Ondřej Surý aec1578620
Reduce rwlock contention in isc_log_wouldlog() ...
The rwlock introduced to protect the .logconfig member of isc_log_t
structure caused a significant performance drop because of the rwlock
contention. It was also found, that the debug_level member of said
structure was not protected from concurrent read/writes.
The .dynamic and .highest_level members of isc_logconfig_t structure
were actually just cached values pulled from the assigned channels.
We introduced an even higher cache level for .dynamic and .highest_level
members directly into the isc_log_t structure, so we don't have to
access the .logconfig member in the isc_log_wouldlog() function.
(cherry picked from commit 3a24eacbb6
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aec1578620