The patch titled
Subject: powerpc/mm: Enable page parallel initialisation
has been added to the -mm tree. Its filename is
powerpc-mm-enable-page-parallel-initialisation.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/powerpc-mm-enable-page-parallel-initialisation.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/powerpc-mm-enable-page-parallel-initialisation.patch
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------------------------------------------------------
From: Li Zhang <zhlcindy@xxxxxxxxxxxxxxxxxx>
Subject: powerpc/mm: Enable page parallel initialisation
Parallel initialisation has been enabled for X86, boot time is
improved greatly. On Power8, it is improved greatly for small
memory. Here is the result from my test on Power8 platform:
For 4GB of memory, boot time is improved by 59%, from 24.5s to 10s.
For 50GB memory, boot time is improved by 22%, from 56.8s to 43.8s.
Signed-off-by: Li Zhang <zhlcindy@xxxxxxxxxxxxxxxxxx>
Acked-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Acked-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/Kconfig | 1 +
1 file changed, 1 insertion(+)
diff -puN arch/powerpc/Kconfig~powerpc-mm-enable-page-parallel-initialisation arch/powerpc/Kconfig
--- a/arch/powerpc/Kconfig~powerpc-mm-enable-page-parallel-initialisation
+++ a/arch/powerpc/Kconfig
@@ -158,6 +158,7 @@ config PPC
select ARCH_HAS_DEVMEM_IS_ALLOWED
select HAVE_ARCH_SECCOMP_FILTER
select ARCH_HAS_UBSAN_SANITIZE_ALL
+ select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
config GENERIC_CSUM
def_bool CPU_LITTLE_ENDIAN
_
Patches currently in -mm which might be from zhlcindy@xxxxxxxxxxxxxxxxxx are
mm-meminit-initialise-more-memory-for-inode-dentry-hash-tables-in-early-boot.patch
powerpc-mm-enable-page-parallel-initialisation.patch
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