linux-kernel - Re: [PATCH] mm: compare MIGRATE

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Date:	Thu, 20 Dec 2012 16:49:44 +0100
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Minchan Kim <minchan@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Minchan Kim <minchan@...nel.org>
Subject: Re: [PATCH] mm: compare MIGRATE_ISOLATE selectively

On Thu, Dec 20 2012, Minchan Kim wrote:
> diff --git a/include/linux/page-isolation.h b/include/linux/page-isolation.h
> index a92061e..4ada4ef 100644
> --- a/include/linux/page-isolation.h
> +++ b/include/linux/page-isolation.h
> @@ -1,6 +1,25 @@
>  #ifndef __LINUX_PAGEISOLATION_H
>  #define __LINUX_PAGEISOLATION_H
>  
> +#ifdef CONFIG_MEMORY_ISOLATION
> +static inline bool page_isolated_pageblock(struct page *page)
> +{
> +	return get_pageblock_migratetype(page) == MIGRATE_ISOLATE;
> +}
> +static inline bool mt_isolated_pageblock(int migratetype)
> +{
> +	return migratetype == MIGRATE_ISOLATE;
> +}

Perhaps “is_migrate_isolate” to match already existing “is_migrate_cma”?
Especially as the “mt_isolated_pageblock” sound confusing to me, it
implies that it works on pageblocks which it does not.

> +#else
> +static inline bool page_isolated_pageblock(struct page *page)
> +{
> +	return false;
> +}
> +static inline bool mt_isolated_pageblock(int migratetype)
> +{
> +	return false;
> +}
> +#endif
>  
>  bool has_unmovable_pages(struct zone *zone, struct page *page, int count,
>  			 bool skip_hwpoisoned_pages);
-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
ooo +----<email/xmpp: mpn@...gle.com>--------------ooO--(_)--Ooo--

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