use function input parameter as period for perf #328
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When using perf probe to analyze memory leaks, the output results may include the memory application size.
perf probe output example
This PR attempts to use this size information. The width of the flame graph in this way represents the requested memory size rather than the number of times.
Inspired by https://github.com/brendangregg/BPF-tools/blob/master/old/2017-12-23/mallocstacks.py