Added zone pool metrics to gc-trace.

src/zone/accounting-allocator.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/zone/accounting-allocator.h"
 
 #include <cstdlib>
 
 #if V8_LIBC_BIONIC
 #include <malloc.h>  // NOLINT
@@ skipping 66 matching lines @@
 }
 
 size_t AccountingAllocator::GetCurrentMemoryUsage() const {
   return base::NoBarrier_Load(&current_memory_usage_);
 }
 
 size_t AccountingAllocator::GetMaxMemoryUsage() const {
   return base::NoBarrier_Load(&max_memory_usage_);
 }
 
+size_t AccountingAllocator::GetCurrentPoolSize() const {
+  return base::NoBarrier_Load(&current_pool_size_);
+}
+
 Segment* AccountingAllocator::GetSegmentFromPool(size_t requested_size) {
   if (requested_size > (1 << kMaxSegmentSizePower)) {
     return nullptr;
   }
 
   uint8_t power = kMinSegmentSizePower;
   while (requested_size > static_cast<size_t>(1 << power)) power++;
 
   DCHECK_GE(power, kMinSegmentSizePower + 0);
   power -= kMinSegmentSizePower;
 
   Segment* segment;
   {
     base::LockGuard<base::Mutex> lock_guard(&unused_segments_mutex_);
 
     segment = unused_segments_heads_[power];
 
     if (segment != nullptr) {
       unused_segments_heads_[power] = segment->next();
       segment->set_next(nullptr);
 
       unused_segments_sizes[power]--;
-      unused_segments_size_ -= segment->size();
+      base::NoBarrier_AtomicIncrement(
+          &current_pool_size_, -static_cast<base::AtomicWord>(segment->size()));
     }
   }
 
   if (segment) {
     DCHECK_GE(segment->size(), requested_size);
   }
   return segment;
 }
 
 bool AccountingAllocator::AddSegmentToPool(Segment* segment) {
@@ skipping 12 matching lines @@
 
   {
     base::LockGuard<base::Mutex> lock_guard(&unused_segments_mutex_);
 
     if (unused_segments_sizes[power] >= kMaxSegmentsPerBucket) {
       return false;
     }
 
     segment->set_next(unused_segments_heads_[power]);
     unused_segments_heads_[power] = segment;
-    unused_segments_size_ += size;
+    base::NoBarrier_AtomicIncrement(&current_pool_size_, size);
     unused_segments_sizes[power]++;
   }
 
   return true;
 }
 
 void AccountingAllocator::ClearPool() {
   base::LockGuard<base::Mutex> lock_guard(&unused_segments_mutex_);
 
   for (uint8_t power = 0; power <= kMaxSegmentSizePower - kMinSegmentSizePower;
        power++) {
     Segment* current = unused_segments_heads_[power];
     while (current) {
       Segment* next = current->next();
       FreeSegment(current);
       current = next;
     }
     unused_segments_heads_[power] = nullptr;
   }
 }
 
 }  // namespace internal
 }  // namespace v8