I'm using dm-cache in writeback mode and I'm trying to figure out how I can see the cache stats in "real-time" (poll every second). Like, I want to poll for the values in this data structure: https://github.com/torvalds/linux/blob/be48bcf004f9d0c9207ff21d0edb3b42f253829e/drivers/md/dm-cache-target.c#L283-L295.
But, I'm at a loss for how to do that. There are also these DMEMIT messages that I'm really interested in printing to dmesg or subscribing to, or whatever, but I don't know how to access them (CONFIG_DM_DEBUG didn't do anything useful - which makes sense after reading the source a bit): https://github.com/torvalds/linux/blob/be48bcf004f9d0c9207ff21d0edb3b42f253829e/drivers/md/dm-cache-target.c#L3184-L3197. Can you help a brother out? Thanks! -- John Rinehart
