memcg: Fix init/Kconfig documentation

[Balbir Singh <balbir@linux.vnet.ibm.com>]

The memory resource controller no longer has a struct page overhead
associated with it. The init/Kconfig help has been replaced with
something more suitable based on the current implementation.

Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com>
---
 init/Kconfig |   11 ++++-------
 1 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/init/Kconfig b/init/Kconfig
index 113c74c..1847f87 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -404,13 +404,10 @@ config CGROUP_MEM_RES_CTLR
 	  Provides a memory resource 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 resource controller.
+	  The config option adds a small memory overhead proportional to the
+	  size of memory. The controller can be disabled at run time by
+	  using the cgroup_disable=memory option, at which point the overhead
+	  disappears.
 
 	  This config option also selects MM_OWNER config option, which
 	  could in turn add some fork/exit overhead.
-- 
1.5.6.3


        Balbir

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