quoted

quoted

The WARNING seems to be due to nvmet_rdma_queue_connect() calling
flush_scheduled_work() while in the upcall from the RDMA_CM.  It I running

on

quoted

quoted

the iw_cm event workqueue, which is created with WQ_MEM_RECLAIM set.

I'm

quoted

not

quoted

sure what this WARNING is telling me.  Does the iw_cm workqueue NOT need
WQ_MEM_RECLAIM set?  Or is there some other issue with the nvmet/rdma

code doing

quoted

work flushing in the iw_cm workq context?

This flush is designed to prevent nvmet-rdma from having too much
inflight resources in case of a high pace of controller teardown and
establishment (like you trigger in your test).

queue teardowns are run on system_wq, does iw_cm needs memory
reclamation protection?

I don't know.  I read the workqueue doc on WQ_MEM_RECLAIM, but I don't know
how
to tell if iw_cm needs this or not.  Can you give me an example of a workqueue
that _does_ need WQ_MEM_RECLAIM?  I _think_ it means your workqueue is
required
to run something that would get triggered by the oom OS code, but I don't know
if that would include rdma CMs or not...

Many of the workqueues in infiniband/core use WQ_MEM_RECLAIM: cma, iwcm, mad,
multicast, sa_query, and ucma. 

Hey Sean, do you have any insight into whether the CMA modules really need
WQ_MEM_RECLAIM for their workqueues?

Does anyone else know?

Thanks!

Steve.


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