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

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Date:	Sat, 17 Feb 2007 15:04:35 +1100
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Zachary Amsden <zach@...are.com>
Cc:	Keir Fraser <keir@...source.com>,
	Chris Wright <chrisw@...s-sol.org>,
	Ian Pratt <ian.pratt@...source.com>,
	xen-devel@...ts.xensource.com, Andi Kleen <ak@....de>,
	virtualization@...ts.osdl.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Hand <steven.hand@...cam.ac.uk>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>
Subject: Re: [Xen-devel] Re: [patch 14/21] Xen-paravirt: Add XEN config
	options and disable unsupported config options.

On Fri, 2007-02-16 at 02:19 -0800, Zachary Amsden wrote:
> Doesn't stop_machine_run already take care of getting you out of all 
> kernel threads?  So you can only be sleeping, not preempted, in which 
> case, this might not be an issue?

No, stop_machine only protects against preempt-disabled regions.

I thought about making that particularly hammer bigger, but noone had
needed it yet.  It would simply require a runtime way of disabling
further preemption and flushing preempted threads (AFAICT there can be
no deadlock issues with this).

Rusty.


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