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3642 dsl_scan_active() should not issue I/O to determine if async destroying is active 3643 txg_delay should not hold the tc_lock Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed by: Adam Leventhal <ahl@delphix.com> Approved by: Gordon Ross <gwr@nexenta.com> References: https://www.illumos.org/issues/3642 https://www.illumos.org/issues/3643 illumos/illumos-gate@4a92375 Ported-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #1775 Porting Notes: 1. The alignment assumptions for the tx_cpu structure assume that a kmutex_t is 8 bytes. This isn't true under Linux but tc_pad[] was adjusted anyway for consistency since this structure was never carefully aligned in ZoL. If careful alignment does impact performance significantly this should be reworked to be portable.
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