[PATCH v4 6/6] add documentation about reclaim knob on proc.txt

[Minchan Kim <minchan@kernel.org>]

This patch adds stuff about new reclaim field in proc.txt

Acked-by: Rob Landley <rob@landley.net>
Signed-off-by: Minchan Kim <minchan@kernel.org>
---
 Documentation/filesystems/proc.txt | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index 488c094..ee4cef1 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -136,6 +136,7 @@ Table 1-1: Process specific entries in /proc
  maps		Memory maps to executables and library files	(2.4)
  mem		Memory held by this process
  root		Link to the root directory of this process
+ reclaim	Reclaim pages in this process
  stat		Process status
  statm		Process memory status information
  status		Process status in human readable form
@@ -489,6 +490,25 @@ To clear the soft-dirty bit
 
 Any other value written to /proc/PID/clear_refs will have no effect.
 
+The file /proc/PID/reclaim is used to reclaim pages in this process.
+To reclaim file-backed pages,
+    > echo file > /proc/PID/reclaim
+
+To reclaim anonymous pages,
+    > echo anon > /proc/PID/reclaim
+
+To reclaim all pages,
+    > echo all > /proc/PID/reclaim
+
+Also, you can specify address range of process so part of address space
+will be reclaimed. The format is following as
+    > echo addr size-byte > /proc/PID/reclaim
+
+NOTE: addr should be page-aligned.
+
+Below is example which try to reclaim 2M from 0x100000.
+    > echo 0x100000 2M > /proc/PID/reclaim
+
 The /proc/pid/pagemap gives the PFN, which can be used to find the pageflags
 using /proc/kpageflags and number of times a page is mapped using
 /proc/kpagecount. For detailed explanation, see Documentation/vm/pagemap.txt.
-- 
1.8.2.1

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