Architecture

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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.

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