libvirt users - Sep 2014 - How can I get the pid mapping relationship between the container and the native OS

Dear all,
I want to dynamically change the CPU affinity of multiple processes/threads
started in a container. Changing affinity operation is done in native OS. My
problem is how to obtain the mapping relationship between the two pids owned by
the process/thread. As you know, one pid is given by the container, which is
different from the corresponding pid seen by the native OS.
Thank you in advance.
Cheng

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