RFR(XS): 8252303 : G1MMUTrackerQueue::when_sec skip queue iteration on max_gc_time pause time

[Ivan Walulya]

Hi All,

Please review this enhancement in G1MMUTrackerQueue to skip unnecessary buffer iterations.

JBS: https://bugs.openjdk.java.net/browse/JDK-8252303
Webrev: http://cr.openjdk.java.net/~iwalulya/8252303/00/
Testing: Tier 1 - 3


//Ivan