[PATCH -V7 08/18] powerpc: New hugepage directory format
David Gibson
dwg at au1.ibm.com
Tue Apr 30 15:16:34 EST 2013
On Mon, Apr 29, 2013 at 01:07:29AM +0530, Aneesh Kumar K.V wrote:
> From: "Aneesh Kumar K.V" <aneesh.kumar at linux.vnet.ibm.com>
>
> Change the hugepage directory format so that we can have leaf ptes directly
> at page directory avoiding the allocation of hugepage directory.
>
> With the new table format we have 3 cases for pgds and pmds:
> (1) invalid (all zeroes)
> (2) pointer to next table, as normal; bottom 6 bits == 0
> (4) hugepd pointer, bottom two bits == 00, next 4 bits indicate size of table
>
> Instead of storing shift value in hugepd pointer we use mmu_psize_def index
> so that we can fit all the supported hugepage size in 4 bits
>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.vnet.ibm.com>
Looks ok.
Reviewed-by: David Gibson <david at gibson.dropbear.id.au>
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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