Aggregating function calls from WPR / xperf profiling data, for example. KCacheGrind?

Is it possible to load WPR / xperf to profile data in KCacheGrind ? Or is there a way to aggregate function calls in WPA directly? Or some other tool? Would the gprof2dot / graphviz route be better ?

I find WPA useful, but the stacking grouping in the CPU Usage (Sampled) table doesn't seem to be able to sort by aggregated number of function calls. For example, if a function foo

is named the same from 10 different places, it would be difficult to identify foo

as a potential bottleneck, since each of the 10 code paths to foo

will show up as 10% or less of weight, KCacheGrind solves this problem by allowing you to sort by cumulative time for each function ...

How can I sort the cumulative time taken by each function with profiling on Windows eg. identify low level common functions like malloc as bottleneck?