Linux Kernel Explores Builder-Style Process Creation

The traditional fork() + exec() model is increasingly a performance bottleneck for modern agentic workloads, and only a clean break from duplicating parent address spaces will solve it.

* Caching metadata is a half-measure: The proposed spawn_template API still relies on the expensive cloning of parent memory mapping metadata.

* Modern workloads drive OS design: The explicit target of coding assistants and agent runtimes shows how new software paradigms are pushing kernel optimization priorities.

* A builder-style process API is the right architecture: Reusing the pidfd abstraction to configure a pristine process mirrors modern kernel design patterns like fsconfig.

* Micro-optimizations fail the cost-benefit test: A 2% speedup is insufficient to justify adding complex, special-purpose system calls to the kernel.