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zram: introduce per-device debug_stat sysfs node

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debug_stat sysfs is read-only and represents various debugging data that
zram developers may need.  This file is not meant to be used by anyone
else: its content is not documented and will change any time w/o any
notice.  Therefore, the output of debug_stat file contains a version
string.  To avoid any confusion, we will increase the version number
every time we modify the output.

At the moment this file exports only one value -- the number of
re-compressions, IOW, the number of times compression fast path has
failed.  This stat is temporary any will be useful in case if any
per-cpu compression streams regressions will be reported.

Link: http://lkml.kernel.org/r/20160513230834.GB26763@bbox
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Sergey Senozhatsky <[email protected]>
Signed-off-by: Minchan Kim <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Sergey Senozhatsky 2016-05-20 17:00:02 -07:00 • committed by Linus Torvalds
commit 623e47fc64
4 changed files with 32 additions and 0 deletions
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9
Documentation/ABI/testing/sysfs-block-zram
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@ -166,3 +166,12 @@ Description:
The mm_stat file is read-only and represents device's mm
statistics (orig_data_size, compr_data_size, etc.) in a format
similar to block layer statistics file format.
What: /sys/block/zram<id>/debug_stat
Date: July 2016
Contact: Sergey Senozhatsky <[email protected]>
Description:
The debug_stat file is read-only and represents various
device's debugging info useful for kernel developers. Its
format is not documented intentionally and may change
anytime without any notice.