LKML News v5.9-rc4

[PATCH v9 0/3] introduce memory hinting API for external process (Minchan Kim)

https://lkml.kernel.org/r/20200901000633.1920247-1-minchan@kernel.org

After the rejection, this patchset posted again. Linus’s opinion about dropping the task_struct to do_madvise and Christian’s comment regarding compat syscall entry has resolved.

And, this patchset merged in the ‘-mm’ tree again. Hopefully it will be merged in mainline by 5.10!

[PATCH v6 0/3] Anonymous VMA naming patches (Sumit Semwal)

https://lkml.kernel.org/r/20200901091901.19779-1-sumit.semwal@linaro.org

This is reposting of old patchset which Colin Cross sent before. Sumit Semwal repost this mainly due to its necessary for Android on mainline kenrnel.

[RFC PATCH 00/16] 1GB THP support on x86_64 (Zi Yan)

https://lkml.kernel.org/r/20200902180628.4052244-1-zi.yan@sent.com

This patchset makes 1GB THP available on x86_64.

[PATCH] mm: workingset: ignore slab memory size when calculating shadows pressure (Roman Gushchin)

https://lkml.kernel.org/r/20200903230055.1245058-1-guro@fb.com

count_shadow_nodes() function returns the memory size for LRU pages and slab. This makes sense in non-memcg case, but in memcg case, this doesn’t make sense as the shadow nodes themselves are backed by slabs. Also, recent commit fb2f2b0adb98 (“mm: memcg/slab: reparent memcg kmem_caches on cgroup removal”) makes the per-lruvec slab counters on non-leaf cgroup inaccurate. For the reason, this commit redefines the count_shadow_nodes() to not count the slab memory.

Linux 5.9-rc4 (Linus Torvalds)

https://lkml.kernel.org/r/CAHk-=wgdq1XfoECVoZyr5+j+LM7oG31DhEhSoju=DQFBdSvEsw@mail.gmail.com

Unlke last week, this week release has unusually many changes. Maybe the changes for last week came this week. Nonetheless, it’s not outlier. Changes are spread well. So, Torvalds says he can’t say it’s calmed down, but also he doesn’t worry about this too much.

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 2018-09-07 | ~/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.