X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=init%2FKconfig;h=a724a149bf3f232aba760c6b584db3f52dfd7e32;hb=c077719be8e9e6b55702117513d1b5f41d80404a;hp=98ebf3725412fefa00ca22244fd50489602f1c36;hpb=d47846c5866b7d98a1173c86a39d810a06647329;p=safe%2Fjmp%2Flinux-2.6 diff --git a/init/Kconfig b/init/Kconfig index 98ebf37..a724a14 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -13,6 +13,7 @@ config DEFCONFIG_LIST default "/lib/modules/$UNAME_RELEASE/.config" default "/etc/kernel-config" default "/boot/config-$UNAME_RELEASE" + default "$ARCH_DEFCONFIG" default "arch/$ARCH/defconfig" menu "General setup" @@ -170,7 +171,7 @@ config BSD_PROCESS_ACCT_V3 process and it's parent. Note that this file format is incompatible with previous v0/v1/v2 file formats, so you will need updated tools for processing it. A preliminary version of these tools is available - at . + at . config TASKSTATS bool "Export task/process statistics through netlink (EXPERIMENTAL)" @@ -259,75 +260,50 @@ config IKCONFIG_PROC config LOG_BUF_SHIFT int "Kernel log buffer size (16 => 64KB, 17 => 128KB)" range 12 21 - default 17 if S390 || LOCKDEP - default 16 if X86_NUMAQ || IA64 - default 15 if SMP - default 14 + default 17 help Select kernel log buffer size as a power of 2. - Defaults and Examples: - 17 => 128 KB for S/390 - 16 => 64 KB for x86 NUMAQ or IA-64 - 15 => 32 KB for SMP - 14 => 16 KB for uniprocessor + Examples: + 17 => 128 KB + 16 => 64 KB + 15 => 32 KB + 14 => 16 KB 13 => 8 KB 12 => 4 KB -config CGROUPS - bool "Control Group support" - help - This option will let you use process cgroup subsystems - such as Cpusets - - Say N if unsure. - -config CGROUP_DEBUG - bool "Example debug cgroup subsystem" - depends on CGROUPS - help - This option enables a simple cgroup subsystem that - exports useful debugging information about the cgroups - framework - - Say N if unsure - -config CGROUP_NS - bool "Namespace cgroup subsystem" - depends on CGROUPS - help - Provides a simple namespace cgroup subsystem to - provide hierarchical naming of sets of namespaces, - for instance virtual servers and checkpoint/restart - jobs. - -config CPUSETS - bool "Cpuset support" - depends on SMP && CGROUPS - 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. - - Say N if unsure. +# +# Architectures with an unreliable sched_clock() should select this: +# +config HAVE_UNSTABLE_SCHED_CLOCK + bool config GROUP_SCHED bool "Group CPU scheduler" - default y + depends on EXPERIMENTAL + default n help This feature lets CPU scheduler recognize task groups and control CPU bandwidth allocation to such task groups. + In order to create a group from arbitrary set of processes, use + CONFIG_CGROUPS. (See Control Group support.) config FAIR_GROUP_SCHED bool "Group scheduling for SCHED_OTHER" depends on GROUP_SCHED - default y + default GROUP_SCHED config RT_GROUP_SCHED bool "Group scheduling for SCHED_RR/FIFO" depends on EXPERIMENTAL depends on GROUP_SCHED default n + help + This feature lets you explicitly allocate real CPU bandwidth + to users or control groups (depending on the "Basis for grouping tasks" + setting below. If enabled, it will also make it impossible to + schedule realtime tasks for non-root users until you allocate + realtime bandwidth for them. + See Documentation/scheduler/sched-rt-group.txt for more information. choice depends on GROUP_SCHED @@ -352,6 +328,66 @@ config CGROUP_SCHED endchoice +menu "Control Group support" +config CGROUPS + bool "Control Group support" + help + This option add support for grouping sets of processes together, for + use with process control subsystems such as Cpusets, CFS, memory + controls or device isolation. + See + - Documentation/cpusets.txt (Cpusets) + - Documentation/scheduler/sched-design-CFS.txt (CFS) + - Documentation/cgroups/ (features for grouping, isolation) + - Documentation/controllers/ (features for resource control) + + Say N if unsure. + +config CGROUP_DEBUG + bool "Example debug cgroup subsystem" + depends on CGROUPS + default n + help + This option enables a simple cgroup subsystem that + exports useful debugging information about the cgroups + framework + + Say N if unsure + +config CGROUP_NS + bool "Namespace cgroup subsystem" + depends on CGROUPS + help + Provides a simple namespace cgroup subsystem to + provide hierarchical naming of sets of namespaces, + for instance virtual servers and checkpoint/restart + jobs. + +config CGROUP_FREEZER + bool "control group freezer subsystem" + depends on CGROUPS + help + Provides a way to freeze and unfreeze all tasks in a + cgroup. + +config CGROUP_DEVICE + bool "Device controller for cgroups" + depends on CGROUPS && EXPERIMENTAL + help + Provides a cgroup implementing whitelists for devices which + a process in the cgroup can mknod or open. + +config CPUSETS + bool "Cpuset support" + depends on SMP && CGROUPS + 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. + + Say N if unsure. + config CGROUP_CPUACCT bool "Simple CPU accounting cgroup subsystem" depends on CGROUPS @@ -366,46 +402,86 @@ config RESOURCE_COUNTERS infrastructure that works with cgroups depends on CGROUPS +config CGROUP_MEM_RES_CTLR + bool "Memory Resource Controller for Control Groups" + depends on CGROUPS && RESOURCE_COUNTERS + select MM_OWNER + help + Provides a memory resource controller that manages both anonymous + memory and page cache. (See Documentation/controllers/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 MM_OWNER + bool + +config CGROUP_MEM_RES_CTLR_SWAP + bool "Memory Resource Controller Swap Extension(EXPERIMENTAL)" + depends on CGROUP_MEM_RES_CTLR && SWAP && EXPERIMENTAL + 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 "noswapaccount" is set, swap will not be accounted. + + +endmenu + config SYSFS_DEPRECATED bool config SYSFS_DEPRECATED_V2 - bool "Create deprecated sysfs files" + bool "Create deprecated sysfs layout for older userspace tools" depends on SYSFS default y select SYSFS_DEPRECATED help - This option creates deprecated symlinks such as the - "device"-link, the :-link, and the - "bus"-link. It may also add deprecated key in the - uevent environment. - None of these features or values should be used today, as - they export driver core implementation details to userspace - or export properties which can't be kept stable across kernel - releases. - - If enabled, this option will also move any device structures - that belong to a class, back into the /sys/class hierarchy, in - order to support older versions of udev and some userspace - programs. - - If you are using a distro with the most recent userspace - packages, it should be safe to say N here. - -config CGROUP_MEM_CONT - bool "Memory controller for cgroups" - depends on CGROUPS && RESOURCE_COUNTERS - help - Provides a memory controller that manages both page cache and - RSS memory. - - Note that setting this option increases fixed memory overhead - associated with each page of memory in the system by 4/8 bytes - and also increases cache misses because struct page on many 64bit - systems will not fit into a single cache line anymore. - - Only enable when you're ok with these trade offs and really - sure you need the memory controller. + This option switches the layout of sysfs to the deprecated + version. + + The current sysfs layout features a unified device tree at + /sys/devices/, which is able to express a hierarchy between + class devices. If the deprecated option is set to Y, the + unified device tree is split into a bus device tree at + /sys/devices/ and several individual class device trees at + /sys/class/. The class and bus devices will be connected by + ":" and the "device" links. The "block" + class devices, will not show up in /sys/class/block/. Some + subsystems will suppress the creation of some devices which + depend on the unified device tree. + + This option is not a pure compatibility option that can + be safely enabled on newer distributions. It will change the + layout of sysfs to the non-extensible deprecated version, + and disable some features, which can not be exported without + confusing older userspace tools. Since 2007/2008 all major + distributions do not enable this option, and ship no tools which + depend on the deprecated layout or this option. + + If you are using a new kernel on an older distribution, or use + older userspace tools, you might need to say Y here. Do not say Y, + if the original kernel, that came with your distribution, has + this option set to N. config PROC_PID_CPUSET bool "Include legacy /proc//cpuset file" @@ -459,7 +535,7 @@ config PID_NS default n depends on NAMESPACES && EXPERIMENTAL help - Suport process id namespaces. This allows having multiple + Support process id namespaces. This allows having multiple process with the same pid as long as they are in different pid namespaces. This is a building block of containers. @@ -489,17 +565,13 @@ source "usr/Kconfig" endif config CC_OPTIMIZE_FOR_SIZE - bool "Optimize for size (Look out for broken compilers!)" + bool "Optimize for size" default y - depends on ARM || H8300 || SUPERH || EXPERIMENTAL help Enabling this option will pass "-Os" instead of "-O2" to gcc resulting in a smaller kernel. - WARNING: some versions of gcc may generate incorrect code with this - option. If problems are observed, a gcc upgrade may be needed. - - If unsure, say N. + If unsure, say Y. config SYSCTL bool @@ -514,7 +586,7 @@ menuconfig EMBEDDED config UID16 bool "Enable 16-bit UID system calls" if EMBEDDED - depends on ARM || BLACKFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && SPARC32_COMPAT) || UML || (X86_64 && IA32_EMULATION) + depends on ARM || BLACKFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && COMPAT) || UML || (X86_64 && IA32_EMULATION) default y help This enables the legacy 16-bit UID syscall wrappers. @@ -554,6 +626,13 @@ config KALLSYMS_ALL Say N. +config KALLSYMS_STRIP_GENERATED + bool "Strip machine generated symbols from kallsyms" + depends on KALLSYMS_ALL + default y + help + Say N if you want kallsyms to retain even machine generated symbols. + config KALLSYMS_EXTRA_PASS bool "Do an extra kallsyms pass" depends on KALLSYMS @@ -601,6 +680,14 @@ config ELF_CORE help Enable support for generating core dumps. Disabling saves about 4k. +config PCSPKR_PLATFORM + bool "Enable PC-Speaker support" if EMBEDDED + depends on ALPHA || X86 || MIPS || PPC_PREP || PPC_CHRP || PPC_PSERIES + default y + help + This option allows to disable the internal PC-Speaker + support, saving some memory. + config COMPAT_BRK bool "Disable heap randomization" default y @@ -682,6 +769,14 @@ config SHMEM option replaces shmem and tmpfs with the much simpler ramfs code, which may be appropriate on small systems without swap. +config AIO + bool "Enable AIO support" if EMBEDDED + default y + help + This option enables POSIX asynchronous I/O which may by used + by some high performance threaded applications. Disabling + this option saves about 7k. + config VM_EVENT_COUNTERS default y bool "Enable VM event counters for /proc/vmstat" if EMBEDDED @@ -691,10 +786,19 @@ config VM_EVENT_COUNTERS on EMBEDDED systems. /proc/vmstat will only show page counts if VM event counters are disabled. +config PCI_QUIRKS + default y + bool "Enable PCI quirk workarounds" if EMBEDDED + depends on PCI + help + This enables workarounds for various PCI chipset + bugs/quirks. Disable this only if your target machine is + unaffected by PCI quirks. + config SLUB_DEBUG default y bool "Enable SLUB debugging support" if EMBEDDED - depends on SLUB + depends on SLUB && SYSFS help SLUB has extensive debug support features. Disabling these can result in significant savings in code size. This also disables @@ -712,8 +816,7 @@ config SLAB help The regular slab allocator that is established and known to work well in all environments. It organizes cache hot objects in - per cpu and per node queues. SLAB is the default choice for - a slab allocator. + per cpu and per node queues. config SLUB bool "SLUB (Unqueued Allocator)" @@ -722,7 +825,8 @@ config SLUB instead of managing queues of cached objects (SLAB approach). Per cpu caching is realized using slabs of objects instead of queues of objects. SLUB can use memory efficiently - and has enhanced diagnostics. + and has enhanced diagnostics. SLUB is the default choice for + a slab allocator. config SLOB depends on EMBEDDED @@ -740,40 +844,38 @@ config PROFILING Say Y here to enable the extended profiling support mechanisms used by profilers such as OProfile. +# +# Place an empty function call at each tracepoint site. Can be +# dynamically changed for a probe function. +# +config TRACEPOINTS + bool + config MARKERS bool "Activate markers" + depends on TRACEPOINTS help Place an empty function call at each marker site. Can be dynamically changed for a probe function. source "arch/Kconfig" -config PROC_PAGE_MONITOR - default y - depends on PROC_FS && MMU - bool "Enable /proc page monitoring" if EMBEDDED - help - Various /proc files exist to monitor process memory utilization: - /proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap, - /proc/kpagecount, and /proc/kpageflags. Disabling these - interfaces will reduce the size of the kernel by approximately 4kb. - endmenu # General setup +config HAVE_GENERIC_DMA_COHERENT + bool + default n + config SLABINFO bool depends on PROC_FS - depends on SLAB || SLUB + depends on SLAB || SLUB_DEBUG default y config RT_MUTEXES boolean select PLIST -config TINY_SHMEM - default !SHMEM - bool - config BASE_SMALL int default 0 if BASE_FULL @@ -799,14 +901,23 @@ menuconfig MODULES If unsure, say Y. +if MODULES + +config MODULE_FORCE_LOAD + bool "Forced module loading" + default n + help + Allow loading of modules without version information (ie. modprobe + --force). Forced module loading sets the 'F' (forced) taint flag and + is usually a really bad idea. + config MODULE_UNLOAD bool "Module unloading" - depends on MODULES help Without this option you will not be able to unload any modules (note that some modules may not be unloadable - anyway), which makes your kernel slightly smaller and - simpler. If unsure, say Y. + anyway), which makes your kernel smaller, faster + and simpler. If unsure, say Y. config MODULE_FORCE_UNLOAD bool "Forced module unloading" @@ -820,7 +931,6 @@ config MODULE_FORCE_UNLOAD config MODVERSIONS bool "Module versioning support" - depends on MODULES help Usually, you have to use modules compiled with your kernel. Saying Y here makes it sometimes possible to use modules @@ -831,7 +941,6 @@ config MODVERSIONS config MODULE_SRCVERSION_ALL bool "Source checksum for all modules" - depends on MODULES help Modules which contain a MODULE_VERSION get an extra "srcversion" field inserted into their modinfo section, which contains a @@ -841,17 +950,16 @@ config MODULE_SRCVERSION_ALL the version). With this option, such a "srcversion" field will be created for all modules. If unsure, say N. -config KMOD - bool "Automatic kernel module loading" - depends on MODULES +endif # MODULES + +config INIT_ALL_POSSIBLE + bool help - Normally when you have selected some parts of the kernel to - be created as kernel modules, you must load them (using the - "modprobe" command) before you can use them. If you say Y - here, some parts of the kernel will be able to load modules - automatically: when a part of the kernel needs a module, it - runs modprobe with the appropriate arguments, thereby - loading the module if it is available. If unsure, say Y. + Back when each arch used to define their own cpu_online_map and + cpu_possible_map, some of them chose to initialize cpu_possible_map + with all 1s, and others with all 0s. When they were centralised, + it was better to provide this option than to break all the archs + and have several arch maintainers persuing me down dark alleys. config STOP_MACHINE bool @@ -866,16 +974,8 @@ config PREEMPT_NOTIFIERS bool choice - prompt "RCU implementation type:" + prompt "RCU Implementation" default CLASSIC_RCU - help - This allows you to choose either the classic RCU implementation - that is designed for best read-side performance on non-realtime - systems, or the preemptible RCU implementation for best latency - on realtime systems. Note that some kernel preemption modes - will restrict your choice. - - Select the default if you are unsure. config CLASSIC_RCU bool "Classic RCU" @@ -884,7 +984,14 @@ config CLASSIC_RCU designed for best read-side performance on non-realtime systems. - Say Y if you are unsure. + Select this option if you are unsure. + +config TREE_RCU + bool "Tree-based hierarchical RCU" + help + This option selects the RCU implementation that is + designed for very large SMP system with hundreds or + thousands of CPUs. config PREEMPT_RCU bool "Preemptible RCU" @@ -897,6 +1004,59 @@ config PREEMPT_RCU now-naive assumptions about each RCU read-side critical section remaining on a given CPU through its execution. +endchoice + +config RCU_TRACE + bool "Enable tracing for RCU" + depends on TREE_RCU || PREEMPT_RCU + help + This option provides tracing in RCU which presents stats + in debugfs for debugging RCU implementation. + + Say Y here if you want to enable RCU tracing Say N if you are unsure. -endchoice +config RCU_FANOUT + int "Tree-based hierarchical RCU fanout value" + range 2 64 if 64BIT + range 2 32 if !64BIT + depends on TREE_RCU + default 64 if 64BIT + default 32 if !64BIT + help + This option controls the fanout of hierarchical implementations + of RCU, allowing RCU to work efficiently on machines with + large numbers of CPUs. This value must be at least the cube + root of NR_CPUS, which allows NR_CPUS up to 32,768 for 32-bit + systems and up to 262,144 for 64-bit systems. + + Select a specific number if testing RCU itself. + Take the default if unsure. + +config RCU_FANOUT_EXACT + bool "Disable tree-based hierarchical RCU auto-balancing" + depends on TREE_RCU + default n + help + This option forces use of the exact RCU_FANOUT value specified, + regardless of imbalances in the hierarchy. This is useful for + testing RCU itself, and might one day be useful on systems with + strong NUMA behavior. + + Without RCU_FANOUT_EXACT, the code will balance the hierarchy. + + Say N if unsure. + +config TREE_RCU_TRACE + def_bool RCU_TRACE && TREE_RCU + select DEBUG_FS + help + This option provides tracing for the TREE_RCU implementation, + permitting Makefile to trivially select kernel/rcutree_trace.c. + +config PREEMPT_RCU_TRACE + def_bool RCU_TRACE && PREEMPT_RCU + select DEBUG_FS + help + This option provides tracing for the PREEMPT_RCU implementation, + permitting Makefile to trivially select kernel/rcupreempt_trace.c.