linux-kernel - Re: [PATCH V2] tracing, perf : add cpu hotplug trace events

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Message-ID: <1295630906.12215.4244.camel@gandalf.stny.rr.com>
Date:	Fri, 21 Jan 2011 12:28:26 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Vincent Guittot <vincent.guittot@...aro.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, linux-hotplug@...r.kernel.org,
	amit.kucheria@...aro.org
Subject: Re: [PATCH V2] tracing, perf : add cpu hotplug trace events

On Fri, 2011-01-21 at 09:43 +0100, Vincent Guittot wrote:
> On 20 January 2011 17:11, Frederic Weisbecker <fweisbec@...il.com> wrote:

> >
> >> +DEFINE_EVENT(cpu_hotplug, cpu_hotplug_arch_wait_die_start,
> >> +
> >> +     TP_PROTO(unsigned int cpuid),
> >> +
> >> +     TP_ARGS(cpuid)
> >> +);
> >> +
> >> +DEFINE_EVENT(cpu_hotplug, cpu_hotplug_arch_wait_die_end,
> >> +
> >> +     TP_PROTO(unsigned int cpuid),
> >> +
> >> +     TP_ARGS(cpuid)
> >> +);
> >
> > What is wait die, compared to die for example?
> >
> 
> The arch_wait_die is used to trace the process which waits for the cpu
> to die (__cpu_die) and the arch_die is used to trace when the cpu dies
> (cpu_die)

Shouldn't that be "cpu_hotplug_arch_task_wait_die" then? If it is a task
that is waiting?

-- Steve

> 
> > We need those tracepoints to be applied to get that reviewable in practice.
> >
> 
> Ok, I'm going to send a proposal
> 
> > Thanks.
> >


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