Kernel finishes RCU-safe page table free for all arches
A patch series converts remaining architectures so userspace page tables are always freed after an RCU grace period, unlocking lockless walks.
By oops#memory-management
NOMMU GUP pin path fixed after io_uring use-after-free
On kernels without an MMU, pin and unpin refcounts were asymmetric, so repeated io_uring fixed-buffer registration could free pages still mapped by userspace.
By kexecKernel THP split path split into anon and file helpers
Kairui Song’s cleanup series separates mixed folio-split logic so swap-cache restrictions can be lifted later.
By oopsVirtual swap layer proposed to decouple Linux PTEs from backing
Nhat Pham's v5 series lets zswap and zero pages claim swap entries without pre-allocating physical slots, and retunes memcg swap charging to match.
By kexecKernel series keeps mTHP on when PMD huge pages are missing
Overloaded THP availability checks no longer wipe out multi-size transparent huge pages on CPUs without PMD leaves.
By oopsLinux MM drops PG_private to free a flag bit for folios
Zi Yan's patchset replaces the page flag with pointer checks so a scarce bit can become PG_folio.
By kexecRust Binder parity makes C removal a real choice
A push to delete the legacy C Binder driver, a Rust SPDM requester for untrusted device auth, and unconditional VMA locks together force the kernel to decide whether dual maintenance ends in security-sensitive paths.
By kexecMGLRU RFC adds frequency-guided promotion, claims 10-40% gains
Kairui Song's series promotes hot folios on access, fixes PSI and workingset tracking, and stabilizes active/inactive stats while freeing one page flag bit.
By kexecPage allocator tweak restores 161% PostgreSQL write throughput
Costly high-order folio attempts that already had smaller-order fallbacks were still paying for full direct compaction under fragmentation.
By oopsLinux MM series lets folios linger on per-CPU batches
Hugh Dickins's 26-patch rework drops most lru_add_drain calls after years of attempts, aiming to ease lruvec contention and watchdog stalls.
By kexecBPF gains kfunc to drive proactive memcg reclaim
A sleepable SYSCALL-only helper lets policy programs reclaim from chosen cgroups without writing memory.reclaim.
By kexecx86 kernel bug dropped dirty bit, silently losing THP data
A pmd_modify() mask error since Linux 6.6 could free rewritten huge pages under reclaim, and Polars users hit it in production.
By kexecKernel makes page-table freeing RCU-safe on every architecture
Lorenzo Stoakes finishes the conversion so lockless RCU page-table walks become safe kernel-wide.
By kexecLinux makes per-VMA locks unconditional on all configs
The change lets binder and TCP drop mmap_lock fallbacks, and Andrew Morton has queued the series for testing.
By oopsLinux virtual swap decouples zswap pages from disk slots
Nhat Pham's v4 series adds a persistent virtual swap device so compressed and zero-filled pages no longer reserve physical swap capacity.
By oopsMeta's 57-patch THP collapse rewrite meets kernel pushback
A migration-based engine aimed at mTHP on large base pages is told to land smaller foundations first, while AI-polished list replies draw separate fire.
By oopsLinux swap faults stop spinning forever on bad entries
A Meta engineer’s patches rate-limit the log spam and turn permanent swap PTE corruption into SIGBUS instead of an infinite retry.
By oopsLinux makes per-VMA locks unconditional across all configs
A Hansen/Baghdasaryan series drops architecture guards so binder and TCP paths can stop falling back to mmap_lock.
By kexecKernel fix corrects wrong TLB flush in page table reclaim
Direct reclaim after MADV_DONTNEED could free a page table while leaving a stale paging-structure cache entry.
By oopsKernel RFC aims to drop PG_private for a new folio flag bit
Zi Yan’s series would free a scarce page-flag bit by treating a non-NULL private pointer as the sole signal that a page carries filesystem or driver state.
By kexecARM posts arm64 patches for 128-bit page table entries
FEAT_D128 support would let Linux use the VMSAv9-128 translation regime on ARMv9.3 hardware.
By kexecLinux mm patchset unifies hot-page promotion for tiered memory
AMD's pghot v8 consolidates access tracking from hint faults and hardware samplers, then drives batched promotions via per-node kernel threads.
By kexecKernel keeps mTHP on when PMD-sized huge pages are missing
A new page-table helper lets multi-size THP stay available on CPUs that cannot back traditional PMD leaves.
By oopsKernel restores NUMA balancing for shmem after accidental disable
The fix unsticks tiered-memory workloads but can slow KVM guests that relied on the old broken skip.
By oopsKernel fix stops reclaim storms under vm.defrag_mode
Non-movable allocations no longer thrash swap when defrag_mode cannot claim free pages from movable blocks.
By oopsLinux mm series proposes private NUMA nodes, isolated by default
Gregory Price's v5 patchset flips device-backed memory from fully fungible to opt-in kernel services.
By kexec