linux-kernel - Re: [PATCH 1/2] sched: add trace events for task and rq usage tracking

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Message-ID: <CALZhoSSoZHTM_NE=7EB7bGY83=D4dgZyYNX1WRd+Lafsdn11TA@mail.gmail.com>
Date:	Mon, 1 Jul 2013 20:18:59 +0800
From:	Lei Wen <adrian.wenl@...il.com>
To:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
Cc:	Lei Wen <leiwen@...vell.com>, Paul Turner <pjt@...gle.com>,
	Alex Shi <alex.shi@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>, mingo@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] sched: add trace events for task and rq usage tracking

Hi Kamalesh,

On Mon, Jul 1, 2013 at 5:43 PM, Kamalesh Babulal
<kamalesh@...ux.vnet.ibm.com> wrote:
> * Lei Wen <leiwen@...vell.com> [2013-07-01 15:10:32]:
>
>> Since we could track task in the entity level now, we may want to
>> investigate tasks' running status by recording the trace info, so that
>> could make some tuning if needed.
>>
>> Signed-off-by: Lei Wen <leiwen@...vell.com>
>> ---
>>  include/trace/events/sched.h |   73 ++++++++++++++++++++++++++++++++++++++++++
>>  kernel/sched/fair.c          |   29 +++++++++++++++--
>>  2 files changed, 100 insertions(+), 2 deletions(-)
>
> [...]
>
>>
>> +TRACE_EVENT(sched_cfs_rq_runnable_load,
>> +
>> +     TP_PROTO(int cpu, unsigned long load, unsigned long total),
>> +
>> +     TP_ARGS(cpu, load, total),
>> +
>> +     TP_STRUCT__entry(
>> +             __field(int, cpu)
>> +             __field(unsigned long, load)
>> +             __field(unsigned long, total)
>> +     ),
>> +
>> +     TP_fast_assign(
>> +             __entry->cpu   = cpu;
>> +             __entry->load  = load;
>> +             __entry->total = total;
>> +     ),
>> +
>> +     TP_printk("cpu=%d avg=%lu total=%lu",
>> +                     __entry->cpu,
>> +                     __entry->load,
>> +                     __entry->total)
>> +);
>> +
>> +TRACE_EVENT(sched_cfs_rq_blocked_load,
>> +
>> +     TP_PROTO(int cpu, unsigned long load, unsigned long total),
>> +
>> +     TP_ARGS(cpu, load, total),
>> +
>> +     TP_STRUCT__entry(
>> +             __field(int, cpu)
>> +             __field(unsigned long, load)
>> +             __field(unsigned long, total)
>> +     ),
>> +
>> +     TP_fast_assign(
>> +             __entry->cpu   = cpu;
>> +             __entry->load  = load;
>> +             __entry->total = total;
>> +     ),
>> +
>> +     TP_printk("cpu=%d avg=%lu total=%lu",
>> +                     __entry->cpu,
>> +                     __entry->load,
>> +                     __entry->total)
>> +);
>> +
>>  #endif /* _TRACE_SCHED_H */
>
> above trace points are same and be folded using EVENT_CLASS:

Nice abstract. I would merge your change for my V2 patch.

Thanks,
Lei

>
> +DECLARE_EVENT_CLASS(sched_cfs_rq_load_contri_template,
> +
> +       TP_PROTO(int cpu, unsigned long load, unsigned long total),
> +
> +       TP_ARGS(cpu, load, total),
> +
> +       TP_STRUCT__entry(
> +               __field(int, cpu)
> +               __field(unsigned long, load)
> +               __field(unsigned long, total)
> +       ),
> +
> +       TP_fast_assign(
> +               __entry->cpu   = cpu;
> +               __entry->load  = load;
> +               __entry->total = total;
> +       ),
> +
> +       TP_printk("cpu=%d avg=%lu total=%lu",
> +                       __entry->cpu,
> +                       __entry->load,
> +                       __entry->total)
> +);
> +
> +DEFINE_EVENT(sched_cfs_rq_load_contri_template, sched_cfs_rq_runnable_load,
> +       TP_PROTO(int cpu, unsigned long load, unsigned long total),
> +       TP_ARGS(cpu, load, total));
> +
> +DEFINE_EVENT(sched_cfs_rq_load_contri_template, sched_cfs_rq_blocked_load,
> +       TP_PROTO(int cpu, unsigned long load, unsigned long total),
> +       TP_ARGS(cpu, load, total));
> +
>
> --
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