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

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Message-ID: <AANLkTinob=u4BGpZgzgDKkYWZz=5S8wSfdoQvLSr=DRU@mail.gmail.com>
Date:	Mon, 17 Jan 2011 11:33:58 -0600
From:	Vincent Guittot <vincent.guittot@...aro.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-hotplug@...r.kernel.org,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...e.hu>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Amit Kucheria <amit.kucheria@...aro.org>
Subject: Re: [PATCH] tracing, perf : add cpu hotplug trace events

On 17 January 2011 10:21, Frederic Weisbecker <fweisbec@...il.com> wrote:
> On Mon, Jan 17, 2011 at 07:49:58AM -0600, Vincent Guittot wrote:
>> I was just wondering which tracepoints format between my 1st proposal
>> and yours was the easier to post process by an application like
>> pytimechart.
>
> No idea as pytimechart uses his own ad hoc event parsing. Either
> way there won't be much differences though.
>
>> I have updated the cpu hotplug tracepoint according to your remarks
>> and steve's ones. I have just replaced the second
>> cpu_arch_die_start/end in your proposal by cpu_arch_dead_start/endfrq
>
> Tracepoints tend to describe actions rather than states, although I can
> show you some exceptions as well. But this tends to be the major
> tendency. I suggest you to be stay consistent with this scheme.
>

For the cpu_die function which is called in the idle loop, we use
cpu_hotplug_arch_die_start/end
and for the __cpu_die function which waits for the cpu death, we could
use cpu_hotplug_arch_wait_death_start/end ?

as a summary we have :

cpu_hotplug_up_start/end
cpu_hotplug_down_start/end
cpu_hotplug_arch_up_start/end
cpu_hotplug_arch_disable_start/end
cpu_hotplug_arch_die_start/end
cpu_hotplug_arch_wait_death_start/end


> Thanks.
>
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