242 gclog_or_tty->print_cr("[%u] task queue overflow, "
243 "moving entries to the global stack",
244 _worker_id);
245 }
246 move_entries_to_global_stack();
247
248 // this should succeed since, even if we overflow the global
249 // stack, we should have definitely removed some entries from the
250 // local queue. So, there must be space on it.
251 bool success = _task_queue->push(obj);
252 assert(success, "invariant");
253 }
254
255 statsOnly( size_t tmp_size = (size_t)_task_queue->size();
256 if (tmp_size > _local_max_size) {
257 _local_max_size = tmp_size;
258 }
259 ++_local_pushes );
260 }
261
262 // This determines whether the method below will check both the local
263 // and global fingers when determining whether to push on the stack a
264 // gray object (value 1) or whether it will only check the global one
265 // (value 0). The tradeoffs are that the former will be a bit more
266 // accurate and possibly push less on the stack, but it might also be
267 // a little bit slower.
268
269 #define _CHECK_BOTH_FINGERS_ 1
270
271 inline void CMTask::deal_with_reference(oop obj) {
272 if (_cm->verbose_high()) {
273 gclog_or_tty->print_cr("[%u] we're dealing with reference = "PTR_FORMAT,
274 _worker_id, p2i((void*) obj));
275 }
276
277 ++_refs_reached;
278
279 HeapWord* objAddr = (HeapWord*) obj;
280 assert(obj->is_oop_or_null(true /* ignore mark word */), err_msg("Expected an oop or NULL at " PTR_FORMAT, p2i(obj)));
281 if (_g1h->is_in_g1_reserved(objAddr)) {
282 assert(obj != NULL, "null check is implicit");
283 if (!_nextMarkBitMap->isMarked(objAddr)) {
284 // Only get the containing region if the object is not marked on the
285 // bitmap (otherwise, it's a waste of time since we won't do
286 // anything with it).
287 HeapRegion* hr = _g1h->heap_region_containing_raw(obj);
288 if (!hr->obj_allocated_since_next_marking(obj)) {
289 if (_cm->verbose_high()) {
290 gclog_or_tty->print_cr("[%u] "PTR_FORMAT" is not considered marked",
291 _worker_id, p2i((void*) obj));
292 }
293
294 // we need to mark it first
295 if (_cm->par_mark_and_count(obj, hr, _marked_bytes_array, _card_bm)) {
296 // No OrderAccess:store_load() is needed. It is implicit in the
297 // CAS done in CMBitMap::parMark() call in the routine above.
298 HeapWord* global_finger = _cm->finger();
299
300 #if _CHECK_BOTH_FINGERS_
301 // we will check both the local and global fingers
302
303 if (_finger != NULL && objAddr < _finger) {
304 if (_cm->verbose_high()) {
305 gclog_or_tty->print_cr("[%u] below the local finger ("PTR_FORMAT"), "
306 "pushing it", _worker_id, p2i(_finger));
307 }
308 push(obj);
309 } else if (_curr_region != NULL && objAddr < _region_limit) {
310 // do nothing
311 } else if (objAddr < global_finger) {
312 // Notice that the global finger might be moving forward
313 // concurrently. This is not a problem. In the worst case, we
314 // mark the object while it is above the global finger and, by
315 // the time we read the global finger, it has moved forward
316 // passed this object. In this case, the object will probably
317 // be visited when a task is scanning the region and will also
318 // be pushed on the stack. So, some duplicate work, but no
319 // correctness problems.
320
321 if (_cm->verbose_high()) {
322 gclog_or_tty->print_cr("[%u] below the global finger "
323 "("PTR_FORMAT"), pushing it",
324 _worker_id, p2i(global_finger));
325 }
326 push(obj);
327 } else {
328 // do nothing
329 }
330 #else // _CHECK_BOTH_FINGERS_
331 // we will only check the global finger
332
333 if (objAddr < global_finger) {
334 // see long comment above
335
336 if (_cm->verbose_high()) {
337 gclog_or_tty->print_cr("[%u] below the global finger "
338 "("PTR_FORMAT"), pushing it",
339 _worker_id, p2i(global_finger));
340 }
341 push(obj);
342 }
343 #endif // _CHECK_BOTH_FINGERS_
344 }
345 }
346 }
347 }
348 }
349
350 inline void ConcurrentMark::markPrev(oop p) {
351 assert(!_prevMarkBitMap->isMarked((HeapWord*) p), "sanity");
352 // Note we are overriding the read-only view of the prev map here, via
353 // the cast.
354 ((CMBitMap*)_prevMarkBitMap)->mark((HeapWord*) p);
355 }
356
357 inline void ConcurrentMark::grayRoot(oop obj, size_t word_size,
358 uint worker_id, HeapRegion* hr) {
359 assert(obj != NULL, "pre-condition");
360 HeapWord* addr = (HeapWord*) obj;
361 if (hr == NULL) {
362 hr = _g1h->heap_region_containing_raw(addr);
363 } else {
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242 gclog_or_tty->print_cr("[%u] task queue overflow, "
243 "moving entries to the global stack",
244 _worker_id);
245 }
246 move_entries_to_global_stack();
247
248 // this should succeed since, even if we overflow the global
249 // stack, we should have definitely removed some entries from the
250 // local queue. So, there must be space on it.
251 bool success = _task_queue->push(obj);
252 assert(success, "invariant");
253 }
254
255 statsOnly( size_t tmp_size = (size_t)_task_queue->size();
256 if (tmp_size > _local_max_size) {
257 _local_max_size = tmp_size;
258 }
259 ++_local_pushes );
260 }
261
262 inline void CMTask::deal_with_reference_below_finger(
263 oop obj, HeapWord* finger, bool is_global_finger)
264 {
265 if (_cm->verbose_high()) {
266 gclog_or_tty->print_cr(
267 "[%u] below the %s finger (" PTR_FORMAT ") pushing " PTR_FORMAT,
268 _worker_id, (is_global_finger ? "global" : "local"),
269 p2i(finger), p2i((void*)obj));
270 }
271 push(obj);
272 }
273
274 inline void CMTask::deal_with_reference(oop obj) {
275 if (_cm->verbose_high()) {
276 gclog_or_tty->print_cr("[%u] we're dealing with reference = "PTR_FORMAT,
277 _worker_id, p2i((void*) obj));
278 }
279
280 ++_refs_reached;
281
282 HeapWord* objAddr = (HeapWord*) obj;
283 assert(obj->is_oop_or_null(true /* ignore mark word */), err_msg("Expected an oop or NULL at " PTR_FORMAT, p2i(obj)));
284 if (_g1h->is_in_g1_reserved(objAddr)) {
285 assert(obj != NULL, "null check is implicit");
286 if (!_nextMarkBitMap->isMarked(objAddr)) {
287 // Only get the containing region if the object is not marked on the
288 // bitmap (otherwise, it's a waste of time since we won't do
289 // anything with it).
290 HeapRegion* hr = _g1h->heap_region_containing_raw(obj);
291 if (!hr->obj_allocated_since_next_marking(obj)) {
292 if (_cm->verbose_high()) {
293 gclog_or_tty->print_cr("[%u] "PTR_FORMAT" is not considered marked",
294 _worker_id, p2i((void*) obj));
295 }
296
297 // we need to mark it first
298 if (_cm->par_mark_and_count(obj, hr, _marked_bytes_array, _card_bm)) {
299 // No OrderAccess:store_load() is needed. It is implicit in the
300 // CAS done in CMBitMap::parMark() call in the routine above.
301 HeapWord* global_finger = _cm->finger();
302
303 // If we have a current region, check against it first to
304 // decide whether to push a freshly grey object on the mark
305 // stack or leave it to the mark bit processor. The
306 // tradeoff vs only checking the global finger is that the
307 // local check will be a bit more accurate and possibly push
308 // less on the stack, but might also be a little bit slower.
309 if (_finger != NULL) {
310 // We have a current region.
311 assert(_curr_region != NULL, "invariant");
312 assert(_region_limit != NULL, "invariant");
313 // If object is before the local finger, push it onto the
314 // mark stack. If it's between the local finger and the
315 // end of the region, leave it to mark bit processing to
316 // take care of. Otherwise, check against the global
317 // finger.
318 if (objAddr < _finger) {
319 deal_with_reference_below_finger(obj, _finger, false);
320 return;
321 } else if (objAddr < _region_limit) {
322 return;
323 }
324 }
325 // No current region, or object is after the current region.
326 // Push onto mark stack if below global finger.
327 //
328 // Notice that the global finger might be moving forward
329 // concurrently. This is not a problem. In the worst case, we
330 // mark the object while it is above the global finger and, by
331 // the time we read the global finger, it has moved forward
332 // passed this object. In this case, the object will probably
333 // be visited when a task is scanning the region and will also
334 // be pushed on the stack. So, some duplicate work, but no
335 // correctness problems.
336 if (objAddr < global_finger) {
337 deal_with_reference_below_finger(obj, global_finger, true);
338 }
339 }
340 }
341 }
342 }
343 }
344
345 inline void ConcurrentMark::markPrev(oop p) {
346 assert(!_prevMarkBitMap->isMarked((HeapWord*) p), "sanity");
347 // Note we are overriding the read-only view of the prev map here, via
348 // the cast.
349 ((CMBitMap*)_prevMarkBitMap)->mark((HeapWord*) p);
350 }
351
352 inline void ConcurrentMark::grayRoot(oop obj, size_t word_size,
353 uint worker_id, HeapRegion* hr) {
354 assert(obj != NULL, "pre-condition");
355 HeapWord* addr = (HeapWord*) obj;
356 if (hr == NULL) {
357 hr = _g1h->heap_region_containing_raw(addr);
358 } else {
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