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

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