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src/hotspot/share/gc/shared/threadLocalAllocBuffer.cpp
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rev 49521 : [mq]: heap8
rev 49522 : [mq]: event_rebased
@@ -44,10 +44,18 @@
void ThreadLocalAllocBuffer::clear_before_allocation() {
_slow_refill_waste += (unsigned)remaining();
make_parsable(true); // also retire the TLAB
}
+size_t ThreadLocalAllocBuffer::remaining() {
+ if (current_end() == NULL) {
+ return 0;
+ }
+
+ return pointer_delta(reserved_end(), top());
+}
+
void ThreadLocalAllocBuffer::accumulate_statistics_before_gc() {
global_stats()->initialize();
for (JavaThreadIteratorWithHandle jtiwh; JavaThread *thread = jtiwh.next(); ) {
thread->tlab().accumulate_statistics();
@@ -106,28 +114,30 @@
// Fills the current tlab with a dummy filler array to create
// an illusion of a contiguous Eden and optionally retires the tlab.
// Waste accounting should be done in caller as appropriate; see,
// for example, clear_before_allocation().
void ThreadLocalAllocBuffer::make_parsable(bool retire, bool zap) {
- if (end() != NULL) {
+ if (current_end() != NULL) {
invariants();
if (retire) {
myThread()->incr_allocated_bytes(used_bytes());
}
- CollectedHeap::fill_with_object(top(), hard_end(), retire && zap);
+ CollectedHeap::fill_with_object(top(), reserved_end(), retire && zap);
if (retire || ZeroTLAB) { // "Reset" the TLAB
set_start(NULL);
set_top(NULL);
set_pf_top(NULL);
- set_end(NULL);
+ set_current_end(NULL);
+ set_allocation_end(NULL);
}
}
assert(!(retire || ZeroTLAB) ||
- (start() == NULL && end() == NULL && top() == NULL),
+ (start() == NULL && current_end() == NULL && top() == NULL &&
+ _allocation_end == NULL),
"TLAB must be reset");
}
void ThreadLocalAllocBuffer::resize_all_tlabs() {
if (ResizeTLAB) {
@@ -169,23 +179,29 @@
HeapWord* top,
size_t new_size) {
_number_of_refills++;
print_stats("fill");
assert(top <= start + new_size - alignment_reserve(), "size too small");
+
initialize(start, top, start + new_size - alignment_reserve());
+ if (ThreadHeapSampler::enabled()) {
+ set_sample_end();
+ }
+
// Reset amount of internal fragmentation
set_refill_waste_limit(initial_refill_waste_limit());
}
void ThreadLocalAllocBuffer::initialize(HeapWord* start,
HeapWord* top,
HeapWord* end) {
set_start(start);
set_top(top);
set_pf_top(top);
- set_end(end);
+ set_current_end(end);
+ set_allocation_end(end);
invariants();
}
void ThreadLocalAllocBuffer::initialize() {
initialize(NULL, // start
@@ -304,16 +320,50 @@
p += oop(p)->size();
}
guarantee(p == top(), "end of last object must match end of space");
}
+void ThreadLocalAllocBuffer::set_sample_end() {
+ size_t heap_words_remaining = pointer_delta(_current_end, _top);
+ size_t bytes_until_sample = myThread()->heap_sampler().bytes_until_sample();
+ size_t words_until_sample = bytes_until_sample / HeapWordSize;;
+
+ if (heap_words_remaining > words_until_sample) {
+ HeapWord* new_end = _top + words_until_sample;
+ set_current_end(new_end);
+ _bytes_since_last_sample_point = bytes_until_sample;
+ } else {
+ _bytes_since_last_sample_point = heap_words_remaining * HeapWordSize;;
+ }
+}
+
Thread* ThreadLocalAllocBuffer::myThread() {
return (Thread*)(((char *)this) +
in_bytes(start_offset()) -
in_bytes(Thread::tlab_start_offset()));
}
+void ThreadLocalAllocBuffer::set_back_allocation_end() {
+ _current_end = _allocation_end;
+}
+
+HeapWord* ThreadLocalAllocBuffer::allocate_sampled_object(size_t size) {
+ Thread* thread = myThread();
+ thread->tlab().set_back_allocation_end();
+ HeapWord* result = thread->tlab().allocate(size);
+
+ if (result) {
+ thread->heap_sampler().check_for_sampling(result, size * HeapWordSize, _bytes_since_last_sample_point);
+ thread->tlab().set_sample_end();
+ }
+
+ return result;
+}
+
+HeapWord* ThreadLocalAllocBuffer::reserved_end() {
+ return _allocation_end + alignment_reserve();
+}
GlobalTLABStats::GlobalTLABStats() :
_allocating_threads_avg(TLABAllocationWeight) {
initialize();
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