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

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Message-ID: <C1FBAFD7.99AB%keir@xensource.com>
Date:	Fri, 16 Feb 2007 19:00:39 +0000
From:	Keir Fraser <keir@...source.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Keir Fraser <keir@...source.com>
CC:	<xen-devel@...ts.xensource.com>, Andi Kleen <ak@....de>,
	<linux-kernel@...r.kernel.org>,
	Ian Pratt <Ian.Pratt@...source.com>,
	Chris Wright <chrisw@...s-sol.org>,
	<virtualization@...ts.osdl.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Hand <steven.hand@...cam.ac.uk>,
	Christian Limpach <Christian.Limpach@...source.com>
Subject: Re: [Xen-devel] Re: [patch 14/21] Xen-paravirt: Add XEN config
 options and disableunsupported config options.

On 16/2/07 17:46, "Jeremy Fitzhardinge" <jeremy@...p.org> wrote:

> Keir Fraser wrote:
>> This initial patchset does not include save/restore support anyway, so in
>> fact it would be consistent to have CONFIG_PREEMPT configurable. I'm sure
>> that we are going to have some nasty bugs to fix up as a result, but we
>> can't fix them until we find them! Then we can convert our save/restore code
>> to use the freezer before submitting it for inclusion.
> OK.  So that makes the only config restriction the 100Hz ticks.

We can extend the Xen timer interface quite easily and get rid of this one
too. In fact it doesn't *much* matter if the CONFIG_HZ differs from the Xen
ticker rate -- we modified the Linux timer ISR to handle timer interrupts at
arbitrary times already. The only drawback is that jiffies updates in burts
if CONFIG_HZ is higher than the actual tick rate, and this can affect some
calibration constants and cause Linux to print out some weird values at
start-of-day.

 -- Keir

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