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From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au
Cc: linuxppc-dev@lists.ozlabs.org,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Subject: [PATCH V2 18/31] powerpc/mm: Increase the pte frag size.
Date: Wed, 30 Sep 2015 07:57:11 +0530	[thread overview]
Message-ID: <1443580044-30659-19-git-send-email-aneesh.kumar@linux.vnet.ibm.com> (raw)
In-Reply-To: <1443580044-30659-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com>

We will use the increased size to store more information of 4K pte
when using 64K page size. The idea is to free up bits in pte_t.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
 arch/powerpc/include/asm/pgalloc-64.h | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/powerpc/include/asm/pgalloc-64.h b/arch/powerpc/include/asm/pgalloc-64.h
index d8cde71f6734..4f1cc6c46728 100644
--- a/arch/powerpc/include/asm/pgalloc-64.h
+++ b/arch/powerpc/include/asm/pgalloc-64.h
@@ -164,15 +164,15 @@ static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
 
 #else /* if CONFIG_PPC_64K_PAGES */
 /*
- * we support 16 fragments per PTE page.
+ * we support 8 fragments per PTE page.
  */
-#define PTE_FRAG_NR	16
+#define PTE_FRAG_NR	8
 /*
- * We use a 2K PTE page fragment and another 2K for storing
- * real_pte_t hash index
+ * We use a 2K PTE page fragment and another 4K for storing
+ * real_pte_t hash index. Rounding the entire thing to 8K
  */
-#define PTE_FRAG_SIZE_SHIFT  12
-#define PTE_FRAG_SIZE (2 * PTRS_PER_PTE * sizeof(pte_t))
+#define PTE_FRAG_SIZE_SHIFT  13
+#define PTE_FRAG_SIZE (1UL << PTE_FRAG_SIZE_SHIFT)
 
 extern pte_t *page_table_alloc(struct mm_struct *, unsigned long, int);
 extern void page_table_free(struct mm_struct *, unsigned long *, int);
-- 
2.5.0

  parent reply	other threads:[~2015-09-30  2:29 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-09-30  2:26 [PATCH V2 00/31] powerpc/mm: Update page table format for book3s 64 Aneesh Kumar K.V
2015-09-30  2:26 ` [PATCH V2 01/31] powerpc/mm: move pte headers to book3s directory Aneesh Kumar K.V
2015-09-30  2:26 ` [PATCH V2 02/31] powerpc/mm: move pte headers to book3s directory (part 2) Aneesh Kumar K.V
2015-09-30  2:26 ` [PATCH V2 03/31] powerpc/mm: make a separate copy for book3s Aneesh Kumar K.V
2015-09-30  2:26 ` [PATCH V2 04/31] powerpc/mm: make a separate copy for book3s (part 2) Aneesh Kumar K.V
2015-09-30  2:26 ` [PATCH V2 05/31] powerpc/mm: Move hash specific pte width and other defines to book3s Aneesh Kumar K.V
2015-09-30  2:26 ` [PATCH V2 06/31] powerpc/mm: Delete booke bits from book3s Aneesh Kumar K.V
2015-09-30  2:27 ` [PATCH V2 07/31] powerpc/mm: Don't have generic headers introduce functions touching pte bits Aneesh Kumar K.V
2015-09-30  2:27 ` [PATCH V2 08/31] powerpc/mm: Drop pte-common.h from BOOK3S 64 Aneesh Kumar K.V
2015-09-30  2:27 ` [PATCH V2 09/31] powerpc/mm: Don't use pte_val as lvalue Aneesh Kumar K.V
2015-09-30  2:27 ` [PATCH V2 10/31] powerpc/mm: Don't use pmd_val, pud_val and pgd_val " Aneesh Kumar K.V
2015-09-30  2:27 ` [PATCH V2 11/31] powerpc/mm: Move hash64 PTE bits from book3s/64/pgtable.h to hash.h Aneesh Kumar K.V
2015-09-30  2:27 ` [PATCH V2 12/31] powerpc/mm: Move PTE bits from generic functions to hash64 functions Aneesh Kumar K.V
2015-09-30  2:27 ` [PATCH V2 13/31] powerpc/booke: Move booke headers (part 1) Aneesh Kumar K.V
2015-09-30  2:27 ` [PATCH V2 14/31] powerpc/booke: Move booke headers (part 2) Aneesh Kumar K.V
2015-09-30  2:27 ` [PATCH V2 15/31] powerpc/booke: Move booke headers (part 3) Aneesh Kumar K.V
2015-09-30  2:27 ` [PATCH V2 16/31] powerpc/booke: Move booke headers (part 4) Aneesh Kumar K.V
2015-09-30  2:27 ` [PATCH V2 17/31] powerpc/booke: Move booke headers (part 5) Aneesh Kumar K.V
2015-09-30  2:27 ` Aneesh Kumar K.V [this message]
2015-09-30  2:27 ` [PATCH V2 19/31] powerpc/mm: Convert 4k hash insert to C Aneesh Kumar K.V
2015-09-30 12:07   ` Anshuman Khandual
2015-09-30 20:18     ` Benjamin Herrenschmidt
2015-10-01 13:49       ` Anshuman Khandual
2015-09-30  2:27 ` [PATCH V2 20/31] powerpc/mm: update __real_pte to take address as argument Aneesh Kumar K.V
2015-09-30  2:27 ` [PATCH V2 21/31] powerpc/mm: make pte page hash index slot 8 bits Aneesh Kumar K.V
2015-09-30  2:27 ` [PATCH V2 22/31] powerpc/mm: Don't track subpage valid bit in pte_t Aneesh Kumar K.V
2015-09-30  2:27 ` [PATCH V2 23/31] powerpc/mm: Increase the width of #define Aneesh Kumar K.V
2015-09-30  2:27 ` [PATCH V2 24/31] powerpc/mm: Convert __hash_page_64K to C Aneesh Kumar K.V
2015-09-30  2:27 ` [PATCH V2 25/31] powerpc/mm: Convert 4k insert from asm " Aneesh Kumar K.V
2015-09-30  2:27 ` [PATCH V2 26/31] powerpc/mm: Remove the dependency on pte bit position in asm code Aneesh Kumar K.V
2015-09-30 13:09   ` Anshuman Khandual
2015-09-30  2:27 ` [PATCH V2 27/31] powerpc/mm: Add helper for converting pte bit to hpte bits Aneesh Kumar K.V
2015-09-30  2:27 ` [PATCH V2 28/31] powerpc/mm: Move WIMG update to helper Aneesh Kumar K.V
2015-09-30  2:27 ` [PATCH V2 29/31] powerpc/mm: Move hugetlb related headers Aneesh Kumar K.V
2015-09-30  2:27 ` [PATCH V2 30/31] powerpc/mm: Move THP headers around Aneesh Kumar K.V
2015-09-30  2:27 ` [PATCH V2 31/31] powerpc/mm: Add a _PAGE_PTE bit Aneesh Kumar K.V

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