Messages in this thread | | | Date | Sun, 12 Jan 2014 18:46:42 -0500 | From | Prarit Bhargava <> | Subject | Re: [PATCH 2/2] x86, e820 disable ACPI Memory Hotplug if memory mapping is specified by user [v2] |
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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.
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