e4b8deb222
This change converts most of the counters in the amd64 pmap from global atomics to scalable counter(9) counters. Per discussion with kib@, it also removes the handrolled per-CPU PCID save count as it isn't considered generally useful. The bulk of these counters remain guarded by PV_STATS, as it seems unlikely that they will be useful outside of very specific debugging scenarios. However, this change does add two new counters that are available without PV_STATS. pt_page_count and pv_page_count track the number of active physical-to-virtual list pages and page table pages, respectively. These will be useful in evaluating the memory footprint of pmap structures under various workloads, which will help to guide future changes in this area. Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D28923
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