1 files changed, 25 insertions, 0 deletions

diff --git a/Documentation/controllers/memory.txt b/Documentation/controllers/memory.txt
index 09e1c737d28..d71745cc2f0 100644
--- a/Documentation/controllers/memory.txt
+++ b/Documentation/controllers/memory.txt
@@ -289,6 +289,31 @@ will be charged as a new owner of it.
   Because rmdir() moves all pages to parent, some out-of-use page caches can be
   moved to the parent. If you want to avoid that, force_empty will be useful.
 
+5.2 stat file
+  memory.stat file includes following statistics (now)
+        cache                   - # of pages from page-cache and shmem.
+        rss                     - # of pages from anonymous memory.
+        pgpgin                  - # of event of charging
+        pgpgout                 - # of event of uncharging
+        active_anon             - # of pages on active lru of anon, shmem.
+        inactive_anon           - # of pages on active lru of anon, shmem
+        active_file             - # of pages on active lru of file-cache
+        inactive_file           - # of pages on inactive lru of file cache
+        unevictable             - # of pages cannot be reclaimed.(mlocked etc)
+
+        Below is depend on CONFIG_DEBUG_VM.
+        inactive_ratio          - VM inernal parameter. (see mm/page_alloc.c)
+        recent_rotated_anon     - VM internal parameter. (see mm/vmscan.c)
+        recent_rotated_file     - VM internal parameter. (see mm/vmscan.c)
+        recent_scanned_anon     - VM internal parameter. (see mm/vmscan.c)
+        recent_scanned_file     - VM internal parameter. (see mm/vmscan.c)
+
+  Memo:
+        recent_rotated means recent frequency of lru rotation.
+        recent_scanned means recent # of scans to lru.
+        showing for better debug please see the code for meanings.
+
+
 6. Hierarchy support
 
 The memory controller supports a deep hierarchy and hierarchical accounting.