linux-kernel - Re: [PATCH V4 1/2] tracing, perf : add cpu hotplug trace events

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Date:	Thu, 24 Feb 2011 15:26:00 +0100
From:	Vincent Guittot <vincent.guittot@...aro.org>
To:	linux-kernel@...r.kernel.org, linux-hotplug@...r.kernel.org,
	fweisbec@...il.com, rostedt@...dmis.org, amit.kucheria@...aro.org
Subject: Re: [PATCH V4 1/2] tracing, perf : add cpu hotplug trace events

Hi,

Any comments or feedbacks about these both patches ?

Thanks,
Vincent

On 31 January 2011 11:22, Vincent Guittot <vincent.guittot@...aro.org> wrote:
> Please find below a new proposal for adding trace events for cpu hotplug.
> The goal is to measure the latency of each part (kernel, architecture)
> and also to trace the cpu hotplug activity with other power events. I
> have tested these traces events on an arm platform.
>
> Subject: [PATCH 1/2] cpu hotplug tracepoint
>
> this patch adds new events for cpu hotplug tracing
>  * plug/unplug sequence
>  * core and architecture latency measurements
>
> Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
> ---
>  include/trace/events/cpu_hotplug.h |  103 ++++++++++++++++++++++++++++++++++++
>  1 files changed, 103 insertions(+), 0 deletions(-)
>  create mode 100644 include/trace/events/cpu_hotplug.h
>
> diff --git a/include/trace/events/cpu_hotplug.h
> b/include/trace/events/cpu_hotplug.h
> new file mode 100644
> index 0000000..af05775
> --- /dev/null
> +++ b/include/trace/events/cpu_hotplug.h
> @@ -0,0 +1,103 @@
> +#undef TRACE_SYSTEM
> +#define TRACE_SYSTEM cpu_hotplug
> +
> +#if !defined(_TRACE_CPU_HOTPLUG_H) || defined(TRACE_HEADER_MULTI_READ)
> +#define _TRACE_CPU_HOTPLUG_H
> +
> +#include <linux/tracepoint.h>
> +
> +DECLARE_EVENT_CLASS(cpu_hotplug,
> +
> +       TP_PROTO(unsigned int cpuid),
> +
> +       TP_ARGS(cpuid),
> +
> +       TP_STRUCT__entry(
> +               __field(        unsigned int,   cpuid   )
> +       ),
> +
> +       TP_fast_assign(
> +               __entry->cpuid = cpuid;
> +       ),
> +
> +       TP_printk("cpuid=%u", __entry->cpuid)
> +);
> +
> +/* Core function of cpu hotplug */
> +
> +DEFINE_EVENT(cpu_hotplug, cpu_hotplug_down_start,
> +
> +       TP_PROTO(unsigned int cpuid),
> +
> +       TP_ARGS(cpuid)
> +);
> +
> +DEFINE_EVENT(cpu_hotplug, cpu_hotplug_down_end,
> +
> +       TP_PROTO(unsigned int cpuid),
> +
> +       TP_ARGS(cpuid)
> +);
> +
> +DEFINE_EVENT(cpu_hotplug, cpu_hotplug_up_start,
> +
> +       TP_PROTO(unsigned int cpuid),
> +
> +       TP_ARGS(cpuid)
> +);
> +
> +DEFINE_EVENT(cpu_hotplug, cpu_hotplug_up_end,
> +
> +       TP_PROTO(unsigned int cpuid),
> +
> +       TP_ARGS(cpuid)
> +);
> +
> +/* Architecture function for cpu hotplug */
> +
> +DEFINE_EVENT(cpu_hotplug, cpu_hotplug_disable_start,
> +
> +       TP_PROTO(unsigned int cpuid),
> +
> +       TP_ARGS(cpuid)
> +);
> +
> +DEFINE_EVENT(cpu_hotplug, cpu_hotplug_disable_end,
> +
> +       TP_PROTO(unsigned int cpuid),
> +
> +       TP_ARGS(cpuid)
> +);
> +
> +DEFINE_EVENT(cpu_hotplug, cpu_hotplug_die_start,
> +
> +       TP_PROTO(unsigned int cpuid),
> +
> +       TP_ARGS(cpuid)
> +);
> +
> +DEFINE_EVENT(cpu_hotplug, cpu_hotplug_die_end,
> +
> +       TP_PROTO(unsigned int cpuid),
> +
> +       TP_ARGS(cpuid)
> +);
> +
> +DEFINE_EVENT(cpu_hotplug, cpu_hotplug_arch_up_start,
> +
> +       TP_PROTO(unsigned int cpuid),
> +
> +       TP_ARGS(cpuid)
> +);
> +
> +DEFINE_EVENT(cpu_hotplug, cpu_hotplug_arch_up_end,
> +
> +       TP_PROTO(unsigned int cpuid),
> +
> +       TP_ARGS(cpuid)
> +);
> +
> +#endif /* _TRACE_CPU_HOTPLUG_H */
> +
> +/* This part must be outside protection */
> +#include <trace/define_trace.h>
> --
> 1.7.1
>
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