memcgroup: fix and update documentation

- remove trailing " Bytes"s in the demonstration
- remove section 4.4 (feature control_type has been removed)
- fix reference section

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Balbir Singh <balbir@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Documentation/controllers/memory.txt

@@ -170,14 +170,14 @@ NOTE: We can use a suffix (k, K, m, M, g or G) to indicate values in kilo,
 mega or gigabytes.
 
 # cat /cgroups/0/memory.limit_in_bytes
-4194304 Bytes
+4194304
 
 NOTE: The interface has now changed to display the usage in bytes
 instead of pages
 
 We can check the usage:
 # cat /cgroups/0/memory.usage_in_bytes
-1216512 Bytes
+1216512
 
 A successful write to this file does not guarantee a successful set of
 this limit to the value written into the file.  This can be due to a
@@ -187,7 +187,7 @@ this file after a write to guarantee the value committed by the kernel.
 
 # echo -n 1 > memory.limit_in_bytes
 # cat memory.limit_in_bytes
-4096 Bytes
+4096
 
 The memory.failcnt field gives the number of times that the cgroup limit was
 exceeded.
@@ -233,13 +233,6 @@ cgroup might have some charge associated with it, even though all
 tasks have migrated away from it. Such charges are automatically dropped at
 rmdir() if there are no tasks.
 
-4.4 Choosing what to account  -- Page Cache (unmapped) vs RSS (mapped)?
-
-The type of memory accounted by the cgroup can be limited to just
-mapped pages by writing "1" to memory.control_type field
-
-echo -n 1 > memory.control_type
-
 5. TODO
 
 1. Add support for accounting huge pages (as a separate controller)
@@ -262,18 +255,19 @@ References
 3. Emelianov, Pavel. Resource controllers based on process cgroups
    http://lkml.org/lkml/2007/3/6/198
 4. Emelianov, Pavel. RSS controller based on process cgroups (v2)
-   http://lkml.org/lkml/2007/4/9/74
+   http://lkml.org/lkml/2007/4/9/78
 5. Emelianov, Pavel. RSS controller based on process cgroups (v3)
    http://lkml.org/lkml/2007/5/30/244
 6. Menage, Paul. Control Groups v10, http://lwn.net/Articles/236032/
 7. Vaidyanathan, Srinivasan, Control Groups: Pagecache accounting and control
    subsystem (v3), http://lwn.net/Articles/235534/
-8. Singh, Balbir. RSS controller V2 test results (lmbench),
+8. Singh, Balbir. RSS controller v2 test results (lmbench),
    http://lkml.org/lkml/2007/5/17/232
-9. Singh, Balbir. RSS controller V2 AIM9 results
+9. Singh, Balbir. RSS controller v2 AIM9 results
    http://lkml.org/lkml/2007/5/18/1
-10. Singh, Balbir. Memory controller v6 results,
+10. Singh, Balbir. Memory controller v6 test results,
     http://lkml.org/lkml/2007/8/19/36
-11. Singh, Balbir. Memory controller v6, http://lkml.org/lkml/2007/8/17/69
+11. Singh, Balbir. Memory controller introduction (v6),
+    http://lkml.org/lkml/2007/8/17/69
 12. Corbet, Jonathan, Controlling memory use in cgroups,
     http://lwn.net/Articles/243795/