mirror of https://gitee.com/openkylin/linux.git
495 lines
14 KiB
Plaintext
495 lines
14 KiB
Plaintext
#
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# For a description of the syntax of this configuration file,
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# see Documentation/kbuild/kconfig-language.txt.
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#
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config MMU
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bool
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default y
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config LOCKDEP_SUPPORT
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bool
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default y
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config STACKTRACE_SUPPORT
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bool
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default y
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config RWSEM_GENERIC_SPINLOCK
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bool
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config RWSEM_XCHGADD_ALGORITHM
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bool
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default y
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config GENERIC_HWEIGHT
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bool
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default y
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config GENERIC_CALIBRATE_DELAY
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bool
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default y
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config GENERIC_BUST_SPINLOCK
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bool
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mainmenu "Linux Kernel Configuration"
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config S390
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bool
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default y
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source "init/Kconfig"
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menu "Base setup"
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comment "Processor type and features"
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config 64BIT
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bool "64 bit kernel"
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help
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Select this option if you have a 64 bit IBM zSeries machine
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and want to use the 64 bit addressing mode.
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config SMP
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bool "Symmetric multi-processing support"
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---help---
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This enables support for systems with more than one CPU. If you have
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a system with only one CPU, like most personal computers, say N. If
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you have a system with more than one CPU, say Y.
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If you say N here, the kernel will run on single and multiprocessor
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machines, but will use only one CPU of a multiprocessor machine. If
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you say Y here, the kernel will run on many, but not all,
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singleprocessor machines. On a singleprocessor machine, the kernel
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will run faster if you say N here.
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See also the <file:Documentation/smp.txt> and the SMP-HOWTO
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available at <http://www.tldp.org/docs.html#howto>.
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Even if you don't know what to do here, say Y.
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config NR_CPUS
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int "Maximum number of CPUs (2-64)"
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range 2 64
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depends on SMP
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default "32"
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help
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This allows you to specify the maximum number of CPUs which this
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kernel will support. The maximum supported value is 64 and the
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minimum value which makes sense is 2.
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This is purely to save memory - each supported CPU adds
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approximately sixteen kilobytes to the kernel image.
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config HOTPLUG_CPU
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bool "Support for hot-pluggable CPUs"
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depends on SMP
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select HOTPLUG
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default n
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help
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Say Y here to be able to turn CPUs off and on. CPUs
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can be controlled through /sys/devices/system/cpu/cpu#.
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Say N if you want to disable CPU hotplug.
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config DEFAULT_MIGRATION_COST
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int
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default "1000000"
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config MATHEMU
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bool "IEEE FPU emulation"
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depends on MARCH_G5
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help
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This option is required for IEEE compliant floating point arithmetic
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on older S/390 machines. Say Y unless you know your machine doesn't
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need this.
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config COMPAT
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bool "Kernel support for 31 bit emulation"
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depends on 64BIT
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help
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Select this option if you want to enable your system kernel to
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handle system-calls from ELF binaries for 31 bit ESA. This option
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(and some other stuff like libraries and such) is needed for
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executing 31 bit applications. It is safe to say "Y".
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config SYSVIPC_COMPAT
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bool
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depends on COMPAT && SYSVIPC
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default y
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comment "Code generation options"
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choice
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prompt "Processor type"
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default MARCH_G5
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config MARCH_G5
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bool "S/390 model G5 and G6"
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depends on !64BIT
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help
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Select this to build a 31 bit kernel that works
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on all S/390 and zSeries machines.
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config MARCH_Z900
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bool "IBM eServer zSeries model z800 and z900"
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help
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Select this to optimize for zSeries machines. This
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will enable some optimizations that are not available
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on older 31 bit only CPUs.
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config MARCH_Z990
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bool "IBM eServer zSeries model z890 and z990"
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help
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Select this enable optimizations for model z890/z990.
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This will be slightly faster but does not work on
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older machines such as the z900.
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endchoice
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config PACK_STACK
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bool "Pack kernel stack"
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help
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This option enables the compiler option -mkernel-backchain if it
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is available. If the option is available the compiler supports
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the new stack layout which dramatically reduces the minimum stack
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frame size. With an old compiler a non-leaf function needs a
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minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
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-mkernel-backchain the minimum size drops to 16 byte on 31 bit
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and 24 byte on 64 bit.
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Say Y if you are unsure.
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config SMALL_STACK
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bool "Use 4kb/8kb for kernel stack instead of 8kb/16kb"
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depends on PACK_STACK
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help
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If you say Y here and the compiler supports the -mkernel-backchain
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option the kernel will use a smaller kernel stack size. For 31 bit
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the reduced size is 4kb instead of 8kb and for 64 bit it is 8kb
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instead of 16kb. This allows to run more thread on a system and
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reduces the pressure on the memory management for higher order
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page allocations.
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Say N if you are unsure.
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config CHECK_STACK
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bool "Detect kernel stack overflow"
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help
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This option enables the compiler option -mstack-guard and
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-mstack-size if they are available. If the compiler supports them
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it will emit additional code to each function prolog to trigger
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an illegal operation if the kernel stack is about to overflow.
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Say N if you are unsure.
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config STACK_GUARD
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int "Size of the guard area (128-1024)"
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range 128 1024
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depends on CHECK_STACK
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default "256"
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help
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This allows you to specify the size of the guard area at the lower
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end of the kernel stack. If the kernel stack points into the guard
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area on function entry an illegal operation is triggered. The size
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needs to be a power of 2. Please keep in mind that the size of an
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interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
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The minimum size for the stack guard should be 256 for 31 bit and
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512 for 64 bit.
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config WARN_STACK
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bool "Emit compiler warnings for function with broken stack usage"
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help
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This option enables the compiler options -mwarn-framesize and
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-mwarn-dynamicstack. If the compiler supports these options it
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will generate warnings for function which either use alloca or
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create a stack frame bigger then CONFIG_WARN_STACK_SIZE.
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Say N if you are unsure.
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config WARN_STACK_SIZE
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int "Maximum frame size considered safe (128-2048)"
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range 128 2048
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depends on WARN_STACK
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default "256"
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help
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This allows you to specify the maximum frame size a function may
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have without the compiler complaining about it.
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source "mm/Kconfig"
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comment "I/O subsystem configuration"
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config MACHCHK_WARNING
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bool "Process warning machine checks"
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help
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Select this option if you want the machine check handler on IBM S/390 or
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zSeries to process warning machine checks (e.g. on power failures).
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If unsure, say "Y".
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config QDIO
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tristate "QDIO support"
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---help---
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This driver provides the Queued Direct I/O base support for
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IBM mainframes.
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For details please refer to the documentation provided by IBM at
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<http://www10.software.ibm.com/developerworks/opensource/linux390>
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To compile this driver as a module, choose M here: the
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module will be called qdio.
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If unsure, say Y.
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config QDIO_PERF_STATS
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bool "Performance statistics in /proc"
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depends on QDIO
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help
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Say Y here to get performance statistics in /proc/qdio_perf
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If unsure, say N.
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config QDIO_DEBUG
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bool "Extended debugging information"
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depends on QDIO
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help
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Say Y here to get extended debugging output in
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/sys/kernel/debug/s390dbf/qdio...
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Warning: this option reduces the performance of the QDIO module.
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If unsure, say N.
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comment "Misc"
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config PREEMPT
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bool "Preemptible Kernel"
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help
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This option reduces the latency of the kernel when reacting to
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real-time or interactive events by allowing a low priority process to
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be preempted even if it is in kernel mode executing a system call.
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This allows applications to run more reliably even when the system is
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under load.
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Say N if you are unsure.
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config IPL
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bool "Builtin IPL record support"
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help
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If you want to use the produced kernel to IPL directly from a
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device, you have to merge a bootsector specific to the device
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into the first bytes of the kernel. You will have to select the
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IPL device.
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choice
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prompt "IPL method generated into head.S"
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depends on IPL
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default IPL_TAPE
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help
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Select "tape" if you want to IPL the image from a Tape.
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Select "vm_reader" if you are running under VM/ESA and want
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to IPL the image from the emulated card reader.
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config IPL_TAPE
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bool "tape"
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config IPL_VM
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bool "vm_reader"
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endchoice
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source "fs/Kconfig.binfmt"
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config PROCESS_DEBUG
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bool "Show crashed user process info"
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help
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Say Y to print all process fault locations to the console. This is
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a debugging option; you probably do not want to set it unless you
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are an S390 port maintainer.
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config PFAULT
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bool "Pseudo page fault support"
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help
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Select this option, if you want to use PFAULT pseudo page fault
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handling under VM. If running native or in LPAR, this option
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has no effect. If your VM does not support PFAULT, PAGEEX
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pseudo page fault handling will be used.
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Note that VM 4.2 supports PFAULT but has a bug in its
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implementation that causes some problems.
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Everybody who wants to run Linux under VM != VM4.2 should select
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this option.
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config SHARED_KERNEL
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bool "VM shared kernel support"
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help
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Select this option, if you want to share the text segment of the
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Linux kernel between different VM guests. This reduces memory
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usage with lots of guests but greatly increases kernel size.
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You should only select this option if you know what you are
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doing and want to exploit this feature.
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config CMM
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tristate "Cooperative memory management"
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help
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Select this option, if you want to enable the kernel interface
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to reduce the memory size of the system. This is accomplished
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by allocating pages of memory and put them "on hold". This only
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makes sense for a system running under VM where the unused pages
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will be reused by VM for other guest systems. The interface
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allows an external monitor to balance memory of many systems.
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Everybody who wants to run Linux under VM should select this
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option.
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config CMM_PROC
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bool "/proc interface to cooperative memory management"
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depends on CMM
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help
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Select this option to enable the /proc interface to the
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cooperative memory management.
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config CMM_IUCV
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bool "IUCV special message interface to cooperative memory management"
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depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
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help
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Select this option to enable the special message interface to
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the cooperative memory management.
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config VIRT_TIMER
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bool "Virtual CPU timer support"
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help
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This provides a kernel interface for virtual CPU timers.
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Default is disabled.
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config VIRT_CPU_ACCOUNTING
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bool "Base user process accounting on virtual cpu timer"
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depends on VIRT_TIMER
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help
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Select this option to use CPU timer deltas to do user
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process accounting.
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config APPLDATA_BASE
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bool "Linux - VM Monitor Stream, base infrastructure"
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depends on PROC_FS && VIRT_TIMER=y
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help
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This provides a kernel interface for creating and updating z/VM APPLDATA
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monitor records. The monitor records are updated at certain time
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intervals, once the timer is started.
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Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
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i.e. enables or disables monitoring on the Linux side.
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A custom interval value (in seconds) can be written to
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/proc/appldata/interval.
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Defaults are 60 seconds interval and timer off.
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The /proc entries can also be read from, showing the current settings.
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config APPLDATA_MEM
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tristate "Monitor memory management statistics"
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depends on APPLDATA_BASE
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help
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This provides memory management related data to the Linux - VM Monitor
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Stream, like paging/swapping rate, memory utilisation, etc.
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Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
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APPLDATA monitor record, i.e. enables or disables monitoring this record
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on the z/VM side.
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Default is disabled.
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The /proc entry can also be read from, showing the current settings.
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This can also be compiled as a module, which will be called
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appldata_mem.o.
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config APPLDATA_OS
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tristate "Monitor OS statistics"
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depends on APPLDATA_BASE
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help
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This provides OS related data to the Linux - VM Monitor Stream, like
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CPU utilisation, etc.
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Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
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APPLDATA monitor record, i.e. enables or disables monitoring this record
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on the z/VM side.
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Default is disabled.
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This can also be compiled as a module, which will be called
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appldata_os.o.
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config APPLDATA_NET_SUM
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tristate "Monitor overall network statistics"
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depends on APPLDATA_BASE
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help
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This provides network related data to the Linux - VM Monitor Stream,
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currently there is only a total sum of network I/O statistics, no
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per-interface data.
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Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
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APPLDATA monitor record, i.e. enables or disables monitoring this record
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on the z/VM side.
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Default is disabled.
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This can also be compiled as a module, which will be called
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appldata_net_sum.o.
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config NO_IDLE_HZ
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bool "No HZ timer ticks in idle"
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help
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Switches the regular HZ timer off when the system is going idle.
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This helps z/VM to detect that the Linux system is idle. VM can
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then "swap-out" this guest which reduces memory usage. It also
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reduces the overhead of idle systems.
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The HZ timer can be switched on/off via /proc/sys/kernel/hz_timer.
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hz_timer=0 means HZ timer is disabled. hz_timer=1 means HZ
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timer is active.
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config NO_IDLE_HZ_INIT
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bool "HZ timer in idle off by default"
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depends on NO_IDLE_HZ
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help
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The HZ timer is switched off in idle by default. That means the
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HZ timer is already disabled at boot time.
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config S390_HYPFS_FS
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bool "s390 hypervisor file system support"
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select SYS_HYPERVISOR
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default y
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help
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This is a virtual file system intended to provide accounting
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information in an s390 hypervisor environment.
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config KEXEC
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bool "kexec system call (EXPERIMENTAL)"
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depends on EXPERIMENTAL
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help
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kexec is a system call that implements the ability to shutdown your
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current kernel, and to start another kernel. It is like a reboot
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but is independent of hardware/microcode support.
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endmenu
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source "net/Kconfig"
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config PCMCIA
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bool
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default n
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source "drivers/base/Kconfig"
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source "drivers/connector/Kconfig"
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source "drivers/scsi/Kconfig"
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source "drivers/s390/Kconfig"
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source "drivers/net/Kconfig"
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source "fs/Kconfig"
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source "arch/s390/oprofile/Kconfig"
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source "arch/s390/Kconfig.debug"
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source "security/Kconfig"
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source "crypto/Kconfig"
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source "lib/Kconfig"
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