LKML News v5.10-rc1

incoming (Andrew Morton)

https://lkml.kernel.org/r/20201214190237.a17b70ae14f129e2dca3d204@linux-foundation.org

The pull request for v5.11 from Andrew Morton. The mmap_lock tracepoint patchset series is included in here.

incoming (Andrew Morton)

https://lkml.kernel.org/r/20201215123253.954eca9a5ef4c0d52fd381fa@linux-foundation.org

Another pull request from Andrew Morton for memcg scalability improvement. This makes per-memcg lru lock.

[PATCH 00/25] Page folios (Matthew Wilcox)

https://lkml.kernel.org/r/20201216182335.27227-1-willy@infradead.org

This is the patchset for the page folios, which Matthew proposed a few days ago and discussed via zoom.

Do we still need skip swapcache logic in do_swap_page() for SWP_SYNCHRONOUS_IO? (Huang Ying)

https://lkml.kernel.org/r/87y2hxgpo7.fsf@yhuang-dev.intel.com

A commit made swap cache logic for fast swap devices to be skipped, but a later commit uses the swap cache for workingset detection. Huang asks if the skipping is still necessary.

[PATCH v10 00/11] Free some vmemmap pages of HugeTLB page (Muchun Song)

https://lkml.kernel.org/r/20201217121303.13386-1-songmuchun@bytedance.com

This patchset saves memory by freeing some vmemmap pages for hugetlbpage. LWN also covers this: https://lwn.net/Articles/839737/

[PATCH v4 00/10] prohibit pinning pages in ZONE_MOVABLE (Pavel Tatashin)

https://lkml.kernel.org/r/20201217185243.3288048-1-pasha.tatashin@soleen.com

4th version of the patchset for making ZONE_MOVABLE movable.

[RFC v2 PATCH 1/4] mm: make page reporing worker works better for low order page

https://lkml.kernel.org/r/20201221162806.GA22524@open-light-1.localdomain

This commit makes the free page reporting to release the zone lock periodically, to avoid the free page reporting feature holds the lock too long, due to huge number of low-order pages that need to be reported.

[RFC PATCH 0/3] add support for free hugepage reporting

https://lkml.kernel.org/r/20201222074538.GA30029@open-light-1.localdomain

The free pages reporting feature reports only buddy pages, but the hugetlb pages are not buddy pages because those are managed in the reservation scheme. This RFC adds support for reporting of the hugetlb pages.

Linux 5.11-rc1 (Linus Torvalds)

https://lkml.kernel.org/r/CAHk-=wg1+kf1AVzXA-RQX0zjM6t9J2Kay9xyuNqcFHWV-y5ZYw@mail.gmail.com

After two weeks, merge window finished with Christmas and 5.11-rc1 released. Things worked well as expected. Most pull requests received to Torvalds in the first week, so that he could get the holiday week peaceful. The size of the rc1 is not so big, not so little, just as usual.

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 2020-12-28 | ~/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.