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

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Date:	Tue, 12 Apr 2011 17:58:59 +0200
From:	"Michal Nazarewicz" <mina86@...a86.com>
To:	"Dave Hansen" <dave@...ux.vnet.ibm.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, 12 Apr 2011 17:04:13 +0200, Dave Hansen <dave@...ux.vnet.ibm.com>  
wrote:

> 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.

In that case, waiting eagerly for the new patch. :)

-- 
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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