[SPDK] SPDK Thread and Nvmf QPair migration

[SPDK] SPDK Thread and Nvmf QPair migration

[Hari Kadayam]

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We are trying to add SPDK to our existing async based framework and would like to do at spdk_thread level instead of reactor. I think we can run multiple spdk_threads in a single system thread by polling each thread in a round robin fashion. However, how do we move the spdk_thread into a different system thread, should we pause and pass the object to other thread and resume? What happens to the NVMf poll group which is associated in that thread. Are they movable to a different system thread? My understanding is that nvmf q-pair once associated needs to stick that poll group. Is that the same for system threads as well (meaning does it use any thread local variables) which stops them from moving to a different thread.

Thanks