[CRIU] Can we checkpoint and restore several threads of a process separately?

[chenjianguo]

Dear ALL，

     Can we checkpoint and restore several threads of a process separately?

     Suppose there is an arm64 Linux process. It creates some threads to 
interact with the hardware，which we can name bottom soft threads, and 
also create some threads to interact with these bottom soft threads, 
which we call high soft threads; we want to checkpoint and restore only 
high soft threads. can we do it?

     In addition, if the process will be C/R is an ARM64 ILP32 one, do 
we need to use the CRIU of ARM64 ILP32?  Do we support CRIU for arm64 
ilp32 now?

Best,
Phenix