Thank you for your reply and what about the kernel thread in the xen hypervisor,are there some instance of kernel threads running in the hypervisor? I am not sure ,but somewhere I read that there is no kernel thread in the xen hypervisor ,is it true or what about it?
Thanks in advance Jeremy Fitzhardinge 写道: > tgh wrote: > >> Thank for your reply >> and I still have several questions >> >> >>> Yes, that's the normal mode of operation. The hypervisor will timeslice >>> multiple vcpus onto a single vcpu. >>> >>> >>> >> that is ,the VM could be preempted by xen,and could xen hypervisor also >> be preempted to reschedule other vm or xen kernel thread?and are there >> the counterpart abstractions in xen for kernel thread in linux? >> >> > > Yes, a vcpu in Xen is the same as a task in the kernel. In the same way > the kernel multiplexes multiple tasks onto your cpu(s), Xen multiplexes > multiple vcpus onto your cpu(s). This isn't directly visible to the > guest kernel, in the same way that user processes can't generally > observe timeslicing. > > >>> This patch doesn't relate to that; it's whether a Xen Linux guest's >>> kernel can be preempted to reschedule processes while running under Xen. >>> >>> >>> >> that is ,the patch makes the guest's kernel, rather than xen, be able to >> be preempted ,is it right? >> >> > > Yes. Previous to that change, kernel preemption was disabled when > compiling Xen support in. > > J > > _______________________________________________ > Xen-devel mailing list > [EMAIL PROTECTED] > http://lists.xensource.com/xen-devel > > > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
