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When taking a dump of a process tree, it's totally correct to copy contents of all the anonymous private mappings independently and restore them in the same way -- just mmap and put the memory in there. But with this approach we effectively do the described memory duplication and thus increase memory usage by checkpointed and restore application.
When taking a dump of a process tree, it's totally correct to copy contents of all the anonymous private mappings independently and restore them in the same way -- just mmap and put the memory in there. But with this approach we effectively do the described memory duplication and thus increase memory usage by checkpointed and restore application.
To fix this, criu in version 0.3 and above do special tricks.
To fix this, criu in version 0.3 and above does special tricks.
== How restore works to keep COW intact ==
== How restore works to keep COW intact ==