src/hotspot/share/gc/g1/g1SharedClosures.hpp
author tschatzl
Thu, 24 Oct 2019 11:08:16 +0200
changeset 58777 18c246ad2ff9
parent 58263 4fbc534fdf69
permissions -rw-r--r--
8230706: Waiting on completion of strong nmethod processing causes long pause times with G1 Summary: Instead of globally waiting for completion of strong nmethod processing during evacuation, synchronize the nmethods processing on a per-nmethod basis so that only one thread processes one nmethod at once using a state. This state indicates what work (strong/weak processing) needs to be done and what has already been done. Reviewed-by: sjohanss, kbarrett

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#include "gc/g1/g1CodeBlobClosure.hpp"
#include "gc/g1/g1OopClosures.hpp"
#include "memory/iterator.hpp"

class G1CollectedHeap;
class G1ParScanThreadState;

// Simple holder object for a complete set of closures used by the G1 evacuation code.
template <G1Mark Mark>
class G1SharedClosures {
  static bool needs_strong_processing() {
    // Request strong code root processing when G1MarkFromRoot is passed in during
    // initial mark.
    return Mark == G1MarkFromRoot;
  }
public:
  G1ParCopyClosure<G1BarrierNone, Mark> _oops;
  G1ParCopyClosure<G1BarrierCLD,  Mark> _oops_in_cld;

  G1CLDScanClosure                _clds;
  G1CodeBlobClosure               _codeblobs;

  G1SharedClosures(G1CollectedHeap* g1h, G1ParScanThreadState* pss, bool process_only_dirty) :
    _oops(g1h, pss),
    _oops_in_cld(g1h, pss),
    _clds(&_oops_in_cld, process_only_dirty),
    _codeblobs(pss->worker_id(), &_oops, needs_strong_processing()) {}
};