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[-next,3/3] mm: select HAVE_MOVE_PMD in x86 for faster mremap

Message ID 20181103040041.7085-4-joelaf@google.com
State Superseded
Headers show
Series Add support for fast mremap | expand

Commit Message

Joel Fernandes Nov. 3, 2018, 4 a.m. UTC 
From: "Joel Fernandes (Google)" <joel@joelfernandes.org>

Moving page-tables at the PMD-level on x86 is known to be safe. Enable
this option so that we can do fast mremap when possible.

Suggested-by: Kirill A. Shutemov <kirill@shutemov.name>
Acked-by: Kirill A. Shutemov <kirill@shutemov.name>
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
---
 arch/x86/Kconfig | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index ba7e3464ee92..48aef01a0bd1 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -173,6 +173,7 @@  config X86
 	select HAVE_MEMBLOCK_NODE_MAP
 	select HAVE_MIXED_BREAKPOINTS_REGS
 	select HAVE_MOD_ARCH_SPECIFIC
+	select HAVE_MOVE_PMD
 	select HAVE_NMI
 	select HAVE_OPROFILE
 	select HAVE_OPTPROBES