From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: benh@kernel.crashing.org, paulus@samba.org
Cc: linuxppc-dev@lists.ozlabs.org,
"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Subject: [PATCH -V4 23/25] powerpc/THP: Enable THP on PPC64
Date: Thu, 21 Mar 2013 01:05:08 +0530 [thread overview]
Message-ID: <1363808110-25748-24-git-send-email-aneesh.kumar@linux.vnet.ibm.com> (raw)
In-Reply-To: <1363808110-25748-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com>
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
We enable only if the we support 16MB page size.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
arch/powerpc/include/asm/pgtable.h | 31 +++++++++++++++++++++++++++++--
1 file changed, 29 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
index 9681de4..5617dee 100644
--- a/arch/powerpc/include/asm/pgtable.h
+++ b/arch/powerpc/include/asm/pgtable.h
@@ -81,8 +81,35 @@ static inline int pmd_trans_huge(pmd_t pmd)
return ((pmd_val(pmd) & PMD_ISHUGE) == PMD_ISHUGE);
}
-/* We will enable it in the last patch */
-#define has_transparent_hugepage() 0
+static inline int has_transparent_hugepage(void)
+{
+ if (!mmu_has_feature(MMU_FTR_16M_PAGE))
+ return 0;
+ /*
+ * We support THP only if HPAGE_SHIFT is 16MB.
+ */
+ if (!HPAGE_SHIFT || (HPAGE_SHIFT != mmu_psize_defs[MMU_PAGE_16M].shift))
+ return 0;
+ /*
+ * We need to make sure that we support 16MB hugepage in a segement
+ * with base page size 64K or 4K. We only enable THP with a PAGE_SIZE
+ * of 64K.
+ */
+ /*
+ * If we have 64K HPTE, we will be using that by default
+ */
+ if (mmu_psize_defs[MMU_PAGE_64K].shift &&
+ (mmu_psize_defs[MMU_PAGE_64K].penc[MMU_PAGE_16M] == -1))
+ return 0;
+ /*
+ * Ok we only have 4K HPTE
+ */
+ if (mmu_psize_defs[MMU_PAGE_4K].penc[MMU_PAGE_16M] == -1)
+ return 0;
+
+ return 1;
+}
+
#else
#define pmd_large(pmd) 0
#define has_transparent_hugepage() 0
--
1.7.10
next prev parent reply other threads:[~2013-03-20 19:35 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-20 19:34 [PATCH -V4 00/25] THP support for PPC64 Aneesh Kumar K.V
2013-03-20 19:34 ` [PATCH -V4 01/25] powerpc: Use signed formatting when printing error Aneesh Kumar K.V
2013-03-20 19:34 ` [PATCH -V4 02/25] powerpc: Save DAR and DSISR in pt_regs on MCE Aneesh Kumar K.V
2013-03-20 19:34 ` [PATCH -V4 03/25] powerpc: Don't hard code the size of pte page Aneesh Kumar K.V
2013-03-20 19:34 ` [PATCH -V4 04/25] powerpc: Reduce the PTE_INDEX_SIZE Aneesh Kumar K.V
2013-03-20 19:34 ` [PATCH -V4 05/25] powerpc: Move the pte free routines from common header Aneesh Kumar K.V
2013-03-20 19:34 ` [PATCH -V4 06/25] powerpc: Reduce PTE table memory wastage Aneesh Kumar K.V
2013-03-20 19:34 ` [PATCH -V4 07/25] powerpc: Use encode avpn where we need only avpn values Aneesh Kumar K.V
2013-03-20 19:34 ` [PATCH -V4 08/25] powerpc: Decode the pte-lp-encoding bits correctly Aneesh Kumar K.V
2013-03-20 19:34 ` [PATCH -V4 09/25] powerpc: Fix hpte_decode to use the correct decoding for page sizes Aneesh Kumar K.V
2013-03-20 19:34 ` [PATCH -V4 10/25] powerpc: print both base and actual page size on hash failure Aneesh Kumar K.V
2013-03-20 19:34 ` [PATCH -V4 11/25] powerpc: Print page size info during boot Aneesh Kumar K.V
2013-03-20 19:34 ` [PATCH -V4 12/25] powerpc: Return all the valid pte ecndoing in KVM_PPC_GET_SMMU_INFO ioctl Aneesh Kumar K.V
2013-03-20 19:34 ` [PATCH -V4 13/25] powerpc: Update tlbie/tlbiel as per ISA doc Aneesh Kumar K.V
2013-03-20 19:34 ` [PATCH -V4 14/25] mm/THP: HPAGE_SHIFT is not a #define on some arch Aneesh Kumar K.V
2013-03-20 19:35 ` [PATCH -V4 15/25] mm/THP: Add pmd args to pgtable deposit and withdraw APIs Aneesh Kumar K.V
2013-03-20 19:35 ` [PATCH -V4 16/25] mm/THP: withdraw the pgtable after pmdp related operations Aneesh Kumar K.V
2013-03-20 19:35 ` [PATCH -V4 17/25] powerpc/THP: Implement transparent hugepages for ppc64 Aneesh Kumar K.V
2013-03-20 19:35 ` [PATCH -V4 18/25] powerpc/THP: Double the PMD table size for THP Aneesh Kumar K.V
2013-03-20 19:35 ` [PATCH -V4 19/25] powerpc/THP: Differentiate THP PMD entries from HUGETLB PMD entries Aneesh Kumar K.V
2013-03-20 19:35 ` [PATCH -V4 20/25] powerpc/THP: Add code to handle HPTE faults for large pages Aneesh Kumar K.V
2013-03-20 19:35 ` [PATCH -V4 21/25] powerpc: Handle hugepage in perf callchain Aneesh Kumar K.V
2013-03-20 19:35 ` [PATCH -V4 22/25] powerpc/THP: get_user_pages_fast changes Aneesh Kumar K.V
2013-03-20 19:35 ` Aneesh Kumar K.V [this message]
2013-03-20 19:35 ` [PATCH -V4 24/25] powerpc: Optimize hugepage invalidate Aneesh Kumar K.V
2013-03-20 19:35 ` [PATCH -V4 25/25] powerpc: Handle hugepages in kvm Aneesh Kumar K.V
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