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-rw-r--r--Documentation/device-mapper/cache.txt50
1 files changed, 28 insertions, 22 deletions
diff --git a/Documentation/device-mapper/cache.txt b/Documentation/device-mapper/cache.txt
index 719320b5ed3f..63fd7cfa4cf1 100644
--- a/Documentation/device-mapper/cache.txt
+++ b/Documentation/device-mapper/cache.txt
@@ -217,36 +217,42 @@ the characteristics of a specific policy, always request it by name.
Status
------
-<#used metadata blocks>/<#total metadata blocks> <#read hits> <#read misses>
-<#write hits> <#write misses> <#demotions> <#promotions> <#blocks in cache>
-<#dirty> <#features> <features>* <#core args> <core args>* <#policy args>
-<policy args>*
-
-#used metadata blocks : Number of metadata blocks used
-#total metadata blocks : Total number of metadata blocks
-#read hits : Number of times a READ bio has been mapped
+<metadata block size> <#used metadata blocks>/<#total metadata blocks>
+<cache block size> <#used cache blocks>/<#total cache blocks>
+<#read hits> <#read misses> <#write hits> <#write misses>
+<#demotions> <#promotions> <#dirty> <#features> <features>*
+<#core args> <core args>* <#policy args> <policy args>*
+
+metadata block size : Fixed block size for each metadata block in
+ sectors
+#used metadata blocks : Number of metadata blocks used
+#total metadata blocks : Total number of metadata blocks
+cache block size : Configurable block size for the cache device
+ in sectors
+#used cache blocks : Number of blocks resident in the cache
+#total cache blocks : Total number of cache blocks
+#read hits : Number of times a READ bio has been mapped
to the cache
-#read misses : Number of times a READ bio has been mapped
+#read misses : Number of times a READ bio has been mapped
to the origin
-#write hits : Number of times a WRITE bio has been mapped
+#write hits : Number of times a WRITE bio has been mapped
to the cache
-#write misses : Number of times a WRITE bio has been
+#write misses : Number of times a WRITE bio has been
mapped to the origin
-#demotions : Number of times a block has been removed
+#demotions : Number of times a block has been removed
from the cache
-#promotions : Number of times a block has been moved to
+#promotions : Number of times a block has been moved to
the cache
-#blocks in cache : Number of blocks resident in the cache
-#dirty : Number of blocks in the cache that differ
+#dirty : Number of blocks in the cache that differ
from the origin
-#feature args : Number of feature args to follow
-feature args : 'writethrough' (optional)
-#core args : Number of core arguments (must be even)
-core args : Key/value pairs for tuning the core
+#feature args : Number of feature args to follow
+feature args : 'writethrough' (optional)
+#core args : Number of core arguments (must be even)
+core args : Key/value pairs for tuning the core
e.g. migration_threshold
-#policy args : Number of policy arguments to follow (must be even)
-policy args : Key/value pairs
- e.g. 'sequential_threshold 1024
+#policy args : Number of policy arguments to follow (must be even)
+policy args : Key/value pairs
+ e.g. sequential_threshold
Messages
--------