D25187.id72824.diff
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	Index: sys/amd64/amd64/pmap.c
	===================================================================
	--- sys/amd64/amd64/pmap.c
	+++ sys/amd64/amd64/pmap.c
	@@ -3785,6 +3785,19 @@
	* one or two pages may be held during the wait, only to be released
	* afterwards. This conservative approach is easily argued to avoid
	* race conditions.
	+ *
	+ * Page table entry at address va page index is defined as follows:
	+ * - for page table (last level), ptepindex = pmap_pde_pindex(va) =
	+ * = va >> PDRSHIFT, in other words, it is just the index of the PDE.
	+ * - for page directory page, ptepindex = NUPDE (number of userland PD
	+ * entries) + (pmap_pde_index(va) >> NPDEPGSHIFT)
	+ * i.e. index of PDPE is put after the last index of PDE,
	+ * - for page directory pointer page, ptepindex = NUPDE + NUPDPE +
	+ * (pmap_pde_index(va) >> (NPDEPGSHIFT + NPML4EPGSHIFT),
	+ * i.e. index of pml4e is put after the last index of PDPE.
	+ * In other words, is it sequential number of the corresponding paging entry
	+ * in the order where all entries of the same rank are put together, then
	+ * ranks are put from deepest to root.
	*/
	static vm_page_t
	_pmap_allocpte(pmap_t pmap, vm_pindex_t ptepindex, struct rwlock **lockp)