# HG changeset patch # User tschatzl # Date 1409055350 -7200 # Node ID fc0a95c692f511bba62b5c6e17fedbd9d48a06f8 # Parent 9eebe39ee539c7e6a694f006ba39cada1a2cc2de 8055919: Remove dead code in G1 concurrent marking code Reviewed-by: jmasa, jwilhelm diff -r 9eebe39ee539 -r fc0a95c692f5 hotspot/src/share/vm/gc_implementation/g1/concurrentMark.cpp --- a/hotspot/src/share/vm/gc_implementation/g1/concurrentMark.cpp Tue Aug 26 14:15:42 2014 +0200 +++ b/hotspot/src/share/vm/gc_implementation/g1/concurrentMark.cpp Tue Aug 26 14:15:50 2014 +0200 @@ -434,10 +434,6 @@ } } -bool ConcurrentMark::not_yet_marked(oop obj) const { - return _g1h->is_obj_ill(obj); -} - CMRootRegions::CMRootRegions() : _young_list(NULL), _cm(NULL), _scan_in_progress(false), _should_abort(false), _next_survivor(NULL) { } @@ -1117,20 +1113,17 @@ if (!_cm->has_aborted()) { do { double start_vtime_sec = os::elapsedVTime(); - double start_time_sec = os::elapsedTime(); double mark_step_duration_ms = G1ConcMarkStepDurationMillis; the_task->do_marking_step(mark_step_duration_ms, true /* do_termination */, false /* is_serial*/); - double end_time_sec = os::elapsedTime(); double end_vtime_sec = os::elapsedVTime(); double elapsed_vtime_sec = end_vtime_sec - start_vtime_sec; - double elapsed_time_sec = end_time_sec - start_time_sec; _cm->clear_has_overflown(); - bool ret = _cm->do_yield_check(worker_id); + _cm->do_yield_check(worker_id); jlong sleep_time_ms; if (!_cm->has_aborted() && the_task->has_aborted()) { @@ -1140,17 +1133,6 @@ os::sleep(Thread::current(), sleep_time_ms, false); SuspendibleThreadSet::join(); } - double end_time2_sec = os::elapsedTime(); - double elapsed_time2_sec = end_time2_sec - start_time_sec; - -#if 0 - gclog_or_tty->print_cr("CM: elapsed %1.4lf ms, sleep %1.4lf ms, " - "overhead %1.4lf", - elapsed_vtime_sec * 1000.0, (double) sleep_time_ms, - the_task->conc_overhead(os::elapsedTime()) * 8.0); - gclog_or_tty->print_cr("elapsed time %1.4lf ms, time 2: %1.4lf ms", - elapsed_time_sec * 1000.0, elapsed_time2_sec * 1000.0); -#endif } while (!_cm->has_aborted() && the_task->has_aborted()); } the_task->record_end_time(); @@ -2949,11 +2931,6 @@ _nextMarkBitMap->clearRange(mr); } -void ConcurrentMark::clearRangeBothBitmaps(MemRegion mr) { - clearRangePrevBitmap(mr); - clearRangeNextBitmap(mr); -} - HeapRegion* ConcurrentMark::claim_region(uint worker_id) { // "checkpoint" the finger @@ -3499,17 +3476,6 @@ } } -bool ConcurrentMark::containing_card_is_marked(void* p) { - size_t offset = pointer_delta(p, _g1h->reserved_region().start(), 1); - return _card_bm.at(offset >> CardTableModRefBS::card_shift); -} - -bool ConcurrentMark::containing_cards_are_marked(void* start, - void* last) { - return containing_card_is_marked(start) && - containing_card_is_marked(last); -} - #ifndef PRODUCT // for debugging purposes void ConcurrentMark::print_finger() { @@ -3762,7 +3728,7 @@ if (_cm->verbose_medium()) { gclog_or_tty->print_cr("[%u] regular clock, interval = %1.2lfms, " - "scanned = %d%s, refs reached = %d%s", + "scanned = "SIZE_FORMAT"%s, refs reached = "SIZE_FORMAT"%s", _worker_id, last_interval_ms, _words_scanned, (_words_scanned >= _words_scanned_limit) ? " (*)" : "", diff -r 9eebe39ee539 -r fc0a95c692f5 hotspot/src/share/vm/gc_implementation/g1/concurrentMark.hpp --- a/hotspot/src/share/vm/gc_implementation/g1/concurrentMark.hpp Tue Aug 26 14:15:42 2014 +0200 +++ b/hotspot/src/share/vm/gc_implementation/g1/concurrentMark.hpp Tue Aug 26 14:15:50 2014 +0200 @@ -683,7 +683,9 @@ return _task_queues->steal(worker_id, hash_seed, obj); } - ConcurrentMark(G1CollectedHeap* g1h, G1RegionToSpaceMapper* prev_bitmap_storage, G1RegionToSpaceMapper* next_bitmap_storage); + ConcurrentMark(G1CollectedHeap* g1h, + G1RegionToSpaceMapper* prev_bitmap_storage, + G1RegionToSpaceMapper* next_bitmap_storage); ~ConcurrentMark(); ConcurrentMarkThread* cmThread() { return _cmThread; } @@ -712,8 +714,10 @@ // inconsistent) and always passing the size. hr is the region that // contains the object and it's passed optionally from callers who // might already have it (no point in recalculating it). - inline void grayRoot(oop obj, size_t word_size, - uint worker_id, HeapRegion* hr = NULL); + inline void grayRoot(oop obj, + size_t word_size, + uint worker_id, + HeapRegion* hr = NULL); // It iterates over the heap and for each object it comes across it // will dump the contents of its reference fields, as well as @@ -734,7 +738,8 @@ // AND MARKED : indicates that an object is both explicitly and // implicitly live (it should be one or the other, not both) void print_reachable(const char* str, - VerifyOption vo, bool all) PRODUCT_RETURN; + VerifyOption vo, + bool all) PRODUCT_RETURN; // Clear the next marking bitmap (will be called concurrently). void clearNextBitmap(); @@ -771,12 +776,11 @@ // this carefully! inline void markPrev(oop p); - // Clears marks for all objects in the given range, for the prev, - // next, or both bitmaps. NB: the previous bitmap is usually + // Clears marks for all objects in the given range, for the prev or + // next bitmaps. NB: the previous bitmap is usually // read-only, so use this carefully! void clearRangePrevBitmap(MemRegion mr); void clearRangeNextBitmap(MemRegion mr); - void clearRangeBothBitmaps(MemRegion mr); // Notify data structures that a GC has started. void note_start_of_gc() { @@ -798,21 +802,6 @@ bool verify_thread_buffers, bool verify_fingers) PRODUCT_RETURN; - bool isMarked(oop p) const { - assert(p != NULL && p->is_oop(), "expected an oop"); - HeapWord* addr = (HeapWord*)p; - assert(addr >= _nextMarkBitMap->startWord() || - addr < _nextMarkBitMap->endWord(), "in a region"); - - return _nextMarkBitMap->isMarked(addr); - } - - inline bool not_yet_marked(oop p) const; - - // XXX Debug code - bool containing_card_is_marked(void* p); - bool containing_cards_are_marked(void* start, void* last); - bool isPrevMarked(oop p) const { assert(p != NULL && p->is_oop(), "expected an oop"); HeapWord* addr = (HeapWord*)p; @@ -898,7 +887,8 @@ // marked_bytes array slot for the given HeapRegion. // Sets the bits in the given card bitmap that are associated with the // cards that are spanned by the memory region. - inline void count_region(MemRegion mr, HeapRegion* hr, + inline void count_region(MemRegion mr, + HeapRegion* hr, size_t* marked_bytes_array, BitMap* task_card_bm); @@ -906,56 +896,27 @@ // data structures for the given worker id. inline void count_region(MemRegion mr, HeapRegion* hr, uint worker_id); - // Counts the given memory region in the task/worker counting - // data structures for the given worker id. - inline void count_region(MemRegion mr, uint worker_id); - // Counts the given object in the given task/worker counting // data structures. - inline void count_object(oop obj, HeapRegion* hr, + inline void count_object(oop obj, + HeapRegion* hr, size_t* marked_bytes_array, BitMap* task_card_bm); - // Counts the given object in the task/worker counting data - // structures for the given worker id. - inline void count_object(oop obj, HeapRegion* hr, uint worker_id); - // Attempts to mark the given object and, if successful, counts // the object in the given task/worker counting structures. - inline bool par_mark_and_count(oop obj, HeapRegion* hr, + inline bool par_mark_and_count(oop obj, + HeapRegion* hr, size_t* marked_bytes_array, BitMap* task_card_bm); // Attempts to mark the given object and, if successful, counts // the object in the task/worker counting structures for the // given worker id. - inline bool par_mark_and_count(oop obj, size_t word_size, - HeapRegion* hr, uint worker_id); - - // Attempts to mark the given object and, if successful, counts - // the object in the task/worker counting structures for the - // given worker id. - inline bool par_mark_and_count(oop obj, HeapRegion* hr, uint worker_id); - - // Similar to the above routine but we don't know the heap region that - // contains the object to be marked/counted, which this routine looks up. - inline bool par_mark_and_count(oop obj, uint worker_id); - - // Similar to the above routine but there are times when we cannot - // safely calculate the size of obj due to races and we, therefore, - // pass the size in as a parameter. It is the caller's responsibility - // to ensure that the size passed in for obj is valid. - inline bool par_mark_and_count(oop obj, size_t word_size, uint worker_id); - - // Unconditionally mark the given object, and unconditionally count - // the object in the counting structures for worker id 0. - // Should *not* be called from parallel code. - inline bool mark_and_count(oop obj, HeapRegion* hr); - - // Similar to the above routine but we don't know the heap region that - // contains the object to be marked/counted, which this routine looks up. - // Should *not* be called from parallel code. - inline bool mark_and_count(oop obj); + inline bool par_mark_and_count(oop obj, + size_t word_size, + HeapRegion* hr, + uint worker_id); // Returns true if initialization was successfully completed. bool completed_initialization() const { @@ -1227,9 +1188,12 @@ _finger = new_finger; } - CMTask(uint worker_id, ConcurrentMark *cm, - size_t* marked_bytes, BitMap* card_bm, - CMTaskQueue* task_queue, CMTaskQueueSet* task_queues); + CMTask(uint worker_id, + ConcurrentMark *cm, + size_t* marked_bytes, + BitMap* card_bm, + CMTaskQueue* task_queue, + CMTaskQueueSet* task_queues); // it prints statistics associated with this task void print_stats(); diff -r 9eebe39ee539 -r fc0a95c692f5 hotspot/src/share/vm/gc_implementation/g1/concurrentMark.inline.hpp --- a/hotspot/src/share/vm/gc_implementation/g1/concurrentMark.inline.hpp Tue Aug 26 14:15:42 2014 +0200 +++ b/hotspot/src/share/vm/gc_implementation/g1/concurrentMark.inline.hpp Tue Aug 26 14:15:50 2014 +0200 @@ -125,14 +125,6 @@ count_region(mr, hr, marked_bytes_array, task_card_bm); } -// Counts the given memory region, which may be a single object, in the -// task/worker counting data structures for the given worker id. -inline void ConcurrentMark::count_region(MemRegion mr, uint worker_id) { - HeapWord* addr = mr.start(); - HeapRegion* hr = _g1h->heap_region_containing_raw(addr); - count_region(mr, hr, worker_id); -} - // Counts the given object in the given task/worker counting data structures. inline void ConcurrentMark::count_object(oop obj, HeapRegion* hr, @@ -142,17 +134,6 @@ count_region(mr, hr, marked_bytes_array, task_card_bm); } -// Counts the given object in the task/worker counting data -// structures for the given worker id. -inline void ConcurrentMark::count_object(oop obj, - HeapRegion* hr, - uint worker_id) { - size_t* marked_bytes_array = count_marked_bytes_array_for(worker_id); - BitMap* task_card_bm = count_card_bitmap_for(worker_id); - HeapWord* addr = (HeapWord*) obj; - count_object(obj, hr, marked_bytes_array, task_card_bm); -} - // Attempts to mark the given object and, if successful, counts // the object in the given task/worker counting structures. inline bool ConcurrentMark::par_mark_and_count(oop obj, @@ -184,63 +165,6 @@ return false; } -// Attempts to mark the given object and, if successful, counts -// the object in the task/worker counting structures for the -// given worker id. -inline bool ConcurrentMark::par_mark_and_count(oop obj, - HeapRegion* hr, - uint worker_id) { - HeapWord* addr = (HeapWord*)obj; - if (_nextMarkBitMap->parMark(addr)) { - // Update the task specific count data for the object. - count_object(obj, hr, worker_id); - return true; - } - return false; -} - -// As above - but we don't know the heap region containing the -// object and so have to supply it. -inline bool ConcurrentMark::par_mark_and_count(oop obj, uint worker_id) { - HeapWord* addr = (HeapWord*)obj; - HeapRegion* hr = _g1h->heap_region_containing_raw(addr); - return par_mark_and_count(obj, hr, worker_id); -} - -// Similar to the above routine but we already know the size, in words, of -// the object that we wish to mark/count -inline bool ConcurrentMark::par_mark_and_count(oop obj, - size_t word_size, - uint worker_id) { - HeapWord* addr = (HeapWord*)obj; - if (_nextMarkBitMap->parMark(addr)) { - // Update the task specific count data for the object. - MemRegion mr(addr, word_size); - count_region(mr, worker_id); - return true; - } - return false; -} - -// Unconditionally mark the given object, and unconditionally count -// the object in the counting structures for worker id 0. -// Should *not* be called from parallel code. -inline bool ConcurrentMark::mark_and_count(oop obj, HeapRegion* hr) { - HeapWord* addr = (HeapWord*)obj; - _nextMarkBitMap->mark(addr); - // Update the task specific count data for the object. - count_object(obj, hr, 0 /* worker_id */); - return true; -} - -// As above - but we don't have the heap region containing the -// object, so we have to supply it. -inline bool ConcurrentMark::mark_and_count(oop obj) { - HeapWord* addr = (HeapWord*)obj; - HeapRegion* hr = _g1h->heap_region_containing_raw(addr); - return mark_and_count(obj, hr); -} - inline bool CMBitMapRO::iterate(BitMapClosure* cl, MemRegion mr) { HeapWord* start_addr = MAX2(startWord(), mr.start()); HeapWord* end_addr = MIN2(endWord(), mr.end());