Re: [discuss] Re: [RFC:PATCH(003/003)] Memory add to onlined node. (ver. 2) (For x86_64)
From: Yasunori Goto
Date: Thu Feb 09 2006 - 05:55:44 EST
> On Thursday 09 February 2006 10:50, Yasunori Goto wrote:
> > Current code adds memory to ZONE_NORMAL like this.
> > But, ZONE_DMA32 is available on 2.6.15. So, I'm afraid there are
> > 2 types trouble.
> > a) When new memory is added to < 4GB, this should be added to
> > Zone_DMA32.
> > Are there any real machine which allow to add memory under
> > 4GB?
> x86-64 machines usually use a continuous memory map
> because Windows gets unhappy with too big memory holes (and even
> Linux is not completely troublefree for UP install kernels) And for a small
> system this implies memory < 4GB.
Ah, Ok. Then, it is bug. :-P
> > b) If machine boots up with under 4GB memory, and new memory
> > is added to over 4GB, then kernel might panic due to Zone Normal's
> > initialization is imcomplete.
> > Q2)
> > Are there any real machine which can add memory with NUMA feature?
> There are and will be.
I see. I'll continue my job with x86_64 too. :-)
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