linux-kernel - Re: [patch 14/21] Xen-paravirt: Add XEN config options and disable unsupported config options.

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Message-ID: <45D565D7.5070303@goop.org>
Date:	Fri, 16 Feb 2007 00:05:43 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Dan Hecht <dhecht@...are.com>
CC:	Andi Kleen <ak@....de>, Chris Wright <chrisw@...s-sol.org>,
	virtualization@...ts.osdl.org, xen-devel@...ts.xensource.com,
	Ian Pratt <ian.pratt@...source.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 14/21] Xen-paravirt: Add XEN config options and disable
 unsupported config options.

Dan Hecht wrote:
> On 02/15/2007 11:04 PM, Jeremy Fitzhardinge wrote:
>> HZ - I'm assuming dynticks will appear in the short term, and this will
>> become moot
>
> Doesn't Xen send any non-blocked domain a 100hz alarm implicitly,
> without anyway for the guest to disable it?  I guess you'll have to
> break kernel/hypervisor compatibility if you want dynticks? 

The timer VIRQ will generate events at a fixed 100Hz (which can be
masked, like any other event), but you can also ask for a timer event at
a particular time.  We do this already for tickless idle.

    J
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