[PATCH 8/8] doc: update Documentation/sysctl/vm.txt

[Xishi Qiu <qiuxishi@huawei.com>]

Update the doc.

Signed-off-by: Xishi Qiu <qiuxishi@huawei.com>
---
 Documentation/sysctl/vm.txt |   43 +++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 43 insertions(+), 0 deletions(-)

diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt
index dd9d0e3..8008e53 100644
--- a/Documentation/sysctl/vm.txt
+++ b/Documentation/sysctl/vm.txt
@@ -20,6 +20,10 @@ Currently, these files are in /proc/sys/vm:
 
 - admin_reserve_kbytes
 - block_dump
+- cache_limit_mbytes
+- cache_limit_ratio
+- cache_reclaim_s
+- cache_reclaim_weight
 - compact_memory
 - dirty_background_bytes
 - dirty_background_ratio
@@ -97,6 +101,45 @@ information on block I/O debugging is in Documentation/laptops/laptop-mode.txt.
 
 ==============================================================
 
+cache_limit_mbytes
+
+This is used to limit page cache amount. The input unit is MB, value range
+is from 0 to totalram_pages. If this is set to 0, it will not limit page cache.
+When written to the file, cache_limit_ratio will be updated too.
+
+The default value is 0.
+
+==============================================================
+
+cache_limit_ratio
+
+This is used to limit page cache amount. The input unit is percent, value
+range is from 0 to 100. If this is set to 0, it will not limit page cache.
+When written to the file, cache_limit_mbytes will be updated too.
+
+The default value is 0.
+
+==============================================================
+
+cache_reclaim_s
+
+This is used to reclaim page cache in circles. The input unit is second,
+the minimum value is 0. If this is set to 0, it will disable the feature.
+
+The default value is 0.
+
+==============================================================
+
+cache_reclaim_weight
+
+This is used to speed up page cache reclaim. It depend on enabling
+cache_limit_mbytes/cache_limit_ratio or cache_reclaim_s. Value range is
+from 1(slow) to 100(fast).
+
+The default value is 1.
+
+==============================================================
+
 compact_memory
 
 Available only when CONFIG_COMPACTION is set. When 1 is written to the file,
-- 
1.6.0.2


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