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src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp
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rev 55336 : 8225550: Shenandoah: Prevent SH::object_iterate() call's side-effects
rev 55337 : 8225573: Shenandoah: Enhance ShenandoahVerifier to ensure roots to-space invariant
rev 55339 : 8225582: Shenandoah: Enable concurrent evacuation of JNIHandles and CLDG roots
@@ -36,10 +36,11 @@
#include "gc/shenandoah/shenandoahBarrierSet.hpp"
#include "gc/shenandoah/shenandoahClosures.inline.hpp"
#include "gc/shenandoah/shenandoahCollectionSet.hpp"
#include "gc/shenandoah/shenandoahCollectorPolicy.hpp"
#include "gc/shenandoah/shenandoahConcurrentMark.inline.hpp"
+#include "gc/shenandoah/shenandoahConcurrentRoots.hpp"
#include "gc/shenandoah/shenandoahControlThread.hpp"
#include "gc/shenandoah/shenandoahFreeSet.hpp"
#include "gc/shenandoah/shenandoahPhaseTimings.hpp"
#include "gc/shenandoah/shenandoahHeap.inline.hpp"
#include "gc/shenandoah/shenandoahHeapRegion.hpp"
@@ -947,11 +948,11 @@
{}
void work(uint worker_id) {
if (_concurrent) {
ShenandoahConcurrentWorkerSession worker_session(worker_id);
- ShenandoahSuspendibleThreadSetJoiner stsj(ShenandoahSuspendibleWorkers);
+ ShenandoahSuspendibleThreadSetJoiner stsj;
ShenandoahEvacOOMScope oom_evac_scope;
do_work();
} else {
ShenandoahParallelWorkerSession worker_session(worker_id);
ShenandoahEvacOOMScope oom_evac_scope;
@@ -1069,13 +1070,15 @@
void ShenandoahHeap::evacuate_and_update_roots() {
#if COMPILER2_OR_JVMCI
DerivedPointerTable::clear();
#endif
assert(ShenandoahSafepoint::is_at_shenandoah_safepoint(), "Only iterate roots while world is stopped");
-
{
- ShenandoahRootEvacuator rp(workers()->active_workers(), ShenandoahPhaseTimings::init_evac);
+ // Include concurrent roots if current cycle can not process those roots concurrently
+ bool include_concurrent_roots = !ShenandoahConcurrentRoots::should_do_concurrent_roots();
+
+ ShenandoahRootEvacuator rp(workers()->active_workers(), ShenandoahPhaseTimings::init_evac, include_concurrent_roots);
ShenandoahEvacuateUpdateRootsTask roots_task(&rp);
workers()->run_task(&roots_task);
}
#if COMPILER2_OR_JVMCI
@@ -1515,11 +1518,16 @@
if (ShenandoahPacing) {
pacer()->setup_for_evac();
}
if (ShenandoahVerify) {
+ if (ShenandoahConcurrentRoots::should_do_concurrent_roots()) {
+ ShenandoahRootVerifier::RootTypes types = ShenandoahRootVerifier::combine(ShenandoahRootVerifier::JNIHandleRoots, ShenandoahRootVerifier::CLDGRoots);
+ verifier()->verify_roots_no_forwarded_except(types);
+ } else {
verifier()->verify_roots_no_forwarded();
+ }
verifier()->verify_during_evacuation();
}
} else {
if (ShenandoahVerify) {
verifier()->verify_after_concmark();
@@ -1576,10 +1584,38 @@
void ShenandoahHeap::op_cleanup() {
free_set()->recycle_trash();
}
+class ShenandoahConcurrentRootsEvacUpdateTask : public AbstractGangTask {
+private:
+ SuspendibleThreadSetJoiner _sts_joiner;
+ ShenandoahJNIHandleRoots<true /*concurrent*/> _jni_roots;
+ ShenandoahClassLoaderDataRoots<true /* concurrent */> _cld_roots;
+public:
+ ShenandoahConcurrentRootsEvacUpdateTask() :
+ AbstractGangTask("Shenandoah Evacuate/Update Concurrent Roots Task") {
+ }
+
+ void work(uint worker_id) {
+ ShenandoahEvacOOMScope oom;
+ ShenandoahEvacuateUpdateRootsClosure cl;
+ CLDToOopClosure clds(&cl, ClassLoaderData::_claim_strong);
+
+ _jni_roots.oops_do<ShenandoahEvacuateUpdateRootsClosure>(&cl);
+ _cld_roots.cld_do(&clds);
+ }
+};
+
+void ShenandoahHeap::op_concurrent_roots() {
+ if (is_evacuation_in_progress() &&
+ ShenandoahConcurrentRoots::should_do_concurrent_roots()) {
+ ShenandoahConcurrentRootsEvacUpdateTask task;
+ workers()->run_task(&task);
+ }
+}
+
void ShenandoahHeap::op_reset() {
reset_mark_bitmap();
}
void ShenandoahHeap::op_preclean() {
@@ -1849,11 +1885,10 @@
bool ShenandoahHeap::try_cancel_gc() {
while (true) {
jbyte prev = _cancelled_gc.cmpxchg(CANCELLED, CANCELLABLE);
if (prev == CANCELLABLE) return true;
else if (prev == CANCELLED) return false;
- assert(ShenandoahSuspendibleWorkers, "should not get here when not using suspendible workers");
assert(prev == NOT_CANCELLED, "must be NOT_CANCELLED");
{
// We need to provide a safepoint here, otherwise we might
// spin forever if a SP is pending.
ThreadBlockInVM sp(JavaThread::current());
@@ -2063,11 +2098,11 @@
}
void work(uint worker_id) {
if (_concurrent) {
ShenandoahConcurrentWorkerSession worker_session(worker_id);
- ShenandoahSuspendibleThreadSetJoiner stsj(ShenandoahSuspendibleWorkers);
+ ShenandoahSuspendibleThreadSetJoiner stsj;
do_work();
} else {
ShenandoahParallelWorkerSession worker_session(worker_id);
do_work();
}
@@ -2263,19 +2298,15 @@
}
return true;
}
void ShenandoahHeap::safepoint_synchronize_begin() {
- if (ShenandoahSuspendibleWorkers || UseStringDeduplication) {
SuspendibleThreadSet::synchronize();
- }
}
void ShenandoahHeap::safepoint_synchronize_end() {
- if (ShenandoahSuspendibleWorkers || UseStringDeduplication) {
SuspendibleThreadSet::desynchronize();
- }
}
void ShenandoahHeap::vmop_entry_init_mark() {
TraceCollectorStats tcs(monitoring_support()->stw_collection_counters());
ShenandoahGCPhase total(ShenandoahPhaseTimings::total_pause_gross);
@@ -2536,10 +2567,26 @@
"concurrent reference update");
try_inject_alloc_failure();
op_updaterefs();
}
+
+void ShenandoahHeap::entry_concurrent_roots() {
+ ShenandoahGCPhase phase(ShenandoahPhaseTimings::conc_roots);
+
+ static const char* msg = "Concurrent roots processing";
+ GCTraceTime(Info, gc) time(msg, NULL, GCCause::_no_gc, true);
+ EventMark em("%s", msg);
+
+ ShenandoahWorkerScope scope(workers(),
+ ShenandoahWorkerPolicy::calc_workers_for_conc_root_processing(),
+ "concurrent root processing");
+
+ try_inject_alloc_failure();
+ op_concurrent_roots();
+}
+
void ShenandoahHeap::entry_cleanup() {
ShenandoahGCPhase phase(ShenandoahPhaseTimings::conc_cleanup);
static const char* msg = "Concurrent cleanup";
GCTraceTime(Info, gc) time(msg, NULL, GCCause::_no_gc, true);
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