linux-kernel - Re: [PATCH] ftrace, sched: Add TRACE_FLAG_PREEMPT

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Message-ID: <20131004162804.GR3081@twins.programming.kicks-ass.net>
Date:	Fri, 4 Oct 2013 18:28:04 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Yuanhan Liu <yuanhan.liu@...ux.intel.com>, mingo@...nel.org,
	hpa@...or.com, linux-kernel@...r.kernel.org, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org,
	Fengguang Wu <fengguang.wu@...el.com>,
	Huang Ying <ying.huang@...el.com>, lkp@...ux.intel.com
Subject: Re: [PATCH] ftrace, sched: Add TRACE_FLAG_PREEMPT_RESCHED

On Fri, Oct 04, 2013 at 11:57:12AM -0400, Steven Rostedt wrote:
> > +  need-resched:
> > +	'N' both TIF_NEED_RESCHED and PREEMPT_NEED_RESCHED is set,
> > +	'n' only TIF_NEED_RESCHED is set,
> > +	'p' only PREEMPT_NEED_RESCHED is set,
> > +	'.' otherwise.
> 
> Yes this is actually good enough. I'll have to spend time to explain
> this better. But I'll let you off the hook from doing it for me ;-)

beware; such endevours might lead to books and those are typically out
of date by the time they hit the street -- ie. they're a fair waste of
time ;-)
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