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src/share/vm/gc/shared/threadLocalAllocBuffer.hpp
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@@ -42,18 +42,22 @@
friend class JVMCIVMStructs;
private:
HeapWord* _start; // address of TLAB
HeapWord* _top; // address after last allocation
HeapWord* _pf_top; // allocation prefetch watermark
- HeapWord* _end; // allocation end (excluding alignment_reserve)
+ HeapWord* _end; // allocation end (can be the sampling end point or
+ // the actual TLAB end, excluding alignment_reserve)
+ HeapWord* _actual_end; // allocation actual_end (actual TLAB end, excluding alignment_reserve)
size_t _desired_size; // desired size (including alignment_reserve)
size_t _refill_waste_limit; // hold onto tlab if free() is larger than this
size_t _allocated_before_last_gc; // total bytes allocated up until the last gc
static size_t _max_size; // maximum size of any TLAB
static int _reserve_for_allocation_prefetch; // Reserve at the end of the TLAB
static unsigned _target_refills; // expected number of refills between GCs
+ size_t _bytes_until_sample; // bytes until sample.
+ size_t _extra_space; // extra space due to sampling logic.
unsigned _number_of_refills;
unsigned _fast_refill_waste;
unsigned _slow_refill_waste;
unsigned _gc_waste;
@@ -64,14 +68,16 @@
void accumulate_statistics();
void initialize_statistics();
void set_start(HeapWord* start) { _start = start; }
void set_end(HeapWord* end) { _end = end; }
+ void set_actual_end(HeapWord* actual_end) { _actual_end = actual_end; }
void set_top(HeapWord* top) { _top = top; }
void set_pf_top(HeapWord* pf_top) { _pf_top = pf_top; }
void set_desired_size(size_t desired_size) { _desired_size = desired_size; }
void set_refill_waste_limit(size_t waste) { _refill_waste_limit = waste; }
+ void set_bytes_until_sample(size_t bytes) { _bytes_until_sample = bytes; }
size_t initial_refill_waste_limit() { return desired_size() / TLABRefillWasteFraction; }
static int target_refills() { return _target_refills; }
size_t initial_desired_size();
@@ -113,11 +119,11 @@
static size_t max_size_in_bytes() { return max_size() * BytesPerWord; }
static void set_max_size(size_t max_size) { _max_size = max_size; }
HeapWord* start() const { return _start; }
HeapWord* end() const { return _end; }
- HeapWord* hard_end() const { return _end + alignment_reserve(); }
+ HeapWord* hard_end() const { return _actual_end + alignment_reserve(); }
HeapWord* top() const { return _top; }
HeapWord* pf_top() const { return _pf_top; }
size_t desired_size() const { return _desired_size; }
size_t used() const { return pointer_delta(top(), start()); }
size_t used_bytes() const { return pointer_delta(top(), start(), 1); }
@@ -157,18 +163,26 @@
static void accumulate_statistics_before_gc();
// Resize tlabs for all threads
static void resize_all_tlabs();
+ void set_back_actual_end() { _end = _actual_end; }
void fill(HeapWord* start, HeapWord* top, size_t new_size);
void initialize();
+ void pick_next_sample();
+ void handle_sample(Thread* thread, HeapWord* result, size_t size);
+ size_t bytes_until_sample() { return _bytes_until_sample; }
+ size_t *bytes_until_sample_addr() { return &_bytes_until_sample; }
+ bool should_sample() { return bytes_until_sample() == 0; }
+
static size_t refill_waste_limit_increment() { return TLABWasteIncrement; }
// Code generation support
static ByteSize start_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _start); }
static ByteSize end_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _end ); }
+ static ByteSize actual_end_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _actual_end ); }
static ByteSize top_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _top ); }
static ByteSize pf_top_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _pf_top ); }
static ByteSize size_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _desired_size ); }
static ByteSize refill_waste_limit_offset() { return byte_offset_of(ThreadLocalAllocBuffer, _refill_waste_limit ); }
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