lkml.org 
[lkml]   [2014]   [Jan]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 2/2] x86, e820 disable ACPI Memory Hotplug if memory mapping is specified by user [v2]


On 01/11/2014 11:35 AM, 7eggert@gmx.de 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.


\
 
 \ /
  Last update: 2014-01-13 01:21    [W:0.148 / U:0.368 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site