Commit 7f2bd006 authored Mar 17, 2016 by Li Zhang Committed by Linus Torvalds Mar 17, 2016

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>

parent 987b3095

arch/powerpc/Kconfig

+1 −0

Original line number	Diff line number	Diff line
		@@ -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

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