rcu: move Kconfig menu

[linux-2.6-omap-h63xx.git] / init / Kconfig

diff --git a/init/Kconfig b/init/Kconfig
index 52847eec7398cbda5b0ffe5c65446208bdd1008a..989f58b03958da73a1aae1b40e03f5e3c5905d2a 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -238,6 +238,98 @@ config AUDIT_TREE
        def_bool y
        depends on AUDITSYSCALL && INOTIFY
 
        def_bool y
        depends on AUDITSYSCALL && INOTIFY
 

+menu "RCU Subsystem"
+
+choice
+       prompt "RCU Implementation"
+       default CLASSIC_RCU
+
+config CLASSIC_RCU
+       bool "Classic RCU"
+       help
+         This option selects the classic RCU implementation that is
+         designed for best read-side performance on non-realtime
+         systems.
+
+         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"
+       depends on PREEMPT
+       help
+         This option reduces the latency of the kernel by making certain
+         RCU sections preemptible. Normally RCU code is non-preemptible, if
+         this option is selected then read-only RCU sections become
+         preemptible. This helps latency, but may expose bugs due to
+         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.
+
+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.
+
+endmenu # "RCU Subsystem"
+

 config IKCONFIG
        tristate "Kernel .config support"
        ---help---
 config IKCONFIG
        tristate "Kernel .config support"
        ---help---


@@ -271,59 +363,6 @@ config LOG_BUF_SHIFT
                     13 =>  8 KB
                     12 =>  4 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
-       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.
-

 #
 # Architectures with an unreliable sched_clock() should select this:
 #
 #
 # Architectures with an unreliable sched_clock() should select this:
 #


@@ -337,6 +376,8 @@ config GROUP_SCHED
        help
          This feature lets CPU scheduler recognize task groups and control CPU
          bandwidth allocation to such task groups.
        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"
 
 config FAIR_GROUP_SCHED
        bool "Group scheduling for SCHED_OTHER"


@@ -379,6 +420,66 @@ config CGROUP_SCHED
 
 endchoice
 
 
 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
 config CGROUP_CPUACCT
        bool "Simple CPU accounting cgroup subsystem"
        depends on CGROUPS


@@ -393,9 +494,6 @@ config RESOURCE_COUNTERS
           infrastructure that works with cgroups
        depends on CGROUPS
 
           infrastructure that works with cgroups
        depends on CGROUPS
 

-config MM_OWNER
-       bool
-

 config CGROUP_MEM_RES_CTLR
        bool "Memory Resource Controller for Control Groups"
        depends on CGROUPS && RESOURCE_COUNTERS
 config CGROUP_MEM_RES_CTLR
        bool "Memory Resource Controller for Control Groups"
        depends on CGROUPS && RESOURCE_COUNTERS


@@ -414,36 +512,68 @@ config CGROUP_MEM_RES_CTLR
          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.
          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 contoller)
+         (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.
 
 
          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
 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
        depends on SYSFS
        default y
        select SYSFS_DEPRECATED
        help

-         This option creates deprecated symlinks such as the
-         "device"-link, the <subsystem>:<name>-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.
+         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
+         "<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 PROC_PID_CPUSET
        bool "Include legacy /proc/<pid>/cpuset file"
 
 config PROC_PID_CPUSET
        bool "Include legacy /proc/<pid>/cpuset file"


@@ -838,10 +968,6 @@ config RT_MUTEXES
        boolean
        select PLIST
 
        boolean
        select PLIST
 

-config TINY_SHMEM
-       default !SHMEM
-       bool
-

 config BASE_SMALL
        int
        default 0 if BASE_FULL
 config BASE_SMALL
        int
        default 0 if BASE_FULL


@@ -939,90 +1065,3 @@ source "block/Kconfig"
 config PREEMPT_NOTIFIERS
        bool
 
 config PREEMPT_NOTIFIERS
        bool
 

-choice
-       prompt "RCU Implementation"
-       default CLASSIC_RCU
-
-config CLASSIC_RCU
-       bool "Classic RCU"
-       help
-         This option selects the classic RCU implementation that is
-         designed for best read-side performance on non-realtime
-         systems.
-
-         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"
-       depends on PREEMPT
-       help
-         This option reduces the latency of the kernel by making certain
-         RCU sections preemptible. Normally RCU code is non-preemptible, if
-         this option is selected then read-only RCU sections become
-         preemptible. This helps latency, but may expose bugs due to
-         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.
-
-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.