[PATCH 2/2] powerpc/mm: Enable page parallel initialisation

From	Li Zhang <zhlcindy@gmail.com>
Newsgroups	linux.kernel
Subject	[PATCH 2/2] powerpc/mm: Enable page parallel initialisation
Date	2016-03-08 05:00 +0100
Message-ID	<ragYp-3PN-1@gated-at.bofh.it> (permalink)
References	<ragYp-3PN-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

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

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 memory: 57% is improved, boot time as the following:
with patch: 10s, without patch: 24.5s

For 50GB memory: 22% is improved, boot time as the following:
with patch: 43.8s, without patch: 56.8s

Acked-by: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Li Zhang <zhlcindy@linux.vnet.ibm.com>
---
 * Add boot time details in change log.
 * Please apply this patch after [PATCH 1/2] mm: meminit: initialise
    more memory for inode/dentry hash tables in early boot, because
   [PATCH 1/2] is to fix a bug which can be reproduced on Power.

 arch/powerpc/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 9faa18c..97d41ad 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

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

[PATCH 2/2] powerpc/mm: Enable page parallel initialisation Li Zhang <zhlcindy@gmail.com> - 2016-03-08 05:00 +0100
  Re: [PATCH 2/2] powerpc/mm: Enable page parallel initialisation Michael Ellerman <mpe@ellerman.id.au> - 2016-03-08 10:40 +0100
    Re: [PATCH 2/2] powerpc/mm: Enable page parallel initialisation Li Zhang <zhlcindy@gmail.com> - 2016-03-09 03:10 +0100
    Re: [PATCH 2/2] powerpc/mm: Enable page parallel initialisation Andrew Morton <akpm@linux-foundation.org> - 2016-03-09 22:50 +0100
      Re: [PATCH 2/2] powerpc/mm: Enable page parallel initialisation Michael Ellerman <mpe@ellerman.id.au> - 2016-03-10 01:30 +0100

csiph-web