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An external debugger would need to clean the contents of the processor data cache in which of the following cases?
In an ARMv7-A system, the following C function calculates a simple checksum for an input data packet of variable length. The checksum is defined to be the sum of all of the 16-bit data items in the packet modulo 65536. The parameter data_items contains the number of 2-byte data items in the packet, and it cannot be zero by design.

When using an ARM compiler, which TWO of the following optimizations could improve the performance of this code? (Choose two)
Which events would be counted using the Performance Monitoring Unit (PMU) in order to measure the data cache efficiency of an application?