LKML News v6.2-rc6

[RFC PATCH 00/19] mm: Introduce a cgroup to limit the amount of locked and pinned memory (Alistair Popple)

https://lkml.kernel.org/r/cover.f52b9eb2792bccb8a9ecd6bc95055705cfe2ae03.1674538665.git-series.apopple@nvidia.com

This RFC patchset introduces a cgroup limit like RLIMIT_MEMLOCKED but that for pinned pages.

[RFC PATCH 0/4] Fix excessive CPU usage during compaction (Mel Gorman)

https://lkml.kernel.org/r/20230125134434.18017-1-mgorman@techsingularity.net

A patch for not ignoring fast_find_migrateblock() found pageblocks made compaction shows high CPU and stalls. It therefore once merged in mainline, than reverted, and again merged in mm-unstable. This patch fixes the underlying problem of the issue, so that the revert of the patch and reverted later.

[PATCH v3 0/7] introduce vm_flags modifier functions (Suren Baghdasaryan)

https://lkml.kernel.org/r/20230125233554.153109-1-surenb@google.com

vm_flags are usually modified under exclusive mmap_lock protection to prevent racing with concurrent VMA operations like merging and splitting. This patchset introduces a modifier function that ensure correct locking.

This was a part of per-VMA locking, but separated.

[LSF/MM/BPF TOPIC] State Of The Page (Matthew Wilcox)

https://lkml.kernel.org/r/Y9KtCc+4n5uANB2f@casper.infradead.org

Matthew proposes a LSFMMBPF session for sharing page dismemberment progress and future plans.

Linux 6.2-rc6 (Linus Torvalds)

https://lkml.kernel.org/r/CAHk-=wiJcsgmgjEitJ97x3unFpaKv1d=YyNr_5NbOTGsGqCG=A@mail.gmail.com

Unlike the worries from last week, the sixth release candidate for Linux v6.2 looks fairly small and normal. Linus says it might be just a good sign but he will drag the release with rc8, as previously mentioned.

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 2021-01-30 | ~/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 -rc6 releases in the last two years.