Patchwork [RFC,2/3] arch/powerpc: Reduce the PTE_INDEX_SIZE

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Submitter Aneesh Kumar K.V
Date Jan. 30, 2013, 1:18 p.m.
Message ID <1359551916-10321-3-git-send-email-aneesh.kumar@linux.vnet.ibm.com>
Download mbox | patch
Permalink /patch/216906/
State Not Applicable
Headers show

Comments

Aneesh Kumar K.V - Jan. 30, 2013, 1:18 p.m.
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>

This make one PMD cover 16MB range. That helps in easier implementation of THP
on power. THP core code make use of one pmd entry to track the huge page and
the range mapped by a single pmd entry should be equal to the huge page size
supported by the hardware.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
 arch/powerpc/include/asm/pgtable-ppc64-64k.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Patch

diff --git a/arch/powerpc/include/asm/pgtable-ppc64-64k.h b/arch/powerpc/include/asm/pgtable-ppc64-64k.h
index be4e287..3c529b4 100644
--- a/arch/powerpc/include/asm/pgtable-ppc64-64k.h
+++ b/arch/powerpc/include/asm/pgtable-ppc64-64k.h
@@ -4,10 +4,10 @@ 
 #include <asm-generic/pgtable-nopud.h>
 
 
-#define PTE_INDEX_SIZE  12
+#define PTE_INDEX_SIZE  8
 #define PMD_INDEX_SIZE  12
 #define PUD_INDEX_SIZE	0
-#define PGD_INDEX_SIZE  6
+#define PGD_INDEX_SIZE  10
 
 #ifndef __ASSEMBLY__
 #define PTE_TABLE_SIZE	(sizeof(real_pte_t) << PTE_INDEX_SIZE)