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| author | Sergey Senozhatsky <sergey.senozhatsky@gmail.com> | 2016-05-21 00:00:02 (GMT) |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-05-21 00:58:30 (GMT) |
| commit | 623e47fc64f8de480b322b7ed68855f97137e2a5 (patch) | |
| tree | 0d44e61d20246d5a5329f0e1a84ac78d06668e83 /Documentation | |
| parent | 43209ea2d17aae1540d4e28274e36404f72702f2 (diff) | |
| download | linux-623e47fc64f8de480b322b7ed68855f97137e2a5.tar.xz | |
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')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-block-zram | 9 | ||||
| -rw-r--r-- | Documentation/blockdev/zram.txt | 1 |
2 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-block-zram b/Documentation/ABI/testing/sysfs-block-zram index 2e69e83..4518d30 100644 --- a/Documentation/ABI/testing/sysfs-block-zram +++ b/Documentation/ABI/testing/sysfs-block-zram @@ -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 <sergey.senozhatsky@gmail.com> +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. diff --git a/Documentation/blockdev/zram.txt b/Documentation/blockdev/zram.txt index d88f0c7..13100fb 100644 --- a/Documentation/blockdev/zram.txt +++ b/Documentation/blockdev/zram.txt @@ -172,6 +172,7 @@ 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 ======= |