LKML News v6.3-rc1

[GIT PULL] MM updates for 6.3-rc1 (Andrew Morton)

https://lkml.kernel.org/r/20230220135225.91b0f28344c01d5306c31230@linux-foundation.org

The mm updates pull request for v6.3-rc1 has posted by Andrew.

[GIT PULL] Compute Express Link (CXL) for 6.3 (Dan Williams)

https://lkml.kernel.org/r/63f5a4e2277b1_c94229453@dwillia2-mobl3.amr.corp.intel.com.notmuch

A pull request for makincg CXL handling including CXL memory layout parsing/updating and events/errors reporting has posted for v6.3. Without this patchset, currently the works are dependents on platform-firmware.

[RFC v2 0/5] tmpfs: add the option to disable swap (Luis Chamberlain)

https://lkml.kernel.org/r/20230223024412.3522465-1-mcgrof@kernel.org

This RFC adds noswap option to tmpfs.

[LSF/MM/BPF TOPIC] VM Memory Overcommit (T.J. Alumbaugh)

https://lkml.kernel.org/r/CABmGT5H6t_agW=yY1U78tsV+chLoRf2=mcSc8GCYUD25PbxahQ@mail.gmail.com

Yet another proposal for memory overcommitted virtual machines systems has posted. T.J proposes host-side efficient access tracking of guests’ memory for host-guests independent case, and guest working set size notification mechanism and ballooning improvement for host-guest cooperate case.

[LSF/MM/BPF TOPIC] Make bpf memory allocator more robust (Hou Tao)

https://lkml.kernel.org/r/2d29f66f-fcb1-ec76-c74f-d12495a9516f@huaweicloud.com

BPF memory allocator has introduced by Alexei Starovoitov in v6.1, but it has some problems. This LSF/MM/BPF topic proposal is for discussing it’s improvements.

[PATCH v4 00/33] Per-VMA locks (Suren Baghdasaryan)

https://lkml.kernel.org/r/20230227173632.3292573-1-surenb@google.com

Fourth version of the per-VMA locks patchset, which supposed to improve the vma locking scalability, has posted.

LSFMMBPF proposal [MM]: Eliminate vmap/vmalloc lock contention (Uladzislau Rezki)

https://lkml.kernel.org/r/Y/4vA1xdagP5UFVI@pc636

An LSF/MM/BPF topic proposal for improving vmap multi-CPU scalability, which is currently limited by use of single spinlock, has posted.

[LSF/MM/BPF TOPIC] Cloud storage optimizations (Theodore Ts’o)

https://lkml.kernel.org/r/Y/7L74P6jSWwOvWt@mit.edu

Ted proposes a LSF/MM/BPF topic for cloud storage optimizations, such as giving some useful hint for cloud storage to kernel.

[PATCH 1/1] psi: remove 500ms min window size limitation for triggers (Suren Baghdasaryan)

https://lkml.kernel.org/r/20230301193403.1507484-1-surenb@google.com

Current PSI limits polling interval to 50ms for preventing too much cpu time is used by too frequent polling. This patchset tries to limit psi trigger creation instead of limiting psi events latency.

[PATCHv3 0/4] zsmalloc: fine-grained fullness and new compaction algorithm (Sergey Senozhatsky)

https://lkml.kernel.org/r/20230303073130.1950714-1-senozhatsky@chromium.org

This patchset reworks zsmalloc fullness grouping and classification for optimal page selection.

Linux 6.3-rc1 (Linus Torvalds)

https://lkml.kernel.org/r/CAHk-=wgr1D8hb75Z+nn+4LXUnosp0HM+gP+YJEcEav1DgTC=Cw@mail.gmail.com

After the two weeks of the merge window, first release candidate for v6.3 has released. The merge window was fairly nice and normal, as usual, Linus says.

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 2021-03-06 | ~/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 -rc1 releases in the last two years.