linux-kernel - Re: [PATCH] tracing: Cleanup the convoluted softirq tracepoints

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Date:	Wed, 20 Oct 2010 00:17:28 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Jason Baron <jbaron@...hat.com>
cc:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Koki Sanagi <sanagi.koki@...fujitsu.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	nhorman@...driver.com, scott.a.mcmillan@...el.com,
	laijs@...fujitsu.com, "H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>, eric.dumazet@...il.com,
	kaneshige.kenji@...fujitsu.com, David Miller <davem@...emloft.net>,
	izumi.taku@...fujitsu.com, kosaki.motohiro@...fujitsu.com,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	"Luck, Tony" <tony.luck@...el.com>
Subject: Re: [PATCH] tracing: Cleanup the convoluted softirq tracepoints

On Tue, 19 Oct 2010, Thomas Gleixner wrote:
> On Tue, 19 Oct 2010, Jason Baron wrote:
> > > Now even worse, when you NOP out the jmpq then your tracepoint is
> > > still not enabled. Brilliant !
> > > 
> > 
> > The 'jmpq' in the enabled case is patched with a jmpq to the body of the
> > tracepoint itself.
> 
> Brilliant.

IOW, We now jump around the jump which jumps around the disabled code.

Thanks,

	tglx

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