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8157952: Parallelize Memory Pretouch

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Use multiple threads to pretouch memory using -XX:+AlwaysPreTouch to use more memory bandwidth

Reviewed-by: jmasa, sangheki
This commit is contained in:
Thomas Schatzl 2016-09-16 11:33:47 +02:00
parent b77d0de3d9
commit 317f1aa044
12 changed files with 124 additions and 39 deletions
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28
hotspot/src/share/vm/gc/g1/heapRegionManager.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -72,22 +72,22 @@ HeapRegion* HeapRegionManager::new_heap_region(uint hrm_index) {
return g1h->new_heap_region(hrm_index, mr);
}
void HeapRegionManager::commit_regions(uint index, size_t num_regions) {
void HeapRegionManager::commit_regions(uint index, size_t num_regions, WorkGang* pretouch_gang) {
guarantee(num_regions > 0, "Must commit more than zero regions");
guarantee(_num_committed + num_regions <= max_length(), "Cannot commit more than the maximum amount of regions");
_num_committed += (uint)num_regions;
_heap_mapper->commit_regions(index, num_regions);
_heap_mapper->commit_regions(index, num_regions, pretouch_gang);
// Also commit auxiliary data
_prev_bitmap_mapper->commit_regions(index, num_regions);
_next_bitmap_mapper->commit_regions(index, num_regions);
_prev_bitmap_mapper->commit_regions(index, num_regions, pretouch_gang);
_next_bitmap_mapper->commit_regions(index, num_regions, pretouch_gang);
_bot_mapper->commit_regions(index, num_regions);
_cardtable_mapper->commit_regions(index, num_regions);
_bot_mapper->commit_regions(index, num_regions, pretouch_gang);
_cardtable_mapper->commit_regions(index, num_regions, pretouch_gang);
_card_counts_mapper->commit_regions(index, num_regions);
_card_counts_mapper->commit_regions(index, num_regions, pretouch_gang);
}
void HeapRegionManager::uncommit_regions(uint start, size_t num_regions) {
@ -117,9 +117,9 @@ void HeapRegionManager::uncommit_regions(uint start, size_t num_regions) {
_card_counts_mapper->uncommit_regions(start, num_regions);
}
void HeapRegionManager::make_regions_available(uint start, uint num_regions) {
void HeapRegionManager::make_regions_available(uint start, uint num_regions, WorkGang* pretouch_gang) {
guarantee(num_regions > 0, "No point in calling this for zero regions");
commit_regions(start, num_regions);
commit_regions(start, num_regions, pretouch_gang);
for (uint i = start; i < start + num_regions; i++) {
if (_regions.get_by_index(i) == NULL) {
HeapRegion* new_hr = new_heap_region(i);
@ -163,11 +163,11 @@ MemoryUsage HeapRegionManager::get_auxiliary_data_memory_usage() const {
return MemoryUsage(0, used_sz, committed_sz, committed_sz);
}
uint HeapRegionManager::expand_by(uint num_regions) {
return expand_at(0, num_regions);
uint HeapRegionManager::expand_by(uint num_regions, WorkGang* pretouch_workers) {
return expand_at(0, num_regions, pretouch_workers);
}
uint HeapRegionManager::expand_at(uint start, uint num_regions) {
uint HeapRegionManager::expand_at(uint start, uint num_regions, WorkGang* pretouch_workers) {
if (num_regions == 0) {
return 0;
}
@ -181,7 +181,7 @@ uint HeapRegionManager::expand_at(uint start, uint num_regions) {
while (expanded < num_regions &&
(num_last_found = find_unavailable_from_idx(cur, &idx_last_found)) > 0) {
uint to_expand = MIN2(num_regions - expanded, num_last_found);
make_regions_available(idx_last_found, to_expand);
make_regions_available(idx_last_found, to_expand, pretouch_workers);
expanded += to_expand;
cur = idx_last_found + num_last_found + 1;
}