RFR: 8246045: ZGC: Fix ZDirector::rule_high_usage() calculation

Per Liden per.liden at oracle.com
Thu May 28 08:21:05 UTC 2020

When ZDirector::rule_high_usage() calculates the amount of free space, 
it should take into account that "used" could be higher than 
"soft_max_capacity". Just like we do inZDirector::rule_allocation_rate().

Bug: https://bugs.openjdk.java.net/browse/JDK-8246045
Webrev: http://cr.openjdk.java.net/~pliden/8246045/webrev.0


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