diff options
Diffstat (limited to 'init/Kconfig')
| -rw-r--r-- | init/Kconfig | 228 |
1 files changed, 118 insertions, 110 deletions
diff --git a/init/Kconfig b/init/Kconfig index 5cff9a980c3..88c10468db4 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -21,6 +21,13 @@ config CONSTRUCTORS depends on !UML default y +config HAVE_IRQ_WORK + bool + +config IRQ_WORK + bool + depends on HAVE_IRQ_WORK + menu "General setup" config EXPERIMENTAL @@ -64,7 +71,7 @@ config BROKEN_ON_SMP config LOCK_KERNEL bool - depends on SMP || PREEMPT + depends on (SMP || PREEMPT) && BKL default y config INIT_ENV_ARG_LIMIT @@ -179,7 +186,7 @@ config KERNEL_LZO depends on HAVE_KERNEL_LZO help Its compression ratio is the poorest among the 4. The kernel - size is about about 10% bigger than gzip; however its speed + size is about 10% bigger than gzip; however its speed (both compression and decompression) is the fastest. endchoice @@ -320,13 +327,19 @@ config AUDITSYSCALL help Enable low-overhead system-call auditing infrastructure that can be used independently or with another kernel subsystem, - such as SELinux. To use audit's filesystem watch feature, please - ensure that INOTIFY is configured. + such as SELinux. + +config AUDIT_WATCH + def_bool y + depends on AUDITSYSCALL + select FSNOTIFY config AUDIT_TREE def_bool y depends on AUDITSYSCALL - select INOTIFY + select FSNOTIFY + +source "kernel/irq/Kconfig" menu "RCU Subsystem" @@ -336,6 +349,7 @@ choice config TREE_RCU bool "Tree-based hierarchical RCU" + depends on !PREEMPT && SMP help This option selects the RCU implementation that is designed for very large SMP system with hundreds or @@ -343,7 +357,7 @@ config TREE_RCU smaller systems. config TREE_PREEMPT_RCU - bool "Preemptable tree-based hierarchical RCU" + bool "Preemptible tree-based hierarchical RCU" depends on PREEMPT help This option selects the RCU implementation that is @@ -361,8 +375,22 @@ config TINY_RCU is not required. This option greatly reduces the memory footprint of RCU. +config TINY_PREEMPT_RCU + bool "Preemptible UP-only small-memory-footprint RCU" + depends on !SMP && PREEMPT + help + This option selects the RCU implementation that is designed + for real-time UP systems. This option greatly reduces the + memory footprint of RCU. + endchoice +config PREEMPT_RCU + def_bool ( TREE_PREEMPT_RCU || TINY_PREEMPT_RCU ) + help + This option enables preemptible-RCU code that is common between + the TREE_PREEMPT_RCU and TINY_PREEMPT_RCU implementations. + config RCU_TRACE bool "Enable tracing for RCU" depends on TREE_RCU || TREE_PREEMPT_RCU @@ -383,9 +411,12 @@ config RCU_FANOUT 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. + large numbers of CPUs. This value must be at least the fourth + root of NR_CPUS, which allows NR_CPUS to be insanely large. + The default value of RCU_FANOUT should be used for production + systems, but if you are stress-testing the RCU implementation + itself, small RCU_FANOUT values allow you to test large-system + code paths on small(er) systems. Select a specific number if testing RCU itself. Take the default if unsure. @@ -487,7 +518,6 @@ if CGROUPS config CGROUP_DEBUG bool "Example debug cgroup subsystem" - depends on CGROUPS default n help This option enables a simple cgroup subsystem that @@ -498,7 +528,6 @@ config CGROUP_DEBUG 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, @@ -507,21 +536,18 @@ config CGROUP_NS config CGROUP_FREEZER bool "Freezer cgroup 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 CGROUPS help This option will let you create and manage CPUSETs which allow dynamically partitioning a system into sets of CPUs and @@ -537,7 +563,6 @@ config PROC_PID_CPUSET config CGROUP_CPUACCT bool "Simple CPU accounting cgroup subsystem" - depends on CGROUPS help Provides a simple Resource Controller for monitoring the total CPU consumed by the tasks in a cgroup. @@ -547,11 +572,10 @@ config RESOURCE_COUNTERS help This option enables controller independent resource accounting 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 + depends on RESOURCE_COUNTERS select MM_OWNER help Provides a memory resource controller that manages both anonymous @@ -573,8 +597,8 @@ config CGROUP_MEM_RES_CTLR could in turn add some fork/exit overhead. config CGROUP_MEM_RES_CTLR_SWAP - bool "Memory Resource Controller Swap Extension(EXPERIMENTAL)" - depends on CGROUP_MEM_RES_CTLR && SWAP && EXPERIMENTAL + bool "Memory Resource Controller Swap Extension" + depends on CGROUP_MEM_RES_CTLR && SWAP help Add swap management feature to memory resource controller. When you enable this, you can limit mem+swap usage per cgroup. In other words, @@ -592,7 +616,7 @@ config CGROUP_MEM_RES_CTLR_SWAP menuconfig CGROUP_SCHED bool "Group CPU scheduler" - depends on EXPERIMENTAL && CGROUPS + depends on EXPERIMENTAL default n help This feature lets CPU scheduler recognize task groups and control CPU @@ -621,7 +645,7 @@ endif #CGROUP_SCHED config BLK_CGROUP tristate "Block IO controller" - depends on CGROUPS && BLOCK + depends on BLOCK default n ---help--- Generic block IO controller cgroup interface. This is the common @@ -630,11 +654,14 @@ config BLK_CGROUP Currently, CFQ IO scheduler uses it to recognize task groups and control disk bandwidth allocation (proportional time slice allocation) - to such task groups. + 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 in CFQ for it - to take effect. (CONFIG_CFQ_GROUP_IOSCHED=y). + One needs to also enable actual IO controlling logic/policy. For + enabling proportional weight division of disk bandwidth in CFQ seti + CONFIG_CFQ_GROUP_IOSCHED=y and for enabling throttling policy set + CONFIG_BLK_THROTTLE=y. See Documentation/cgroups/blkio-controller.txt for more information. @@ -648,57 +675,7 @@ config DEBUG_BLK_CGROUP endif # CGROUPS -config MM_OWNER - bool - -config SYSFS_DEPRECATED - bool - -config SYSFS_DEPRECATED_V2 - bool "enable deprecated sysfs features to support old userspace tools" - depends on SYSFS - default n - select SYSFS_DEPRECATED - help - This option switches the layout of sysfs to the deprecated - version. Do not use it on recent distributions. - - 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 - "<subsystem>:<name>" 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 RELAY - bool "Kernel->user space relay support (formerly relayfs)" - help - This option enables support for relay interface support in - certain file systems (such as debugfs). - It is designed to provide an efficient mechanism for tools and - facilities to relay large amounts of data from kernel space to - user space. - - If unsure, say N. - -config NAMESPACES +menuconfig NAMESPACES bool "Namespaces support" if EMBEDDED default !EMBEDDED help @@ -707,48 +684,102 @@ config NAMESPACES or same user id or pid may refer to different tasks when used in different namespaces. +if NAMESPACES + config UTS_NS bool "UTS namespace" - depends on NAMESPACES + default y help In this namespace tasks see different info provided with the uname() system call config IPC_NS bool "IPC namespace" - depends on NAMESPACES && (SYSVIPC || POSIX_MQUEUE) + depends on (SYSVIPC || POSIX_MQUEUE) + default y help In this namespace tasks work with IPC ids which correspond to different IPC objects in different namespaces. config USER_NS bool "User namespace (EXPERIMENTAL)" - depends on NAMESPACES && EXPERIMENTAL + depends on EXPERIMENTAL + default y help This allows containers, i.e. vservers, to use user namespaces to provide different user info for different servers. If unsure, say N. config PID_NS - bool "PID Namespaces (EXPERIMENTAL)" - default n - depends on NAMESPACES && EXPERIMENTAL + 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. - Unless you want to work with an experimental feature - say N here. - config NET_NS bool "Network namespace" - default n - depends on NAMESPACES && EXPERIMENTAL && NET + depends on NET + default y help Allow user space to create what appear to be multiple instances of the network stack. +endif # NAMESPACES + +config MM_OWNER + bool + +config SYSFS_DEPRECATED + bool "enable deprecated sysfs features to support old userspace tools" + depends on SYSFS + default n + help + This option adds code that switches the layout of the "block" class + devices, to not show up in /sys/class/block/, but only in + /sys/block/. + + This switch is only active when the sysfs.deprecated=1 boot option is + passed or the SYSFS_DEPRECATED_V2 option is set. + + This option allows new kernels to run on old distributions and tools, + which might get confused by /sys/class/block/. Since 2007/2008 all + major distributions and tools handle this just fine. + + Recent distributions and userspace tools after 2009/2010 depend on + the existence of /sys/class/block/, and will not work with this + option enabled. + + Only if you are using a new kernel on an old distribution, you might + need to say Y here. + +config SYSFS_DEPRECATED_V2 + bool "enabled deprecated sysfs features by default" + default n + depends on SYSFS + depends on SYSFS_DEPRECATED + help + Enable deprecated sysfs by default. + + See the CONFIG_SYSFS_DEPRECATED option for more details about this + option. + + Only if you are using a new kernel on an old distribution, you might + need to say Y here. Even then, odds are you would not need it + enabled, you can always pass the boot option if absolutely necessary. + +config RELAY + bool "Kernel->user space relay support (formerly relayfs)" + help + This option enables support for relay interface support in + certain file systems (such as debugfs). + It is designed to provide an efficient mechanism for tools and + facilities to relay large amounts of data from kernel space to + user space. + + If unsure, say N. + config BLK_DEV_INITRD bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support" depends on BROKEN || !FRV @@ -983,6 +1014,7 @@ config PERF_EVENTS default y if (PROFILING || PERF_COUNTERS) depends on HAVE_PERF_EVENTS select ANON_INODES + select IRQ_WORK help Enable kernel support for various performance events provided by software and hardware. @@ -1143,30 +1175,6 @@ config TRACEPOINTS source "arch/Kconfig" -config SLOW_WORK - default n - bool - help - The slow work thread pool provides a number of dynamically allocated - threads that can be used by the kernel to perform operations that - take a relatively long time. - - An example of this would be CacheFiles doing a path lookup followed - by a series of mkdirs and a create call, all of which have to touch - disk. - - See Documentation/slow-work.txt. - -config SLOW_WORK_DEBUG - bool "Slow work debugging through debugfs" - default n - depends on SLOW_WORK && DEBUG_FS - help - Display the contents of the slow work run queue through debugfs, - including items currently executing. - - See Documentation/slow-work.txt. - endmenu # General setup config HAVE_GENERIC_DMA_COHERENT |