linux-kernel - Re: [PATCH 2/2] tracing, sched: Add delay info to sched

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Message-ID: <1324337685.5916.47.camel@gandalf.stny.rr.com>
Date:	Mon, 19 Dec 2011 18:34:45 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Arun Sharma <asharma@...com>, linux-kernel@...r.kernel.org,
	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 delay info to sched_switch

On Tue, 2011-12-20 at 00:28 +0100, Peter Zijlstra wrote:
> On Mon, 2011-12-19 at 15:23 -0800, Arun Sharma wrote:
> > +#ifdef CONFIG_SCHEDSTATS
> > +               __entry->delay          = next->se.statistics.block_start ? next->se.statistics.block_start
> > +                                         : next->se.statistics.sleep_start ? next->se.statistics.sleep_start : 0;
> > +               __entry->delay = __entry->delay ? now - __entry->delay : 0;
> > +#else
> > +               __entry->delay = 0;
> > +#endif 
> 
> I don't really like this, this should be one of those sched_*_stat
> thingies, not sched_switch().

Agreed.

-- Steve


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