I think in most situations it would make sense for the kernel to extend swap space by creating swap files on any filesystem with free space to which it has write access. OK, there will be marginal cases where there is overcommitted memory and insufficient free disk space to prevent serious thrashing due to the reducing free disk space this approach causes. However, system admins who want a more reliably-performing system have long known that they need to provide adequate memory and disk resources in any case. Why not have swap space dynamically extensible in this manner ?
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