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zram: export new 'io_stat' sysfs attrs

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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>
This commit is contained in:
Sergey Senozhatsky
2015-04-15 16:16:03 -07:00
committed by Linus Torvalds
parent 77ba015f9d
commit 2f6a3bed73
3 changed files with 40 additions and 0 deletions
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9
Documentation/ABI/testing/sysfs-block-zram
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@@ -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.