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Date: Sat, 9 Aug 2008 03:19:55 +0200
From: Andi Kleen <andi@firstfloor.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Andi Kleen <andi@firstfloor.org>,
       Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
       LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>,
       Thomas Gleixner <tglx@linutronix.de>,
       Peter Zijlstra <peterz@infradead.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Linus Torvalds <torvalds@linux-foundation.org>,
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       Arnaldo Carvalho de Melo <acme@redhat.com>,
       "Luis Claudio R. Goncalves" <lclaudio@uudg.org>,
       Clark Williams <williams@redhat.com>
Subject: Re: [PATCH 0/5] ftrace: to kill a daemon
Message-ID: <20080809011955.GE9038@one.firstfloor.org>
References: <20080808172259.GB8244@Krystal> <alpine.DEB.1.10.0808081334010.4436@gandalf.stny.rr.com> <20080808174607.GG8244@Krystal> <alpine.DEB.1.10.0808081410380.6116@gandalf.stny.rr.com> <20080808182104.GA11376@Krystal> <alpine.DEB.1.10.0808081432400.8922@gandalf.stny.rr.com> <20080808190506.GD11376@Krystal> <alpine.DEB.1.10.0808081750590.16691@gandalf.stny.rr.com> <87tzdv2g05.fsf@basil.nowhere.org> <alpine.DEB.1.10.0808082030500.1396@gandalf.stny.rr.com>
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> I wish we had a true 5 byte nop. The alternative is a jmp 0, which is 
> measurable.  This is replacing mcount from a kernel compile with the -pg 

Scary usage.  How much is the difference? 

BTW a good way to get most of that back would be to not use frame 
pointers if you have them enabled ;-) Unfortunately recently
the "select FRAME_POINTER"s keep creeping all over so far too many kernels
suffer from this slow mode now :-/

-Andi
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