RFR: Take boost mode into account when calculating duration of gc

Per Liden per.liden at oracle.com
Mon Mar 5 14:24:45 UTC 2018

When using boost mode (i.e. when we're using all available worker 
threads instead of ConcGCThreads) we typically complete a GC cycle much 
faster than normal (as intended). However, this causes the "duration of 
gc" calculations to be artificially deflated, can later lead to a 
situation where we risk starting a GC cycle too late. This patch 
corrects the "duration of gc" calculation by taking the "boost factor" 
into account.



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