JDK-8208499 : NMT: Missing memory tag for Safepoint polling page
  • Type: Bug
  • Component: hotspot
  • Sub-Component: runtime
  • Affected Version: 8,11,12
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2018-07-30
  • Updated: 2019-10-04
  • Resolved: 2018-07-31
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JDK 11 JDK 12
11.0.5Fixed 12 b05Fixed
Related Reports
Relates :  
JDK-8199746 - NMT: Breakup overused mtInternal into more fine grained categories.
Relates :  
JDK-8210314 - [aix] NMT does not show "Safepoint" memory type
Relates :  
JDK-8209939 - [testbug][ppc] Test SafepointPollingPages fails after 8208499 with UseSIGTRAP on.
Description
Missing NMT memory tag for global Safepoint polling page
Comments
Fix Request (11u) I would like to backport this patch to 11u. This patch eliminates an "unknown" virtual memory allocation in NMT (summary and details), due to missing memory tag, that results more precise and complete NMT statistics and output. The patch does not apply cleanly, due to line shifts in MemTracker::init_tracking_level(), introduced by JDK-8207139. The patch passed hotspot_nmt and manual tests.
31-07-2019