Improving Kexec Boot Time for Server Configurations

Explore strategies for significantly reducing kernel boot times in server configurations by up to 80%. Learn about parallelizing smpboot, optimizing TSC synchronization, and streamlining the initialization of struct pages when using HugeTLB Vmemmap Optimization (HVO). Discover optimizations for specialized scenarios, such as skipping PCI probe for certain devices and bypassing purgatory. Examine remaining areas that still occupy significant boot time in the optimized kernel, including enabling ACPI interpreter and ACPI table loads, and discuss potential optimization techniques. Gain insights into maintaining an up-to-date host kernel while minimizing downtime for guest Virtual Machines (VMs) during live updates.