How to determine if the CPU supports HugePage?-优快云博客

本文介绍如何确定CPU是否支持HugePage，包括2MB和1GB大小的HugePage。通过检查/proc/cpuinfo文件中的特定标志，如pse和pdpe1gb，可以判断CPU对大页内存的支持情况。

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SOLUTION 已验证 - 已更新 2019年二月24日21:43 -

English

环境

Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
HugePage

问题

How to determine if the CPU supports HugePage?
How to determine if the CPU supports 2MB size HugePage?
How to determine if the CPU supports 1GB size HugePage?

决议

The presence of flag pse means CPU support 2MB size HugePage.

Raw

# grep pse /proc/cpuinfo | uniq
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm cpuid_fault epb invpcid_single pti intel_ppin ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid cqm xsaveopt cqm_llc cqm_occup_llc dtherm ida arat pln pts flush_l1d

The presence of flag pdpe1gb means CPU support 1GB size HugePage.

Eg:

Raw

# grep pdpe1gb /proc/cpuinfo | uniq
flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm cpuid_fault epb invpcid_single pti intel_ppin ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid cqm xsaveopt cqm_llc cqm_occup_llc dtherm ida arat pln pts flush_l1d