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From: corbet@lwn.net (Jonathan Corbet)
To: Timur Tabi <timur@freescale.com>
Cc: andi@firstfloor.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH][RFC] Add alloc_pages_exact() and free_pages_exact()
Date: Wed, 14 May 2008 08:05:23 -0600	[thread overview]
Message-ID: <16468.1210773923@vena.lwn.net> (raw)
In-Reply-To: Your message of "Tue, 13 May 2008 16:26:46 CDT." <1210714006-8976-1-git-send-email-timur@freescale.com>

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

  reply	other threads:[~2008-05-14 14:05 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-05-13 21:26 [PATCH][RFC] Add alloc_pages_exact() and free_pages_exact() Timur Tabi
2008-05-14 14:05 ` Jonathan Corbet [this message]
2008-05-14 16:03 ` Randy Dunlap

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