As today is the first day of 2026, I checked my open source commits statistics using my simple and buggy scripts. Similar statistics for 2024 is available at another post.
Note that the script may have bugs, and numbers don’t tell everything.
TL; DR
In short, I made 2nd and 1st biggest changes to Linux kernel memory management subsystem among the 321 people, in terms of lines of changes (6,661 / 73,685 lines) and commits (199 / 1,870 commits).
For the Linux kernel whole tree, the numbers become 71-st (11,362 / 4,809,577 lines) and 25th (333 / 75,462 commits) among 5,637 people.
For open source projects other than Linux, I made around 564,210 lines of changes with around 2,157 commits.
Linux kernel statistics
I mostly work on Linux kernel for fun and profit. So made the 2025 statistics for Linux kernel.
Linux kernel memory management subsystem
Linux is a huge system that constructed with a number of subsystems. Among the subsystems, I mostly work on DAMON and memory management subsystems. DAMON is also a part of memory management subsystem. Let’s see the statistics for memory mangement subsystem, first.
I ran my script to show some 2024 statistics for memory management subsystem and whole tree of Linux kernel as below.
In terms of the number of changed lines
In 2025, 321 people made 73,685 lines of changes to Linux kernel memory management subsystem. Among the people, I made second biggest lines of changes (6,661 / 73,685 lines).
$ ./authors.py ~/linux --commits linus/master \
--linux_subsystems "MEMORY MANAGEMENT" \
--since 2025-01-01 --until 2025-12-31 \
--skip_merge_commits --sortby lines --max_nr_authors 9
[...]
2. SeongJae Park <sj@kernel.org>: 6661 lines
[...]
# 321 authors, 73685 lines in total
To show the overall numbers distribution and where I am, I ran another script to plot the distribution and where I am.
$ ./authors.py ~/linux --commits linus/master \
--linux_subsystems "MEMORY MANAGEMENT" \
--since 2025-01-01 --until 2025-12-31 \
--skip_merge_commits --sortby lines --max_nr_authors 400 \
--pr_for_plot |
../format_data/plot/plot.py 2025_changed_lines_per_author_linux_mm.png \
--xlog --ylog --pointsize 0.3 --gnuplot_arrow 4 12000 2 6661
The resuling plot is like below. The arrow is showing where I am. Note that both x and y axes are in logscale.
In terms of the nuber of commits
In 2025, the 321 people made 1,870 commits to Linux kernel memory management subsystem. Among the people, I made the biggest number of commits (199 / 1,870 commits).
$ ./authors.py ~/linux --commits linus/master \
--linux_subsystems "MEMORY MANAGEMENT" \
--since 2025-01-01 --until 2025-12-31 \
--skip_merge_commits --sortby commits --max_nr_authors 9
1. SeongJae Park <sj@kernel.org>: 199 commits
[...]
# 321 authors, 1870 commits in total
To show the overall numbers distribution and where I am, I ran another script to plot the distribution and where I am.
$ ./authors.py ~/linux --commits linus/master \
--linux_subsystems "MEMORY MANAGEMENT" \
--since 2025-01-01 --until 2025-12-31 \
--skip_merge_commits --sortby commits --max_nr_authors 400 \
--pr_for_plot |
../format_data/plot/plot.py 2025_commits_per_author_linux_mm.png \
--xlog --ylog --pointsize 0.3 --gnuplot_arrow 2 300 1 199
The resuling plot is like below. The arrow is showing where I am. Note that both x and y axes are in logscale.
Linux kernel whole tree
I’m not working only on memory mangement subsystems. Also, some DAMON source files are outside of memory management subsystem. I therefore made the statistics for whole Linux tree.
In terms of the number of changed lines
In 2025, 5,637 people made 4,089,577 lines of changes to Linux kernel. Among the people, I made 71-st biggeest amount of changes (11,362 / 4,809,577 lines).
$ ./authors.py ~/linux --commits linus/master \
--since 2025-01-01 --until 2025-12-31 \
--skip_merge_commits --sortby lines --max_nr_authors 6000
[...]
71. SeongJae Park <sj@kernel.org>: 11362 lines
[...]
# 5637 authors, 4809577 lines in total
To show the overall numbers distribution and where I am, I ran another script to plot the distribution and where I am.
$ ./authors.py ~/linux --commits linus/master \
--since 2025-01-01 --until 2025-12-31 \
--skip_merge_commits --sortby lines --max_nr_authors 6000 \
--pr_for_plot |
../format_data/plot/plot.py 2025_changed_lines_per_author_linux.png \
--ylog --xlog --pointsize 0.3 --gnuplot_arrow 100 50000 71 11362
The resuling plot is like below. The arrow is showing where I am. Note that both x and y axes are in logscale.
In terms of the nuber of commits
In 2025, the 5,637 people made 75,462 commits to Linux kernel. Among the people, I made the 25-th biggest number of commits (333 / 5,637 commits).
$ ./authors.py ~/linux --commits linus/master \
--since 2025-01-01 --until 2025-12-31 \
--skip_merge_commits --sortby commits --max_nr_authors 6000
[...]
25. SeongJae Park <sj@kernel.org>: 333 commits
[...]
# 5637 authors, 75462 commits in total
To show the overall numbers distribution and where I am, I ran another script to plot the distribution and where I am.
$ ./authors.py ~/linux --commits linus/master \
--since 2025-01-01 --until 2025-12-31 \
--skip_merge_commits --sortby commits --max_nr_authors 6000 \
--pr_for_plot |
../format_data/plot/plot.py 2025_commits_per_author_linux.png \
--xlog --ylog --pointsize 0.3 --gnuplot_arrow 40 500 25 333
The resuling plot is like below. The arrow is showing where I am. Note that both x and y axes are in logscale.
Non-Linux Kernel Contributions
In 2025, I also I spend some of my time on projects other than Linux kernel including
- DAMON user-space tool (
damo), - an email tool for DAMON and Linux kernel contributors
(
hkml), - my personal scripts toolbox (’lazybox’), and
Let’s see simple record of my contributions on those.
$ ./profile_author.py SeongJae --repo ~/damo --max_files 5 --since 2025-01-01 --until 2025-12-31
# below changes made by
# - SeongJae Park <sj@kernel.org>
# since 2025-01-05 09:37:04 -0800 until 2025-12-29 18:42:38 -0800
# <changed_lines> <file>
516424 tests/report/expects/report-heats
4166 tests/report/expects/report-detailed-inactive
3129 src/damo_report_access.py
1837 tests/report/expects/report-detailed-unmapped
1751 src/damo_report_heatmap.py
# 545688 total lines
# 147 total files
# 1291 commits
$ ./profile_author.py SeongJae --repo ~/hackermail --max_files 5 --since 2025-01-01 --until 2025-12-31
# below changes made by
# - SeongJae Park <sj@kernel.org>
# since 2025-01-02 11:05:19 -0800 until 2025-12-30 20:22:45 -0800
# <changed_lines> <file>
1720 src/hkml_view_mails.py
1132 src/hkml_list.py
923 src/hkml_patch_format.py
732 src/hkml_view_text.py
674 src/hkml_view.py
# 9051 total lines
# 44 total files
# 800 commits
$ ./profile_author.py SeongJae --repo ~/lazybox/ --max_files 5 --since 2025-01-01 --until 2025-12-31
# below changes made by
# - SeongJae Park <sj@kernel.org>
# since 2025-03-01 12:05:12 -0800 until 2025-12-30 22:12:02 -0800
# <changed_lines> <file>
542 scripts/gen_report/ltldat.py
542 format_data/ltldat.py
351 scripts/report/statof.py
212 gnuplot/plot.py
212 format_data/plot/plot.py
# 9471 total lines
# 232 total files
# 66 commits
Like other years, I made no small amount of changes for non-Linux projects in 2025. 2,157 commits of 56,4210 lines of change in total, for the three projects. As I committed not only for the three projects, the total numbers may slightly bigger.
Similar to 2024, I spent
most changes on damo. hkml has continued to be my another major project.
I also gave a presentation of the tool
at Open Source Summit Japan this year. I still commit on lazybox.
Especially, I completed the reorganization of the repo this year. As a result,
it got the 1st and 2nd biggest changes among the three projects, in terms of
the changed files and lines of code. Nonetheless, the number of commits for
lazybox is much smaller than those for the other two projects. The project
is somewhat matured now, and hence got not that much changes in 2025.