Hi, > And I'm not sure if khugepaged may have race condition with split, it > sounds unlikely, but collapsing PTE-mapped THP support was added in > v5.8, so you may try to reproduce this on v5.7 to narrow it down. This is the test result on linux 5.7.17/5.8.18/5.9.16 with CONFIG_DEBUG_VM=y and CONFIG_TRANSPARENT_HUGEPAGE_ALWAYS=y, but without the debug patch from Yang Shi linux 5.7.17: this problem yet not happan after 6 tests. linux 5.8.18: this problem yet not happan after 6 tests. linux 5.19.16: this problem yet not happen ater 5 tests, but triggered a new problem, see dmesg-5.9.16.txt we also noticed that the btrfs filesystem performance improvement in 5.10.x, that maybe change the memory reclaim frequency too. Best Regards Wang Yugui (wangyugui@xxxxxxxxxxxx) 2021/04/27
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