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Alexander Motin
409aad3f33
While block cloning operation from the beginning was made per-vdev, before this change most of its data were protected by two pool- wide locks. It created lots of lock contention in many workload. This change makes most of block cloning data structures per-vdev, which allows to lock them separately. The only pool-wide lock now it spa_brt_lock, protecting array of per-vdev pointers and in most cases taken as reader. Also this splits per-vdev locks into three different ones: bv_pending_lock protects the AVL-tree of pending operations in open context, bv_mos_entries_lock protects BRT ZAP object from while being prefetched, and bv_lock protects the rest of per-vdev context during TXG commit process. There should be no functional difference aside of some optimizations. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Pawel Jakub Dawidek <pjd@FreeBSD.org> Reviewed-by: Brian Atkinson <batkinson@lanl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes #16740