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From: Liu Ping Fan <kernelfans@gmail.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: Paul Mackerras <paulus@samba.org>
Subject: [PATCH 2/2] powerpc: mm: change pgtable index size for 64K page
Date: Thu, 21 Nov 2013 10:17:55 +0800	[thread overview]
Message-ID: <1385000275-5988-2-git-send-email-pingfank@linux.vnet.ibm.com> (raw)
In-Reply-To: <1385000275-5988-1-git-send-email-pingfank@linux.vnet.ibm.com>

For 64K page, we waste half of the pte_t page. With this patch, after
changing PGD_INDEX_SIZE from 12 to 11, PTE_INDEX_SIZE from 8 to 9,
we can improve the usage of pte_t page and shrink the continuous phys
size for pgd_t.

Signed-off-by: Liu Ping Fan <pingfank@linux.vnet.ibm.com>
---
 arch/powerpc/include/asm/pgtable-ppc64-64k.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/pgtable-ppc64-64k.h b/arch/powerpc/include/asm/pgtable-ppc64-64k.h
index a56b82f..f6955ff 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  8
+#define PTE_INDEX_SIZE  9
 #define PMD_INDEX_SIZE  10
 #define PUD_INDEX_SIZE	0
-#define PGD_INDEX_SIZE  12
+#define PGD_INDEX_SIZE  11
 
 #ifndef __ASSEMBLY__
 #define PTE_TABLE_SIZE	(sizeof(real_pte_t) << PTE_INDEX_SIZE)
-- 
1.8.1.4

  reply	other threads:[~2013-11-21  2:17 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-11-21  2:17 [PATCH 1/2] powerpc: mm: use macro PGTABLE_EADDR_SIZE instead of digital Liu Ping Fan
2013-11-21  2:17 ` Liu Ping Fan [this message]
2013-11-21 22:11   ` [PATCH 2/2] powerpc: mm: change pgtable index size for 64K page Paul Mackerras
2013-11-21 23:46     ` Benjamin Herrenschmidt
2013-11-22  2:06       ` Michael Ellerman
2014-04-30  5:30 ` [PATCH 1/2] powerpc: mm: use macro PGTABLE_EADDR_SIZE instead of digital Aneesh Kumar K.V

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