RFR: NMT: Don't record uncommits unconditionally

Stefan Karlsson stefan.karlsson at oracle.com
Wed Jan 10 16:01:36 UTC 2018

Hi all,

Please review this patch to fix a bug in the recent NMT implementation 
for ZGC.


The uncommit path was executed even when NMT was turned off. Because of 
this we hit the following assertion when pages were detached:

#  Internal Error (.../services/memTracker.hpp:231), pid=12751, tid=2738
#  assert(tracking_level() >= NMT_summary) failed: Check by caller


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