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SubjectRe: [PATCH 2/6] percpu: Change Kconfig ARCH_SETS_UP_PER_CPU_AREA to HAVE_SETUP_PER_CPU_AREA
Sam Ravnborg wrote:
> Hi Mike.
>
>> --- a/arch/x86/Kconfig
>> +++ b/arch/x86/Kconfig
>> @@ -20,6 +20,7 @@ config X86
>> def_bool y
>> select HAVE_OPROFILE
>> select HAVE_KPROBES
>> + select HAVE_SETUP_PER_CPU_AREA if ARCH = "x86_64"
>
> It is simpler to just say:
>> + select HAVE_SETUP_PER_CPU_AREA if X86_64
>
> And this is the way we do it in the rest of the
> x86 Kconfig files.
>
> Sam


I'm trying to trigger an increase in NR_CPUS if SMP_MAX
is set. But it doesn't seem to "take". Of the changes
below only NODES_SHIFT is changed. Is there something else
I need to change?

Thanks,
Mike


--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -487,19 +487,29 @@ config ARCH_SUPPORTS_KVM


config NR_CPUS
- int "Maximum number of CPUs (2-255)"
- range 2 255
+ int "Maximum number of CPUs (2-4096)"
+ range 2 4096
depends on SMP
+ default "1024" if X86_SMP_MAX
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.

+config THREAD_ORDER
+ int "Kernel stack size (in page order)"
+ range 1 3
+ depends on X86_64_SMP
+ default "3" if X86_SMP_MAX
+ default "1"
+ help
+ Increases kernel stack size.
+
config SCHED_SMT
bool "SMT (Hyperthreading) scheduler support"
depends on (X86_64 && SMP) || (X86_32 && X86_HT)
@@ -882,6 +892,7 @@ config NUMA_EMU

config NODES_SHIFT
int
+ default "9" if X86_SMP_MAX
default "6" if X86_64
default "4" if X86_NUMAQ
default "3"
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -73,6 +73,16 @@ config X86_FIND_SMP_CONFIG
depends on X86_LOCAL_APIC || X86_VOYAGER
depends on X86_32

+config X86_SMP_MAX
+ bool "Enable Maximum SMP configuration"
+ def_bool n
+ depends on X86_64_SMP
+ help
+ Say Y here to enable a "large" SMP configuration for testing
+ purposes. It does this by increasing the number of possible
+ cpus to the NR_CPUS count. It also triggers an increase in
+ NR_CPUS, NODES_SHIFT and THREAD_ORDER.
+


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