[Libvir] [PATCH] Add Xen Scheduler APIs to xenDaemonDriver

Hi, I add the Xen Scheduler APIs to xenDaemonDriver. - xenDaemonGetSchedulerType - xenDaemonGetSchedulerParameters - xenDaemonSetSchedulerParameters We will have the following improvements by this patch: 1) xenDaemonDriver of Schedulr is usable when xenHypervisorDriver failed. 2) Show the Scheduler information with non-root user. 3) Set the Scheduler parameters for inactive domain. (Unfortunately not right now, because we need this fix. http://lists.xensource.com/archives/html/xen-devel/2008-03/msg00301.html) And I have a few things to note: - Currently, implemented for the Xen-credit scheduler only. - xenDaemonGetSchedulerType is supported in xendConfigVersion >= 4, because we can get "xen_scheduler" from xend after Cset13394 of Xen (i.e. xendConfigVersion is four or later). - For the above reason, xenDaemonGetSchedulerParameters and xenDaemonSetSchedulerParameters are also supported in xendConfigVersion >= 4, because they are using xenDaemonGetSchedulerType to get the scheduler type. - At xenDaemonSetSchedulerParameters, there are restrictions which depends on Xend-version. a) We cannot set the "cap" value by xend before Cset15476 of Xen, because xend does not support the "cap" value at xend/server/SrvDomain.py b) We cannot set the scheduler parameters for inactive domain without the following patch. http://lists.xensource.com/archives/html/xen-devel/2008-03/msg00301.html If the above patch is committed, this API will be available for inactive domain. Regards, Saori Fukuta