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authorSergey Senozhatsky <sergey.senozhatsky@gmail.com>2015-04-16 02:16:03 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-04-16 02:35:21 +0300
commit2f6a3bed7347ee94fe57b3501fddaa646a26d890 (patch)
treeddbe3dca838dea06f3639394bf36bd5b4f10ee31 /Documentation
parent77ba015f9d5c584226a634753e9b318cb272cd41 (diff)
downloadlinux-2f6a3bed7347ee94fe57b3501fddaa646a26d890.tar.xz
zram: export new 'io_stat' sysfs attrs
Per-device `zram<id>/io_stat' file provides accumulated I/O statistics of particular zram device in a format similar to block layer statistics. The file consists of a single line and represents the following stats (separated by whitespace): failed_reads failed_writes invalid_io notify_free Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Acked-by: Minchan Kim <minchan@kernel.org> Cc: Nitin Gupta <ngupta@vflare.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/ABI/testing/sysfs-block-zram9
-rw-r--r--Documentation/blockdev/zram.txt11
2 files changed, 20 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.
diff --git a/Documentation/blockdev/zram.txt b/Documentation/blockdev/zram.txt
index 971765ed5ac1..9610be3e9d36 100644
--- a/Documentation/blockdev/zram.txt
+++ b/Documentation/blockdev/zram.txt
@@ -133,6 +133,17 @@ File /sys/block/zram<id>/stat
Represents block layer statistics. Read Documentation/block/stat.txt for
details.
+File /sys/block/zram<id>/io_stat
+
+The stat file represents device's I/O statistics not accounted by block
+layer and, thus, not available in zram<id>/stat file. It consists of a
+single line of text and contains the following stats separated by
+whitespace:
+ failed_reads
+ failed_writes
+ invalid_io
+ notify_free
+
8) Deactivate:
swapoff /dev/zram0
umount /dev/zram1