MFprojects/camlock r254460: Remove locking from taskqueue_member().  The list of threads is static during the taskqueue life cycle, so there is no need to protect it, taking quite congested lock several more times for each ZFS I/O.
MFprojects/camlock r254460:
Remove locking from taskqueue_member().  The list of threads is static
during the taskqueue life cycle, so there is no need to protect it,
taking quite congested lock several more times for each ZFS I/O.

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