linux-kernel - [PATCH RFC 2/2] powerpc/mm: Enable page parallel initialisation

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Date:	Thu,  3 Mar 2016 15:01:41 +0800
From:	Li Zhang <zhlcindy@...il.com>
To:	mpe@...erman.id.au, khandual@...ux.vnet.ibm.com,
	aneesh.kumar@...ux.vnet.ibm.com, mgorman@...hsingularity.net
Cc:	linuxppc-dev@...ts.ozlabs.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Li Zhang <zhlcindy@...ux.vnet.ibm.com>
Subject: [PATCH RFC 2/2] powerpc/mm: Enable page parallel initialisation

From: Li Zhang <zhlcindy@...ux.vnet.ibm.com>

Parallel initialisation has been enabled for X86,
boot time is improved greatly.
On Power8, for small memory, it is improved greatly.
Here is the result from my test on Power8 platform:

For 4GB memory: 57% is improved
For 50GB memory: 22% is improve

Signed-off-by: Li Zhang <zhlcindy@...ux.vnet.ibm.com>
---
 arch/powerpc/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index e4824fd..83073c2 100644
--- a/arch/powerpc/Kconfig
+++ b/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
-- 
2.1.0