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 JbEc6sik 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Arora wrote: >> This series adds clearing of contiguous page ranges for hugepages, >> improving on the current page-at-a-time approach in two ways: >> >> - amortizes the per-page setup cost over a larger extent >> >> - when using string instructions, exposes the real region size >> to the processor. >> >> A processor could use a knowledge of the extent to optimize the >> clearing. AMD Zen uarchs, as an example, elide allocation of >> cachelines for regions larger than L3-size. >> >> Demand faulting a 64GB region shows performance improvements: >> >> $ perf bench mem map -p $pg-sz -f demand -s 64GB -l 5 >> >> mm/folio_zero_user x86/folio_zero_user change >> (GB/s +- %stdev) (GB/s +- %stdev) >> >> pg-sz=2MB 11.82 +- 0.67% 16.48 +- 0.30% + 39.4% preempt=* >> >> pg-sz=1GB 17.14 +- 1.39% 17.42 +- 0.98% [#] + 1.6% preempt=none|voluntary >> pg-sz=1GB 17.51 +- 1.19% 43.23 +- 5.22% +146.8% preempt=full|lazy >> >> [#] Milan uses a threshold of LLC-size (~32MB) for eliding cacheline >> allocation, which is higher than the maximum extent used on x86 >> (ARCH_CONTIG_PAGE_NR=8MB), so preempt=none|voluntary sees no improvement >> with pg-sz=1GB. > > I'm picking up the tools/perf part for perf-tools-next (v6.18), already > almost 100% reviewed by Namhyung. Thanks! -- ankur