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-rw-r--r--Documentation/controllers/memory.txt25
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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.