Re: [RFC 0/2] Delay initializing of large sections of memory

[Mike Travis]

On 6/21/2013 11:50 AM, Greg KH wrote:
> On Fri, Jun 21, 2013 at 11:44:22AM -0700, Yinghai Lu wrote:
>> On Fri, Jun 21, 2013 at 10:03 AM, H. Peter Anvin <hpa@xxxxxxxxx> wrote:
>>> On 06/21/2013 09:51 AM, Greg KH wrote:
>>>
>>> I suspect the cutoff for this should be a lot lower than 8 TB even, more
>>> like 128 GB or so.  The only concern is to not set the cutoff so low
>>> that we can end up running out of memory or with suboptimal NUMA
>>> placement just because of this.
>>
>> I would suggest another way:
>> only boot the system with boot node (include cpu, ram and pci root buses).
>> then after boot, could add other nodes.
> 
> What exactly do you mean by "after boot"?  Often, the boot process of
> userspace needs those additional cpus and ram in order to initialize
> everything (like the pci devices) properly.

Exactly.  That's why I left both low and high memory on each node.

> 
> thanks,
> 
> greg k-h
> 
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