Posts

!! 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....

[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....

[PATCH] zram: correctly handle all next_arg() cases (Sergey Senozhatsky) https://lkml.kernel.org/r/20230103030119.1496358-1-senozhatsky@chromium.org Handle NULL val pointer case from zram’s arguments handling. [RFC PATCH 00/25] Upstream kvx Linux port (Yann Sionneau) https://lkml.kernel.org/r/20230103164359.24347-1-ysionneau@kalray.eu This patchset adds support of Kalray’s kvx family kv3-1 CPU architecture. [PATCH 00/46] Based on latest mm-unstable (85b44c25cd1e). (James Houghton) https://lkml.kernel.org/r/20230105101844.1893104-1-jthoughton@google.com This patchset introduces HugeTLB high-Granularity Mapping (HGM), which teaches HugeTLB how to map HugeTLB pages at high granularity like how THPs PTE-mapped....

As today is the last day of 2022, I checked some open source commits statistics using my simple and buggy script[1], and github. Linux kernel statistics I ran my buggy script[1] to show some 2022 statistics for memory management subsystem and whole tree of Linux kernel as below. Memory Management In 2022, 305 people participated in Linux kernel memory management subsystem development by making 81,631 lines of changes with 2,135 commits....

A summary of DAMON development in 2022 has posted: https://lore.kernel.org/damon/20221229171209.162356-1-sj@kernel.org/ 2022 was a year of active and healthy DAMON development. Seven new DAMON major features were delivered to users. Some of those were featured in articles and academic papers. It was possible thanks to the DAMON community. The community has expanded with its own mailing list and an open bi-weekly chat series. 40 people contributed their great code to DAMON via making their 275 commits merged into the mainline....