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[OLK-5.10] libMicro/mprot相关用例相比4.19劣化20+%(KPTI被KASLR强制使能)
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#I4VSGH
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YangYingliang
Opened this issue
2022-03-01 16:10
- 跟踪到执行用例mprot_tw4m时,flush_tlb_range劣化达50%,进一步跟踪到__tlbi_user劣化45%,通过回退补丁基本排除函数本身代码差异。 - 执行时由于flush_tlb_range变慢而导致劣化,其根因是cpu_hwcap_keys[23]在4.19为false而在5.10为true,这导致5.10多刷1次__tlbi,从而劣化严重;关闭CONFIG_UNMAP_KERNEL_AT_EL0,mprot相关用例由最大劣化50%,变为与4.19持平;  
- 跟踪到执行用例mprot_tw4m时,flush_tlb_range劣化达50%,进一步跟踪到__tlbi_user劣化45%,通过回退补丁基本排除函数本身代码差异。 - 执行时由于flush_tlb_range变慢而导致劣化,其根因是cpu_hwcap_keys[23]在4.19为false而在5.10为true,这导致5.10多刷1次__tlbi,从而劣化严重;关闭CONFIG_UNMAP_KERNEL_AT_EL0,mprot相关用例由最大劣化50%,变为与4.19持平;  
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