1 files changed, 9 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-block-zram b/Documentation/ABI/testing/sysfs-block-zram
index 91ad7071b9e8..a7f622f9bcf6 100644
--- a/Documentation/ABI/testing/sysfs-block-zram
+++ b/Documentation/ABI/testing/sysfs-block-zram
@@ -149,3 +149,12 @@ Description:
                 The compact file is write-only and trigger compaction for
                 allocator zrm uses. The allocator moves some objects so that
                 it could free fragment space.
+
+What:           /sys/block/zram<id>/io_stat
+Date:           August 2015
+Contact:        Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
+Description:
+                The io_stat file is read-only and accumulates device's I/O
+                statistics not accounted by block layer. For example,
+                failed_reads, failed_writes, etc. File format is similar to
+                block layer statistics file format.