tracing: Add .percent suffix option to histogram values

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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:          8 } hitcount:          7  runtime (%):   4.14
 { pid:         14 } hitcount:          5  runtime (%):   3.69
 { pid:         16 } hitcount:         11  runtime (%):   3.41
 { pid:         61 } hitcount:         41  runtime (%):  19.75
 { pid:         65 } hitcount:          4  runtime (%):   1.48
 { pid:         70 } hitcount:          6  runtime (%):   3.60
 { pid:         72 } hitcount:          2  runtime (%):   1.10
 { pid:        144 } hitcount:         10  runtime (%):  32.01
 { pid:        151 } hitcount:          8  runtime (%):  22.66
 { pid:        152 } hitcount:          2  runtime (%):   8.10

 Totals:
     Hits: 96
     Entries: 10
     Dropped: 0
-----

Link: https://lore.kernel.org/linux-trace-kernel/166610813077.56030.4238090506973562347.stgit@devnote2

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Reviewed-by: Tom Zanussi <zanussi@kernel.org>
Tested-by: Tom Zanussi <zanussi@kernel.org>

...

This commit is contained in:

Masami Hiramatsu (Google) 2022-10-20 00:31:55 +09:00 • committed by Steven Rostedt (Google)

parent 5f2e094ed2

commit abaa5258ce

2 changed files with 78 additions and 15 deletions

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3

kernel/trace/trace.c

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90

kernel/trace/trace_events_hist.c

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