linux-kernel - Re: [RFC/PATCH] Prevent wasting time to find out get_parent

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Date:	Tue, 24 Apr 2012 14:18:04 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Minho Ban <mhban@...sung.com>, Ingo Molnar <mingo@...hat.com>,
	linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Paul Turner <pjt@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Josh Triplett <josh@...htriplett.org>
Subject: Re: [RFC/PATCH] Prevent wasting time to find out get_parent_ip

On Tue, 2012-04-24 at 14:53 +0200, Peter Zijlstra wrote:
> On Tue, 2012-04-24 at 21:36 +0900, Minho Ban wrote:
> > trace_preempt_on/off looks empty if PREEMPT_TRACER is off. But actually it is
> > spending time to find out get_parent_ip(even CALLER_ADDR for some ARCH) which is
> > in argument. This seems not fair for those who expect to do nothing but increase
> > or decrease count.
> 
> You can do the same by making them CPP macros and adding a comment as to
> why they're macros instead of inlines..

I should read the thread before answering. I just repeated basically
exactly what you said ;-)

-- Steve



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