-----邮件原件-----
发件人: Jan Beulich [mailto:jbeul...@suse.com]
发送时间: 2015年7月7日 18:54
收件人: Fanhenglong
抄送: Hanweidong (Randy); Huangpeng (Peter); Yanqiangjun; xen-devel@lists.xen.org
主题: Re: 答复: [Xen-devel] [PATCH]xen new latest version mp_register_lapic can't
register disabled CPU, patch attempt to fix
>>> On 07.07.15 at 12:23, <fanhengl...@huawei.com> wrote:
Please don't top post.
> I payed attention to the appearance, beause my host start and trigger
> the following code and printk logs printk("%sAPIC ID %#x and/or ACPI
> ID %#x beyond limit"
> " - processor ignored\n",
> processor->lapic_flags & ACPI_MADT_ENABLED ?
> KERN_WARNING "WARNING: " : KERN_INFO,
> processor->local_apic_id, processor->uid);
>
>
> after refered to the below comment in function acpi_parse_x2apic of
> xen latest version
> /*
> * We need to register disabled CPU as well to permit
> * counting disabled CPUs. This allows us to size
> * cpus_possible_map more accurately, to permit
> * to not preallocating memory for all NR_CPUS
> * when we use CPU hotplug.
> */
> mp_register_lapic(processor->local_apic_id, enabled, 0);
>
>
> and compared with linux4.1 function acpi_parse_x2apic, this patch will
> be useful if xen host support CPU hotplug in the future,
> But then mp_register_lapic() shouldn't be called with an out-of- range LAPIC
> ID. I.e. I think if you wanted to address this concern of yours, a more
> extensive change would be needed.
Now, xen host can not support cpu hotplug,
I also think it is only not essential optimization,
Thanks
Henglong Fan
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