LKML NEws v5.12-rc8

[PATCH v2 0/5] mm/memcg: Reduce kmemcache memory accounting overhead (Waiman Long)

https://lkml.kernel.org/r/20210412225503.15119-1-longman@redhat.com

Recently introduced new slab memory controller eliminates the need for separate kmemcaches for each memory cgroup and therefore reduce kernel memory usage. However, it also increases memory accouning overhead in kmem cache alloc and free functions. This patchset reduces unnecessary local_irq_save() and local_irq_restore() sequences in the code path as much as possible for minimal overhead.

[PATCH v7 0/7] Make alloc_contig_range handle Hugetlb pages (Oscar Salvador)

https://lkml.kernel.org/r/20210413104747.12177-1-osalvador@suse.de

This patchset makes Hugetlb pages to be able to be allocated via alloc_contig_range(), which is also used by CMA.

[RFC] mm: support multi_freearea to the reduction of external fragmentation (lipeifeng)

https://lkml.kernel.org/r/20210414023803.937-1-lipeifeng@oppo.com

This patch sorts sorts the free pages in buddy so that low-order pages allocation done in the front area of memory while the high-order pages allocation done in the back area of memory. As a result, the high-order pages allocation could success more easily.

[PATCH v8 0/7] Make alloc_contig_range handle Hugetlb pages (Oscar Salvador)

https://lkml.kernel.org/r/20210415103544.6791-1-osalvador@suse.de

New version of the patchset. Collected ‘Reviewed-by’s and ‘Acked-by’s.

[PATCH 00/13] [RFC] Rust support (Miguel Ojeda)

https://lore.kernel.org/lkml/20210414184604.23473-1-ojeda@kernel.org/

This is the RFC for Rust support in Linux build system.

[PATCH 1/2] mm/vmscan: add sync_shrinkers function (Christian Koenig)

https://lkml.kernel.org/r/20210415115624.2904-1-christian.koenig@amd.com

This patchset adds a new function sync_shrinkers(), which prevents a race between, for example, shrinkers trying to free pages and hotplug trying to remove the device which having the pages.

[PATCH v2] mm/compaction:let proactive compaction order configurable (chukaiping)

https://lkml.kernel.org/r/1618593751-32148-1-git-send-email-chukaiping@baidu.com

The proactive compaction has fixed value ‘9’ for COMPACTION_HPAGE_ORDER. This doesn’t make sense for machines having less than 9 max order of free pages, because it would trigger compactions too frequently. For example, machines configured with 1GB hugetlbfs huge pages. This patch exports the order to procfs so that admins could configure it.

Linux 5.12-rc8 (Linus Torvalds)

https://lkml.kernel.org/r/CAHk-=wjgVFDhX60fxwDobHoqJvVkuxf=JgSTtGnGMa5r-1u4Yw@mail.gmail.com

The last week was calm, but not calm enough to avoid rc8 release. This is fifth rc8 release for 5.x series.

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 2019-04-19 | ~/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 -rc5 releases in the last two years.