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FyqHuCv+wbhgHcH1psIuSfFZS6m1VryhZpvc1+ECklt2beD4MzZ2euAR7jT3E4VmZ+Bw0XI6kiQ n79Z2APuTipMmoWruDZ+FxGEhXRvw/5s+M8LjgN5FjF5Dc8C9xkeNNQGZhgBLt1v6nHD2x5K524 FKy5Sdnzfa3NskYHyesr5eiN7wytGhvk/k0HlRPWLhjTGjkE5E3muJFGrWv1hPcwM4DZ56m0w0+ QKffiJMAMYS2opUdDQG2fuSqkAn0qr2AIvbQcURXDU9JaXDg4HYd86LjM0EOhE9PklG7YZTcS+o FE76K6T8CqSkA2f7hroa3QVODa66nQ== X-Authority-Analysis: v=2.4 cv=cerSrmDM c=1 sm=1 tr=0 ts=68cb83e6 b=1 cx=c_pps a=qoll8+KPOyaMroiJ2sR5sw==:117 a=qoll8+KPOyaMroiJ2sR5sw==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=yJojWOMRYYMA:10 a=GoEa3M9JfhUA:10 a=VwQbUJbxAAAA:8 a=wIUMQn-w5GAMDpwLP48A:9 cc=ntf awl=host:12084 X-Proofpoint-ORIG-GUID: qIXIJUjkswS9eu76ngHGwMrMQBC7Duw5 Arnaldo Carvalho de Melo writes: > On Wed, Sep 17, 2025 at 08:24:02AM -0700, Ankur 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