Comments for dlm_dispatch_work is described below:
/* Worker function used during recovery. */
But actually dlm_worker is used by 4 types of dlm message workers:
dlm_assert_master_worker
dlm_deref_lockres_worker
dlm_request_all_locks_worker
dlm_mig_lockres_worker
And the first 2 are not dlm recovery related. Moreover, it will send
DLM_ASSERT_MASTER_MSG to all other nodes in dlm_assert_master_worker.
And it may do a lot of assert master during recovery. In our scenario,
it is tens of thousands.
This will delay the recovery because dlm_worker is a single thread
workqueue and cluster is hanging during dlm recovery.
So I doubt if we can move the assert master to a new workqueue or just
use a system workqueue.
Any suggestions?
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