linux-kernel - Re: [Xen-devel] [patch 30/44] xen: Add support for preemption

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Message-ID: <4727690F.4030502@goop.org>
Date:	Tue, 30 Oct 2007 10:25:35 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	tgh <wwwwww4187@...a.com.cn>
CC:	Jeremy Fitzhardinge <jeremy@...source.com>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Andi Kleen <ak@...e.de>, lkml <linux-kernel@...r.kernel.org>,
	Chris Wright <chrisw@...s-sol.org>,
	Andrew Morton <akpm@...ux-foundation.com>
Subject: Re: [Xen-devel] [patch 30/44] xen: Add support for preemption

tgh wrote:
> hi
> I am using xen,and I am curious about whether Xen support the preempt
> scheduler for the VMs or not
> could the VM be prempted by xen to scheduler another VM?
>   

Yes, that's the normal mode of operation. The hypervisor will timeslice
multiple vcpus onto a single vcpu.

This patch doesn't relate to that; it's whether a Xen Linux guest's
kernel can be preempted to reschedule processes while running under Xen.
The normal xen-unstable or vendor Xen kernels don't support this, but
the mainline kernel with paravirt_ops/xen support does.

J
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