diff options
Diffstat (limited to 'arch/arm64/Kconfig')
| -rw-r--r-- | arch/arm64/Kconfig | 52 |
1 files changed, 49 insertions, 3 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 78f20e6327120e..71e7c688724ca3 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1402,10 +1402,56 @@ config SCHED_SMT MultiThreading at a cost of slightly increased overhead in some places. If unsure say N here. + +config MAXSMP + bool "Compile kernel with support for the maximum number of SMP Processors" + depends on SMP && DEBUG_KERNEL + select CPUMASK_OFFSTACK + help + Enable maximum number of CPUS and NUMA Nodes for this architecture. + If unsure, say N. + +# +# The maximum number of CPUs supported: +# +# The main config value is NR_CPUS, which defaults to NR_CPUS_DEFAULT, +# and which can be configured interactively in the +# [NR_CPUS_RANGE_BEGIN ... NR_CPUS_RANGE_END] range. +# +# ( If MAXSMP is enabled we just use the highest possible value and disable +# interactive configuration. ) +# + +config NR_CPUS_RANGE_BEGIN + int + default NR_CPUS_RANGE_END if MAXSMP + default 1 if !SMP + default 2 + +config NR_CPUS_RANGE_END + int + default 8192 if SMP && CPUMASK_OFFSTACK + default 512 if SMP && !CPUMASK_OFFSTACK + default 1 if !SMP + +config NR_CPUS_DEFAULT + int + default 512 if MAXSMP + default 64 if SMP + default 1 if !SMP + config NR_CPUS - int "Maximum number of CPUs (2-4096)" - range 2 4096 - default "256" + int "Set maximum number of CPUs" if SMP && !MAXSMP + range NR_CPUS_RANGE_BEGIN NR_CPUS_RANGE_END + default NR_CPUS_DEFAULT + help + This allows you to specify the maximum number of CPUs which this + kernel will support. If CPUMASK_OFFSTACK is enabled, the maximum + supported value is 8192, otherwise the maximum value is 512. The + minimum value which makes sense is 2. + + This is purely to save memory: each supported CPU adds about 8KB + to the kernel image. config HOTPLUG_CPU bool "Support for hot-pluggable CPUs" |