LKML News v6.6-rc2

[syzbot] Monthly mm report (Sep 2023)

https://lkml.kernel.org/r/000000000000c06b600605127cb3@google.com

Syzbot posted its mm subsystem report for last 31 days. For the period, seven new issues were found and two among those were fixed. In total, 43/232 issues are still open.

[PATCH 0/2] workload-specific and memory pressure-driven zswap writeback (Nhat Pham)

https://lkml.kernel.org/r/20230911164024.2541401-1-nphamcs@gmail.com

Zswap has only single LRU list and shrinks under user-defined limit. This patch series seperates the LRU list out to per-memcg and per-NUMA, and perform workload-specific writeback under memory pressure.

[PATCH 0/3] memcg: more sophisticated stats flushing (Yosry Ahmed)

https://lkml.kernel.org/r/20230913073846.1528938-1-yosryahmed@google.com

Current memcg stat flushing works in single flusher, so having good efficiency but bad accuracy interms of freshness. This patchset provides a better tradeoff between the accuracy and the performance.

[PATCH 0/3] userfaultfd remap option (Suren Baghdasaryan)

https://lkml.kernel.org/r/20230914152620.2743033-1-surenb@google.com

This patchset introduces a new feature for userfaultfd, namely UFFDIO_REMAP, which was maintained by Andrea in his local tree for long time.

[RFC PATCH 00/14] Prevent cross-cache attacks in the SLUB allocator (Matteo Rizzo)

https://lkml.kernel.org/r/20230915105933.495735-1-matteorizzo@google.com

Cross-cache attack is making SLUB returns the page containing a victim object to the page allocator and then make it uses the same page for different slab cache or other objects. This patchset prevents it by making sure a virtual address that used for a slab cache isn’t reused for anything except other slabs in that cache.

Linux 6.6-rc2 (Linus Torvalds)

https://lkml.kernel.org/r/CAHk-=whW=fV2tnAreSbtPVpJxq++pyBZa3g+cxX8_V__WSZzCg@mail.gmail.com

Exactly after 32 years from the Linux 0.01 release, Linus Torvalds released v6.6-rc2 of Linux. Other than the random date thing, nothing special changes but usual rc2 fixes spareading over.

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 2021-09-17 | ~/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 -rc2 releases in the last two years.