From: Keir Fraser <keir.fraser@eu.citrix.com>
To: Dave McCracken <dcm@mccr.org>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>,
Xen Developers List <xen-devel@lists.xensource.com>
Subject: Re: [PATCH] Add hypercall to mark superpages to improve performance
Date: Fri, 30 Apr 2010 14:30:11 -0700 [thread overview]
Message-ID: <C80099F3.1198F%keir.fraser@eu.citrix.com> (raw)
In-Reply-To: <201004301443.23350.dcm@mccr.org>
On 30/04/2010 12:43, "Dave McCracken" <dcm@mccr.org> wrote:
>> Secondly, I don't really believe that the mark/unmark
>> hypercalls are race-free -- bearing in mind, that other mappings (superpage
>> or otherwise) can be constructed or deleted in parallel on other cpus.
>
> I'll look into what can be done to prevent races. I suspect some races we
> don't care about.
I mean I think there are probably races that can result in inconsistent
reference counts. I reckon I'll be able to find some when I'm back from
travelling next week. Obviously, any such race would be unacceptable.
-- Keir
next prev parent reply other threads:[~2010-04-30 21:30 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-28 14:33 [PATCH] Add hypercall to mark superpages to improve performance Dave McCracken
2010-04-28 6:58 ` Keir Fraser
2010-04-30 19:43 ` Dave McCracken
2010-04-30 21:30 ` Keir Fraser [this message]
2010-04-30 22:10 ` Keir Fraser
2010-04-30 21:34 ` Keir Fraser
2010-04-30 21:43 ` Dave McCracken
2010-04-30 22:03 ` Keir Fraser
2010-05-02 21:34 ` Dave McCracken
2010-05-02 23:54 ` Keir Fraser
2010-05-03 0:03 ` Keir Fraser
2010-05-03 1:55 ` Dave McCracken
2010-05-03 16:09 ` Keir Fraser
2010-05-03 16:29 ` Keir Fraser
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