linux-kernel - Re: [PATCH 3/3] reuse __free_pages_exact() in __alloc_pages

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Date:	Tue, 12 Apr 2011 12:29:53 +0200
From:	"Michal Nazarewicz" <mina86@...a86.com>
To:	linux-mm@...ck.org, "Dave Hansen" <dave@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, "Timur Tabi" <timur@...escale.com>,
	"Andi Kleen" <andi@...stfloor.org>, "Mel Gorman" <mel@....ul.ie>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"David Rientjes" <rientjes@...gle.com>
Subject: Re: [PATCH 3/3] reuse __free_pages_exact() in __alloc_pages_exact()

On Tue, 12 Apr 2011 00:03:48 +0200, Dave Hansen <dave@...ux.vnet.ibm.com>  
wrote:
> diff -puN mm/page_alloc.c~reuse-free-exact mm/page_alloc.c
> --- linux-2.6.git/mm/page_alloc.c~reuse-free-exact	2011-04-11  
> 15:01:17.701822598 -0700
> +++ linux-2.6.git-dave/mm/page_alloc.c	2011-04-11 15:01:17.713822594  
> -0700
> @@ -2338,14 +2338,11 @@ struct page *__alloc_pages_exact(gfp_t g
> 	page = alloc_pages(gfp_mask, order);
>  	if (page) {
> -		struct page *alloc_end = page + (1 << order);
> -		struct page *used = page + nr_pages;
> +		struct page *unused_start = page + nr_pages;
> +		int nr_unused = (1 << order) - nr_pages;

How about unsigned long?

> 		split_page(page, order);
> -		while (used < alloc_end) {
> -			__free_page(used);
> -			used++;
> -		}
> +		__free_pages_exact(unused_start, nr_unused);
>  	}
> 	return page;

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michal "mina86" Nazarewicz    (o o)
ooo +-----<email/xmpp: mnazarewicz@...gle.com>-----ooO--(_)--Ooo--
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