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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@linux.vnet.ibm.com>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Li Zhang 2016-03-17 14:20:19 -07:00 committed by Linus Torvalds
parent 987b3095c2
commit 7f2bd00633
1 changed files with 1 additions and 0 deletions
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arch/powerpc/Kconfig
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@ -158,6 +158,7 @@ config PPC
select ARCH_HAS_DEVMEM_IS_ALLOWED select ARCH_HAS_DEVMEM_IS_ALLOWED
select HAVE_ARCH_SECCOMP_FILTER select HAVE_ARCH_SECCOMP_FILTER
select ARCH_HAS_UBSAN_SANITIZE_ALL select ARCH_HAS_UBSAN_SANITIZE_ALL
select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
config GENERIC_CSUM config GENERIC_CSUM
def_bool CPU_LITTLE_ENDIAN def_bool CPU_LITTLE_ENDIAN