Add 2022 retrospect draft

Signed-off-by: SeongJae Park <sj@kernel.org>

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+Subject: Retrospect DAMON development in 2022
+
+Hello,
+
+
+DAMON was first merged into and released with the last major Linux version of
+2021, v5.15.  After the initial release, one more thankful year has passed.
+I'd like to retrospect major events, share some development statistics, and say
+thank you to the community.
+
+TL; DR
+======
+
+2022 was an year of active and healthy DAMON development.
+
+Seven new DAMON major features have delivered to users.  Some of those were
+featured by articles and an academic paper.
+
+DAMON community has expanded with its own mailing list and open bi-weekly chat
+series.  32 people participated in DAMON development by making 212 commits be
+merged in the mainline.  About 33% of the commits were made by Amazon-external
+contributors.
+
+Quite amount of DAMON changes have made.  About 8% and 0.2% of commits for
+memory management subsystem and whole linux tree, and about 14% of lines of
+changes for memory management subsystem were made for DAMON.
+
+Key Events
+==========
+
+We started 2022 in January with Linux v5.16 release, which contained four major
+DAMON features including
+ - DAMON-based Operation Schemes,
+ - Physical address space monitoring support,
+ - DAMOS quota/priorities/watermarks, and
+ - Data Access-aware Reclaim module (DAMON_RECLAIM).
+
+In April, DAMON and DAMON_RECLAIM have merged[1] into Android.
+
+In May, v5.18 has released with DAMON sysfs interface, which is aimed to be the
+flexible and stable DAMON interface for long term usage.  We also made a
+mailing list which is dedicated for DAMON development (damon@lists.linux.dev).
+
+In June, we presented DAMON-related works in an academic conference, HPDC[2].
+
+In July, v5.19 has released with DAMON online tuning feature.  This opened the
+chance for more optimal and automated tuning of DAMON.  DAMON has also
+featured[3] on Embedded Linux Conference'22 keynote.
+
+In August, DAMON community started its bi-weekly virtual open chat series[4].
+DAMON-based Proactive LRU-lists Sorting patchset, which reduces about 20% of
+pressure stall time, has merged into the mainline and featured by LWN[5].
+
+In September, DAMON's curent status and future plans have presented[6] in
+KernelSummit.
+
+In October, v6.0 has released with DAMON-based Proactive LRU lists sorting.  We
+also had a first in-person DAMON community meetup[7] in LPC.
+
+In November and December, DAMOS tried regions patchset, which makes query-like
+efficient monitoring results collection available, and DAMOS filters patchset,
+which allows cgroups support of DAMON-based memory managements, have developed.
+The first one has merged in v6.2 merge window in December.  The second one is
+expected to be merged in v6.3 merge widnow.
+
+[1] https://android.googlesource.com/kernel/common/+/0496c13ded02bd72426d189b777bf303fe490f62
+[2] https://www.amazon.science/publications/daos-data-access-aware-operating-system
+[3] https://lwn.net/Articles/899742/
+[4] https://lore.kernel.org/damon/20220810225102.124459-1-sj@kernel.org/
+[5] https://lwn.net/Articles/905370/
+[6] https://lpc.events/event/16/contributions/1224/
+[7] https://lpc.events/event/16/contributions/1388/
+
+Development Statistics
+======================
+
+Contributors
+------------
+
+According to my humble script, 32 people have contributed to DAMON development
+in 2022-01-01.
+
+$ ./lazybox/git_helpers/authors.py --files mm/damon/ \
+        include/trace/events/damon.h include/linux/damon.h \
+        Documentation/admin-guide/mm/damon/ Documentation/mm/damon/ \
+        Documentation/vm/damon/ \
+        Documentation/ABI/testing/sysfs-kernel-mm-damon \
+        tools/testing/selftests/damon --since 2022-01-01 --skip_merge_commits \
+        --max_nr_authors 33 ./linux
+1. SeongJae Park <sj@kernel.org>: 143 commits
+2. Xin Hao <xhao@linux.alibaba.com>: 17 commits
+3. Kaixu Xia <kaixuxia@tencent.com>: 15 commits
+4. Baolin Wang <baolin.wang@linux.alibaba.com>: 5 commits
+5. Matthew Wilcox (Oracle) <willy@infradead.org>: 4 commits
+6. Yang Yingliang <yangyingliang@huawei.com>: 2 commits
+7. Rong Tao <rongtao@cestc.cn>: 1 commits
+8. Christophe JAILLET <christophe.jaillet@wanadoo.fr>: 1 commits
+9. Jason A. Donenfeld <Jason@zx2c4.com>: 1 commits
+10. Dawei Li <set_pte_at@outlook.com>: 1 commits
+11. Yajun Deng <yajun.deng@linux.dev>: 1 commits
+12. Levi Yun <ppbuk5246@gmail.com>: 1 commits
+13. Liam R. Howlett <Liam.Howlett@Oracle.com>: 1 commits
+14. Kenneth Lee <klee33@uw.edu>: 1 commits
+15. Greg Kroah-Hartman <gregkh@linuxfoundation.org>: 1 commits
+16. Badari Pulavarty <badari.pulavarty@intel.com>: 1 commits
+17. Kairui Song <kasong@tencent.com>: 1 commits
+18. Jianglei Nie <niejianglei2021@163.com>: 1 commits
+19. Gautam <gautammenghani201@gmail.com>: 1 commits
+20. Mike Rapoport <rppt@linux.ibm.com>: 1 commits
+21. Chengming Zhou <zhouchengming@bytedance.com>: 1 commits
+22. Kefeng Wang <wangkefeng.wang@huawei.com>: 1 commits
+23. Gautam Menghani <gautammenghani201@gmail.com>: 1 commits
+24. Jiapeng Chong <jiapeng.chong@linux.alibaba.com>: 1 commits
+25. Hailong Tu <tuhailong@gmail.com>: 1 commits
+26. Yu Zhe <yuzhe@nfschina.com>: 1 commits
+27. Xiaomeng Tong <xiam0nd.tong@gmail.com>: 1 commits
+28. Jonghyeon Kim <tome01@ajou.ac.kr>: 1 commits
+29. tangmeng <tangmeng@uniontech.com>: 1 commits
+30. Miaohe Lin <linmiaohe@huawei.com>: 1 commits
+31. Guoqing Jiang <guoqing.jiang@linux.dev>: 1 commits
+32. Yihao Han <hanyihao@vivo.com>: 1 commits
+# 32 authors, 212 commits in total
+
+Huge appreciation to all contributors!  We made it!
+
+Contributions from non-maintainer
+---------------------------------
+
+According to another humble script, about 33% of DAMON commits have made by
+people other than the maintainer (sj@kernel.org).
+
+$ ./damon_hack/stat_damon_portion_community_commits.sh ./linux
+range               from_sj from_comm from_comm portion
+v5.15..v5.16        50      13        20.63     %
+v5.16..v5.17        16      10        38.46     %
+v5.17..v5.18        26      10        27.78     %
+v5.18..v5.19        23      7         23.33     %
+v5.19..v6.0         15      14        48.28     %
+v6.0..v6.1          33      36        52.17     %
+v6.1..linus/master  28      6         17.65     %
+v5.15..linus/master 191     95        33.22     %
+
+Portion of DAMON Changes
+========================
+
+For simplicity, we count changes that made into only mm/damon/ and mm/ for
+DAMON and MM subsystems.
+
+By Number of Commits
+--------------------
+
+range               damon mm   damon/mm linux  damon/linux
+v5.15..v5.16        45    307  14.66%   14190  0.32%
+v5.16..v5.17        17    223  7.62%    13038  0.13%
+v5.17..v5.18        29    448  6.47%    14954  0.19%
+v5.18..v5.19        24    399  6.02%    15134  0.16%
+v5.19..v6.0         15    283  5.30%    15402  0.10%
+v6.0..v6.1          61    536  11.38%   13942  0.44%
+v6.1..linus/master  20    250  8.00%    13687  0.15%
+v5.15..linus/master 211   2446 8.63%    100347 0.21%
+
+By Number of Lines
+------------------
+
+$ ./stat_damon_portion_lines.sh ../linux | ~/lazybox/scripts/report/fmt_tbl.py
+range               damon mm    damon/mm
+v5.15..v5.16        2157  8503  25.37%
+v5.16..v5.17        324   9370  3.46%
+v5.17..v5.18        3462  16288 21.25%
+v5.18..v5.19        929   10185 9.12%
+v5.19..v6.0         870   8665  10.04%
+v6.0..v6.1          1752  25844 6.78%
+v6.1..linus/master  3309  10544 31.38%
+v5.15..linus/master 12803 89399 14.32%
+