linux

LKML News v6.12-rc3

[RFC PATCH v3 0/4] sched+mm: Track lazy active mm existence with hazard pointers (Mathew Desnoyers) https://lore.kernel.org/20241008135034.1982519-1-mathieu.desnoyers@efficios.com Mathiew Desnoyers posted the third version of his hazard pointer patch series for optimizing active_mm tracking following comments from Peter Zijlstra and Paul E. McKenney on the previous versions of the patch series. [RFC PATCH 0/1] Buddy allocator like folio split (Zi Yan) https://lore.kernel.org/20241008223748.555845-1-ziy@nvidia.com Zi Yan posted an RFC patch for making folio split behaves like the Buddy allocator, to reduce total number of folios after splits.

LKML News v6.12-rc2

[PATCH v2 1/2] virt: pvmemcontrol: control guest physical memory properties (Yuanchu Xie) https://lore.kernel.org/20241001011328.2806686-1-yuanchu@google.com Yuanchu posted the second version of a patch series for pvmemcontrol, which allows VM guests control their physcial memory properties and enable security features optimizations. [Invitation] Linux MM Alignment Session on shared PTEs across processes on Wednesday (David Rientjes) https://lore.kernel.org/eb2ce2c1-9fbd-215b-9973-7ec515c14015@google.com Dadiv shares next Linux MM alignment session will be held this Wednesday. The topic will be “Add support for shared PTEs across processes”, aka mshare().

LKML News v6.11

[PATCH hotfix 6.11] minmax: reduce egregious min/max macro expansion (Lorenzo Stoakes) https://lore.kernel.org/20240911153457.1005227-1-lorenzo.stoakes@oracle.com Lorenzo sent a patch for resolving min()/max() expansions causing kernel build time issue by fixing a few known-bad cases of nested macro usages. [RFC PATCH 0/7] support for mm-local memory allocations and use it (Fares Mehanna) https://lore.kernel.org/20240911143421.85612-1-faresx@amazon.de Fares posted an RFC patch series for mm-local memory allocations for pushing those out of rach for possible speculation based cross-process attacks.

LKML News v6.11-rc7

[PATCH 00/15] timers: Cleanup delay/sleep related mess (Anna-Maria Behnsen) https://lore.kernel.org/20240904-devel-anna-maria-b4-timers-flseep-v1-0-e98760256370@linutronix.de A discussion started from a question about acpi_os_sleep() concluded the documentation is outdated, and same for some code for the same reason. This patchset tries to update the documents and code. [PATCH 0/2 v2] remove PF_MEMALLOC_NORECLAIM (Michal Hocko) https://lore.kernel.org/20240902095203.1559361-1-mhocko@kernel.org Michal sent the second revision of PF_MEMALLOC_NORECLAIM removal patchset with Reviewed-by: tags in a more formal version. [GIT PULL] hotfixes for 6.

LKML News v6.12-rc1

[GIT PULL] slab updates for 6.11 (Vlastimil Babka) https://lore.kernel.org/8d6c5d10-5750-4472-858c-eadc105453be@suse.cz Vlastimil sent the slab pull request for Linux 6.12-rc1. Apparently the title is a typo. [RFC PATCH 0/4] Add hazard pointers to kernel (Boqun Feng) https://lore.kernel.org/20240917143402.930114-1-boqun.feng@gmail.com Boqun posted a patch series for introducing hazard pointers for kernel space, which is “a scalable reference counting mechanism with RCU-like API”. [GIT PULL] hotfixes for 6.12-rc1 (Andrew Morton) https://lore.kernel.org/20240919003557.1777673c0f759f9e4ebaa328@linux-foundation.org Andrew sent a hotfixes pull request for 6.

LKML News v6.11-rc6

[RFC PATCH -next 0/3] fs: Introduce the scope-based resource management for folio_lock/unlock (Li Zetao) https://lore.kernel.org/20240826071036.2445717-1-lizetao1@huawei.com Li proposes scope-based resource management for folio locking. [PATCH 0/2] get rid of PF_MEMALLOC_NORECLAIM (Michal Hocko) https://lore.kernel.org/20240826085347.1152675-1-mhocko@kernel.org Michal argues PF_MEMALLOC_NORECLAIM has merged even though MM people pushed it back, and attempts to get rid of it by updating its users to use explicit GFP_NOWAIT allocation context. [PATCH] bcachefs: Switch to memalloc_flags_do() for vmalloc allocations (Kent Overstreet) https://lore.

LKML News v6.11-rc5

[PATCH v4 0/6] mm: split underused THPs (Usama Arif) https://lore.kernel.org/20240819023145.2415299-1-usamaarif642@gmail.com Yusama posted the fourth version of the patch series for splitting underutilized THPs for keeping THP performance gain while reducing the huge page internal fragmentation-cuased memory usage bloat. [PATCH 0/5] page allocation tag compression (Suren Baghdasaryan) https://lore.kernel.org/20240819151512.2363698-1-surenb@google.com Suren sent a patch series for improving page allocation tagging. [PATCH 0/4] Increase the number of bits available in page_type (Matthew Wilcox) https://lore.kernel.org/20240821173914.2270383-1-willy@infradead.org

LKML News v6.11-rc4

[PATCH v3 0/6] mm: split underutilized THPs (Usama Arif) https://lore.kernel.org/20240813120328.1275952-1-usamaarif642@gmail.com Usama posted the third version of THP split patch series. [PATCH] Reenable NUMA policy support in the slab allocator (Christoph Lameter) https://lore.kernel.org/20240812-numa_policy-v1-1-1732602b976c@gentwo.org Christoph sent a patch that reverts previous commit that disabled the numa policy support in the slab allocator. [RFC PATCH v1 0/4] mm: ZSWAP swap-out of mTHP folios (Kanchan P Sridhar) https://lore.kernel.org/20240814062830.26833-1-kanchana.p.sridhar@intel.com Kanchan sent an RFC patch series for enabling zswap_store() storing mTHP folios.

LKML News v6.11-rc3

[PATCH 00/10] mm: remove vma_merge() (Lorenzo Stoakes) https://lore.kernel.org/cover.1722849859.git.lorenzo.stoakes@oracle.com Lorenzo posted a patchset for removing the infamous vma_merge(), which caused too much complexity, and the prior attempt remove it was failed. [RFC PATCH 0/4] mm/arm64: re-enable HVO (Yu Zhao) https://lore.kernel.org/20240806022114.3320543-1-yuzhao@google.com Yu sent an RFC patchset for re-enabling HugeTLB Vmemmap Optimization on arm64. [PATCH 00/10] Introduce guestmemfs: persistent in-memory filesystem (James Gowans) https://lore.kernel.org/20240805093245.889357-1-jgowans@amazon.com James Gowans posted a patch series for a new in-memory filesystem that designed for live update.

LKML News v6.11-rc2

[RFC 0/2] mm: introduce THP deferred setting (Nico Pache) https://lore.kernel.org/20240729222727.64319-1-npache@redhat.com Nico found increased memory footprint from THP after their customers switching from RHEL7 to RHEL8. To mitigate the issue, Nico is proposing adding a new THP configuration called deferred. It is same to madvise but allows khugepaged to do the work. [PATCH v2 0/4] mm: clarify nofail memory allocation (Barry Song) https://lore.kernel.org/20240731000155.109583-1-21cnbao@gmail.com Barry posted the second version of their patchset for __GFP_NOFAIL clarification.