ELC + ABS

People expect their embedded devices to turn on and be available without long delays. Unoptimized Linux can take as long as 30 seconds to the point where the device is operational. This talk shows how to use open source tracing and profiling tools to find the sources of boot delays and help to minimize boot time.

The focus of this talk will be on early system bringup, but the tools and techniques used are applicableto all phases of system operation. Measurement of early system bringup has to  deal with a number of unique issues as compared to normal system profiling, due to the nature of the process and the lack of infrastructure in the early stages. Techniques will be demonstrated for optimizing the four main stages of system bringup, namely bootloader, kernel, init, and critical applications.