From 623e47fc64f8de480b322b7ed68855f97137e2a5 Mon Sep 17 00:00:00 2001 From: Sergey Senozhatsky Date: Fri, 20 May 2016 17:00:02 -0700 Subject: 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 Signed-off-by: Minchan Kim Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Documentation/ABI/testing/sysfs-block-zram | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'Documentation/ABI') diff --git a/Documentation/ABI/testing/sysfs-block-zram b/Documentation/ABI/testing/sysfs-block-zram index 2e69e83bf510..4518d30b8c2e 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/debug_stat +Date: July 2016 +Contact: Sergey Senozhatsky +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. -- cgit v1.2.3