Two optimizations merged into the Linux 7.3 merge window cut memory-management lock contention: the worst-case anon_vma lock hold time drops from 705 ms to 1.67 ms, and the zsmalloc path speeds up by as much as 1.83× on modest hardware. Teams running JVMs, databases or KSM under memory pressure get a direct latency win just from upgrading.

Linux 7.3’s merge window opened in mid-August 2026 with 1,250 memory-management patches, a feature-complete sched_ext and initial support for AMD UALink and the Apple M3. Admins under memory pressure have two concrete fixes — rmap_walk_ksm and zsmalloc — to plan for before the expected October 2026 release.