From: Keir Fraser <keir.fraser@eu.citrix.com>
To: Jan Beulich <jbeulich@novell.com>
Cc: xen-devel@lists.xensource.com
Subject: Re: long latency of domain shutdown
Date: Thu, 08 May 2008 11:12:12 +0100 [thread overview]
Message-ID: <C448908C.20667%keir.fraser@eu.citrix.com> (raw)
In-Reply-To: <4822EAE1.76E4.0078.0@novell.com>
On 8/5/08 10:58, "Jan Beulich" <jbeulich@novell.com> wrote:
> While looking at this I wondered whether there really is a way for
> Xen heap pages to end up being guest page tables (or similarly
> descriptor table ones)? I would think if that happened this would be
> a bug (and perhaps a security issue). If it cannot happen, then the
> RELMEM_* states could be simplified and
> domain_relinquish_resources() shortened.
You mean just force page-table type counts to zero, and drop main reference
count by the same amount? Might work. Would need some thought.
8500 cycles per pte is pretty fantastic. I suppose a few atomic ops are
involved. Are you running on an old P4? :-)
-- Keir
next prev parent reply other threads:[~2008-05-08 10:12 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <48189781.76E4.0078.0@novell.com>
[not found] ` <C43E4040.2022A%keir.fraser@eu.citrix.com>
2008-05-08 9:58 ` long latency of domain shutdown Jan Beulich
2008-05-08 10:12 ` Keir Fraser [this message]
2008-05-08 10:39 ` Jan Beulich
2008-05-08 10:52 ` Keir Fraser
2008-05-08 11:13 ` Jan Beulich
2008-05-08 12:11 ` Keir Fraser
2008-05-08 12:33 ` Jan Beulich
2008-05-08 12:36 ` Keir Fraser
2008-05-08 14:29 ` Jan Beulich
2008-05-08 14:38 ` Keir Fraser
2008-05-09 10:23 ` Jan Beulich
2008-05-09 10:29 ` Keir Fraser
2008-04-28 13:45 Jan Beulich
2008-04-28 13:59 ` Keir Fraser
2008-04-28 14:30 ` Jan Beulich
2008-04-28 14:42 ` Keir Fraser
2008-05-14 15:54 ` Jan Beulich
2008-05-14 16:05 ` Jan Beulich
2008-05-14 16:08 ` Keir Fraser
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