[PATCH 2/2] fadump: Disable deferred page struct initialisation

Michael Ellerman mpe at ellerman.id.au
Wed Aug 3 21:34:11 AEST 2016

Vlastimil Babka <vbabka at suse.cz> writes:

> On 08/03/2016 07:20 AM, Balbir Singh wrote:
>> On Tue, 2016-08-02 at 18:49 +0530, Srikar Dronamraju wrote:
>>> Fadump kernel reserves significant number of memory blocks. On a multi-node
>>> machine, with CONFIG_DEFFERRED_STRUCT_PAGE support, fadump kernel fails to
>>> boot. Fix this by disabling deferred page struct initialisation.
>> How much memory does a fadump kernel need? Can we bump up the limits depending
>> on the config. I presume when you say fadump kernel you mean kernel with
>> FADUMP in the config?
>> BTW, I would much rather prefer a config based solution that does not select
>> DEFERRED_INIT if FADUMP is enabled.
> IIRC the kdump/fadump kernel is typically the same vmlinux as the main 
> kernel, just with special initrd and boot params. So if you want 
> deferred init for the main kernel, this would be impractical.

Yes. Distros won't build a separate kernel, so it has to work at runtime.


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