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Importing a new version from external source
Main drawback of this solution is that it is necessary to maintain mapping of virtual PIDs to global PIDs, which introduces additional overhead for all the syscalls using a PID as an argument or a return value (f.e. <code>kill()</code>, <code>wait4()</code>, <code>fork()</code>). The overhead (~0.3%) is visible in the tests, which essentially do nothing but forking and stopping processes. This overhead appears only for online migrated containers. There are no overhead at all for containers, which never migrated.
