"Tree RCU": scalable classic RCU implementation

[safe/jmp/linux-2.6] / init / Kconfig

diff --git a/init/Kconfig b/init/Kconfig
index 7008267..9dd7958 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -299,6 +299,13 @@ config CGROUP_NS
           for instance virtual servers and checkpoint/restart
           jobs.
 
           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
 config CGROUP_DEVICE
        bool "Device controller for cgroups"
        depends on CGROUPS && EXPERIMENTAL


@@ -347,7 +354,7 @@ config RT_GROUP_SCHED
          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.
          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/sched-rt-group.txt for more information.
+         See Documentation/scheduler/sched-rt-group.txt for more information.

 
 choice
        depends on GROUP_SCHED
 
 choice
        depends on GROUP_SCHED


@@ -394,16 +401,20 @@ config CGROUP_MEM_RES_CTLR
        depends on CGROUPS && RESOURCE_COUNTERS
        select MM_OWNER
        help
        depends on CGROUPS && RESOURCE_COUNTERS
        select MM_OWNER
        help

-         Provides a memory resource controller that manages both page cache and
-         RSS memory.
+         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
 
          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.
+         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
 
          Only enable when you're ok with these trade offs and really

-         sure you need the memory resource controller.
+         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)

 
          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.


@@ -713,6 +724,14 @@ config SHMEM
          option replaces shmem and tmpfs with the much simpler ramfs code,
          which may be appropriate on small systems without swap.
 
          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
 config VM_EVENT_COUNTERS
        default y
        bool "Enable VM event counters for /proc/vmstat" if EMBEDDED


@@ -722,6 +741,15 @@ config VM_EVENT_COUNTERS
          on EMBEDDED systems.  /proc/vmstat will only show page counts
          if VM event counters are disabled.
 
          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
 config SLUB_DEBUG
        default y
        bool "Enable SLUB debugging support" if EMBEDDED


@@ -743,8 +771,7 @@ config SLAB
        help
          The regular slab allocator that is established and known to work
          well in all environments. It organizes cache hot objects in
        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)"
 
 config SLUB
        bool "SLUB (Unqueued Allocator)"


@@ -753,7 +780,8 @@ 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
           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
 
 config SLOB
        depends on EMBEDDED


@@ -771,12 +799,12 @@ config PROFILING
          Say Y here to enable the extended profiling support mechanisms used
          by profilers such as OProfile.
 
          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
 config TRACEPOINTS

-       bool "Activate tracepoints"
-       default y
-       help
-         Place an empty function call at each tracepoint site. Can be
-         dynamically changed for a probe function.
+       bool

 
 config MARKERS
        bool "Activate markers"
 
 config MARKERS
        bool "Activate markers"


@@ -786,16 +814,6 @@ config MARKERS
 
 source "arch/Kconfig"
 
 
 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
 endmenu                # General setup
 
 config HAVE_GENERIC_DMA_COHERENT


@@ -910,10 +928,16 @@ source "block/Kconfig"
 config PREEMPT_NOTIFIERS
        bool
 
 config PREEMPT_NOTIFIERS
        bool
 

-config CLASSIC_RCU
-       def_bool !PREEMPT_RCU
+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
        help

-         This option selects the classic RCU implementation that is
-         designed for best read-side performance on non-realtime
-         systems.  Classic RCU is the default.  Note that the
-         PREEMPT_RCU symbol is used to select/deselect this option.
+         This option provides tracing for the PREEMPT_RCU implementation,
+         permitting Makefile to trivially select kernel/rcupreempt_trace.c.