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2025-05-15benchtest: malloc tcache hotpath benchtestCupertino Miranda1-0/+22
Existing benchtests for malloc infrastructure seem to be rather generic to test global malloc implementation performance. This new benchtest focus on reducing any non tcache related side effects, allowing to more realistically predict performance impacts of tcache code changes. The test was inpired in bench-[cm]alloc-thread code, with severe simplifications: - forces single thread execution, reducing concurrency side-effects, like cache incoherence penalties due simultaneous writes to the same cache pages; - Focus on allocating and deallocating a single size for all the duration of the benchmark. Since all it does is allocate and deallocate, it will measure the tcache hotpath without any side-effects. - Allows to specify the allocation size as input argument. Reviewed-by: Wilco Dijkstra  <Wilco.Dijkstra@arm.com>