kernel

LKML News v6.9

[LSF/MM/BPF TOPIC] Locally attached memory tiering (David Rientjes) https://lore.kernel.org/e90dc785-c4e6-47e4-8eda-d35325c82ff9@google.com David suggests a new LSFMM topic for local-attached memory tiering. [LSF/MM/BPF TOPIC] CXL Development Discussions (Adam Manzanares) https://lore.kernel.org/9bf86b97-319f-4f58-b658-1fe3ed0b1993@nmtadam.samsung Adam suggests a new LSFMM topic for general CXL development. kdevops BoF at LSFMM (Luis Chamberlain) https://lore.kernel.org/CAB=NE6XyLS1TaAcgzSWa=1pgezRjFoy8nuVtSWSfB8Qsdsx_xQ@mail.gmail.com Luis suggests to have a time slot for sharing ongoing developments and changes for kdevops, which automates complex kernel development workflows. [RFC PATCH 0/2] introduce budgt control in readahead (Zhaoyang Huang) https://lore.

LKML News v6.9-rc7

[PATCH] thp: Remove HPAGE_PMD_ORDER minimum assertion (Matthew Wilcox) https://lkml.kernel.org/r/20240429190114.3126789-1-willy@infradead.org Willy removes the assumption that THP order is always two or more, since we now handle order-1 folios correctly. [LSF/MM/BPF TOPIC] SLUB: what’s next? (Vlastimil Babka) https://lkml.kernel.org/r/b929d5fb-8e88-4f23-8ec7-6bdaf61f84f9@suse.cz Vlastimil proposes an LSFMM session to retrospect the SLAB deprecation, share ongoing works, and discuss possible future works for reducing similar allocators such as objpool or mempool. [LSF/MM/BPF TOPIC] Maple Tree Proposed Features (Liam R.

LKML News v6.9-rc6

[RFC PATCH 0/5] add mTHP support for anonymous share pages (Baolin Wang) https://lkml.kernel.org/r/cover.1713755580.git.baolin.wang@linux.alibaba.com Baolin adds mTHP support for anonymous shared pages with this RFC patchset. There are some todo items, though. [LSF/MM/BPF TOPIC] SLAB BOF (Matthew Wilcox) https://lkml.kernel.org/r/ZiZy2VVpTQMjN-ko@casper.infradead.org In this mail, Matthew introduces his radical idea around Slab allocator, which decouples the objects from the page and proposes a BoF to discuss it with not only Vlastimil but more audiences.

LKML News v6.9-rc5

[RFC 0/3] Improve memory statistics for virtio balloon (zhenwei pi) https://lkml.kernel.org/r/20240415084113.1203428-1-pizhenwei@bytedance.com This RFC patchset exposes six new VM statistics in the guest to the host via virtio-balloon. The statistics include oom-kill, alloc-stall, scan-async, scan-direct, reclaim-async, and reclaim-direct. [PATCH] Documentation: coding-style: don’t encourage WARN*() (Alex Elder) https://lkml.kernel.org/r/20240414170850.148122-1-elder@linaro.org Due to the panic_on_warn setting, even WARN() and its friends are not that welcomed in multiple situations. Alex posted a patchset to make this point clearer.

LKML News v6.9-rc4

[PATCH v4 0/9] transfer page to folio in KSM (Alex Shi) https://lkml.kernel.org/r/20240409092826.1733637-1-alexs@kernel.org Alex sent the first patchset for making KSM uses folios. [PATCH] tracing: Add new_exec tracepoint (Marco Elver) https://lkml.kernel.org/r/20240408090205.3714934-1-elver@google.com Marco sent a patch for adding a new tracepoint. The tracepoint is for tracing a case where new exec starts while having original state including the mm. Announcing Community Engagement Working Group (Nikolai Kondrashov) https://lkml.kernel.org/r/bf81be70-61ec-4169-b66a-5c3136869107@gmail.com/ KernelCI project announces Community Engagement Working Group which will purpose to connect with kernel maintainers and discuss test quality improvement for their subsystems.

LKML News v6.9-rc3

[PATCH v3 0/7] mm/kvm: Improve parallelism for access bit harvesting (James Houghton) https://lkml.kernel.org/r/20240401232946.1837665-1-jthoughton@google.com James posted the third version of the patchset for adding KVM’s test-and-clear-access-bits fast path that doesn’t take mmu_lock. It is RFC because the author wants to do more performance tests, and unusre if the arm64 part is correct. [PATCH] mm, mmap: remove vma_merge() (Vlastimil Babka) https://lkml.kernel.org/r/20240401192623.18575-2-vbabka@suse.cz After the successful removal of SLAB, Vlastimil suggests to remove vma_merge(). But the patch has sent on 2024-04-01 :)

LKML News v6.9-rc2

[PATCH 0/2] support multi-size THP numa balancing (Baolin Wang) https://lkml.kernel.org/r/cover.1711453317.git.baolin.wang@linux.alibaba.com Baolin posted a patchset for making NUMA balancing algorithm for multi-sized THP (mTHP) to follow the THP strategy as the basic support. [PATCH v2 0/6] Improve visibility of writeback (Kemeng Shi) https://lkml.kernel.org/r/20240327155751.3536-1-shikemeng@huaweicloud.com Kemeng posted a patchset that adds two new debugfs file, bdi/xxx/stats and bdi/xxx/wb_stats to show whole bdi and per-wb writeback information. [PATCH v10] zswap: replace RB tree with xarray (Chris Li) https://lkml.

LKML News v6.9-rc1

[GIT PULL] slab updates for 6.9 (Vlastimil Babka) https://lkml.kernel.org/r/c021631d-29e5-432f-bfcd-1d75ec28d065@suse.cz Vlastimil sent the slab pull request for 6.9 to Linus Torvalds. [PATCH v4 0/6] Swap-out mTHP without splitting (Ryan Roberts) https://lkml.kernel.org/r/20240311150058.1122862-1-ryan.roberts@arm.com Ryan sent the fourth version of the patchset to swap-out multi-sized THP without splitting first. The approach is similar to that for PMD-sized THP. [PATCH] vmstat: Keep count of the maximum page reached by the kernel stack (Pasha Tatashin) https://lkml.kernel.org/r/20240313033417.447216-1-pasha.tatashin@soleen.com

LKML News v6.8

[RFC 01/16] mm/hmm: let users to tag specific PFNs (Leon Romanovksy) https://lkml.kernel.org/r/a77609c9c9a09214e38b04133e44eee67fe50ab0.1709631413.git.leon@kernel.org This RFC patchset introduces new flag that allows users to tag specific PFNs with extra data. [PATCH V3 01/10] mm: page_alloc: freelist migratetype hygiene (Johannes Weiner) https://lkml.kernel.org/r/20240306041526.892167-1-hannes@cmpxchg.org Whne pages of one migratetype end up on the freelists on another type, migratetype violations happen. This third version of patchset fixes it. [PATCH 0/8] tracing: Persistent traces across a reboot or crash (Steven Rostedt) https://lkml.

LKML News v6.8-rc7

[PATCH 1/1] mm/madvise: enhance lazyfreeing with mTHP in madvise_free (Lance Yang) https://lkml.kernel.org/r/20240225123215.86503-1-ioworker0@gmail.com Lance improves madvise_free_pte_range() to handle large folios that smaller than PMD-size and optimizes lazy-free of PTE-mapped smaller than PMD-size THPs using this patch. [RFC PATCH] mm: Add reclaim type to memory.reclaim (Yafang Shao) https://lkml.kernel.org/r/20240225114204.50459-1-laoar.shao@gmail.com This RFC patch extends memory.reclaim memcg file to receive type of memory to reclaim. It supports pagecache only, slabs only, and both. [LSF/MM/BPF TOPIC] mm/mempolicy extentions for heterogeneous memory systems (Gregory Price) https://lkml.