The commit is pushed to "branch-rh8-4.18.0-240.1.1.vz8.5.x-ovz" and will appear
at https://src.openvz.org/scm/ovz/vzkernel.git
after rh8-4.18.0-240.1.1.vz8.5.40
------>
commit 08468bdadbe7042787f9c2e8d6cbd6e2e266be90
Author: Joel Fernandes (Google) <[email protected]>
Date: Fri Jun 11 15:08:02 2021 +0300
ms/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/[email protected]
Signed-off-by: Joel Fernandes (Google) <[email protected]>
Suggested-by: Kirill A. Shutemov <[email protected]>
Acked-by: Kirill A. Shutemov <[email protected]>
Cc: Julia Lawall <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: William Kucharski <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
(cherry picked from commit 9f132f7e145506efc0744426cb338b18a54afc3b)
Signed-off-by: Kirill Tkhai <[email protected]>
Patchset description:
Patch "mm: speed up mremap by 20x on large regions" introduces
optimization: when a moved region has source and destination addresses
and size equal to multiple of PMD_SIZE; PTEs are not really copyed.
Instead of this, new PMD pointer is changed to point to old PTEs, while
old PMD is cleared.
This may be useful, when CRIU remaps large memory areas on restore (but
really, alignment to PMD_SIZE is not very often, though possible).
(cherry-picked from ms 9f132f7e145506efc0744426cb338b18a54afc3b)
Signed-off-by: Andrey Zhadchenko <[email protected]>
---
arch/x86/Kconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index d90d31ecd054..fb2207657707 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -186,6 +186,7 @@ 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
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