228 if (cur_pos == len) {
229 cur_pos = 0;
230 }
231 } while (cur_pos != start_pos);
232 }
233
234 void G1CollectionSet::update_young_region_prediction(HeapRegion* hr,
235 size_t new_rs_length) {
236 // Update the CSet information that is dependent on the new RS length
237 assert(hr->is_young(), "Precondition");
238 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at a safepoint");
239
240 size_t old_rs_length = hr->recorded_rs_length();
241 assert(old_rs_length <= new_rs_length,
242 "Remembered set sizes must increase (changed from " SIZE_FORMAT " to " SIZE_FORMAT " region %u type %s)",
243 old_rs_length, new_rs_length, hr->hrm_index(), hr->get_short_type_str());
244 size_t rs_length_diff = new_rs_length - old_rs_length;
245 hr->set_recorded_rs_length(new_rs_length);
246 _inc_recorded_rs_length_diff += rs_length_diff;
247
248 double old_elapsed_time_ms = hr->predicted_non_copy_time_ms();
249 double new_region_elapsed_time_ms = predict_region_non_copy_time_ms(hr);
250 double non_copy_time_ms_diff = new_region_elapsed_time_ms - old_elapsed_time_ms;
251 hr->set_predicted_non_copy_time_ms(new_region_elapsed_time_ms);
252 _inc_predicted_non_copy_time_ms_diff += non_copy_time_ms_diff;
253 }
254
255 void G1CollectionSet::add_young_region_common(HeapRegion* hr) {
256 assert(hr->is_young(), "invariant");
257 assert(_inc_build_state == Active, "Precondition");
258
259 // This routine is used when:
260 // * adding survivor regions to the incremental cset at the end of an
261 // evacuation pause or
262 // * adding the current allocation region to the incremental cset
263 // when it is retired.
264 // Therefore this routine may be called at a safepoint by the
265 // VM thread, or in-between safepoints by mutator threads (when
266 // retiring the current allocation region)
267 // We need to clear and set the cached recorded/cached collection set
268 // information in the heap region here (before the region gets added
269 // to the collection set). An individual heap region's cached values
270 // are calculated, aggregated with the policy collection set info,
271 // and cached in the heap region here (initially) and (subsequently)
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228 if (cur_pos == len) {
229 cur_pos = 0;
230 }
231 } while (cur_pos != start_pos);
232 }
233
234 void G1CollectionSet::update_young_region_prediction(HeapRegion* hr,
235 size_t new_rs_length) {
236 // Update the CSet information that is dependent on the new RS length
237 assert(hr->is_young(), "Precondition");
238 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at a safepoint");
239
240 size_t old_rs_length = hr->recorded_rs_length();
241 assert(old_rs_length <= new_rs_length,
242 "Remembered set sizes must increase (changed from " SIZE_FORMAT " to " SIZE_FORMAT " region %u type %s)",
243 old_rs_length, new_rs_length, hr->hrm_index(), hr->get_short_type_str());
244 size_t rs_length_diff = new_rs_length - old_rs_length;
245 hr->set_recorded_rs_length(new_rs_length);
246 _inc_recorded_rs_length_diff += rs_length_diff;
247
248 double old_non_copy_time = hr->predicted_non_copy_time_ms();
249 double new_non_copy_time = predict_region_non_copy_time_ms(hr);
250 double non_copy_time_ms_diff = new_non_copy_time - old_non_copy_time;
251 hr->set_predicted_non_copy_time_ms(new_non_copy_time);
252 _inc_predicted_non_copy_time_ms_diff += non_copy_time_ms_diff;
253 }
254
255 void G1CollectionSet::add_young_region_common(HeapRegion* hr) {
256 assert(hr->is_young(), "invariant");
257 assert(_inc_build_state == Active, "Precondition");
258
259 // This routine is used when:
260 // * adding survivor regions to the incremental cset at the end of an
261 // evacuation pause or
262 // * adding the current allocation region to the incremental cset
263 // when it is retired.
264 // Therefore this routine may be called at a safepoint by the
265 // VM thread, or in-between safepoints by mutator threads (when
266 // retiring the current allocation region)
267 // We need to clear and set the cached recorded/cached collection set
268 // information in the heap region here (before the region gets added
269 // to the collection set). An individual heap region's cached values
270 // are calculated, aggregated with the policy collection set info,
271 // and cached in the heap region here (initially) and (subsequently)
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