Kconfig: SLUB is the default slab allocator

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

diff --git a/init/Kconfig b/init/Kconfig
index 113c74c07da411eefafbe0e03dbbb24dc527ec33..226da2733c1e7f8a885d8db735f11605136fa103 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -401,16 +401,20 @@ config CGROUP_MEM_RES_CTLR
        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
-         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
-         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.
@@ -739,7 +743,8 @@ config VM_EVENT_COUNTERS
 
 config PCI_QUIRKS
        default y
-       bool "Enable PCI quirk workarounds" if EMBEDDED && PCI
+       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
@@ -766,8 +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
-         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)"
@@ -776,7 +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
-          and has enhanced diagnostics.
+          and has enhanced diagnostics. SLUB is the default choice for
+          a slab allocator.
 
 config SLOB
        depends on EMBEDDED