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comparison src/share/vm/gc_implementation/g1/g1RemSet.cpp @ 4097:dc467e8b2c5e

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7112743: G1: Reduce overhead of marking closure during evacuation pauses Summary: Parallelize the serial code that was used to mark objects reachable from survivor objects in the collection set. Some minor improvments in the timers used to track the freeing of the collection set along with some tweaks to PrintGCDetails. Reviewed-by: tonyp, brutisso
author johnc
date Thu, 17 Nov 2011 12:40:15 -0800
parents bca17e38de00
children 441e946dc1af
comparison
equal deleted inserted replaced
4096:00dd86e542eb 4097:dc467e8b2c5e
207 } 207 }
208 size_t cards_done() { return _cards_done;} 208 size_t cards_done() { return _cards_done;}
209 size_t cards_looked_up() { return _cards;} 209 size_t cards_looked_up() { return _cards;}
210 }; 210 };
211 211
212 // We want the parallel threads to start their scanning at
213 // different collection set regions to avoid contention.
214 // If we have:
215 // n collection set regions
216 // p threads
217 // Then thread t will start at region t * floor (n/p)
218
219 HeapRegion* G1RemSet::calculateStartRegion(int worker_i) {
220 HeapRegion* result = _g1p->collection_set();
221 if (G1CollectedHeap::use_parallel_gc_threads()) {
222 size_t cs_size = _g1p->cset_region_length();
223 int n_workers = _g1->workers()->total_workers();
224 size_t cs_spans = cs_size / n_workers;
225 size_t ind = cs_spans * worker_i;
226 for (size_t i = 0; i < ind; i++)
227 result = result->next_in_collection_set();
228 }
229 return result;
230 }
231
232 void G1RemSet::scanRS(OopsInHeapRegionClosure* oc, int worker_i) { 212 void G1RemSet::scanRS(OopsInHeapRegionClosure* oc, int worker_i) {
233 double rs_time_start = os::elapsedTime(); 213 double rs_time_start = os::elapsedTime();
234 HeapRegion *startRegion = calculateStartRegion(worker_i); 214 HeapRegion *startRegion = _g1->start_cset_region_for_worker(worker_i);
235 215
236 ScanRSClosure scanRScl(oc, worker_i); 216 ScanRSClosure scanRScl(oc, worker_i);
237 217
238 _g1->collection_set_iterate_from(startRegion, &scanRScl); 218 _g1->collection_set_iterate_from(startRegion, &scanRScl);
239 scanRScl.set_try_claimed(); 219 scanRScl.set_try_claimed();