linux-kernel - Re: [PATCHSET 0/7] perf sched: Introduce timehist command, again (v1)

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Message-ID: <468ed743-a7e9-44e4-6fcc-5853ab49447e@gmail.com>
Date:   Tue, 15 Nov 2016 08:14:24 -0700
From:   David Ahern <dsahern@...il.com>
To:     Ingo Molnar <mingo@...nel.org>, Namhyung Kim <namhyung@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Jiri Olsa <jolsa@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCHSET 0/7] perf sched: Introduce timehist command, again (v1)

On 11/15/16 12:34 AM, Ingo Molnar wrote:
> 
> * Namhyung Kim <namhyung@...nel.org> wrote:
> 
>>>> By default it shows the individual schedule events, including the time between
>>>> sched-in events for the task, the task scheduling delay (time between wakeup
>>>> and actually running) and run time for the task:
>>>>
>>>>            time cpu  task name[tid/pid]    b/n time sch delay  run time
>>>>   ------------- ---- -------------------- --------- --------- ---------
>>>>    79371.874569 [11] gcc[31949]               0.014     0.000     1.148
>>>>    79371.874591 [10] gcc[31951]               0.000     0.000     0.024
>>>>    79371.874603 [10] migration/10[59]         3.350     0.004     0.011
>>>>    79371.874604 [11] <idle>                   1.148     0.000     0.035
>>>>    79371.874723 [05] <idle>                   0.016     0.000     1.383
>>>>    79371.874746 [05] gcc[31949]               0.153     0.078     0.022
>>>> ...
>>>
>>> What does the 'b/n' abbreviation stand for? 'Between'? Could we call the column 
>>> 'sch wait' instead, or so?
>>
>> Looks better, or what about 'wait time'?
> 
> Works for me!

That column generically is time not running -- time between the last sched out and the current sched in. It could be expected (sleep, select, read, ...), waiting for a resource (disk I/O, mutex) or preemption.

> 
>> I'd go with the first option - simply adding arrows.  It's good enough to 
>> identify each function IMHO.
> 
> Ok!

I'd prefer the arrows too for a default. Color can be an add-on option.