linux-kernel - Re: [PATCH 0/5] ftrace: to kill a daemon

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Message-Id: <E1KRmxa-0001S5-E0@be1.7eggert.dyndns.org>
Date:	Sat, 09 Aug 2008 13:50:14 +0200
From:	Bodo Eggert <7eggert@....de>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Andi Kleen <andi@...stfloor.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Roland McGrath <roland@...hat.com>,
	Ulrich Drepper <drepper@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Gregory Haskins <ghaskins@...ell.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	"Luis Claudio R. Goncalves" <lclaudio@...g.org>,
	Clark Williams <williams@...hat.com>
Subject: Re: [PATCH 0/5] ftrace: to kill a daemon

Steven Rostedt <rostedt@...dmis.org> wrote:
> On Sat, 9 Aug 2008, Andi Kleen wrote:
>> Steven Rostedt <rostedt@...dmis.org> writes:

>> > I'm stubborn, I want to get it right _and_ keep it fast.
>> 
>> For me it would seem better to just not use two part 5 byte nops
>> instead of adding such hacks.  I doubt there are that many of them
>> anyways. I bet you won't be able to measure any difference between the
>> different nop types in any macro benchmark.
> 
> I wish we had a true 5 byte nop. The alternative is a jmp 0, which is
> measurable.

Did you try short jumps? (0xeb 0x03 0x?? 0x?? 0x??)

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