linux-kernel - Re: virtually and physically (page) aligned allocation

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Message-ID: <49A39489.3090202@zytor.com>
Date:	Mon, 23 Feb 2009 22:32:41 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Parav Pandit <paravpandit@...oo.com>
CC:	Linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: virtually and physically (page) aligned allocation

Parav Pandit wrote:
> Hi,
> 
> Can user space application allocate memory which is virtually and physically aligned to the system's page boundary in the Linux 2.6.x?
> Such as using posix_memalign().
> 
> In other way,
> If user space application allocates memory which is aligned to page boundary for say 4 pages using posix_memalign(), will is ensure that it corresponds to exactly 4 physical pages in kernel which can be pinned down?
> 

You can use hugetlbfs to allocate a 2 MB page, otherwise no.

	-hpa

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