LKML News v5.16-rc5

[RFC] mm: introduce page pinner (Minchan Kim)

https://lkml.kernel.org/r/20211206184730.858850-1-minchan@kernel.org

Page migrations commonly fails from temporal referenc count elevation. Worse yet, it’s hard to know which kernel subsystem has made the temporal reference count increase. To tracking it available, Minchan is proposing a new feature called page pinner. It tracks page put operations for pages that migration failed.

mmotm 2021-12-06-22-21 uploaded (Andrew Morton)

https://lkml.kernel.org/r/20211207062141.pMgbjXQXy%akpm@linux-foundation.org

mmotm based on v5.16-rc4 has uploaded. 14 new patches are added, 3 existign patches modified, and 1 existing patch has dropped from the queue. The queue has 268 patches in total now.

[PATCH -V10 RESEND 0/6] NUMA balancing: optimize memory placement for memory tiering system (Huang Ying)

https://lkml.kernel.org/r/20211207022757.2523359-1-ying.huang@intel.com

This patchset optimize the page placement on tiered memory system equipping DRAM with PMEM.

[PATCH v4 1/3] mm: protect free_pgtables with mmap_lock write lock in exit_mmap (Suren Baghdasaryan)

https://lkml.kernel.org/r/20211208212211.2860249-1-surenb@google.com

This patchset makes exit_mmap to hold mmap_write_lock to make locking from oom-reaper and process_mlrelease() simpler.

[PATCH] mm/madvise: pageout under plugging (Minchan Kim)

https://lkml.kernel.org/r/20211210003019.1481269-1-minchan@kernel.org

This commit makes madvise(PAGEOUT) to have the per-page memory block plugging benefit (3da367c3e5fc, vmscan: add block plug for page reclaim).

incoming (Andrew Morton)

https://lkml.kernel.org/r/20211210144539.663efee2c80d8450e6180230@linux-foundation.org

A pull request for mm fixes has sent to Linus Torvalds. It contains DAMON fake load fix and trivial fixups.

Linux 5.16-rc5 (Linus Torvalds)

https://lkml.kernel.org/r/CAHk-=wixe1NPqC0PmgUbV0Xoa8D0Pbyu7X_0sfABYMG+ocLdbQ@mail.gmail.com

Fifth release candidate for v5.16 is a bit bigger than usual, but no real problem has found. This might be due to people who trying to do works before the holidays, and Linus is warning such people. He also plans to have one more release candidate for this cycle, to avoid opening merge window immediately in the new year.

Below is the diffstat of the releases in the last two years.

Note that the y-axis is in logarithm. I draw it using https://github.com/sjp38/relstat and https://github.com/sjp38/lazybox using below command:

$ relstat.py --since 2019-12-13 | ~/lazybox/gnuplot/plot.py \
    --data_fmt table --type labeled-lines --xtics_rotate -90 \
    --font "Times New Roman, 5pt" --ylog --pointsize 0.3

And, below is the diffstat of the -rc4 releases in the last two years.