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From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Vlastimil Babka <vbabka@suse.cz>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Michal Hocko <mhocko@kernel.org>,
	linux-arch@vger.kernel.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [PATCHv4 01/12] asm-generic: Provide generic_pmdp_establish()
Date: Wed, 13 Dec 2017 13:57:45 +0300	[thread overview]
Message-ID: <20171213105756.69879-2-kirill.shutemov@linux.intel.com> (raw)
In-Reply-To: <20171213105756.69879-1-kirill.shutemov@linux.intel.com>

This is an implementation of pmdp_establish() that is only suitable for
an architecture that doesn't have hardware dirty/accessed bits. In this
case we can't race with CPU which sets these bits and non-atomic
approach is fine.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
 include/asm-generic/pgtable.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index b234d54f2cb6..ae83b14200b8 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -309,6 +309,21 @@ extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
 extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
 #endif
 
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+/*
+ * This is an implementation of pmdp_establish() that is only suitable for an
+ * architecture that doesn't have hardware dirty/accessed bits. In this case we
+ * can't race with CPU which sets these bits and non-atomic aproach is fine.
+ */
+static inline pmd_t generic_pmdp_establish(struct vm_area_struct *vma,
+		unsigned long address, pmd_t *pmdp, pmd_t pmd)
+{
+	pmd_t old_pmd = *pmdp;
+	set_pmd_at(vma->vm_mm, address, pmdp, pmd);
+	return old_pmd;
+}
+#endif
+
 #ifndef __HAVE_ARCH_PMDP_INVALIDATE
 extern void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
 			    pmd_t *pmdp);
-- 
2.15.0

WARNING: multiple messages have this Message-ID (diff)
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Vlastimil Babka <vbabka@suse.cz>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Michal Hocko <mhocko@kernel.org>,
	linux-arch@vger.kernel.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [PATCHv4 01/12] asm-generic: Provide generic_pmdp_establish()
Date: Wed, 13 Dec 2017 13:57:45 +0300	[thread overview]
Message-ID: <20171213105756.69879-2-kirill.shutemov@linux.intel.com> (raw)
In-Reply-To: <20171213105756.69879-1-kirill.shutemov@linux.intel.com>

This is an implementation of pmdp_establish() that is only suitable for
an architecture that doesn't have hardware dirty/accessed bits. In this
case we can't race with CPU which sets these bits and non-atomic
approach is fine.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
 include/asm-generic/pgtable.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index b234d54f2cb6..ae83b14200b8 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -309,6 +309,21 @@ extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
 extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
 #endif
 
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+/*
+ * This is an implementation of pmdp_establish() that is only suitable for an
+ * architecture that doesn't have hardware dirty/accessed bits. In this case we
+ * can't race with CPU which sets these bits and non-atomic aproach is fine.
+ */
+static inline pmd_t generic_pmdp_establish(struct vm_area_struct *vma,
+		unsigned long address, pmd_t *pmdp, pmd_t pmd)
+{
+	pmd_t old_pmd = *pmdp;
+	set_pmd_at(vma->vm_mm, address, pmdp, pmd);
+	return old_pmd;
+}
+#endif
+
 #ifndef __HAVE_ARCH_PMDP_INVALIDATE
 extern void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
 			    pmd_t *pmdp);
-- 
2.15.0

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  reply	other threads:[~2017-12-13 10:59 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-13 10:57 [PATCHv4 00/12] Do not lose dirty bit on THP pages Kirill A. Shutemov
2017-12-13 10:57 ` Kirill A. Shutemov
2017-12-13 10:57 ` Kirill A. Shutemov [this message]
2017-12-13 10:57   ` [PATCHv4 01/12] asm-generic: Provide generic_pmdp_establish() Kirill A. Shutemov
2017-12-13 10:57 ` [PATCHv4 02/12] arc: Use generic_pmdp_establish as pmdp_establish Kirill A. Shutemov
2017-12-13 10:57   ` Kirill A. Shutemov
2017-12-13 10:57 ` [PATCHv4 03/12] arm/mm: Provide pmdp_establish() helper Kirill A. Shutemov
2017-12-13 10:57   ` Kirill A. Shutemov
2017-12-13 10:57 ` [PATCHv4 04/12] arm64: " Kirill A. Shutemov
2017-12-13 10:57   ` Kirill A. Shutemov
2017-12-13 10:57 ` [PATCHv4 05/12] mips: Use generic_pmdp_establish as pmdp_establish Kirill A. Shutemov
2017-12-13 10:57   ` Kirill A. Shutemov
2017-12-13 10:57 ` [PATCHv4 06/12] powerpc/mm: update pmdp_invalidate to return old pmd value Kirill A. Shutemov
2017-12-13 10:57   ` Kirill A. Shutemov
2017-12-13 10:57 ` [PATCHv4 07/12] s390/mm: Modify pmdp_invalidate to return old value Kirill A. Shutemov
2017-12-13 10:57   ` Kirill A. Shutemov
2017-12-13 10:57 ` [PATCHv4 08/12] sparc64: Update pmdp_invalidate() to return old pmd value Kirill A. Shutemov
2017-12-13 10:57   ` Kirill A. Shutemov
2017-12-14  0:06   ` Andrew Morton
2017-12-14  0:06     ` Andrew Morton
2017-12-14  0:06     ` Andrew Morton
2017-12-13 10:57 ` [PATCHv4 09/12] x86/mm: Provide pmdp_establish() helper Kirill A. Shutemov
2017-12-13 10:57   ` Kirill A. Shutemov
2017-12-14  0:09   ` Andrew Morton
2017-12-14  0:09     ` Andrew Morton
2017-12-14  0:33     ` Kirill A. Shutemov
2017-12-14  0:33       ` Kirill A. Shutemov
2017-12-14  0:36       ` Andrew Morton
2017-12-14  0:36         ` Andrew Morton
2017-12-14  0:42         ` Kirill A. Shutemov
2017-12-14  0:42           ` Kirill A. Shutemov
2017-12-15 13:49         ` Kirill A. Shutemov
2017-12-15 13:49           ` Kirill A. Shutemov
2017-12-13 10:57 ` [PATCHv4 10/12] mm: Do not lose dirty and access bits in pmdp_invalidate() Kirill A. Shutemov
2017-12-13 10:57   ` Kirill A. Shutemov
2017-12-13 10:57 ` [PATCHv4 11/12] mm: Use updated pmdp_invalidate() interface to track dirty/accessed bits Kirill A. Shutemov
2017-12-13 10:57   ` Kirill A. Shutemov
2017-12-13 10:57 ` [PATCHv4 12/12] mm/thp: Remove pmd_huge_split_prepare Kirill A. Shutemov
2017-12-13 10:57   ` Kirill A. Shutemov

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