Commit 1184dc2f authored by Mike Travis's avatar Mike Travis Committed by Ingo Molnar
Browse files

x86: modify Kconfig to allow up to 4096 cpus 



  * Increase the limit of NR_CPUS to 4096 and introduce a boolean
    called "MAXSMP" which when set (e.g. "allyesconfig"), will set
    NR_CPUS = 4096 and NODES_SHIFT = 9 (512).

  * Changed max setting for NODES_SHIFT from 15 to 9 to accurately
    reflect the real limit.

Signed-off-by: default avatarMike Travis <travis@sgi.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 7496b606

arch/x86/Kconfig

+32 −5
Original line number Diff line number Diff line
@@ -561,20 +561,35 @@ config SWIOTLB 


config IOMMU_HELPER

	def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB)

config MAXSMP

	bool "Configure Maximum number of SMP Processors and NUMA Nodes"

	depends on X86_64 && SMP

	default n

	help

	  Configure maximum number of CPUS and NUMA Nodes for this architecture.

	  If unsure, say N.



if MAXSMP

config NR_CPUS

	int "Maximum number of CPUs (2-255)"

	range 2 255

	int

	default "4096"

endif



if !MAXSMP

config NR_CPUS

	int "Maximum number of CPUs (2-4096)"

	range 2 4096

	depends on SMP

	default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000

	default "8"

	help

	  This allows you to specify the maximum number of CPUs which this

	  kernel will support.  The maximum supported value is 255 and the

	  kernel will support.  The maximum supported value is 4096 and the

	  minimum value which makes sense is 2.



	  This is purely to save memory - each supported CPU adds

	  approximately eight kilobytes to the kernel image.

endif



config SCHED_SMT

	bool "SMT (Hyperthreading) scheduler support"
@@ -965,13 +980,25 @@ config NUMA_EMU 
	  into virtual nodes when booted with "numa=fake=N", where N is the

	  number of nodes. This is only useful for debugging.



if MAXSMP



config NODES_SHIFT

	int

	default "9"

endif



if !MAXSMP

config NODES_SHIFT

	int "Max num nodes shift(1-9)"

	int "Maximum NUMA Nodes (as a power of 2)"

	range 1 9   if X86_64

	default "6" if X86_64

	default "4" if X86_NUMAQ

	default "3"

	depends on NEED_MULTIPLE_NODES

	help

	  Specify the maximum number of NUMA Nodes available on the target

	  system.  Increases memory reserved to accomodate various tables.

endif



config HAVE_ARCH_BOOTMEM_NODE

	def_bool y

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