From: "Joel Fernandes (Google)" <joel@xxxxxxxxxxxxxxxxx> Subject: mm: select HAVE_MOVE_PMD on x86 for faster mremap 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. Link: http://lkml.kernel.org/r/20181108181201.88826-4-joelaf@xxxxxxxxxx Signed-off-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx> Suggested-by: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx> Acked-by: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx> Cc: Julia Lawall <Julia.Lawall@xxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxxxx> Cc: William Kucharski <william.kucharski@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- arch/x86/Kconfig | 1 + 1 file changed, 1 insertion(+) --- a/arch/x86/Kconfig~mm-select-have_move_pmd-in-x86-for-faster-mremap +++ a/arch/x86/Kconfig @@ -172,6 +172,7 @@ 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 _
