perf_hpp__register_sort_field 1677 tools/perf/builtin-diff.c 	perf_hpp__register_sort_field(fmt);
perf_hpp__register_sort_field  605 tools/perf/ui/hist.c 		perf_hpp__register_sort_field(fmt);
perf_hpp__register_sort_field 2370 tools/perf/util/sort.c 	perf_hpp__register_sort_field(&hde->hpp);