Comment # 6 on bug 1206848 from Michael Pujos

I'm also observing this on my laptop with latest TW as of the date of this
post.It happened recently with newer kernel.

100% khugepaged happened with the following RAM usage:

                total        used        free      shared  buff/cache  
available
Mem:            14Gi       9.5Gi       866Mi       1.8Gi       6.9Gi      
5.3Gi
Swap:           15Gi       9.0Mi        15Gi


Closing Thunderbird made the 100% usage go away immediately, resulting in:

               total        used        free      shared  buff/cache  
available
Mem:            14Gi       8.5Gi       1.8Gi       1.2Gi       6.4Gi      
6.3Gi
Swap:           15Gi       9.0Mi        15Gi


I do not know if it is related to Thunderbird or just the fact that closing it
frees some memory. Next time this issue happens I'll try closing Firefox or my
IDE.
Restarting Thunderbird does not cause 100% khugepaged usage, although I'm
pretty certain it will happened again.

Inxi output:

CPU: 6-core Intel Core i7-8850H (-MT MCP-) speed/min/max: 2990/800/4300 MHz
Kernel: 6.1.3-1-default x86_64 Up: 4h 33m Mem: 10518.3/15213.1 MiB (69.1%)
Storage: 1.82 TiB (61.6% used) Procs: 363 Shell: Bash inxi: 3.3.23