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

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Date:	Mon, 1 Jul 2013 15:13:11 +0530
From:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
To:	Lei Wen <leiwen@...vell.com>
Cc:	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, kamalesh@...ux.vnet.ibm.com
Subject: Re: [PATCH 1/2] sched: add trace events for task and rq usage
 tracking

* 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:

+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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