JDK-8184751 : Provide thread pool for parallel safepoint cleanup
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 10
  • Priority: P4
  • Status: Resolved
  • Resolution: Withdrawn
  • OS: generic
  • CPU: generic
  • Submitted: 2017-07-17
  • Updated: 2020-01-22
  • Resolved: 2018-07-11
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tbd_majorResolved
Related Reports
Blocks :  
JDK-8132849 - Increased stop time in cleanup phase because of single-threaded walk of thread stacks in NMethodSweeper::mark_active_nmethods()
Relates :  
JDK-8132849 - Increased stop time in cleanup phase because of single-threaded walk of thread stacks in NMethodSweeper::mark_active_nmethods()
Relates :  
JDK-8153224 - Monitor deflation prolong safepoints
Relates :  
JDK-8180932 - Parallelize safepoint cleanup
Relates :  
JDK-8237640 - Implement CollectedHeap::get_safepoint_workers() for parallel gc
Relates :  
JDK-8202829 - Implement CollectedHeap::get_safepoint_workers() for G1
Description
This is a followup to JDK-8180932, where we introduced skeleton code for parallel safepoint cleanup. Now, the GC side should have a way to provide a thread pool to the safepointing code in order to actually parallelize safepoint cleanup.
Comments
Shouldn't ParallelGC offer a worker gang too?
21-01-2020
Since filing this issue, both ZGC and G1 have implemented safepoint worker pools. When Shenandoah arrives, it will come with a worker pool as well. I withdraw this issue.
11-07-2018
I recommend closing as "Not an issue" or "Withdrawn".
11-07-2018
Only bugs with changesets associated with them should be closed as "fixed". Reopening this bug.
11-07-2018
G1, ZGC and Shenandoah all provide safepoint workers at this point.
06-07-2018
It seems like G1 and ZGC already provide thread pool, and Shenandoah does it too. Closing this issue.
06-07-2018