LKML News v6.6-rc4

[PATCH v3 0/4] Smart scanning mode for KSM (Stefan Roesch)

https://lkml.kernel.org/r/20230926040939.516161-1-shr@devkernel.io

KSM scans pages without historic information, so pages that already found to be not eligible for deduplication are scanned unnecessarily. This patchset introduces smart scanning for KSM, which utilizes the historic information.

[PATCH -V2 00/10] mm: PCP high auto-tuning (Huang Ying)

https://lkml.kernel.org/r/20230926060911.266511-1-ying.huang@intel.com

This patchset implements auto-tuning of Per-CPU Pageset high to optimize page allocation performance.

[PATCH rfc 0/5] mm: improve performance of kernel memory accounting (Roman Gushchin)

https://lkml.kernel.org/r/20230927150832.335132-1-roman.gushchin@linux.dev

This RFC patchset reduces the kernel memory accounting overhead by removing unnecessary memcg->objcg conversions and use scope-based protection of objcgs. According to the author’s microbenchmark, the overhead has reduced by about 30 %.

[GIT PULL] slab fixes for 6.6-rc4 (Vlastimil Babka)

https://lkml.kernel.org/r/70699482-f413-d7b8-6378-48bc915d1ecb@suse.cz

Vlastimil sent a slab fixes pull request to Linus Torvalds.

[GIT PULL] hotfixes for 6.6-rc4 (Andrew Morton)

https://lkml.kernel.org/r/20231001083937.5f401972d99dc3168e6d4218@linux-foundation.org

Andrew sent hotfixes for mm and non-mm to Linus Torvalds.

Linux 6.6-rc4 (Linus Torvalds)

https://lkml.kernel.org/r/CAHk-=wia2-4DRvD-aXz70AV64yrt+Vr50MxHiDunZ71dHATv-Q@mail.gmail.com

This time, there was no networking pull for rc4, which made it samller than usual. Maybe due to the fact that netconf being held last week? Other than that, all looks normal.

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 2021-10-02 | ~/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.