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8165313: Inserting freed regions during Free Collection Set serial phase takes very long on huge heaps

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Sort the collection set in ascending order so that the optimization when adding free regions can be exploited.

Reviewed-by: sjohanss, mgerdin
This commit is contained in:
Thomas Schatzl 2016-09-12 09:34:51 +02:00
parent 4c5520208b
commit 1075dcd335
1 changed files with 13 additions and 0 deletions
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13
hotspot/src/share/vm/gc/g1/g1CollectionSet.cpp
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@ -32,6 +32,7 @@
#include "gc/g1/heapRegionSet.hpp"
#include "logging/logStream.hpp"
#include "utilities/debug.hpp"
#include "utilities/quickSort.hpp"
G1CollectorState* G1CollectionSet::collector_state() {
return _g1->collector_state();
@ -396,6 +397,16 @@ double G1CollectionSet::finalize_young_part(double target_pause_time_ms, G1Survi
return time_remaining_ms;
}
static int compare_region_idx(const uint a, const uint b) {
if (a > b) {
return 1;
} else if (a == b) {
return 0;
} else {
return -1;
}
}
void G1CollectionSet::finalize_old_part(double time_remaining_ms) {
double non_young_start_time_sec = os::elapsedTime();
double predicted_old_time_ms = 0.0;
@ -493,6 +504,8 @@ void G1CollectionSet::finalize_old_part(double time_remaining_ms) {
double non_young_end_time_sec = os::elapsedTime();
phase_times()->record_non_young_cset_choice_time_ms((non_young_end_time_sec - non_young_start_time_sec) * 1000.0);
QuickSort::sort<uint>(_collection_set_regions, (int)_collection_set_cur_length, compare_region_idx, true);
}
#ifdef ASSERT