From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chengyuan Li Subject: Re: Shadow page tables? Date: Sun, 10 Oct 2004 10:52:30 +0800 Sender: xen-devel-admin@lists.sourceforge.net Message-ID: References: Reply-To: Chengyuan Li Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Errors-To: xen-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Keir Fraser Cc: xen-devel@lists.sourceforge.net List-Id: xen-devel@lists.xenproject.org If the shadow pagetable is enabled, Xen will maintain pagetables for every guest process. If 1000 processes are running in the guest, xen will at least allocate 1000 pages as shadow pagetables. Will it consume too many memory frames? On Fri, 08 Oct 2004 10:11:18 +0100, Keir Fraser wrote: > > Currently, shadow p.t.'s are only enabled when migrating OSes between > machines. This allows us to copy the memory image while the OS is > still running, and track which pages are updated after being copied > (and so need to be recopied). > > We intend to flesh out the shadow p.t. code a little mroe to support > full memory virtualisation. It's not there yet, but it won't require > an enormous amount of code to get it going. > > -- Keir > > > > > Hi, > > > > I'm using Xen 2.0 (base kernel is 2.6.8.1) and found that it doesn't > > enable the shadow page tables in Xen though there is code there. > > > > If the shadow page tables are enabled, does it mean that the guest > > Linux' memory management module could be fully virtualized? > > > > Thanks, > > Chengyuan > > > > > > ------------------------------------------------------- > > This SF.net email is sponsored by: IT Product Guide on ITManagersJournal > > Use IT products in your business? Tell us what you think of them. Give us > > Your Opinions, Get Free ThinkGeek Gift Certificates! Click to find out more > > http://productguide.itmanagersjournal.com/guidepromo.tmpl > > _______________________________________________ > > Xen-devel mailing list > > Xen-devel@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/xen-devel > > ------------------------------------------------------- This SF.net email is sponsored by: IT Product Guide on ITManagersJournal Use IT products in your business? Tell us what you think of them. Give us Your Opinions, Get Free ThinkGeek Gift Certificates! Click to find out more http://productguide.itmanagersjournal.com/guidepromo.tmpl