Re: [PATCH v6] blk-mq: Avoid that a completion can be ignored for BLK_EH_RESET_TIMER

On Sat, 2018-04-21 at 22:55 +0800, jianchao.wang wrote:

So we have a __deadline as below: deadline gen state

...

______________|____|_|

           \___ __/ 
               V
          granularity 

and even we usually have a 30~60s timeout, but we should support a 1s granularity at least. How to decide the granularity ?

Your diagram shows that the uppermost bits are used for the deadline. What I proposed is to use the lower 32 bits for the deadline such that we again have a resolution of 1/HZ.

Bart.