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

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Message-ID: <4DB88AF0.1050501@freescale.com>
Date:	Wed, 27 Apr 2011 16:30:24 -0500
From:	Timur Tabi <timur@...escale.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
CC:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>, Mel Gorman <mel@....ul.ie>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Nazarewicz <mina86@...a86.com>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH 2/3] make new alloc_pages_exact()

Dave Hansen wrote:
> 
> What I really wanted in the end was a highmem-capable
> alloc_pages_exact(), so here it is.  This function can be used to
> allocate unmapped (like highmem) non-power-of-two-sized areas of
> memory.  This is in constast to get_free_pages_exact() which can only
> allocate from lowmem.

Is there an easy way to verify that alloc_pages_exact(5MB) really does allocate
only 5MB and not 8MB?  Is there some kind of function that returns the amount of
unallocated memory, so I can do a diff?

-- 
Timur Tabi
Linux kernel developer at Freescale

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