Re: [PATCH 07/13] mm: meminit: Initialise a subset of struct pages if CONFIG_DEFERRED_STRUCT_PAGE_INIT is set

[Andrew Morton]

On Thu, 23 Apr 2015 11:33:10 +0100 Mel Gorman <mgorman@xxxxxxx> wrote:

> This patch initalises all low memory struct pages and 2G of the highest zone
> on each node during memory initialisation if CONFIG_DEFERRED_STRUCT_PAGE_INIT
> is set. That config option cannot be set but will be available in a later
> patch.  Parallel initialisation of struct page depends on some features
> from memory hotplug and it is necessary to alter alter section annotations.
> 
>  ...
>
> +#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
> +#define __defermem_init __meminit
> +#define __defer_init    __meminit
> +#else
> +#define __defermem_init
> +#define __defer_init __init
> +#endif

Could we get some comments describing these?  What they do, when and
where they should be used.  I have a suspicion that the naming isn't
good, but I didn't spend a lot of time reverse-engineering the
intent...

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