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This is needed by many services to function properly and as all modern distributions got it enabled, it starts to be a de-facto standard, i.e. user-space starts to silently depend on it. This also pulls in EXPORTFS, however, the kernel binary size increases only a little. On ARM systems comes down to 800 bytes uncompressed and about 200 bytes compressed size. On MIPS systems it's about 1.2 kB size increase of the LZMA compressed kernel. v2: use menuconfig option instead of just enabling the option Signed-off-by: Daniel Golle <daniel@makrotopia.org> SVN-Revision: 44765
490 lines
14 KiB
Plaintext
490 lines
14 KiB
Plaintext
# Copyright (C) 2006-2014 OpenWrt.org
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#
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# This is free software, licensed under the GNU General Public License v2.
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# See /LICENSE for more information.
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#
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config KERNEL_PRINTK
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bool "Enable support for printk"
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default y
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config KERNEL_CRASHLOG
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bool "Crash logging"
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depends on !(arm || powerpc || sparc || TARGET_uml)
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default y
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config KERNEL_SWAP
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bool "Support for paging of anonymous memory (swap)"
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default y
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config KERNEL_DEBUG_FS
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bool "Compile the kernel with debug filesystem enabled"
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default y
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help
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debugfs is a virtual file system that kernel developers use to put
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debugging files into. Enable this option to be able to read and
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write to these files. Many common debugging facilities, such as
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ftrace, require the existence of debugfs.
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config KERNEL_PERF_EVENTS
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bool
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default n
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config KERNEL_PROFILING
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bool "Compile the kernel with profiling enabled"
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default n
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select KERNEL_PERF_EVENTS
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help
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Enable the extended profiling support mechanisms used by profilers such
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as OProfile.
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config KERNEL_KALLSYMS
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bool "Compile the kernel with symbol table information"
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default y
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help
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This will give you more information in stack traces from kernel oopses.
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config KERNEL_FTRACE
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bool "Compile the kernel with tracing support"
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depends on !TARGET_uml
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default n
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config KERNEL_FTRACE_SYSCALLS
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bool "Trace system calls"
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depends on KERNEL_FTRACE
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default n
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config KERNEL_ENABLE_DEFAULT_TRACERS
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bool "Trace process context switches and events"
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depends on KERNEL_FTRACE
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default n
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config KERNEL_DEBUG_KERNEL
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bool
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default n
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config KERNEL_DEBUG_INFO
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bool "Compile the kernel with debug information"
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default y
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select KERNEL_DEBUG_KERNEL
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help
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This will compile your kernel and modules with debug information.
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config KERNEL_DEBUG_LL_UART_NONE
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bool
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default n
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depends on arm
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config KERNEL_DEBUG_LL
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bool
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default n
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depends on arm
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select KERNEL_DEBUG_LL_UART_NONE
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help
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ARM low level debugging.
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config KERNEL_DYNAMIC_DEBUG
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bool "Compile the kernel with dynamic printk"
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select KERNEL_DEBUG_FS
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default n
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help
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Compiles debug level messages into the kernel, which would not
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otherwise be available at runtime. These messages can then be
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enabled/disabled based on various levels of scope - per source file,
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function, module, format string, and line number. This mechanism
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implicitly compiles in all pr_debug() and dev_dbg() calls, which
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enlarges the kernel text size by about 2%.
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config KERNEL_EARLY_PRINTK
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bool "Compile the kernel with early printk"
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default y if TARGET_bcm53xx
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default n
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depends on arm
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select KERNEL_DEBUG_KERNEL
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select KERNEL_DEBUG_LL if arm
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help
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Compile the kernel with early printk support. This is only useful for
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debugging purposes to send messages over the serial console in early boot.
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Enable this to debug early boot problems.
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config KERNEL_AIO
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bool "Compile the kernel with asynchronous IO support"
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default n
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config KERNEL_DIRECT_IO
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bool "Compile the kernel with direct IO support"
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default n
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config KERNEL_MAGIC_SYSRQ
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bool "Compile the kernel with SysRq support"
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default y
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config KERNEL_COREDUMP
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bool
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config KERNEL_ELF_CORE
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bool "Enable process core dump support"
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select KERNEL_COREDUMP
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default y
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config KERNEL_PROVE_LOCKING
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bool "Enable kernel lock checking"
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select KERNEL_DEBUG_KERNEL
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default n
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config KERNEL_PRINTK_TIME
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bool "Enable printk timestamps"
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default y
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config KERNEL_SLUB_DEBUG
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bool
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config KERNEL_SLUB_DEBUG_ON
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bool
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config KERNEL_SLABINFO
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select KERNEL_SLUB_DEBUG
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select KERNEL_SLUB_DEBUG_ON
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bool "Enable /proc slab debug info"
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config KERNEL_PROC_PAGE_MONITOR
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bool "Enable /proc page monitoring"
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config KERNEL_RELAY
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bool
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config KERNEL_KEXEC
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bool "Enable kexec support"
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config USE_RFKILL
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bool "Enable rfkill support"
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default RFKILL_SUPPORT
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config USE_SPARSE
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bool "Enable sparse check during kernel build"
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default n
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#
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# CGROUP support symbols
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#
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config KERNEL_CGROUPS
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bool "Enable kernel cgroups"
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default n
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if KERNEL_CGROUPS
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config KERNEL_CGROUP_DEBUG
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bool "Example debug cgroup subsystem"
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default n
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help
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This option enables a simple cgroup subsystem that
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exports useful debugging information about the cgroups
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framework.
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config KERNEL_FREEZER
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bool
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default y if KERNEL_CGROUP_FREEZER
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config KERNEL_CGROUP_FREEZER
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bool "Freezer cgroup subsystem"
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default y
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help
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Provides a way to freeze and unfreeze all tasks in a
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cgroup.
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config KERNEL_CGROUP_DEVICE
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bool "Device controller for cgroups"
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default y
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help
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Provides a cgroup implementing whitelists for devices which
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a process in the cgroup can mknod or open.
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config KERNEL_CPUSETS
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bool "Cpuset support"
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default n
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help
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This option will let you create and manage CPUSETs which
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allow dynamically partitioning a system into sets of CPUs and
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Memory Nodes and assigning tasks to run only within those sets.
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This is primarily useful on large SMP or NUMA systems.
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config KERNEL_PROC_PID_CPUSET
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bool "Include legacy /proc/<pid>/cpuset file"
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default n
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depends on KERNEL_CPUSETS
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config KERNEL_CGROUP_CPUACCT
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bool "Simple CPU accounting cgroup subsystem"
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default n
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help
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Provides a simple Resource Controller for monitoring the
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total CPU consumed by the tasks in a cgroup.
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config KERNEL_RESOURCE_COUNTERS
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bool "Resource counters"
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default n
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help
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This option enables controller independent resource accounting
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infrastructure that works with cgroups.
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config KERNEL_MM_OWNER
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bool
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default y if KERNEL_MEMCG
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config KERNEL_MEMCG
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bool "Memory Resource Controller for Control Groups"
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default n
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depends on KERNEL_RESOURCE_COUNTERS
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help
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Provides a memory resource controller that manages both anonymous
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memory and page cache. (See Documentation/cgroups/memory.txt)
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Note that setting this option increases fixed memory overhead
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associated with each page of memory in the system. By this,
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20(40)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory
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usage tracking struct at boot. Total amount of this is printed out
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at boot.
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Only enable when you're ok with these tradeoffs and really
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sure you need the memory resource controller. Even when you enable
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this, you can set "cgroup_disable=memory" at your boot option to
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disable memory resource controller and you can avoid overheads
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(but lose benefits of memory resource controller).
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This config option also selects MM_OWNER config option, which
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could in turn add some fork/exit overhead.
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config KERNEL_MEMCG_SWAP
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bool "Memory Resource Controller Swap Extension"
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default n
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depends on KERNEL_MEMCG
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help
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Add swap management feature to memory resource controller. When you
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enable this, you can limit mem+swap usage per cgroup. In other words,
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when you disable this, memory resource controller has no cares to
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usage of swap...a process can exhaust all of the swap. This extension
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is useful when you want to avoid exhaustion swap but this itself
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adds more overheads and consumes memory for remembering information.
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Especially if you use 32bit system or small memory system, please
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be careful about enabling this. When memory resource controller
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is disabled by boot option, this will be automatically disabled and
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there will be no overhead from this. Even when you set this config=y,
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if boot option "swapaccount=0" is set, swap will not be accounted.
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Now, memory usage of swap_cgroup is 2 bytes per entry. If swap page
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size is 4096bytes, 512k per 1Gbytes of swap.
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config KERNEL_MEMCG_SWAP_ENABLED
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bool "Memory Resource Controller Swap Extension enabled by default"
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default n
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depends on KERNEL_MEMCG_SWAP
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help
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Memory Resource Controller Swap Extension comes with its price in
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a bigger memory consumption. General purpose distribution kernels
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which want to enable the feature but keep it disabled by default
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and let the user enable it by swapaccount boot command line
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parameter should have this option unselected.
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Those who want to have the feature enabled by default should
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select this option (if, for some reason, they need to disable it,
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then swapaccount=0 does the trick).
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config KERNEL_MEMCG_KMEM
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bool "Memory Resource Controller Kernel Memory accounting (EXPERIMENTAL)"
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default n
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depends on KERNEL_MEMCG
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help
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The Kernel Memory extension for Memory Resource Controller can limit
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the amount of memory used by kernel objects in the system. Those are
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fundamentally different from the entities handled by the standard
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Memory Controller, which are page-based, and can be swapped. Users of
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the kmem extension can use it to guarantee that no group of processes
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will ever exhaust kernel resources alone.
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config KERNEL_CGROUP_PERF
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bool "Enable perf_event per-cpu per-container group (cgroup) monitoring"
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select KERNEL_PERF_EVENTS
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default n
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help
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This option extends the per-cpu mode to restrict monitoring to
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threads which belong to the cgroup specified and run on the
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designated cpu.
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menuconfig KERNEL_CGROUP_SCHED
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bool "Group CPU scheduler"
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default n
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help
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This feature lets CPU scheduler recognize task groups and control CPU
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bandwidth allocation to such task groups. It uses cgroups to group
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tasks.
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if KERNEL_CGROUP_SCHED
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config KERNEL_FAIR_GROUP_SCHED
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bool "Group scheduling for SCHED_OTHER"
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default n
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config KERNEL_CFS_BANDWIDTH
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bool "CPU bandwidth provisioning for FAIR_GROUP_SCHED"
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default n
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depends on KERNEL_FAIR_GROUP_SCHED
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help
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This option allows users to define CPU bandwidth rates (limits) for
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tasks running within the fair group scheduler. Groups with no limit
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set are considered to be unconstrained and will run with no
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restriction.
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See tip/Documentation/scheduler/sched-bwc.txt for more information.
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config KERNEL_RT_GROUP_SCHED
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bool "Group scheduling for SCHED_RR/FIFO"
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default n
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help
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This feature lets you explicitly allocate real CPU bandwidth
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to task groups. If enabled, it will also make it impossible to
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schedule realtime tasks for non-root users until you allocate
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realtime bandwidth for them.
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endif
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config KERNEL_BLK_CGROUP
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bool "Block IO controller"
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default y
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help
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Generic block IO controller cgroup interface. This is the common
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cgroup interface which should be used by various IO controlling
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policies.
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Currently, CFQ IO scheduler uses it to recognize task groups and
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control disk bandwidth allocation (proportional time slice allocation)
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to such task groups. It is also used by bio throttling logic in
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block layer to implement upper limit in IO rates on a device.
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This option only enables generic Block IO controller infrastructure.
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One needs to also enable actual IO controlling logic/policy. For
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enabling proportional weight division of disk bandwidth in CFQ, set
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CONFIG_CFQ_GROUP_IOSCHED=y; for enabling throttling policy, set
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CONFIG_BLK_DEV_THROTTLING=y.
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config KERNEL_DEBUG_BLK_CGROUP
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bool "Enable Block IO controller debugging"
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default n
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depends on KERNEL_BLK_CGROUP
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help
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Enable some debugging help. Currently it exports additional stat
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files in a cgroup which can be useful for debugging.
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config KERNEL_NET_CLS_CGROUP
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bool "Control Group Classifier"
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default y
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config KERNEL_NETPRIO_CGROUP
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bool "Network priority cgroup"
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default y
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endif
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#
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# Namespace support symbols
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#
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config KERNEL_NAMESPACES
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bool "Enable kernel namespaces"
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default n
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if KERNEL_NAMESPACES
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config KERNEL_UTS_NS
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bool "UTS namespace"
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default y
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help
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In this namespace, tasks see different info provided
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with the uname() system call.
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config KERNEL_IPC_NS
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bool "IPC namespace"
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default y
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help
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In this namespace, tasks work with IPC ids which correspond to
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different IPC objects in different namespaces.
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config KERNEL_USER_NS
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bool "User namespace (EXPERIMENTAL)"
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default y
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help
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This allows containers, i.e. vservers, to use user namespaces
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to provide different user info for different servers.
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config KERNEL_PID_NS
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bool "PID Namespaces"
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default y
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help
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Support process id namespaces. This allows having multiple
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processes with the same pid as long as they are in different
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pid namespaces. This is a building block of containers.
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config KERNEL_NET_NS
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bool "Network namespace"
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default y
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help
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Allow user space to create what appear to be multiple instances
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of the network stack.
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endif
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#
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# LXC related symbols
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#
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config KERNEL_LXC_MISC
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bool "Enable miscellaneous LXC related options"
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default n
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if KERNEL_LXC_MISC
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config KERNEL_DEVPTS_MULTIPLE_INSTANCES
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bool "Support multiple instances of devpts"
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default y
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help
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Enable support for multiple instances of devpts filesystem.
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If you want to have isolated PTY namespaces (eg: in containers),
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say Y here. Otherwise, say N. If enabled, each mount of devpts
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filesystem with the '-o newinstance' option will create an
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independent PTY namespace.
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config KERNEL_POSIX_MQUEUE
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bool "POSIX Message Queues"
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default y
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help
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POSIX variant of message queues is a part of IPC. In POSIX message
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queues every message has a priority which decides about succession
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of receiving it by a process. If you want to compile and run
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programs written e.g. for Solaris with use of its POSIX message
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queues (functions mq_*) say Y here.
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POSIX message queues are visible as a filesystem called 'mqueue'
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and can be mounted somewhere if you want to do filesystem
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operations on message queues.
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endif
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config KERNEL_SECCOMP
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bool "Enable seccomp support"
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depends on !(TARGET_uml || TARGET_avr32)
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default n
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help
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Build kernel with support for seccomp.
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config KERNEL_SECCOMP_FILTER
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bool "Enable seccomp filter support"
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depends on KERNEL_SECCOMP
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default n
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help
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Build kernel with support for seccomp BPF programs.
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config KERNEL_FHANDLE
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bool "Enable open by fhandle syscalls"
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default n
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help
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Build kernel with support for open by fhandle syscalls
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