)
32 bit	32 bit	32 bit	64 bit	(2)	(2)
32 bit	64 bit	32 bit	32 bit	(2)	(2)
32 bit	any	64 bit	64 bit	(3)	(3)
64 bit	64 bit	32 bit	64 bit	(3)	(3)

(1) These cases are "homogeneous", with conditions equal at checkpoint and restart. These cases work.

(2) These cases consider 32 bit program, and vary only the environment - the kernel may change from 32 to 64 or back. For these to work, userspace will have to modify (at least) the arch-id of the checkpoint image, and perhaps other fields.

(3) These cases consider the restart program itself with different bit-ness than the checkpointed program. Transition may occur in either direction. For these, we will have userspace use execve() to re-launch itself with the proper bit-ness per process during the tree construction.