[PATCH] memcg: add documentation for memory.numastat API.

[Ying Han <yinghan@google.com>]

Signed-off-by: Ying Han <yinghan@google.com>
---
 Documentation/cgroups/memory.txt |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
index 2d7e527..b81be08 100644
--- a/Documentation/cgroups/memory.txt
+++ b/Documentation/cgroups/memory.txt
@@ -71,6 +71,7 @@ Brief summary of control files.
  memory.move_charge_at_immigrate # set/show controls of moving charges
  memory.oom_control		 # set/show oom controls.
  memory.async_control		 # set control for asynchronous memory reclaim
+ memory.numa_stat		 # show the number of memory usage per numa node
 
 1. History
 
@@ -477,6 +478,15 @@ value for efficient access. (Of course, when necessary, it's synchronized.)
 If you want to know more exact memory usage, you should use RSS+CACHE(+SWAP)
 value in memory.stat(see 5.2).
 
+5.6 numa_stat
+
+This is similar to numa_maps but per-memcg basis. This is useful to add visibility
+of numa locality information in memcg since the pages are allowed to be allocated
+at any physical node. One of the usecase is evaluating application performance by
+combining this information with the cpu allocation to the application.
+
+We export "total", "file", "anon" and "unevictable" pages per-node for each memcg.
+
 6. Hierarchy support
 
 The memory controller supports a deep hierarchy and hierarchical accounting.
-- 
1.7.3.1

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