linux-kernel - Re: [PATCH 2/2] tracing, sched: Add a new tracepoint for sleeptime

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Date:	Tue, 20 Dec 2011 14:19:55 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Arun Sharma <asharma@...com>
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Andrew Vagin <avagin@...nvz.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH 2/2] tracing, sched: Add a new tracepoint for sleeptime

On Tue, 2011-12-20 at 10:22 -0800, Arun Sharma wrote:
> On 12/20/11 10:16 AM, Steven Rostedt wrote:
> 
> >> +#ifdef CREATE_TRACE_POINTS
> >
> > Why the #ifdef? a static inline is fine to keep in the open. If nothing
> > uses it, then it just wont be used or defined.
> >
> 
> Without the ifdef I get:
> 
> In file included from include/trace/define_trace.h:80,
>                   from include/trace/events/sched.h:445,
>                   from kernel/sched/core.c:86:
> include/trace/events/sched.h:366: error: redefinition of 
> ‘trace_get_sleeptime’
> include/trace/events/sched.h:366: note: previous definition of 
> ‘trace_get_sleeptime’ was here
> 
> So I shamelessly copied what the other static inline function in the 
> file does.

Ah, OK, it's because of the duplicate includes. Still ugly though. But
we can clean that up later.


> 
> I also noticed that sched_stat_sleeptime() is very similar to 
> sched_stat_sleep(). The latter covers sleeps but not iowait and doesn't 
> include the scheduler latency. Let me know if you think this is a show 
> stopper that needs a rename.

what about sched_stat_iowait() too. As for latency, I don't know. That's
more Peter's decision.

-- Steve


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