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8271215: Fix data races in G1PeriodicGCTask #4899

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@@ -27,12 +27,16 @@
#include "gc/g1/g1ConcurrentMark.inline.hpp"
#include "gc/g1/g1ConcurrentMarkThread.inline.hpp"
#include "gc/g1/g1PeriodicGCTask.hpp"
#include "gc/shared/suspendibleThreadSet.hpp"
#include "logging/log.hpp"
#include "runtime/globals.hpp"
#include "runtime/os.hpp"
#include "utilities/globalDefinitions.hpp"

bool G1PeriodicGCTask::should_start_periodic_gc() {
// Ensure no GC safepoints while we're doing the checks, to avoid data races.
SuspendibleThreadSetJoiner sts;

G1CollectedHeap* g1h = G1CollectedHeap::heap();
// If we are currently in a concurrent mark we are going to uncommit memory soon.
if (g1h->concurrent_mark()->cm_thread()->in_progress()) {