[$] A parallel path for GPU restore in CRIU

The fundamental concept of checkpoint/restore is elegant: capture a
process's state and resurrect it later, perhaps elsewhere. Checkpointing
meticulously records a process's memory, open files, CPU state, and more into a
snapshot. Restoration then reconstructs the process from this state. This
established technique faces new challenges with GPU-accelerated applications,
where low-latency restoration is crucial for
fault
tolerance, live migration, and
fast startups. Recently, the restore process for AMD GPUs has been redesigned to
eliminate substantial bottlenecks.