Kernel

[RFC PATCH 00/19] mm: Introduce a cgroup to limit the amount of locked and pinned memory (Alistair Popple) https://lkml.kernel.org/r/cover.f52b9eb2792bccb8a9ecd6bc95055705cfe2ae03.1674538665.git-series.apopple@nvidia.com This RFC patchset introduces a cgroup limit like RLIMIT_MEMLOCKED but that for pinned pages. [RFC PATCH 0/4] Fix excessive CPU usage during compaction (Mel Gorman) https://lkml.kernel.org/r/20230125134434.18017-1-mgorman@techsingularity.net A patch for not ignoring fast_find_migrateblock() found pageblocks made compaction shows high CPU and stalls. It therefore once merged in mainline, than reverted, and again merged in mm-unstable....

[RFC] memory pressure detection in VMs using PSI mechanism for dynamically inflating/deflating VM memory (Sudarshan Rajagopalan) https://lkml.kernel.org/r/DS0PR02MB90787835F5B9CB9771A20329C4C09@DS0PR02MB9078.namprd02.prod.outlook.com Qualcomm’s Linux memory team asks upstream’s opinion about their userspace deamon approach for controlling VM memory size based on memory demands via monitoring PSI. [PATCH v1 0/3] Introduce per NUMA node memory error statistics (Jiaqi Yan) https://lkml.kernel.org/r/20230116193902.1315236-1-jiaqiyan@google.com On huge memory systems, memory error is inevitable, so detailed statistics of it helps administrators to operate systems more efficiently....

!! NOTE !! This post has migrated to https://damonitor.github.io/posts/damon_evaluation. This out-dated post will be removed soon. DAMON is lightweight. It increases system memory usage by 0.39% and slows target workloads down by 1.16%. DAMON is accurate and useful for memory management optimizations. An experimental DAMON-based operation scheme for THP, namely ’ethp’, removes 76.15% of THP memory overheads while preserving 51.25% of THP speedup. Another experimental DAMON-based ‘proactive reclamation’ implementation, namely ‘prcl’, reduces 93....

DAMON is lightweight. It increases system memory usage by 0.39% and slows target workloads down by 1.16%. DAMON is accurate and useful for memory management optimizations. An experimental DAMON-based operation scheme for THP, namely ’ethp’, removes 76.15% of THP memory overheads while preserving 51.25% of THP speedup. Another experimental DAMON-based ‘proactive reclamation’ implementation, namely ‘prcl’, reduces 93.38% of residential sets and 23.63% of system memory footprint while incurring only 1.22% runtime overhead in the best case (parsec3/freqmine)....

[PATCH 00/41] Per-VMA locks (Suren Baghdasaryan) https://lkml.kernel.org/r/20230109205336.3665937-1-surenb@google.com For the mmap_lock scalability issue, yet another approach called per-VMA locks has posted. [PATCH v2 0/2] docs/mm: start filling out new structure (Mike Rapoport) https://lkml.kernel.org/r/20230110152358.2641910-1-rppt@kernel.org MM kernel documentation has restructured to be somewhat more like textbook that can better explaining overall concept and how it manage memory, but the content is empty. Mike starts filling the content. LSFMMBPF proposal [General/MM]: SRCU: a case study in memory ordering (Joel Fernandes) https://lkml....