Linux 7.4 makes workqueue flushes 10 to 100 times faster on big servers

On October 22, 2026, a Tejun Heo optimization merged into Linux 7.4 lifts an idle workqueue flush from 40,000 to 4.2 million operations per second on a 192-CPU machine. If you run high-core-count servers, this release hands you a measurable latency win with zero configuration.