Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751569AbbD3I0E (ORCPT ); Thu, 30 Apr 2015 04:26:04 -0400 Received: from e28smtp08.in.ibm.com ([122.248.162.8]:50940 "EHLO e28smtp08.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750794AbbD3IZ6 (ORCPT ); Thu, 30 Apr 2015 04:25:58 -0400 From: "Aneesh Kumar K.V" To: akpm@linux-foundation.org, paulus@samba.org, benh@kernel.crashing.org, kirill.shutemov@linux.intel.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Aneesh Kumar K.V" Subject: [RFC PATCH 1/3] mm/thp: Use pmdp_splitting_flush_notify to clear pmd on splitting Date: Thu, 30 Apr 2015 13:55:39 +0530 Message-Id: <1430382341-8316-2-git-send-email-aneesh.kumar@linux.vnet.ibm.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1430382341-8316-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> References: <1429823043-157133-1-git-send-email-kirill.shutemov@linux.intel.com> <1430382341-8316-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15043008-0029-0000-0000-0000059D0FE0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2632 Lines: 79 Some arch may require an explicit IPI before a THP PMD split. This ensures that a local_irq_disable can prevent a parallel THP PMD split. So use new function which arch can override Signed-off-by: Aneesh Kumar K.V --- include/asm-generic/pgtable.h | 5 +++++ mm/huge_memory.c | 7 ++++--- mm/pgtable-generic.c | 11 +++++++++++ 3 files changed, 20 insertions(+), 3 deletions(-) diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h index fe617b7e4be6..d091a666f5b1 100644 --- a/include/asm-generic/pgtable.h +++ b/include/asm-generic/pgtable.h @@ -184,6 +184,11 @@ static inline void pmdp_set_wrprotect(struct mm_struct *mm, #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ #endif +#ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH_NOTIFY +extern void pmdp_splitting_flush_notify(struct vm_area_struct *vma, + unsigned long address, pmd_t *pmdp); +#endif + #ifndef __HAVE_ARCH_PGTABLE_DEPOSIT extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, pgtable_t pgtable); diff --git a/mm/huge_memory.c b/mm/huge_memory.c index cce4604c192f..81e9578bf43a 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2606,9 +2606,10 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd, write = pmd_write(*pmd); young = pmd_young(*pmd); - - /* leave pmd empty until pte is filled */ - pmdp_clear_flush_notify(vma, haddr, pmd); + /* + * leave pmd empty until pte is filled. + */ + pmdp_splitting_flush_notify(vma, haddr, pmd); pgtable = pgtable_trans_huge_withdraw(mm, pmd); pmd_populate(mm, &_pmd, pgtable); diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c index 2fe699cedd4d..0fc1f5a06979 100644 --- a/mm/pgtable-generic.c +++ b/mm/pgtable-generic.c @@ -7,6 +7,7 @@ */ #include +#include #include #include @@ -184,3 +185,13 @@ void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, } #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ #endif + +#ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH_NOTIFY +#ifdef CONFIG_TRANSPARENT_HUGEPAGE +void pmdp_splitting_flush_notify(struct vm_area_struct *vma, + unsigned long address, pmd_t *pmdp) +{ + pmdp_clear_flush_notify(vma, address, pmdp); +} +#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ +#endif -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/