On 1/11/21 4:41 AM, Anand Jain wrote:

Add round-robin read policy to route the read IO to the next device in the
round-robin order. The chunk allocation and thus the stripe-index follows
the order of free space available on devices. So to make the round-robin
effective it shall follow the devid order instead of the stripe-index
order.

Signed-off-by: Anand Jain <redacted>
--
RFC because: Provides terrible performance with the fio tests.
I am not yet sure if there is any io workload or a block layer
tuning that shall make this policy better. As of now just an
experimental patch.

Just drop this one, if we can't find a reason to use it then don't bother adding 
the code.  The other options have real world valuable uses, so stick with those. 
  Thanks,

Josef