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8246097: Shenandoah: limit parallelism in CLDG root handling

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Reviewed-by: zgu
This commit is contained in:
Aleksey Shipilev 2020-06-02 14:27:18 +02:00
parent 82dc495ca0
commit ed538ea5e0
5 changed files with 65 additions and 17 deletions
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9
src/hotspot/share/gc/shenandoah/shenandoahRootProcessor.inline.hpp
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@ -122,7 +122,8 @@ void ShenandoahVMRoots<CONCURRENT>::oops_do(T* cl, uint worker_id) {
}
template <bool CONCURRENT, bool SINGLE_THREADED>
ShenandoahClassLoaderDataRoots<CONCURRENT, SINGLE_THREADED>::ShenandoahClassLoaderDataRoots(ShenandoahPhaseTimings::Phase phase) :
ShenandoahClassLoaderDataRoots<CONCURRENT, SINGLE_THREADED>::ShenandoahClassLoaderDataRoots(ShenandoahPhaseTimings::Phase phase, uint n_workers) :
_semaphore(worker_count(n_workers)),
_phase(phase) {
if (!SINGLE_THREADED) {
ClassLoaderDataGraph::clear_claimed_marks();
@ -146,9 +147,10 @@ void ShenandoahClassLoaderDataRoots<CONCURRENT, SINGLE_THREADED>::always_strong_
assert(SafepointSynchronize::is_at_safepoint(), "Must be at a safepoint");
assert(Thread::current()->is_VM_thread(), "Single threaded CLDG iteration can only be done by VM thread");
ClassLoaderDataGraph::always_strong_cld_do(clds);
} else {
} else if (_semaphore.try_acquire()) {
ShenandoahWorkerTimingsTracker timer(_phase, ShenandoahPhaseTimings::CLDGRoots, worker_id);
ClassLoaderDataGraph::always_strong_cld_do(clds);
_semaphore.claim_all();
}
}
@ -158,9 +160,10 @@ void ShenandoahClassLoaderDataRoots<CONCURRENT, SINGLE_THREADED>::cld_do(CLDClos
assert(SafepointSynchronize::is_at_safepoint(), "Must be at a safepoint");
assert(Thread::current()->is_VM_thread(), "Single threaded CLDG iteration can only be done by VM thread");
ClassLoaderDataGraph::cld_do(clds);
} else {
} else if (_semaphore.try_acquire()) {
ShenandoahWorkerTimingsTracker timer(_phase, ShenandoahPhaseTimings::CLDGRoots, worker_id);
ClassLoaderDataGraph::cld_do(clds);
_semaphore.claim_all();
}
}