The <code>get_filemap_fd()</code> opens new fd every time. If a file is mapped several
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times (e.g. -- a library) we can share one fd for that.
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=== Staging ===
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When restoring a single task CRIU uses [[stages of restoring]] which slows things down. Need either special-care the single task restore, or introduce fine-grained locking for such things.