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Commit c80d79d7 authored by Yasunori Goto's avatar Yasunori Goto Committed by Linus Torvalds
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[PATCH] Configurable NODES_SHIFT 

Current implementations define NODES_SHIFT in include/asm-xxx/numnodes.h for
each arch.  Its definition is sometimes configurable.  Indeed, ia64 defines 5
NODES_SHIFT values in the current git tree.  But it looks a bit messy.

SGI-SN2(ia64) system requires 1024 nodes, and the number of nodes already has
been changeable by config.  Suitable node's number may be changed in the
future even if it is other architecture.  So, I wrote configurable node's
number.

This patch set defines just default value for each arch which needs multi
nodes except ia64.  But, it is easy to change to configurable if necessary.

On ia64 the number of nodes can be already configured in generic ia64 and SN2
config.  But, NODES_SHIFT is defined for DIG64 and HP'S machine too.  So, I
changed it so that all platforms can be configured via CONFIG_NODES_SHIFT.  It
would be simpler.

See also: http://marc.theaimsgroup.com/?l=linux-kernel&m=114358010523896&w=2



Signed-off-by: default avatarYasunori Goto <y-goto@jp.fujitsu.com>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Andi Kleen <ak@muc.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Jack Steiner <steiner@sgi.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 653edba1

arch/alpha/Kconfig

+5 −0
Original line number Diff line number Diff line
@@ -549,6 +549,11 @@ config NUMA 
	  Access).  This option is for configuring high-end multiprocessor

	  server machines.  If in doubt, say N.



config NODES_SHIFT

	int

	default "7"

	depends on NEED_MULTIPLE_NODES



# LARGE_VMALLOC is racy, if you *really* need it then fix it first

config ALPHA_LARGE_VMALLOC

	bool

arch/arm/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -512,6 +512,12 @@ config ARCH_DISCONTIGMEM_ENABLE 
	  or have huge holes in the physical address space for other reasons.

	  See <file:Documentation/vm/numa> for more.



config NODES_SHIFT

	int

	default "4" if ARCH_LH7A40X

	default "2"

	depends on NEED_MULTIPLE_NODES



source "mm/Kconfig"



config LEDS

arch/i386/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -522,6 +522,12 @@ config NUMA 
comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"

	depends on X86_SUMMIT && (!HIGHMEM64G || !ACPI)



config NODES_SHIFT

	int

	default "4" if X86_NUMAQ

	default "3"

	depends on NEED_MULTIPLE_NODES



config HAVE_ARCH_BOOTMEM_NODE

	bool

	depends on NUMA

arch/ia64/Kconfig

+10 −9
Original line number Diff line number Diff line
@@ -260,15 +260,6 @@ config NR_CPUS 
	  than 64 will cause the use of a CPU mask array, causing a small

	  performance hit.



config IA64_NR_NODES

	int "Maximum number of NODEs (256-1024)" if (IA64_SGI_SN2 || IA64_GENERIC)

	range 256 1024

	depends on IA64_SGI_SN2 || IA64_GENERIC

	default "256"

	help

	  This option specifies the maximum number of nodes in your SSI system.

	  If in doubt, use the default.



config HOTPLUG_CPU

	bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"

	depends on SMP && EXPERIMENTAL
@@ -352,6 +343,16 @@ config NUMA 
	  Access).  This option is for configuring high-end multiprocessor

	  server systems.  If in doubt, say N.



config NODES_SHIFT

	int "Max num nodes shift(3-10)"

	range 3 10

	default "8"

	depends on NEED_MULTIPLE_NODES

	help

	  This option specifies the maximum number of nodes in your SSI system.

	  MAX_NUMNODES will be 2^(This value).

	  If in doubt, use the default.



# VIRTUAL_MEM_MAP and FLAT_NODE_MEM_MAP are functionally equivalent.

# VIRTUAL_MEM_MAP has been retained for historical reasons.

config VIRTUAL_MEM_MAP

arch/m32r/Kconfig

+5 −0
Original line number Diff line number Diff line
@@ -285,6 +285,11 @@ config NUMA 
	depends on SMP && BROKEN

	default n



config NODES_SHIFT

	int

	default "1"

	depends on NEED_MULTIPLE_NODES



# turning this on wastes a bunch of space.

# Summit needs it only when NUMA is on

config BOOT_IOREMAP