> This feature is powered by a Linux kernel patch that allows small contiguous blocks of memory to be returned to the host machine when they are no longer needed in the Linux guest. We updated the Linux kernel in WSL2 to include this patch, and modified Hyper-V to support this page reporting feature. In order to return as much memory to the host as possible, we periodically compact memory to ensure free memory is available in contiguous blocks. This only runs when your CPU is idle. You can see when this happens by looking for the ‘WSL2: Performing memory compaction’ message inside of the output of the dmesg command.