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| author | Sergey Senozhatsky <sergey.senozhatsky@gmail.com> | 2016-05-20 17:00:02 -0700 |
|---|---|---|
| committer | Mister Oyster <oysterized@gmail.com> | 2017-09-25 21:16:39 +0200 |
| commit | aa987496ae920cd82e1d8fa87fa2b32282b86a86 (patch) | |
| tree | ccc0928ecdc7b5f20c087cf157954104f67ae7c6 /Documentation/blockdev | |
| parent | 30c7a1dfad0f030b4910bd0ec60be9f019902657 (diff) | |
zram: introduce per-device debug_stat sysfs node
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/20160511134553.12655-1-sergey.senozhatsky@gmail.com
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/blockdev')
| -rw-r--r-- | Documentation/blockdev/zram.txt | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/blockdev/zram.txt b/Documentation/blockdev/zram.txt index de8cb5407..de51bcb37 100644 --- a/Documentation/blockdev/zram.txt +++ b/Documentation/blockdev/zram.txt @@ -136,6 +136,7 @@ mem_limit RW the maximum amount of memory ZRAM can use to store pages_compacted RO the number of pages freed during compaction (available only via zram<id>/mm_stat node) compact WO trigger memory compaction +debug_stat RO this file is used for zram debugging purposes WARNING ======= |