[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH 00/18] xenpaging changes for 4.0
On Fri, Oct 15, Dan Magenheimer wrote: > Hi Olaf -- > > Since you have obviously become an expert user of xenpaging, > any chance you could write brief how-to documentation for it > and maybe add a file to xen.hg/docs/misc? This is a first draft. Subject: xenpaging: (sparse) documenation Write up some sparse documentation about xenpaging usage. Signed-off-by: Olaf Hering <olaf@xxxxxxxxx> --- docs/misc/xenpaging.txt | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) --- /dev/null +++ xen-4.0.1-testing/docs/misc/xenpaging.txt @@ -0,0 +1,40 @@ +Warning: + +The xenpaging code is new and not fully debugged. +Usage of xenpaging can crash Xen or cause severe data corruption in the +guest memory and its filesystems! + +Description: + +xenpaging writes memory pages of a given guest to a file and moves the +page back to the pool of available memory. Once the guests wants to +access the paged-out memory, the page is read from disk and placed into +memory. This allows the sum of all running guests to use more memory +than physically available on the host. + +Usage: + +Once the guest is running, run xenpaging with the guest_id and the +number of pages to page-out: + + mkdir /var/lib/xen/xenpaging + chdir /var/lib/xen/xenpaging + xenpaging <guest_id> <number_of_pages> + +To obtain the guest_id, run 'xm list'. +xenpaging will write the pagefile to the current directory. +Example with 128MB pagefile on guest 1: + + xenpaging 1 32768 + +Caution: stopping xenpaging manually will cause the guest to stall or +crash because the paged-out memory is not written back into the guest! + + + +Todo: +- implement stopping of xenpaging +- implement/test live migration + + +# vim: tw=72 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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