diff options
Diffstat (limited to 'tools/perf/Documentation/perf-diff.txt')
| -rw-r--r-- | tools/perf/Documentation/perf-diff.txt | 31 |
1 files changed, 22 insertions, 9 deletions
diff --git a/tools/perf/Documentation/perf-diff.txt b/tools/perf/Documentation/perf-diff.txt index da7809b15cc9..d5cc15e651cf 100644 --- a/tools/perf/Documentation/perf-diff.txt +++ b/tools/perf/Documentation/perf-diff.txt @@ -90,9 +90,10 @@ OPTIONS -c:: --compute:: - Differential computation selection - delta, ratio, wdiff, delta-abs - (default is delta-abs). Default can be changed using diff.compute - config option. See COMPARISON METHODS section for more info. + Differential computation selection - delta, ratio, wdiff, cycles, + delta-abs (default is delta-abs). Default can be changed using + diff.compute config option. See COMPARISON METHODS section for + more info. -p:: --period:: @@ -142,12 +143,14 @@ OPTIONS perf diff --time 0%-10%,30%-40% It also supports analyzing samples within a given time window - <start>,<stop>. Times have the format seconds.microseconds. If 'start' - is not given (i.e., time string is ',x.y') then analysis starts at - the beginning of the file. If stop time is not given (i.e, time - string is 'x.y,') then analysis goes to the end of the file. Time string is - 'a1.b1,c1.d1:a2.b2,c2.d2'. Use ':' to separate timestamps for different - perf.data files. + <start>,<stop>. Times have the format seconds.nanoseconds. If 'start' + is not given (i.e. time string is ',x.y') then analysis starts at + the beginning of the file. If stop time is not given (i.e. time + string is 'x.y,') then analysis goes to the end of the file. + Multiple ranges can be separated by spaces, which requires the argument + to be quoted e.g. --time "1234.567,1234.789 1235," + Time string is'a1.b1,c1.d1:a2.b2,c2.d2'. Use ':' to separate timestamps + for different perf.data files. For example, we get the timestamp information from 'perf script'. @@ -278,6 +281,16 @@ If specified the 'Weighted diff' column is displayed with value 'd' computed as: - WEIGHT-A being the weight of the data file - WEIGHT-B being the weight of the baseline data file +cycles +~~~~~~ +If specified the '[Program Block Range] Cycles Diff' column is displayed. +It displays the cycles difference of same program basic block amongst +two perf.data. The program basic block is the code between two branches. + +'[Program Block Range]' indicates the range of a program basic block. +Source line is reported if it can be found otherwise uses symbol+offset +instead. + SEE ALSO -------- linkperf:perf-record[1], linkperf:perf-report[1] |