caef3e1280
Summary: This matches r351198 from amd64. This only applies to AIM64 and Book-E. On AIM64 it short-circuits with one domain, to behave similar to existing. Otherwise it will allocate 16MB huge pages to hold the page array, across all NUMA domains. On the first domain it will shift the page array base up, to "upper-align" the page array in that domain, so as to reduce the number of pages from the next domain appearing in this domain. After the first domain, subsequent domains will be allocated in full 16MB pages, until the final domain, which can be short. This means some inner domains may have pages accounted in earlier domains. On Book-E the page array is setup at MMU bootstrap time so that it's always mapped in TLB1, on both 32-bit and 64-bit. This reduces the TLB0 overhead for touching the vm_page_array, which reduces up to one TLB miss per array access. Since page_range (vm_page_startup()) is no longer used on Book-E but is on 32-bit AIM, mark the variable as potentially unused, rather than using a nasty #if defined() list. Reviewed by: luporl Differential Revision: https://reviews.freebsd.org/D21449
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