Re: virtually and physically (page) aligned allocation

H. Peter Anvin
2009-02-24T06:32:55Z

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