mmotm 2021-11-29-18-58 uploaded (Andrew Morton)
https://lkml.kernel.org/r/20211130025839.ZhVoO1W_7%akpm@linux-foundation.org
mmotm has updated. It’s based on v5.16-rc3, adds 52 new patches, modifies 18 existing patches, and drops 2 patches. In total, 224 patches in the queue.
[QUESTION] “place pages to tail” regress memory read bandwidth about 10% under our test cases (liupeng)
https://lkml.kernel.org/r/3c6349ddd9a34732a251467b7fa4fe93@huawei.com
Liu Peng found David’s patch 7fef431be9c9(mm/page_alloc: place pages to tail in
__free_pages_core()) incurring performance regression, and asking some
suggestions.
[RFC PATCH] mm: count zram read/write into PSI_IO_WAIT (Huangzhaoyang)
https://lkml.kernel.org/r/1638356341-17014-1-git-send-email-huangzhaoyang@gmail.com
This RFC patch adds zram reads/writes counts in PSI_IO_WAIT.
[PATCH v4 00/66] Introducing the Maple Tree (Liam Howlett)
https://lkml.kernel.org/r/20211201142918.921493-1-Liam.Howlett@oracle.com
Fourth version of the maple tree, which is another tree-based structure. The authors believe this could be used instead of rbtree for many cases including the VMAs management. Compared to the previous version, several features are added and the iteration part has 40% faster.
[RFD] clear virtual machine memory when virtual machine is turned off (Fei Luo)
https://lkml.kernel.org/r/CAMgLiBskDz7XW9-0=azOgVJ00t8zFOXjdGaH7NLpKDfNH9wsGQ@mail.gmail.com
Memory for a KVM process would contain sensitive data of the virtual machine. Even though the virtual machine is turned off, the memory will contain the data for a long time, unless be reused by other processes. This mail proposes clearing the memory even before the memory is reused by other processes.
mmotm 2021-12-02-17-04 uploaded (Andrew Morton)
https://lkml.kernel.org/r/20211203010516.HJH82Eku8%akpm@linux-foundation.org
MMOTM has uploaded. It’s now based on v5.16-rc3. This time it adds 33 new patches, modifies 55 pre-existing patches, and drops 2 patches. In total, 255 patches are in the queue.
[PATCH linux-next] delayacct: track delays from memory compact (wangyong)
https://lkml.kernel.org/r/1638542272-15187-1-git-send-email-wang.yong12@zte.com.cn
Linux kernel allows user space to know from where and how long delays have made. The tracking targets include CPU, IO, SWAP, RECLAIM, and THRASHING. This commit adds delays due to COMPACT there.
[PATCH v2 0/4] page table check (Pasha Tatashin)
https://lkml.kernel.org/r/20211204182314.1470076-1-pasha.tatashin@soleen.com
This patchset ensure page tables are correct by doing page->_refcount check.
This version fixes some bugs and support loadable modules.
Linux 5.16-rc4 (Linus Torvalds)
https://lkml.kernel.org/r/CAHk-=wguTgfhqftuf6FnW-KZ7zhQGDNktr_POKUkJ6SuMeQuWQ@mail.gmail.com
Normal, fairly small fourth release candidate for v5.16.
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 2019-12-06 | ~/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.
