The patch titled
Subject: mm: thp: introduce CONFIG_ARCH_ENABLE_THP_MIGRATION
has been added to the -mm tree. Its filename is
mm-thp-introduce-config_arch_enable_thp_migration.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-thp-introduce-config_arch_enable_thp_migration.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-thp-introduce-config_arch_enable_thp_migration.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Subject: mm: thp: introduce CONFIG_ARCH_ENABLE_THP_MIGRATION
Introduce CONFIG_ARCH_ENABLE_THP_MIGRATION to limit thp migration
functionality to x86_64, which should be safer at the first step.
Link: http://lkml.kernel.org/r/20170717193955.20207-5-zi.yan@xxxxxxxx
Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Signed-off-by: Zi Yan <zi.yan@xxxxxxxxxxxxxx>
Reviewed-by: Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: David Nellans <dnellans@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/Kconfig | 4 ++++
include/linux/huge_mm.h | 10 ++++++++++
mm/Kconfig | 3 +++
3 files changed, 17 insertions(+)
diff -puN arch/x86/Kconfig~mm-thp-introduce-config_arch_enable_thp_migration arch/x86/Kconfig
--- a/arch/x86/Kconfig~mm-thp-introduce-config_arch_enable_thp_migration
+++ a/arch/x86/Kconfig
@@ -2291,6 +2291,10 @@ 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
+
menu "Power management and ACPI options"
config ARCH_HIBERNATION_HEADER
diff -puN include/linux/huge_mm.h~mm-thp-introduce-config_arch_enable_thp_migration include/linux/huge_mm.h
--- a/include/linux/huge_mm.h~mm-thp-introduce-config_arch_enable_thp_migration
+++ a/include/linux/huge_mm.h
@@ -233,6 +233,11 @@ void mm_put_huge_zero_page(struct mm_str
#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; })
@@ -336,6 +341,11 @@ static inline struct page *follow_devmap
{
return NULL;
}
+
+static inline bool thp_migration_supported(void)
+{
+ return false;
+}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif /* _LINUX_HUGE_MM_H */
diff -puN mm/Kconfig~mm-thp-introduce-config_arch_enable_thp_migration mm/Kconfig
--- a/mm/Kconfig~mm-thp-introduce-config_arch_enable_thp_migration
+++ a/mm/Kconfig
@@ -262,6 +262,9 @@ 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
_
Patches currently in -mm which might be from n-horiguchi@xxxxxxxxxxxxx are
mm-mempolicy-add-queue_pages_required.patch
mm-x86-move-_page_swp_soft_dirty-from-bit-7-to-bit-1.patch
mm-thp-introduce-separate-ttu-flag-for-thp-freezing.patch
mm-thp-introduce-config_arch_enable_thp_migration.patch
mm-soft-dirty-keep-soft-dirty-bits-over-thp-migration.patch
mm-mempolicy-mbind-and-migrate_pages-support-thp-migration.patch
mm-migrate-move_pages-supports-thp-migration.patch
mm-memory_hotplug-memory-hotremove-supports-thp-migration.patch
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