linux-kernel - Re: [Xen-devel] Re: [PATCH 3/5] x86/pvclock: add vsyscall implementation

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Message-ID: <4AE81011.4040904@redhat.com>
Date:	Wed, 28 Oct 2009 11:34:09 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Glauber Costa <glommer@...hat.com>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	kurt.hackel@...cle.com, the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Glauber de Oliveira Costa <gcosta@...hat.com>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Keir Fraser <keir.fraser@...citrix.com>, zach.brown@...cle.com,
	chris.mason@...cle.com, Ingo Molnar <mingo@...hat.com>
Subject: Re: [Xen-devel] Re: [PATCH 3/5] x86/pvclock: add vsyscall	implementation

On 10/28/2009 11:29 AM, Glauber Costa wrote:
>> How can you reliably measure performance in a virtualized environment?
>>      
> If we loop gettimeofday(), I would expect the vsyscall-based version not to show
> up in strace, right?
>    

Much better to have an API for this.  Life is hacky enough already.

-- 
error compiling committee.c: too many arguments to function

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