tree ee797a436f06b3f865d0d15d8d5ed0309e05bb66
parent 2b0a73549f8fb4115c06639c75a4b7abd7825aaa
author Masami Hiramatsu (Google) <mhiramat@kernel.org> 1659663317 +0900
committer Tom Zanussi <zanussi@kernel.org> 1661458621 -0500

tracing: Add .percent suffix option to histogram values

Add .percent suffix option to show the histogram values in percentage.
This feature is useful when we need yo undersntand the overall trend
for the histograms of large values.
E.g. this shows the runtime percentage for each tasks.

------
  # cd /sys/kernel/debug/tracing/
  # echo hist:keys=pid:vals=hitcount,runtime.percent:sort=pid > \
    events/sched/sched_stat_runtime/trigger
  # sleep 10
  # cat events/sched/sched_stat_runtime/hist
 # event histogram
 #
 # trigger info: hist:keys=pid:vals=hitcount,runtime.percent:sort=pid:size=2048 [active]
 #

 { pid:         14 } hitcount:          9  runtime:       2.48
 { pid:         16 } hitcount:         38  runtime:       5.11
 { pid:         59 } hitcount:         30  runtime:      10.30
 { pid:         61 } hitcount:         73  runtime:      13.19
 { pid:         64 } hitcount:          1  runtime:       0.22
 { pid:         65 } hitcount:         13  runtime:       2.53
 { pid:         67 } hitcount:         11  runtime:       2.35
 { pid:         69 } hitcount:          8  runtime:       1.40
 { pid:         77 } hitcount:          7  runtime:       1.83
 { pid:        145 } hitcount:         41  runtime:      33.03
 { pid:        152 } hitcount:          8  runtime:      11.90
 { pid:        153 } hitcount:          6  runtime:       8.09
 { pid:        154 } hitcount:          5  runtime:       7.50

 Totals:
     Hits: 250
     Entries: 13
     Dropped: 0
-----

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

 Conflicts:
	kernel/trace/trace_events_hist.c