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Groups > linux.kernel > #1599538

[PATCH v4 04/11] mm: thp: introduce CONFIG_ARCH_ENABLE_THP_MIGRATION

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From: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>

Introduces CONFIG_ARCH_ENABLE_THP_MIGRATION to limit thp migration
functionality to x86_64, which should be safer at the first step.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
---
v1 -> v2:
- fixed config name in subject and patch description
---
 arch/x86/Kconfig        |  4 ++++
 include/linux/huge_mm.h | 10 ++++++++++
 mm/Kconfig              |  3 +++
 3 files changed, 17 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 69188841717a..a24bc11c7aed 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2276,6 +2276,10 @@ config ARCH_ENABLE_HUGEPAGE_MIGRATION
 	def_bool y
 	depends on X86_64 && HUGETLB_PAGE && MIGRATION
 
+config ARCH_ENABLE_THP_MIGRATION
+	def_bool y
+	depends on X86_64 && TRANSPARENT_HUGEPAGE && MIGRATION
+
 menu "Power management and ACPI options"
 
 config ARCH_HIBERNATION_HEADER
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index a3762d49ba39..1b81cb57ff0f 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -212,6 +212,11 @@ void mm_put_huge_zero_page(struct mm_struct *mm);
 
 #define mk_huge_pmd(page, prot) pmd_mkhuge(mk_pmd(page, prot))
 
+static inline bool thp_migration_supported(void)
+{
+	return IS_ENABLED(CONFIG_ARCH_ENABLE_THP_MIGRATION);
+}
+
 #else /* CONFIG_TRANSPARENT_HUGEPAGE */
 #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
 #define HPAGE_PMD_MASK ({ BUILD_BUG(); 0; })
@@ -306,6 +311,11 @@ static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,
 {
 	return NULL;
 }
+
+static inline bool thp_migration_supported(void)
+{
+	return false;
+}
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 
 #endif /* _LINUX_HUGE_MM_H */
diff --git a/mm/Kconfig b/mm/Kconfig
index 9b8fccb969dc..317a2f973720 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -289,6 +289,9 @@ config MIGRATION
 config ARCH_ENABLE_HUGEPAGE_MIGRATION
 	bool
 
+config ARCH_ENABLE_THP_MIGRATION
+	bool
+
 config PHYS_ADDR_T_64BIT
 	def_bool 64BIT || ARCH_PHYS_ADDR_T_64BIT
 
-- 
2.11.0

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[PATCH v4 00/11] mm: page migration enhancement for thp Zi Yan <zi.yan@sent.com> - 2017-03-13 16:50 +0100
  [PATCH v4 09/11] mm: mempolicy: mbind and migrate_pages support thp migration Zi Yan <zi.yan@sent.com> - 2017-03-13 16:50 +0100
  [PATCH v4 08/11] mm: hwpoison: soft offline supports thp migration Zi Yan <zi.yan@sent.com> - 2017-03-13 16:50 +0100
  [PATCH v4 05/11] mm: thp: enable thp migration in generic path Zi Yan <zi.yan@sent.com> - 2017-03-13 16:50 +0100
    Re: [PATCH v4 05/11] mm: thp: enable thp migration in generic path kbuild test robot <lkp@intel.com> - 2017-03-14 22:30 +0100
      Re: [PATCH v4 05/11] mm: thp: enable thp migration in generic path Geert Uytterhoeven <geert@linux-m68k.org> - 2017-03-15 10:10 +0100
    Re: [PATCH v4 05/11] mm: thp: enable thp migration in generic path "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-03-24 15:30 +0100
  [PATCH v4 10/11] mm: migrate: move_pages() supports thp migration Zi Yan <zi.yan@sent.com> - 2017-03-13 16:50 +0100
  [PATCH v4 01/11] mm: x86: move _PAGE_SWP_SOFT_DIRTY from bit 7 to bit 1 Zi Yan <zi.yan@sent.com> - 2017-03-13 16:50 +0100
    Re: [PATCH v4 01/11] mm: x86: move _PAGE_SWP_SOFT_DIRTY from bit 7  to bit 1 Tim Chen <tim.c.chen@linux.intel.com> - 2017-03-24 19:30 +0100
  [PATCH v4 04/11] mm: thp: introduce CONFIG_ARCH_ENABLE_THP_MIGRATION Zi Yan <zi.yan@sent.com> - 2017-03-13 16:50 +0100
    Re: [PATCH v4 04/11] mm: thp: introduce  CONFIG_ARCH_ENABLE_THP_MIGRATION "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-03-24 15:20 +0100
  [PATCH v4 07/11] mm: soft-dirty: keep soft-dirty bits over thp migration Zi Yan <zi.yan@sent.com> - 2017-03-13 16:50 +0100

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