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Differential D2995

lockstat: fix spurious rw-spin events
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Authored by markj on Jul 5 2015, 2:54 AM.
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Summary

When acquiring a read lock, don't increment spin_cnt until after the
first attempt to acquire the lock. Otherwise lockstat:::rw-spin fires
even in the uncontended case.

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rS FreeBSD src repository - subversion
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markj updated this revision to Diff 6698.Jul 5 2015, 2:54 AM
markj retitled this revision from to lockstat: fix spurious rw-spin events.
markj edited the test plan for this revision. (Show Details)
markj updated this object.
Herald added a subscriber: imp. · View Herald TranscriptJul 5 2015, 2:54 AM
markj added a reviewer: avg.Jul 5 2015, 2:57 AM
markj added a project: DTrace.
markj abandoned this revision.Jul 25 2015, 2:07 AM

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sys/
kern/
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Diff 6698

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sys/kern/kern_rwlock.c

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