linux-kernel - Re: [PATCH 2/3] make new alloc_pages

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Message-ID: <1302620653.8321.1725.camel@nimitz>
Date:	Tue, 12 Apr 2011 08:04:13 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Michal Nazarewicz <mina86@...a86.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Timur Tabi <timur@...escale.com>,
	Andi Kleen <andi@...stfloor.org>, Mel Gorman <mel@....ul.ie>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH 2/3] make new alloc_pages_exact()

On Tue, 2011-04-12 at 12:28 +0200, Michal Nazarewicz wrote:
> > Dave Hansen <dave@...ux.vnet.ibm.com> wrote:
> >> +void __free_pages_exact(struct page *page, size_t nr_pages)
> >> +{
> >> +	struct page *end = page + nr_pages;
> >> +
> >> +	while (page < end) {
> >> +		__free_page(page);
> >> +		page++;
> >> +	}
> >> +}
> >> +EXPORT_SYMBOL(__free_pages_exact);
> 
> On Tue, 12 Apr 2011 00:22:23 +0200, Andrew Morton wrote:
> > Really, this function duplicates release_pages().
> 
> It requires an array of pointers to pages which is not great though if one
> just wants to free a contiguous sequence of pages.

Actually, the various mem_map[]s _are_ arrays, at least up to
MAX_ORDER_NR_PAGES at a time.  We can use that property here.

-- Dave

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