Heterogeneous chip multiprocessors

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Amdahl's Law in the Multicore Era (2008, background): “An alternative to a symmetric multicore chip is an asymmetric (or heterogeneous) multicore chip where one or more cores are more powerful than the others [3, 8, 9, 10, 14].”
Accelerating critical section execution with asymmetric multi-core architectures (2009, background): “Critical sections are different from Amdahl s serial bottleneck: during the execution of a critical section, other threads that do not need to execute the same critical section can make progress.”
Scaling the bandwidth wall: challenges in and avenues for CMP scaling (2009, methodology): “We use chip size estimates from prior work [15, 16] which shows that simpler smaller cores can be up to 80× smaller.”
Qilin: Exploiting parallelism on heterogeneous multiprocessors with adaptive mapping (2009, background): “By providing processing elements (PEs)1 of different performance/energy characteristics on the same machine, these architectures could deliver high performance and energy efficiency [14].”