perf/Documentation/perf-diff.txt

11 'perf diff' [baseline file] [data file1] [[data file2] ... ]
34 --kallsyms=<file>::
44 	file://filename entries.  This option will affect the percentage
50 	file://filename entries.  This option will affect the percentage
56 	file://filename entries.  This option will affect the percentage
115        (data from the first file other base baseline).  Values more than 1
153 	the beginning of the file. If stop time is not given (i.e. time
154 	string is 'x.y,') then analysis goes to the end of the file.
191 The comparison is governed by the baseline file. The baseline perf.data
192 file is iterated for samples. All other perf.data files specified on
201 - file A with samples f1, f2, f3, f4,    f6
202 - file B with samples     f2,     f4, f5
203 - file C with samples f1, f2,         f5
251   - A/B being matching hist entry from data/baseline file specified
255     single data file
272   - A/B being matching hist entry from data/baseline file specified
283   - A/B being matching hist entry from data/baseline file specified
290     - WEIGHT-A being the weight of the data file
291     - WEIGHT-B being the weight of the baseline data file