linux-kernel - Re: [PATCH][RFC] Add alloc_pages_exact() and free_pages

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Message-ID: <16468.1210773923@vena.lwn.net>
Date:	Wed, 14 May 2008 08:05:23 -0600
From:	corbet@....net (Jonathan Corbet)
To:	Timur Tabi <timur@...escale.com>
Cc:	andi@...stfloor.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][RFC] Add alloc_pages_exact() and free_pages_exact() 

Timur Tabi writes:

> alloc_pages_exact() is similar to alloc_pages(), except that it allocates
> the minimum number of pages to fulfill the request.  This is useful if you
> want to allocate a very large buffer that is slightly larger than an
> even power-of-two number of pages.  In that case, alloc_pages() will waste
> a lot of memory.

FWIW, I wished I had something like this when doing the cafe_ccic
driver.  I can't really attest to the validity of the core VM stuff, but
I will say that the interface is worth having.

Thanks for doing this!

jon
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