linux-kernel - Re: [PATCH 0/2] tracing/hist: Add percentage histogram suffixes

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Date:   Mon, 1 Aug 2022 16:58:40 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc:     Tom Zanussi <zanussi@...nel.org>, Ingo Molnar <mingo@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] tracing/hist: Add percentage histogram suffixes

On Mon,  1 Aug 2022 12:00:40 +0900
"Masami Hiramatsu (Google)" <mhiramat@...nel.org> wrote:

> 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
> 

Hi Masami,

Thanks for this as well. But as it's a new feature, and I freeze new
features when the merge window starts, I'll add this to my queue for the
next window.

-- Steve