[PATCH 0/2] tracing/hist: Add percentage histogram suffixes

["Masami Hiramatsu (Google)" <mhiramat@kernel.org>]

Hi,

Here are a couple of patches to add .percent and .graph histogram
value suffixes to show the value in percentage and in bar-graph.

This will help us to check the trend of the histogram instantly
without the post processing tool.

Here shows the example of the percentage and the bar graph of
the runtime of the running tasks.

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

{ pid:          8 } hitcount:         11  runtime:       4.11  runtime: #                   
{ pid:          9 } hitcount:          4  runtime:       1.28  runtime:                     
{ pid:         14 } hitcount:         10  runtime:       2.22  runtime:                     
{ pid:         15 } hitcount:          1  runtime:       0.07  runtime:                     
{ pid:         16 } hitcount:         21  runtime:       3.35  runtime: #                   
{ pid:         57 } hitcount:          6  runtime:       2.41  runtime: #                   
{ pid:         61 } hitcount:         42  runtime:       9.79  runtime: ####                
{ pid:         66 } hitcount:          5  runtime:       0.69  runtime:                     
{ pid:        147 } hitcount:         36  runtime:      45.33  runtime: ####################
{ pid:       8548 } hitcount:          9  runtime:      17.25  runtime: #######             
{ pid:       8549 } hitcount:          8  runtime:      13.43  runtime: #####               

Totals:
    Hits: 153
    Entries: 11
    Dropped: 0


Thank you,

---

Masami Hiramatsu (Google) (2):
      tracing: Add .percent suffix option to histogram values
      tracing: Add .graph suffix option to histogram value


 kernel/trace/trace.c             |    3 +
 kernel/trace/trace_events_hist.c |  110 ++++++++++++++++++++++++++++++++++++--
 2 files changed, 105 insertions(+), 8 deletions(-)

--
Masami Hiramatsu (Google) <mhiramat@kernel.org>