On Tue, Sep 2, 2014 at 8:12 AM, Zhenzhong Duan <zhenzhong.d...@oracle.com> wrote: > On 2014-9-2 13:55, Kay Sievers wrote: >> >> On Tue, Sep 2, 2014 at 5:22 AM, Zhenzhong Duan >> <zhenzhong.d...@oracle.com> wrote: >>> >>> Cpu doesn't get online automaticly after hotplug when we test guest cpu >>> add/remove in xen env. >>> >>> I don't have an baremetal env to test this, but I think it's same. >>> >>> The rule is missed in systemd but exist in legacy udev. >> >> Udev is not a mechanism to establish an unconditional loop from the >> kernel back to the kernel. Such rule makes no sense and we never >> shipped that and will not ship it upstream now. >> >> If a device should be unconditionally change its state, the kernel >> should just do that on its own, and not rely on userspace to do that.
> Thanks for your suggestion. Maybe we should add this patch in our internal > branch. > > In fact, kernel does expect user level to control online/offline of cpus. > There are two step to make a cpu online, 1. plug it, 2. online it. > > Plug doesn't have to be followed by online op. But you rule does that unconditionally. Shipping such things in udev rules makes no sense. Kay _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
