Whenever reading the kernel development statistics report for each release from LWN, I wanted to scope it down to specific subsystems. For that, I wrote a script.
Belows are the top 10 kernel hackers who contributed to the memory management subsystem of Linux kernel, sorted by number of commits and changed (added, deleted, or modified) lines, respectively.
$ ./authors.py ~/linux --file mm/ --since 2021-01-01 --author_identity name --sortby lines --max_nr_authors 10 1.