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Matthew Ahrens
2d4bbd14fc
ABD's currently track their parent/child relationship. This applies to `abd_get_offset()` and `abd_borrow_buf()`. However, nothing depends on knowing this relationship, it's only used for consistency checks to verify that we are not destroying an ABD that's still in use. When we are creating/destroying ABD's frequently, the performance impact of maintaining these data structures (in particular the atomic increment/decrement operations) can be measurable. This commit removes this verification code on production builds, but keeps it when ZFS_DEBUG is set. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Brian Atkinson <batkinson@lanl.gov> Signed-off-by: Matthew Ahrens <mahrens@delphix.com> Closes #11535