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

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Message-ID: <4EF0D262.5000405@fb.com>
Date:	Tue, 20 Dec 2011 10:22:26 -0800
From:	Arun Sharma <asharma@...com>
To:	Steven Rostedt <rostedt@...dmis.org>
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 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.

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.

  -Arun
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