jemalloc 5.4.0 introduces new features like EXTENT_ALLOC_FLAG_PINNED for marking non-reclaimable memory mappings, mallctl stats interfaces for pinned-memory tracking, and per-CPU arena selection resumption. The release also includes over 160 commits focused on technical debt cleanup, bug fixes, test coverage improvements, portability enhancements, and replacing a runtime option with a compile-time one for C++ optimizations.
Background
jemalloc is a general-purpose memory allocator widely used in high-performance applications like PostgreSQL, Firefox, and FreeBSD. Version 5.4.0 continues its trend of improving performance, observability, and portability.
- Source
- Lobsters
- Published
- Sep 18, 2026 at 02:47 AM
- Score
- 6.0 / 10