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.
Kay
Hi Kay
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.
thanks
zduan
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