Messages in this thread | | | Date | Wed, 13 Dec 2017 08:09:13 -0800 | From | Tejun Heo <> | Subject | Re: [PATCH 6/6] blk-mq: remove REQ_ATOM_STARTED |
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Hello,
On Wed, Dec 13, 2017 at 11:05:11AM +0800, jianchao.wang wrote: > Just don't quite understand the strict definition of "generation" you said. > A allocation->free cycle is a generation ? or a idle->in-flight cycle is a > generation? The idle->in-flight cycle could include the requeue case as above. > Can you clarify this?
So, a request is
* IN_FLIGHT, if it can be completed by the lower level driver
* COMPLETE, if the lower level driver indicated completion but block layer is still processing.
* IDLE, if neither of the above two.
and generation is bumped up on IDLE -> IN_FLIGHT to distinguish different IN_FLIGHT instances.
Thanks.
-- tejun
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