Samsung Announces big.LITTLE MP Support in Exynos 5420

It hasn't been much of a secret in the SoC space that big.LITTLE on the original Exynos 5 Octa (5410) didn't end up working in the most optimal fashion. Instead of using core migration or the Heterogeneous Multi-Processing (HMP) big.LITTLE models, the 5410 instead used cluster migration which meant either all 4 ARM Cortex A15s or 4 ARM Cortex A7s were lit up.

For those not familiar, there are three big.LITTLE models, core switching, in which any of the A7 and A15 cores can be swapped, cluster switching, in which either all A7s or all A15s can be swapped, or HMP, where the kernel is aware of all cores and can schedule threads to any of the cores all at once. This final model is coming to Exynos 5420 by the end of Q4 2013 and will be available to partners shipping product based on its reference platform.

http://www.anandtech.com/show/7313/samsung-announces-biglittle-mp-support-in-exynos-5420