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authorFlorian Fainelli <florian@openwrt.org>2013-10-24 00:28:33 +0000
committerFlorian Fainelli <florian@openwrt.org>2013-10-24 00:28:33 +0000
commit4341ea40379ed24c103e37b75661c62bfc3270f6 (patch)
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buildroot: split Kernel config options to Config-kernel.in
The number of Linux kernel related config options has become quite big over the past few months, they deserve their own Config-kernel.in file. Signed-off-by: Florian Fainelli <florian@openwrt.org> SVN-Revision: 38524
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+config KERNEL_DEBUG_FS
+ bool "Compile the kernel with Debug FileSystem enabled"
+ default y
+ help
+ debugfs is a virtual file system that kernel developers use to put
+ debugging files into. Enable this option to be able to read and
+ write to these files.
+
+config KERNEL_PERF_EVENTS
+ bool
+ default n
+
+config KERNEL_PROFILING
+ bool "Compile the kernel with profiling enabled"
+ default n
+ select KERNEL_PERF_EVENTS
+ help
+ Enable the extended profiling support mechanisms used by profilers such
+ as OProfile.
+
+config KERNEL_KALLSYMS
+ bool "Compile the kernel with symbol table information"
+ default y
+ help
+ This will give you more information in stack traces from kernel oopses
+
+config KERNEL_FTRACE
+ bool "Compile the kernel with tracing support"
+ default n
+
+config KERNEL_FTRACE_SYSCALLS
+ bool "Trace system calls"
+ depends on KERNEL_FTRACE
+ default n
+
+config KERNEL_ENABLE_DEFAULT_TRACERS
+ bool "Trace process context switches and events"
+ depends on KERNEL_FTRACE
+ default n
+
+config KERNEL_DEBUG_KERNEL
+ bool
+ default n
+
+config KERNEL_DEBUG_INFO
+ bool "Compile the kernel with debug information"
+ default y
+ select KERNEL_DEBUG_KERNEL
+ help
+ This will compile your kernel and modules with debug information.
+
+config KERNEL_DEBUG_LL_UART_NONE
+ bool
+ default n
+ depends on arm
+
+config KERNEL_DEBUG_LL
+ bool
+ default n
+ depends on arm
+ select KERNEL_DEBUG_LL_UART_NONE
+ help
+ ARM low level debugging
+
+config KERNEL_EARLY_PRINTK
+ bool "Compile the kernel with early printk"
+ default n
+ depends on arm
+ select KERNEL_DEBUG_KERNEL
+ select KERNEL_DEBUG_LL if arm
+ help
+ Compile the kernel with early printk support.
+ This is only useful for debugging purposes to send messages
+ over the serial console in early boot.
+ Enable this to debug early boot problems.
+
+config KERNEL_AIO
+ bool "Compile the kernel with asynchronous IO support"
+ default n
+
+config KERNEL_DIRECT_IO
+ bool "Compile the kernel with direct IO support"
+ default n
+
+config KERNEL_MAGIC_SYSRQ
+ bool "Compile the kernel with SysRq support"
+ default y
+
+config KERNEL_COREDUMP
+ bool
+
+config KERNEL_ELF_CORE
+ bool "Enable process core dump support"
+ select KERNEL_COREDUMP
+ default y
+
+config KERNEL_PROVE_LOCKING
+ bool "Enable kernel lock checking"
+ select KERNEL_DEBUG_KERNEL
+ default n
+
+config KERNEL_PRINTK_TIME
+ bool "Enable printk timestamps"
+ default y
+
+config KERNEL_RELAY
+ bool
+
+config KERNEL_KEXEC
+ bool "Enable kexec support"
+
+config USE_RFKILL
+ bool "Enable rfkill support"
+ default RFKILL_SUPPORT
+
+#
+# CGROUP support symbols
+#
+
+config KERNEL_CGROUPS
+ bool "Enable kernel cgroups"
+ default n
+
+if KERNEL_CGROUPS
+
+ config KERNEL_CGROUP_DEBUG
+ bool "Example debug cgroup subsystem"
+ default n
+ help
+ This option enables a simple cgroup subsystem that
+ exports useful debugging information about the cgroups
+ framework.
+
+ config KERNEL_FREEZER
+ bool
+ default y if KERNEL_CGROUP_FREEZER
+
+ config KERNEL_CGROUP_FREEZER
+ bool "Freezer cgroup subsystem"
+ default n
+ help
+ Provides a way to freeze and unfreeze all tasks in a
+ cgroup.
+
+ config KERNEL_CGROUP_DEVICE
+ bool "Device controller for cgroups"
+ default y
+ help
+ Provides a cgroup implementing whitelists for devices which
+ a process in the cgroup can mknod or open.
+
+ config KERNEL_CPUSETS
+ bool "Cpuset support"
+ default n
+ help
+ This option will let you create and manage CPUSETs which
+ allow dynamically partitioning a system into sets of CPUs and
+ Memory Nodes and assigning tasks to run only within those sets.
+ This is primarily useful on large SMP or NUMA systems.
+
+ config KERNEL_PROC_PID_CPUSET
+ bool "Include legacy /proc/<pid>/cpuset file"
+ default n
+ depends on KERNEL_CPUSETS
+
+ config KERNEL_CGROUP_CPUACCT
+ bool "Simple CPU accounting cgroup subsystem"
+ default n
+ help
+ Provides a simple Resource Controller for monitoring the
+ total CPU consumed by the tasks in a cgroup.
+
+ config KERNEL_RESOURCE_COUNTERS
+ bool "Resource counters"
+ default n
+ help
+ This option enables controller independent resource accounting
+ infrastructure that works with cgroups.
+
+ config KERNEL_MM_OWNER
+ bool
+ default y if KERNEL_MEMCG
+
+ config KERNEL_MEMCG
+ bool "Memory Resource Controller for Control Groups"
+ default n
+ depends on KERNEL_RESOURCE_COUNTERS
+ help
+ Provides a memory resource controller that manages both anonymous
+ memory and page cache. (See Documentation/cgroups/memory.txt)
+
+ Note that setting this option increases fixed memory overhead
+ associated with each page of memory in the system. By this,
+ 20(40)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory
+ usage tracking struct at boot. Total amount of this is printed out
+ at boot.
+
+ Only enable when you're ok with these trade offs and really
+ sure you need the memory resource controller. Even when you enable
+ this, you can set "cgroup_disable=memory" at your boot option to
+ disable memory resource controller and you can avoid overheads.
+ (and lose benefits of memory resource controller)
+
+ This config option also selects MM_OWNER config option, which
+ could in turn add some fork/exit overhead.
+
+ config KERNEL_MEMCG_SWAP
+ bool "Memory Resource Controller Swap Extension"
+ default n
+ depends on KERNEL_MEMCG
+ help
+ Add swap management feature to memory resource controller. When you
+ enable this, you can limit mem+swap usage per cgroup. In other words,
+ when you disable this, memory resource controller has no cares to
+ usage of swap...a process can exhaust all of the swap. This extension
+ is useful when you want to avoid exhaustion swap but this itself
+ adds more overheads and consumes memory for remembering information.
+ Especially if you use 32bit system or small memory system, please
+ be careful about enabling this. When memory resource controller
+ is disabled by boot option, this will be automatically disabled and
+ there will be no overhead from this. Even when you set this config=y,
+ if boot option "swapaccount=0" is set, swap will not be accounted.
+ Now, memory usage of swap_cgroup is 2 bytes per entry. If swap page
+ size is 4096bytes, 512k per 1Gbytes of swap.
+
+ config KERNEL_MEMCG_SWAP_ENABLED
+ bool "Memory Resource Controller Swap Extension enabled by default"
+ default n
+ depends on KERNEL_MEMCG_SWAP
+ help
+ Memory Resource Controller Swap Extension comes with its price in
+ a bigger memory consumption. General purpose distribution kernels
+ which want to enable the feature but keep it disabled by default
+ and let the user enable it by swapaccount boot command line
+ parameter should have this option unselected.
+ For those who want to have the feature enabled by default should
+ select this option (if, for some reason, they need to disable it
+ then swapaccount=0 does the trick).
+
+
+ config KERNEL_MEMCG_KMEM
+ bool "Memory Resource Controller Kernel Memory accounting (EXPERIMENTAL)"
+ default n
+ depends on KERNEL_MEMCG
+ help
+ The Kernel Memory extension for Memory Resource Controller can limit
+ the amount of memory used by kernel objects in the system. Those are
+ fundamentally different from the entities handled by the standard
+ Memory Controller, which are page-based, and can be swapped. Users of
+ the kmem extension can use it to guarantee that no group of processes
+ will ever exhaust kernel resources alone.
+
+ config KERNEL_PERF_EVENTS
+ bool
+ default y if KERNEL_CGROUP_PERF
+
+ config KERNEL_CGROUP_PERF
+ bool "Enable perf_event per-cpu per-container group (cgroup) monitoring"
+ default n
+ help
+ This option extends the per-cpu mode to restrict monitoring to
+ threads which belong to the cgroup specified and run on the
+ designated cpu.
+
+ menuconfig KERNEL_CGROUP_SCHED
+ bool "Group CPU scheduler"
+ default n
+ help
+ This feature lets CPU scheduler recognize task groups and control CPU
+ bandwidth allocation to such task groups. It uses cgroups to group
+ tasks.
+
+ if KERNEL_CGROUP_SCHED
+
+ config KERNEL_FAIR_GROUP_SCHED
+ bool "Group scheduling for SCHED_OTHER"
+ default n
+
+ config KERNEL_CFS_BANDWIDTH
+ bool "CPU bandwidth provisioning for FAIR_GROUP_SCHED"
+ default n
+ depends on KERNEL_FAIR_GROUP_SCHED
+ help
+ This option allows users to define CPU bandwidth rates (limits) for
+ tasks running within the fair group scheduler. Groups with no limit
+ set are considered to be unconstrained and will run with no
+ restriction.
+ See tip/Documentation/scheduler/sched-bwc.txt for more information.
+
+ config KERNEL_RT_GROUP_SCHED
+ bool "Group scheduling for SCHED_RR/FIFO"
+ default n
+ help
+ This feature lets you explicitly allocate real CPU bandwidth
+ to task groups. If enabled, it will also make it impossible to
+ schedule realtime tasks for non-root users until you allocate
+ realtime bandwidth for them.
+
+ endif
+
+ config KERNEL_BLK_CGROUP
+ bool "Block IO controller"
+ default y
+ help
+ Generic block IO controller cgroup interface. This is the common
+ cgroup interface which should be used by various IO controlling
+ policies.
+
+ Currently, CFQ IO scheduler uses it to recognize task groups and
+ control disk bandwidth allocation (proportional time slice allocation)
+ to such task groups. It is also used by bio throttling logic in
+ block layer to implement upper limit in IO rates on a device.
+
+ This option only enables generic Block IO controller infrastructure.
+ One needs to also enable actual IO controlling logic/policy. For
+ enabling proportional weight division of disk bandwidth in CFQ, set
+ CONFIG_CFQ_GROUP_IOSCHED=y; for enabling throttling policy, set
+ CONFIG_BLK_DEV_THROTTLING=y.
+
+ config KERNEL_DEBUG_BLK_CGROUP
+ bool "Enable Block IO controller debugging"
+ default n
+ depends on KERNEL_BLK_CGROUP
+ help
+ Enable some debugging help. Currently it exports additional stat
+ files in a cgroup which can be useful for debugging.
+
+ config KERNEL_NET_CLS_CGROUP
+ bool "Control Group Classifier"
+ default y
+
+ config KERNEL_NETPRIO_CGROUP
+ bool "Network priority cgroup"
+ default y
+
+endif
+
+#
+# Namespace support symbols
+#
+
+config KERNEL_NAMESPACES
+ bool "Enable kernel namespaces"
+ default n
+
+if KERNEL_NAMESPACES
+
+ config KERNEL_UTS_NS
+ bool "UTS namespace"
+ default y
+ help
+ In this namespace tasks see different info provided
+ with the uname() system call
+
+ config KERNEL_IPC_NS
+ bool "IPC namespace"
+ default y
+ help
+ In this namespace tasks work with IPC ids which correspond to
+ different IPC objects in different namespaces.
+
+ config KERNEL_USER_NS
+ bool "User namespace (EXPERIMENTAL)"
+ default y
+ help
+ This allows containers, i.e. vservers, to use user namespaces
+ to provide different user info for different servers.
+
+ config KERNEL_PID_NS
+ bool "PID Namespaces"
+ default y
+ help
+ Support process id namespaces. This allows having multiple
+ processes with the same pid as long as they are in different
+ pid namespaces. This is a building block of containers.
+
+ config KERNEL_NET_NS
+ bool "Network namespace"
+ default y
+ help
+ Allow user space to create what appear to be multiple instances
+ of the network stack.
+
+endif
+
+#
+# LXC related symbols
+#
+
+config KERNEL_LXC_MISC
+ bool "Enable miscellaneous LXC related options"
+ default n
+
+if KERNEL_LXC_MISC
+
+ config KERNEL_DEVPTS_MULTIPLE_INSTANCES
+ bool "Support multiple instances of devpts"
+ default y
+ help
+ Enable support for multiple instances of devpts filesystem.
+ If you want to have isolated PTY namespaces (eg: in containers),
+ say Y here. Otherwise, say N. If enabled, each mount of devpts
+ filesystem with the '-o newinstance' option will create an
+ independent PTY namespace.
+
+ config KERNEL_POSIX_MQUEUE
+ bool "POSIX Message Queues"
+ default n
+ help
+ POSIX variant of message queues is a part of IPC. In POSIX message
+ queues every message has a priority which decides about succession
+ of receiving it by a process. If you want to compile and run
+ programs written e.g. for Solaris with use of its POSIX message
+ queues (functions mq_*) say Y here.
+
+ POSIX message queues are visible as a filesystem called 'mqueue'
+ and can be mounted somewhere if you want to do filesystem
+ operations on message queues.
+
+endif