8040162: Avoid reallocating PLABs between GC phases in G1
Summary: Allocate G1ParScanThreadState at the start of GC and only deallocate at the end of GC. This automatically keeps the current PLAB intact without flushing it (and loosing lots of memory) for every reallocation.
Reviewed-by: david, mgerdin
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#include "precompiled.hpp"
#include "gc/g1/g1CollectedHeap.hpp"
#include "gc/g1/g1ParScanThreadState.hpp"
#include "gc/g1/heapRegion.inline.hpp"
bool G1CollectedHeap::copy_allocation_context_stats(const jint* contexts,
jlong* totals,
jbyte* accuracy,
jint len) {
return false;
}
HeapRegion* G1CollectedHeap::new_heap_region(uint hrs_index,
MemRegion mr) {
return new HeapRegion(hrs_index, bot_shared(), mr);
}
G1ParScanThreadState* G1CollectedHeap::new_par_scan_state(uint worker_id) {
return new G1ParScanThreadState(this, worker_id);
}