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sergey-cheperis/khugepaged-lockup.md

Created December 10, 2021 11:57
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Resolve khugepagesd 100% CPU usage or soft lockup
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khugepaged-lockup.md

Issue

When running calculations with high rate of memory allocation, khugepaged can use 100% CPU or even cause CPU lockup messages in the kernel log:

INFO: task khugepaged:212 blocked for more than 120 seconds.

Solution

Disable transparent huge pages.

echo never > /sys/kernel/mm/transparent_hugepage/enabled
echo never > /sys/kernel/mm/transparent_hugepage/defrag

This needs to be made persistent across reboots.

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