Linux kernel 7.0-rc removes PREEMPT_NONE, causing a ~49% PostgreSQL throughput regression. The scheduler maintainer refuses to revert the change, demanding PostgreSQL adopt the new RSEQ timeslice extension instead. Ubuntu 26.04 LTS ships with this kernel.
Alibaba open-sourced AliSQL 8.0, which combines MySQL-compatible OLTP, DuckDB-based high-speed OLAP, and HNSW vector search into a single database. This article considers what that means amid MySQL stagnation and PostgreSQL's momentum.
