From: Olaf Hering <olaf@aepfle.de>
To: Tim Deegan <tim@xen.org>
Cc: xen-devel@lists.xensource.com,
Andres Lagar-Cavilla <andres@lagarcavilla.org>
Subject: Re: mark pages in p2m_ram_paging_out state read-only
Date: Thu, 24 Nov 2011 19:24:15 +0100 [thread overview]
Message-ID: <20111124182415.GA24717@aepfle.de> (raw)
In-Reply-To: <20111124172215.GQ77868@ocelot.phlegethon.org>
On Thu, Nov 24, Tim Deegan wrote:
> > Is this a good idea? If the guest is accessing the page, then paging out
> > should stop immediately. We're risking complex races for a tiny tiny gain.
>
> I don't think that this would introduce any new races, but yes - this is
> probably a hint that this page is a poor candidate to be paged out.
> We might as well abandon the page-out rather than probably having to
> page it back in immediately.
In the current state there will be a stall in the guest due to the
fault, until the page comes back.
With this change the guest can still make progress.
Can the read-execute access be detected anyway to stop paging?
next prev parent reply other threads:[~2011-11-24 18:24 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.1616.1322135934.12970.xen-devel@lists.xensource.com>
2011-11-24 17:09 ` mark pages in p2m_ram_paging_out state read-only Andres Lagar-Cavilla
2011-11-24 17:22 ` Tim Deegan
2011-11-24 18:24 ` Olaf Hering [this message]
2011-11-24 18:40 ` Olaf Hering
2011-11-24 18:41 ` Andres Lagar-Cavilla
2011-11-14 16:53 Olaf Hering
2011-11-24 11:38 ` Tim Deegan
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