Re: [PATCH 2/2] x86, e820 disable ACPI Memory Hotplug if memory mappingis specified by user [v2]

[Prarit Bhargava]

On 01/11/2014 11:35 AM, 7eggert@xxxxxx wrote:
> 
> 
> On Fri, 10 Jan 2014, Prarit Bhargava wrote:
> 
>> kdump uses memmap=exactmap and mem=X values to configure the memory
>> mapping for the kdump kernel.  If memory is hotadded during the boot of
>> the kdump kernel it is possible that the page tables for the new memory
>> cause the kdump kernel to run out of memory.
>>
>> Since the user has specified a specific mapping ACPI Memory Hotplug should be
>> disabled in this case.
> 
> I'll ask just in case: Is it possible to want memory hotplug in spite of 
> using memmap=exactmap or mem=X?

Good question -- I can't think of a case.  When a user specifies "memmap" or
"mem" IMO they are asking for a very specific memory configuration.  Having
extra memory added above what the user has specified seems to defeat the purpose
of "memmap" and "mem".

P.
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