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Side by Side Diff: src/compiler/zone-pool.cc

Issue 2348303002: Replaced different means of zone pooling/reusing by one zone segment pool (Closed)
Patch Set: Added most recent changes from master Created 4 years, 2 months ago
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1 // Copyright 2014 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "src/compiler/zone-pool.h"
6
7 namespace v8 {
8 namespace internal {
9 namespace compiler {
10
11 ZonePool::StatsScope::StatsScope(ZonePool* zone_pool)
12 : zone_pool_(zone_pool),
13 total_allocated_bytes_at_start_(zone_pool->GetTotalAllocatedBytes()),
14 max_allocated_bytes_(0) {
15 zone_pool_->stats_.push_back(this);
16 for (Zone* zone : zone_pool_->used_) {
17 size_t size = static_cast<size_t>(zone->allocation_size());
18 std::pair<InitialValues::iterator, bool> res =
19 initial_values_.insert(std::make_pair(zone, size));
20 USE(res);
21 DCHECK(res.second);
22 }
23 }
24
25
26 ZonePool::StatsScope::~StatsScope() {
27 DCHECK_EQ(zone_pool_->stats_.back(), this);
28 zone_pool_->stats_.pop_back();
29 }
30
31
32 size_t ZonePool::StatsScope::GetMaxAllocatedBytes() {
33 return std::max(max_allocated_bytes_, GetCurrentAllocatedBytes());
34 }
35
36
37 size_t ZonePool::StatsScope::GetCurrentAllocatedBytes() {
38 size_t total = 0;
39 for (Zone* zone : zone_pool_->used_) {
40 total += static_cast<size_t>(zone->allocation_size());
41 // Adjust for initial values.
42 InitialValues::iterator it = initial_values_.find(zone);
43 if (it != initial_values_.end()) {
44 total -= it->second;
45 }
46 }
47 return total;
48 }
49
50
51 size_t ZonePool::StatsScope::GetTotalAllocatedBytes() {
52 return zone_pool_->GetTotalAllocatedBytes() - total_allocated_bytes_at_start_;
53 }
54
55
56 void ZonePool::StatsScope::ZoneReturned(Zone* zone) {
57 size_t current_total = GetCurrentAllocatedBytes();
58 // Update max.
59 max_allocated_bytes_ = std::max(max_allocated_bytes_, current_total);
60 // Drop zone from initial value map.
61 InitialValues::iterator it = initial_values_.find(zone);
62 if (it != initial_values_.end()) {
63 initial_values_.erase(it);
64 }
65 }
66
67 ZonePool::ZonePool(AccountingAllocator* allocator)
68 : max_allocated_bytes_(0), total_deleted_bytes_(0), allocator_(allocator) {}
69
70 ZonePool::~ZonePool() {
71 DCHECK(used_.empty());
72 DCHECK(stats_.empty());
73 for (Zone* zone : unused_) {
74 delete zone;
75 }
76 }
77
78
79 size_t ZonePool::GetMaxAllocatedBytes() {
80 return std::max(max_allocated_bytes_, GetCurrentAllocatedBytes());
81 }
82
83
84 size_t ZonePool::GetCurrentAllocatedBytes() {
85 size_t total = 0;
86 for (Zone* zone : used_) {
87 total += static_cast<size_t>(zone->allocation_size());
88 }
89 return total;
90 }
91
92
93 size_t ZonePool::GetTotalAllocatedBytes() {
94 return total_deleted_bytes_ + GetCurrentAllocatedBytes();
95 }
96
97
98 Zone* ZonePool::NewEmptyZone() {
99 Zone* zone;
100 // Grab a zone from pool if possible.
101 if (!unused_.empty()) {
102 zone = unused_.back();
103 unused_.pop_back();
104 } else {
105 zone = new Zone(allocator_);
106 }
107 used_.push_back(zone);
108 DCHECK_EQ(0u, zone->allocation_size());
109 return zone;
110 }
111
112
113 void ZonePool::ReturnZone(Zone* zone) {
114 size_t current_total = GetCurrentAllocatedBytes();
115 // Update max.
116 max_allocated_bytes_ = std::max(max_allocated_bytes_, current_total);
117 // Update stats.
118 for (StatsScope* stat_scope : stats_) {
119 stat_scope->ZoneReturned(zone);
120 }
121 // Remove from used.
122 Used::iterator it = std::find(used_.begin(), used_.end(), zone);
123 DCHECK(it != used_.end());
124 used_.erase(it);
125 total_deleted_bytes_ += static_cast<size_t>(zone->allocation_size());
126 // Delete zone or clear and stash on unused_.
127 if (unused_.size() >= kMaxUnusedSize) {
128 delete zone;
129 } else {
130 zone->DeleteAll();
131 DCHECK_EQ(0u, zone->allocation_size());
132 unused_.push_back(zone);
133 }
134 }
135
136 } // namespace compiler
137 } // namespace internal
138 } // namespace v8
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