LKML News v6.9-rc6

[RFC PATCH 0/5] add mTHP support for anonymous share pages (Baolin Wang)

https://lkml.kernel.org/r/cover.1713755580.git.baolin.wang@linux.alibaba.com

Baolin adds mTHP support for anonymous shared pages with this RFC patchset. There are some todo items, though.

[LSF/MM/BPF TOPIC] SLAB BOF (Matthew Wilcox)

https://lkml.kernel.org/r/ZiZy2VVpTQMjN-ko@casper.infradead.org

In this mail, Matthew introduces his radical idea around Slab allocator, which decouples the objects from the page and proposes a BoF to discuss it with not only Vlastimil but more audiences.

[PATCH v14 00/22] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support (Michael Roth)

https://lkml.kernel.org/r/20240421180122.1650812-1-michael.roth@amd.com

Michael posted the fourteenth version of the SEV-SNP hypervisor support patchset.

[PATCH 0/2] mm: introduce per-order mTHP split counters (Lance Yang)

https://lkml.kernel.org/r/20240424135148.30422-1-ioworker0@gmail.com

THP split statistics is not including PTE-mappted mTHP. This patchset hence introduces per-ordr mTHP split counters.

[PATCH 0/4] Improve anon_vma scalability for anon VMAs (Matthew Wilcox)

https://lkml.kernel.org/r/20240426144506.1290619-1-willy@infradead.org

Matthew posted a patchset that improving throuput by delaying mmap_lock taking until it actually need it for assigning an anon_vma to the vma. According to the Intel’s kernel test robot, it makes 3x throughput improvement. Specifically, the test case was vm-scalability.

[PATCH v2 0/7] memcg: reduce memory consumption by memcg stats (Shakeel Butt)

https://lkml.kernel.org/r/20240427003733.3898961-1-shakeel.butt@linux.dev

Memcg stats are maintained per-cpu and numa specific stats, and therefore the memory overhead increases on large machines having many CPUs and NUMA nodes. Shakeel posted a patchset to reduce the overhead by avoid allocating the memory for non-memcg specific stats.

Linux 6.9-rc6 (Linus Torvalds)

https://lkml.kernel.org/r/CAHk-=witYatGg+jW1kVu2Moq6yF2JNFe3wn7G0sMNhE=H=9voA@mail.gmail.com

The sixth candidate for Linux v6.9 is out. Linus says everything is normal and only documentation update diffstat is stading out, which is again not a problem.

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/lazybox using below command:

$ relstat.py --since 2022-04-29 | ~/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.