Re: [PATCH part1 v6 4/6] x86/mem-hotplug: Support initialize page tables in bottom-up

[Zhang Yanfei <zhangyanfei.yes@gmail.com>]

Hello Peter,

On 10/10/2013 07:10 AM, H. Peter Anvin wrote:
> On 10/09/2013 02:45 PM, Zhang Yanfei wrote:
>>>
>>> I would also argue that in the VM scenario -- and arguable even in the
>>> hardware scenario -- the right thing is to not expose the flexible
>>> memory in the e820/EFI tables, and instead have it hotadded (possibly
>>> *immediately* so) on boot.  This avoids both the boot time funnies as
>>> well as the scaling issues with metadata.
>>>
>>
>> So in this kind of scenario, hotpluggable memory will not be detected
>> at boot time, and admin should not use this movable_node boot option
>> and the kernel will act as before, using top-down allocation always.
>>
> 
> Yes.  The idea is that the kernel will boot up without the hotplug
> memory, but if desired, will immediately see a hotplug-add event for the
> movable memory.

Yeah, this is good.

But in the scenario that boot with hotplug memory, we need the movable_node
option. So as tejun has explained a lot about this patchset, do you still
have objection to it or could I ask andrew to merge it into -mm tree for
more tests?

-- 
Thanks.
Zhang Yanfei

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