The Exynos 5 Octa, the very first commercial SoC using ARM‘s big.LITTLE cluster technology has been given a demonstration of how it should internally work.
As mentioned earlier the Exynos 5 Octa is the next generation of Exynos SoCs developed by Samsung, the chip uses 2 pairs of clusters each packing 4 cores. A first cluster features four low power Cortex-A7 cores while the other has four more robust Cortex-A15 cores designed for maximum performance. The video does not explicitly mention the Exynos 5 Octa but rather the general nuts and bolts of a traditional SoC using the big.LITTLE cluster technology.
The video starts with a basic self explanatory introduction then goes onto the cluster modes, switching technology and it’s scheduler interoperability with the system kernel especially Linux. This article explains it all.
The chip is essentially focused at maintaining a level of balance between performance and energy efficiency, that is done by switching between clusters depending on the system load.
The scaling capabilities were also mentioned, it should be noted that the four Cortex-A7 cores are designed to process low-activity tasks such as basic User-UI interaction while minimizing power consumption at all costs. Roughly speaking the beefier Cortex-A15 clusters will only be used whenever more horsepower is being requested.