linux-kernel - Re: [PATCH 1/9] mm: move some functions from memory_hotplug.c to page

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Date:	Fri, 14 Oct 2011 16:23:19 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Marek Szyprowski <m.szyprowski@...sung.com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-media@...r.kernel.org, linux-mm@...ck.org,
	linaro-mm-sig@...ts.linaro.org,
	Michal Nazarewicz <mina86@...a86.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Ankita Garg <ankita@...ibm.com>,
	Daniel Walker <dwalker@...eaurora.org>,
	Mel Gorman <mel@....ul.ie>, Arnd Bergmann <arnd@...db.de>,
	Jesse Barker <jesse.barker@...aro.org>,
	Jonathan Corbet <corbet@....net>,
	Shariq Hasnain <shariq.hasnain@...aro.org>,
	Chunsang Jeong <chunsang.jeong@...aro.org>,
	Dave Hansen <dave@...ux.vnet.ibm.com>
Subject: Re: [PATCH 1/9] mm: move some functions from memory_hotplug.c to
 page_isolation.c

On Thu, 06 Oct 2011 15:54:41 +0200
Marek Szyprowski <m.szyprowski@...sung.com> wrote:

> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
> Memory hotplug is a logic for making pages unused in the specified
> range of pfn. So, some of core logics can be used for other purpose
> as allocating a very large contigous memory block.
> 
> This patch moves some functions from mm/memory_hotplug.c to
> mm/page_isolation.c. This helps adding a function for large-alloc in
> page_isolation.c with memory-unplug technique.
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> [m.nazarewicz: reworded commit message]
> Signed-off-by: Michal Nazarewicz <m.nazarewicz@...sung.com>
> Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
> [m.szyprowski: rebased and updated to Linux v3.0-rc1]
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> CC: Michal Nazarewicz <mina86@...a86.com>
> Acked-by: Arnd Bergmann <arnd@...db.de>
>
> ...
>
> +/*
> + * For migration.
> + */
> +
> +int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn);

This is a rather poor function name.  Given that we're now making it a
global identifier, perhaps we should give it a better name. 
pages_in_single_zone()?

> +unsigned long scan_lru_pages(unsigned long start, unsigned long end);
> +int do_migrate_range(unsigned long start_pfn, unsigned long end_pfn);
>  
>
> ...
>
> --- a/mm/page_isolation.c
> +++ b/mm/page_isolation.c
> @@ -5,6 +5,9 @@
>  #include <linux/mm.h>
>  #include <linux/page-isolation.h>
>  #include <linux/pageblock-flags.h>
> +#include <linux/memcontrol.h>
> +#include <linux/migrate.h>
> +#include <linux/mm_inline.h>
>  #include "internal.h"
>  
>  static inline struct page *
> @@ -139,3 +142,114 @@ int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn)
>  	spin_unlock_irqrestore(&zone->lock, flags);
>  	return ret ? 0 : -EBUSY;
>  }
> +
> +
> +/*
> + * Confirm all pages in a range [start, end) is belongs to the same zone.

It would be good to fix up that sentence while we're touching it. 
"Confirm that all pages ...  belong to the same zone".

>
> ...
>
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