linux-kernel - Re: + stupid-hack-to-make-mainline-build.patch added to -mm tree

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Message-ID: <C2157693.381A%Keir.Fraser@cl.cam.ac.uk>
Date:	Thu, 08 Mar 2007 08:15:15 +0000
From:	Keir Fraser <Keir.Fraser@...cam.ac.uk>
To:	Ingo Molnar <mingo@...e.hu>, Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Virtualization Mailing List <virtualization@...ts.osdl.org>,
	john stultz <johnstul@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>, <tglx@...utronix.de>,
	<akpm@...ux-foundation.org>
Subject: Re: + stupid-hack-to-make-mainline-build.patch added to -mm tree

On 8/3/07 08:01, "Ingo Molnar" <mingo@...e.hu> wrote:

> you are obsessed with avoiding a hypercall, but why? Granted it's slow
> especially on things like SVN/VMX, but it's not fundamentally slow. We
> definitely do not want to design our whole APIs and abstractions around
> the temporary notion that 'hypercalls are slow'. I'd expect hypercalls
> to be put into silicon just as much as SYSENTER was put into silicon.

If syscalls are already so fast, why does Linux have vgettimeofday()?

 -- Keir


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