linux-kernel - Re: [PATCH 07/13] mm: meminit: Initialise a subset of struct pages if CONFIG_DEFERRED_STRUCT_PAGE

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Date:	Mon, 27 Apr 2015 15:43:44 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Linux-MM <linux-mm@...ck.org>, Nathan Zimmer <nzimmer@....com>,
	Dave Hansen <dave.hansen@...el.com>,
	Waiman Long <waiman.long@...com>,
	Scott Norton <scott.norton@...com>,
	Daniel J Blueman <daniel@...ascale.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 07/13] mm: meminit: Initialise a subset of struct pages
 if CONFIG_DEFERRED_STRUCT_PAGE_INIT is set

On Thu, 23 Apr 2015 11:33:10 +0100 Mel Gorman <mgorman@...e.de> 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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