Re: [Xen-devel] [PATCH 2 of 4] x86: Introduce "top_of_mem"

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 09.03.12 at 17:46, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
> On 09/03/12 15:43, Jan Beulich wrote:
>>>>> On 09.03.12 at 15:42, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
>>> It is very useful for the crashdump kernel to have an idea of what Xen
>>> thought was the maximum memory address was, especially if the
>>> crashdump kernel is 32bit.
>> But then you also need to update the value upon memory hotplug.
>> (And I assume subsequent patches will actually make use of this.)
> 
> Where/how does memory hotplug get exposed then?  A cursory look in mm.c
> has references to hotplug in the init paths.

xen/arch/x86/x86_64/mm.c:memory_add() & Co.

Jan


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