From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx196.postini.com [74.125.245.196]) by kanga.kvack.org (Postfix) with SMTP id C11426B002F for ; Tue, 26 Feb 2013 03:06:17 -0500 (EST) Received: from /spool/local by e23smtp07.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 26 Feb 2013 17:58:43 +1000 Received: from d23relay03.au.ibm.com (d23relay03.au.ibm.com [9.190.235.21]) by d23dlp02.au.ibm.com (Postfix) with ESMTP id 9E4E22BB0051 for ; Tue, 26 Feb 2013 19:06:11 +1100 (EST) Received: from d23av03.au.ibm.com (d23av03.au.ibm.com [9.190.234.97]) by d23relay03.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r1Q8685I6619624 for ; Tue, 26 Feb 2013 19:06:09 +1100 Received: from d23av03.au.ibm.com (loopback [127.0.0.1]) by d23av03.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r1Q86AOg008941 for ; Tue, 26 Feb 2013 19:06:10 +1100 From: "Aneesh Kumar K.V" Subject: [PATCH -V1 24/24] powerpc/THP: Enable THP on PPC64 Date: Tue, 26 Feb 2013 13:35:14 +0530 Message-Id: <1361865914-13911-25-git-send-email-aneesh.kumar@linux.vnet.ibm.com> In-Reply-To: <1361865914-13911-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> References: <1361865914-13911-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: benh@kernel.crashing.org, paulus@samba.org Cc: linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, "Aneesh Kumar K.V" From: "Aneesh Kumar K.V" We enable only if the we support 16MB page size. Signed-off-by: Aneesh Kumar K.V --- arch/powerpc/include/asm/pgtable.h | 30 ++++++++++++++++++++++++++++-- 1 file changed, 28 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h index 09f3a77..17120c3 100644 --- a/arch/powerpc/include/asm/pgtable.h +++ b/arch/powerpc/include/asm/pgtable.h @@ -107,8 +107,34 @@ 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 huge page 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 && + ((signed int)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; +} static inline pmd_t pmd_mkold(pmd_t pmd) { -- 1.7.10 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org