Security of OS-level virtualization technologies [pdf] (arxiv.org)

I thought that linking to the abstract (in this case: http://arxiv.org/abs/1407.4245) is preferred, because that way updated versions of the paper will be visible, whereas linking directly to PDF gives you a specific version that cannot be updated. I don't remember where I've seen that recommendation though (can't find anything about it on arxiv.org itself).