Commits on Mar 22, 2024

1. ZAP: Massively switch to _by_dnode() interfaces …

   Before this change ZAP called dnode_hold() for almost every block
   access, that was clearly visible in profiler under heavy load, such
   as BRT.  This patch makes it always hold the dnode reference between
   zap_lockdir() and zap_unlockdir().  It allows to avoid most of dnode
   operations between those.  It also adds several new _by_dnode() APIs
   to ZAP and uses them in BRT code.  Also adds dmu_prefetch_by_dnode()
   variant and uses it in the ZAP code.
   
   After this there remains only one call to dmu_buf_dnode_enter(),
   which seems to be unneeded.  So remove the call and the functions.
   
   Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
   Sponsored by:	iXsystems, Inc.

   

   amotin committed Mar 22, 2024
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