linux-kernel - Re: Performance overhead of paravirt

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Message-ID: <4A0C251B.9030101@zytor.com>
Date:	Thu, 14 May 2009 07:05:15 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>, Ingo Molnar <mingo@...e.hu>,
	"Xin, Xiaohui" <xiaohui.xin@...el.com>,
	"Li, Xin" <xin.li@...el.com>,
	"Nakajima, Jun" <jun.nakajima@...el.com>,
	Nick Piggin <npiggin@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	rostedt <rostedt@...tedt.homelinux.com>
Subject: Re: Performance overhead of paravirt_ops on native identified

Peter Zijlstra wrote:
> 
> This sounds remarkably like what the dynamic function call tracer does.
> 

I'm sure this has been invented before... probably more than once.  Far
too many things we invent don't get generalized.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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