The main takeaway from this: - Pre-zeroing a page only takes 80ns on a modern cpu. vm_fault overhead in general is ~at least 1 microscond.

The main takeaway from this: - Pre-zeroing a page only takes 80ns on a modern cpu. vm_fault overhead in general is ~at least 1 microscond. - Multiple synth and build tests show that active idle-time zeroing of pages actually reduces performance somewhat and incidental allocations of already-zerod pages (from page-table tear-downs) do not affect performance in any meaningful way. Not surprising. I've seen so much code with comments explaining how expensive copying or zeroing memory is (but not actually measuring it), that that's why "zero-copy" techniques are used. Ending up doing so much work (spending even microseconds) to "save" the cost that turns out to be 100 ns or less.