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From: Keir Fraser <keir@xensource.com>
To: Jeremy Fitzhardinge <jeremy@goop.org>, Keir Fraser <keir@xensource.com>
Cc: <xen-devel@lists.xensource.com>, Andi Kleen <ak@muc.de>,
	<linux-kernel@vger.kernel.org>,
	Ian Pratt <Ian.Pratt@xensource.com>,
	Chris Wright <chrisw@sous-sol.org>,
	<virtualization@lists.osdl.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Steven Hand <steven.hand@cl.cam.ac.uk>,
	Christian Limpach <Christian.Limpach@xensource.com>
Subject: Re: [Xen-devel] Re: [patch 14/21] Xen-paravirt: Add XEN config options and disableunsupported config options.
Date: Fri, 16 Feb 2007 19:00:39 +0000	[thread overview]
Message-ID: <C1FBAFD7.99AB%keir@xensource.com> (raw)
In-Reply-To: <45D5EDDB.7050404@goop.org>

On 16/2/07 17:46, "Jeremy Fitzhardinge" <jeremy@goop.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


WARNING: multiple messages have this Message-ID
From: Keir Fraser <keir@xensource.com>
To: Jeremy Fitzhardinge <jeremy@goop.org>, Keir Fraser <keir@xensource.com>
Cc: xen-devel@lists.xensource.com, virtualization@lists.osdl.org,
	Steven Hand <steven.hand@cl.cam.ac.uk>,
	linux-kernel@vger.kernel.org, Chris Wright <chrisw@sous-sol.org>,
	Andi Kleen <ak@muc.de>, Andrew Morton <akpm@linux-foundation.org>,
	Ian Pratt <Ian.Pratt@xensource.com>,
	Christian Limpach <Christian.Limpach@xensource.com>
Subject: Re: Re: [patch 14/21] Xen-paravirt: Add XEN config options and disableunsupported config options.
Date: Fri, 16 Feb 2007 19:00:39 +0000	[thread overview]
Message-ID: <C1FBAFD7.99AB%keir@xensource.com> (raw)
In-Reply-To: <45D5EDDB.7050404@goop.org>

On 16/2/07 17:46, "Jeremy Fitzhardinge" <jeremy@goop.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

  parent reply	other threads:[~2007-02-16 19:00 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-16 10:00 [patch 14/21] Xen-paravirt: Add XEN config options and disableunsupported config options Christian Limpach
2007-02-16 10:00 ` Christian Limpach
2007-02-16 10:09 ` Andrew Morton
2007-02-16 10:09   ` Andrew Morton
2007-02-16 10:47   ` Keir Fraser
2007-02-16 10:47   ` Keir Fraser
2007-02-16 10:47     ` Keir Fraser
2007-02-16 10:54     ` Andrew Morton
2007-02-16 10:54       ` Andrew Morton
2007-02-16 11:03       ` Keir Fraser
2007-02-16 11:03       ` Keir Fraser
2007-02-16 11:03         ` Keir Fraser
2007-02-16 17:46         ` [Xen-devel] " Jeremy Fitzhardinge
2007-02-16 17:46           ` Jeremy Fitzhardinge
2007-02-16 19:00           ` [Xen-devel] " Keir Fraser
2007-02-16 19:00           ` Keir Fraser [this message]
2007-02-16 19:00             ` Keir Fraser
2007-02-16 19:24             ` [Xen-devel] " Jeremy Fitzhardinge
2007-02-16 19:24               ` Jeremy Fitzhardinge
2007-02-16 21:51             ` [Xen-devel] " Zachary Amsden
2007-02-16 21:51               ` Zachary Amsden
2007-02-16 22:38               ` [Xen-devel] " Dan Hecht
2007-02-17 15:06                 ` Rik van Riel
2007-02-17 15:06                   ` Rik van Riel
2007-02-16 19:00           ` [Xen-devel] " Keir Fraser
2007-02-16 11:03       ` Keir Fraser
2007-02-16 10:47   ` Keir Fraser

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