On Wed, Aug 09, 2017 at 11:21:38AM -0500, Steve Wise wrote:

quoted

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I don't know.  I read the workqueue doc on WQ_MEM_RECLAIM, but I don't

know

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how
to tell if iw_cm needs this or not.  Can you give me an example of a

workqueue

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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

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if that would include rdma CMs or not...

Many of the workqueues in infiniband/core use WQ_MEM_RECLAIM: cma, iwcm,

mad,

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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?

Consider that the ib_core can be used to back storage. Ie consider a
situation where iSER/NFS/SRP needs to reconnect to respond to kernel
paging/reclaim.

On the surface it seems reasonable to me that these are on a reclaim
path?

Jason

hmm.  That seems reasonable.  Then I would think the nvme_rdma would also need
to be using a reclaim workqueue.

Sagi, Do you think I should add a private workqueue with WQ_MEM_RECLAIM to
nvme_rdma vs using the system_wq?  nvme/target probably needs one also...

Steve.



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