[PATCH 02/12] x86 Kconfig: memory options
From: Dave Hansen
Date: Mon Dec 30 2013 - 13:40:58 EST
From: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
This consolidates a bunch of VM, memory and NUMA options down to
be under a single Kconfig menu. Most of this stuff is pretty
obscure, like HIGHPTE or ZONE_DMA support. It doesn't really
deserve to be in the top-level menu.
For what it's worth "Processor type and features" seems to have
become mostly a dumping ground for architecture-specific
features. Maybe we should just change the name of the menu too?
Signed-off-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
---
linux.git-davehans/arch/x86/Kconfig | 450 ++++++++++++++++++------------------
1 file changed, 227 insertions(+), 223 deletions(-)
diff -puN arch/x86/Kconfig~x86-memory-options arch/x86/Kconfig
--- linux.git/arch/x86/Kconfig~x86-memory-options 2013-12-30 10:37:43.974177677 -0800
+++ linux.git-davehans/arch/x86/Kconfig 2013-12-30 10:37:43.978177857 -0800
@@ -264,16 +264,6 @@ source "kernel/Kconfig.freezer"
menu "Processor type and features"
-config ZONE_DMA
- bool "DMA memory allocation support" if EXPERT
- default y
- help
- DMA memory allocation support allows devices with less than 32-bit
- addressing to allocate within the first 16MB of address space.
- Disable if no such devices will be used.
-
- If unsure, say Y.
-
config SMP
bool "Symmetric multi-processing support"
---help---
@@ -472,6 +462,233 @@ config X86_NUMAQ
endif # X86_EXTENDED_PLATFORM
+menu "Memory and NUMA Options"
+
+config ZONE_DMA
+ bool "DMA memory allocation support" if EXPERT
+ default y
+ help
+ DMA memory allocation support allows devices with less than 32-bit
+ addressing to allocate within the first 16MB of address space.
+ Disable if no such devices will be used.
+
+ If unsure, say Y.
+
+config DIRECT_GBPAGES
+ bool "Enable 1GB pages for kernel pagetables" if EXPERT
+ default y
+ depends on X86_64
+ ---help---
+ Allow the kernel linear mapping to use 1GB pages on CPUs that
+ support it. This can improve the kernel's performance a tiny bit by
+ reducing TLB pressure. If in doubt, say "Y".
+
+# Common NUMA Features
+config NUMA
+ bool "Numa Memory Allocation and Scheduler Support"
+ depends on SMP
+ depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI))
+ default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
+ ---help---
+ Enable NUMA (Non Uniform Memory Access) support.
+
+ The kernel will try to allocate memory used by a CPU on the
+ local memory controller of the CPU and add some more
+ NUMA awareness to the kernel.
+
+ For 64-bit this is recommended if the system is Intel Core i7
+ (or later), AMD Opteron, or EM64T NUMA.
+
+ For 32-bit this is only needed on (rare) 32-bit-only platforms
+ that support NUMA topologies, such as NUMAQ / Summit, or if you
+ boot a 32-bit kernel on a 64-bit NUMA platform.
+
+ Otherwise, you should say N.
+
+comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
+ depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
+
+config AMD_NUMA
+ def_bool y
+ prompt "Old style AMD Opteron NUMA detection"
+ depends on X86_64 && NUMA && PCI
+ ---help---
+ Enable AMD NUMA node topology detection. You should say Y here if
+ you have a multi processor AMD system. This uses an old method to
+ read the NUMA configuration directly from the builtin Northbridge
+ of Opteron. It is recommended to use X86_64_ACPI_NUMA instead,
+ which also takes priority if both are compiled in.
+
+config X86_64_ACPI_NUMA
+ def_bool y
+ prompt "ACPI NUMA detection"
+ depends on X86_64 && NUMA && ACPI && PCI
+ select ACPI_NUMA
+ ---help---
+ Enable ACPI SRAT based node topology detection.
+
+# Some NUMA nodes have memory ranges that span
+# other nodes. Even though a pfn is valid and
+# between a node's start and end pfns, it may not
+# reside on that node. See memmap_init_zone()
+# for details.
+config NODES_SPAN_OTHER_NODES
+ def_bool y
+ depends on X86_64_ACPI_NUMA
+
+config NUMA_EMU
+ bool "NUMA emulation"
+ depends on NUMA
+ ---help---
+ Enable NUMA emulation. A flat machine will be split
+ into virtual nodes when booted with "numa=fake=N", where N is the
+ number of nodes. This is only useful for debugging.
+
+config NODES_SHIFT
+ int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
+ range 1 10
+ default "10" if MAXSMP
+ 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 accommodate various tables.
+
+config ARCH_HAVE_MEMORY_PRESENT
+ def_bool y
+ depends on X86_32 && DISCONTIGMEM
+
+config NEED_NODE_MEMMAP_SIZE
+ def_bool y
+ depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
+
+config ARCH_FLATMEM_ENABLE
+ def_bool y
+ depends on X86_32 && !NUMA
+
+config ARCH_DISCONTIGMEM_ENABLE
+ def_bool y
+ depends on NUMA && X86_32
+
+config ARCH_DISCONTIGMEM_DEFAULT
+ def_bool y
+ depends on NUMA && X86_32
+
+config ARCH_SPARSEMEM_ENABLE
+ def_bool y
+ depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD
+ select SPARSEMEM_STATIC if X86_32
+ select SPARSEMEM_VMEMMAP_ENABLE if X86_64
+
+config ARCH_SPARSEMEM_DEFAULT
+ def_bool y
+ depends on X86_64
+
+config ARCH_SELECT_MEMORY_MODEL
+ def_bool y
+ depends on ARCH_SPARSEMEM_ENABLE
+
+config ARCH_MEMORY_PROBE
+ bool "Enable sysfs memory/probe interface"
+ depends on X86_64 && MEMORY_HOTPLUG
+ help
+ This option enables a sysfs memory/probe interface for testing.
+ See Documentation/memory-hotplug.txt for more information.
+ If you are unsure how to answer this question, answer N.
+
+config ARCH_PROC_KCORE_TEXT
+ def_bool y
+ depends on X86_64 && PROC_KCORE
+
+config ILLEGAL_POINTER_VALUE
+ hex
+ default 0 if X86_32
+ default 0xdead000000000000 if X86_64
+
+source "mm/Kconfig"
+
+config HIGHPTE
+ bool "Allocate 3rd-level pagetables from highmem"
+ depends on HIGHMEM
+ ---help---
+ The VM uses one page table entry for each page of physical memory.
+ For systems with a lot of RAM, this can be wasteful of precious
+ low memory. Setting this option will put user-space page table
+ entries in high memory.
+
+config X86_CHECK_BIOS_CORRUPTION
+ bool "Check for low memory corruption"
+ ---help---
+ Periodically check for memory corruption in low memory, which
+ is suspected to be caused by BIOS. Even when enabled in the
+ configuration, it is disabled at runtime. Enable it by
+ setting "memory_corruption_check=1" on the kernel command
+ line. By default it scans the low 64k of memory every 60
+ seconds; see the memory_corruption_check_size and
+ memory_corruption_check_period parameters in
+ Documentation/kernel-parameters.txt to adjust this.
+
+ When enabled with the default parameters, this option has
+ almost no overhead, as it reserves a relatively small amount
+ of memory and scans it infrequently. It both detects corruption
+ and prevents it from affecting the running system.
+
+ It is, however, intended as a diagnostic tool; if repeatable
+ BIOS-originated corruption always affects the same memory,
+ you can use memmap= to prevent the kernel from using that
+ memory.
+
+config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
+ bool "Set the default setting of memory_corruption_check"
+ depends on X86_CHECK_BIOS_CORRUPTION
+ default y
+ ---help---
+ Set whether the default state of memory_corruption_check is
+ on or off.
+
+config X86_RESERVE_LOW
+ int "Amount of low memory, in kilobytes, to reserve for the BIOS"
+ default 64
+ range 4 640
+ ---help---
+ Specify the amount of low memory to reserve for the BIOS.
+
+ The first page contains BIOS data structures that the kernel
+ must not use, so that page must always be reserved.
+
+ By default we reserve the first 64K of physical RAM, as a
+ number of BIOSes are known to corrupt that memory range
+ during events such as suspend/resume or monitor cable
+ insertion, so it must not be used by the kernel.
+
+ You can set this to 4 if you are absolutely sure that you
+ trust the BIOS to get all its memory reservations and usages
+ right. If you know your BIOS have problems beyond the
+ default 64K area, you can set this to 640 to avoid using the
+ entire low memory range.
+
+ If you have doubts about the BIOS (e.g. suspend/resume does
+ not work or there's kernel crashes after certain hardware
+ hotplug events) then you might want to enable
+ X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check
+ typical corruption patterns.
+
+ Leave this to the default value of 64 if you are unsure.
+
+config X86_SUPPORTS_MEMORY_FAILURE
+ def_bool y
+ # MCE code calls memory_failure():
+ depends on X86_MCE
+ # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
+ depends on !X86_NUMAQ
+ # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
+ depends on X86_64 || !SPARSEMEM
+ select ARCH_SUPPORTS_MEMORY_FAILURE
+
+endmenu # Memory and NUMA Options
+
if X86_WANT_INTEL_MID
config X86_INTEL_MID
@@ -511,16 +728,6 @@ config X86_INTEL_LPSS
things like clock tree (common clock framework) and pincontrol
which are needed by the LPSS peripheral drivers.
-config X86_SUPPORTS_MEMORY_FAILURE
- def_bool y
- # MCE code calls memory_failure():
- depends on X86_MCE
- # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
- depends on !X86_NUMAQ
- # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
- depends on X86_64 || !SPARSEMEM
- select ARCH_SUPPORTS_MEMORY_FAILURE
-
config X86_VISWS
bool "SGI 320/540 (Visual Workstation)"
depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT
@@ -1232,209 +1439,6 @@ config ARCH_DMA_ADDR_T_64BIT
def_bool y
depends on X86_64 || HIGHMEM64G
-config DIRECT_GBPAGES
- bool "Enable 1GB pages for kernel pagetables" if EXPERT
- default y
- depends on X86_64
- ---help---
- Allow the kernel linear mapping to use 1GB pages on CPUs that
- support it. This can improve the kernel's performance a tiny bit by
- reducing TLB pressure. If in doubt, say "Y".
-
-# Common NUMA Features
-config NUMA
- bool "Numa Memory Allocation and Scheduler Support"
- depends on SMP
- depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI))
- default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
- ---help---
- Enable NUMA (Non Uniform Memory Access) support.
-
- The kernel will try to allocate memory used by a CPU on the
- local memory controller of the CPU and add some more
- NUMA awareness to the kernel.
-
- For 64-bit this is recommended if the system is Intel Core i7
- (or later), AMD Opteron, or EM64T NUMA.
-
- For 32-bit this is only needed on (rare) 32-bit-only platforms
- that support NUMA topologies, such as NUMAQ / Summit, or if you
- boot a 32-bit kernel on a 64-bit NUMA platform.
-
- Otherwise, you should say N.
-
-comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
- depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
-
-config AMD_NUMA
- def_bool y
- prompt "Old style AMD Opteron NUMA detection"
- depends on X86_64 && NUMA && PCI
- ---help---
- Enable AMD NUMA node topology detection. You should say Y here if
- you have a multi processor AMD system. This uses an old method to
- read the NUMA configuration directly from the builtin Northbridge
- of Opteron. It is recommended to use X86_64_ACPI_NUMA instead,
- which also takes priority if both are compiled in.
-
-config X86_64_ACPI_NUMA
- def_bool y
- prompt "ACPI NUMA detection"
- depends on X86_64 && NUMA && ACPI && PCI
- select ACPI_NUMA
- ---help---
- Enable ACPI SRAT based node topology detection.
-
-# Some NUMA nodes have memory ranges that span
-# other nodes. Even though a pfn is valid and
-# between a node's start and end pfns, it may not
-# reside on that node. See memmap_init_zone()
-# for details.
-config NODES_SPAN_OTHER_NODES
- def_bool y
- depends on X86_64_ACPI_NUMA
-
-config NUMA_EMU
- bool "NUMA emulation"
- depends on NUMA
- ---help---
- Enable NUMA emulation. A flat machine will be split
- into virtual nodes when booted with "numa=fake=N", where N is the
- number of nodes. This is only useful for debugging.
-
-config NODES_SHIFT
- int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
- range 1 10
- default "10" if MAXSMP
- 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 accommodate various tables.
-
-config ARCH_HAVE_MEMORY_PRESENT
- def_bool y
- depends on X86_32 && DISCONTIGMEM
-
-config NEED_NODE_MEMMAP_SIZE
- def_bool y
- depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
-
-config ARCH_FLATMEM_ENABLE
- def_bool y
- depends on X86_32 && !NUMA
-
-config ARCH_DISCONTIGMEM_ENABLE
- def_bool y
- depends on NUMA && X86_32
-
-config ARCH_DISCONTIGMEM_DEFAULT
- def_bool y
- depends on NUMA && X86_32
-
-config ARCH_SPARSEMEM_ENABLE
- def_bool y
- depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD
- select SPARSEMEM_STATIC if X86_32
- select SPARSEMEM_VMEMMAP_ENABLE if X86_64
-
-config ARCH_SPARSEMEM_DEFAULT
- def_bool y
- depends on X86_64
-
-config ARCH_SELECT_MEMORY_MODEL
- def_bool y
- depends on ARCH_SPARSEMEM_ENABLE
-
-config ARCH_MEMORY_PROBE
- bool "Enable sysfs memory/probe interface"
- depends on X86_64 && MEMORY_HOTPLUG
- help
- This option enables a sysfs memory/probe interface for testing.
- See Documentation/memory-hotplug.txt for more information.
- If you are unsure how to answer this question, answer N.
-
-config ARCH_PROC_KCORE_TEXT
- def_bool y
- depends on X86_64 && PROC_KCORE
-
-config ILLEGAL_POINTER_VALUE
- hex
- default 0 if X86_32
- default 0xdead000000000000 if X86_64
-
-source "mm/Kconfig"
-
-config HIGHPTE
- bool "Allocate 3rd-level pagetables from highmem"
- depends on HIGHMEM
- ---help---
- The VM uses one page table entry for each page of physical memory.
- For systems with a lot of RAM, this can be wasteful of precious
- low memory. Setting this option will put user-space page table
- entries in high memory.
-
-config X86_CHECK_BIOS_CORRUPTION
- bool "Check for low memory corruption"
- ---help---
- Periodically check for memory corruption in low memory, which
- is suspected to be caused by BIOS. Even when enabled in the
- configuration, it is disabled at runtime. Enable it by
- setting "memory_corruption_check=1" on the kernel command
- line. By default it scans the low 64k of memory every 60
- seconds; see the memory_corruption_check_size and
- memory_corruption_check_period parameters in
- Documentation/kernel-parameters.txt to adjust this.
-
- When enabled with the default parameters, this option has
- almost no overhead, as it reserves a relatively small amount
- of memory and scans it infrequently. It both detects corruption
- and prevents it from affecting the running system.
-
- It is, however, intended as a diagnostic tool; if repeatable
- BIOS-originated corruption always affects the same memory,
- you can use memmap= to prevent the kernel from using that
- memory.
-
-config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
- bool "Set the default setting of memory_corruption_check"
- depends on X86_CHECK_BIOS_CORRUPTION
- default y
- ---help---
- Set whether the default state of memory_corruption_check is
- on or off.
-
-config X86_RESERVE_LOW
- int "Amount of low memory, in kilobytes, to reserve for the BIOS"
- default 64
- range 4 640
- ---help---
- Specify the amount of low memory to reserve for the BIOS.
-
- The first page contains BIOS data structures that the kernel
- must not use, so that page must always be reserved.
-
- By default we reserve the first 64K of physical RAM, as a
- number of BIOSes are known to corrupt that memory range
- during events such as suspend/resume or monitor cable
- insertion, so it must not be used by the kernel.
-
- You can set this to 4 if you are absolutely sure that you
- trust the BIOS to get all its memory reservations and usages
- right. If you know your BIOS have problems beyond the
- default 64K area, you can set this to 640 to avoid using the
- entire low memory range.
-
- If you have doubts about the BIOS (e.g. suspend/resume does
- not work or there's kernel crashes after certain hardware
- hotplug events) then you might want to enable
- X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check
- typical corruption patterns.
-
- Leave this to the default value of 64 if you are unsure.
-
config MATH_EMULATION
bool
prompt "Math emulation" if X86_32
_
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