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8209700: Remove HeapRegionSetBase::RegionSetKind for a more flexible approach

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Reviewed-by: kbarrett, phh
This commit is contained in:
Thomas Schatzl 2018-08-22 20:37:07 +02:00
parent 0cad83662a
commit 5c94ea21e7
5 changed files with 126 additions and 130 deletions
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37
src/hotspot/share/gc/g1/heapRegionManager.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2001, 2017, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2001, 2018, 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
@ -30,6 +30,41 @@
#include "gc/g1/heapRegionSet.inline.hpp"
#include "memory/allocation.hpp"
class MasterFreeRegionListChecker : public HeapRegionSetChecker {
public:
void check_mt_safety() {
// Master Free List MT safety protocol:
// (a) If we're at a safepoint, operations on the master free list
// should be invoked by either the VM thread (which will serialize
// them) or by the GC workers while holding the
// FreeList_lock.
// (b) If we're not at a safepoint, operations on the master free
// list should be invoked while holding the Heap_lock.
if (SafepointSynchronize::is_at_safepoint()) {
guarantee(Thread::current()->is_VM_thread() ||
FreeList_lock->owned_by_self(), "master free list MT safety protocol at a safepoint");
} else {
guarantee(Heap_lock->owned_by_self(), "master free list MT safety protocol outside a safepoint");
}
}
bool is_correct_type(HeapRegion* hr) { return hr->is_free(); }
const char* get_description() { return "Free Regions"; }
};
HeapRegionManager::HeapRegionManager() :
_regions(), _heap_mapper(NULL),
_prev_bitmap_mapper(NULL),
_next_bitmap_mapper(NULL),
_bot_mapper(NULL),
_cardtable_mapper(NULL),
_card_counts_mapper(NULL),
_free_list("Free list", new MasterFreeRegionListChecker()),
_available_map(mtGC),
_num_committed(0),
_allocated_heapregions_length(0)
{ }
void HeapRegionManager::initialize(G1RegionToSpaceMapper* heap_storage,
G1RegionToSpaceMapper* prev_bitmap,
G1RegionToSpaceMapper* next_bitmap,