void V8GCController::majorGCEpilogue()
{
v8::HandleScope scope;
// The GC can happen on multiple threads in case of dedicated workers which run in-process.
{
MutexLocker locker(workingSetEstimateMBMutex());
workingSetEstimateMB = MemoryUsageSupport::actualMemoryUsageMB();
}
TRACE_EVENT_END0("v8", "GC");
}
void V8GCController::checkMemoryUsage()
{
#if PLATFORM(CHROMIUM)
const int lowMemoryUsageMB = MemoryUsageSupport::lowMemoryUsageMB();
const int highMemoryUsageMB = MemoryUsageSupport::highMemoryUsageMB();
const int highUsageDeltaMB = MemoryUsageSupport::highUsageDeltaMB();
int memoryUsageMB = MemoryUsageSupport::memoryUsageMB();
int workingSetEstimateMBCopy;
{
MutexLocker locker(workingSetEstimateMBMutex());
workingSetEstimateMBCopy = workingSetEstimateMB;
}
if ((memoryUsageMB > lowMemoryUsageMB && memoryUsageMB > 2 * workingSetEstimateMBCopy) || (memoryUsageMB > highMemoryUsageMB && memoryUsageMB > workingSetEstimateMBCopy + highUsageDeltaMB))
v8::V8::LowMemoryNotification();
#endif
}
void V8GCController::checkMemoryUsage()
{
const int lowMemoryUsageMB = MemoryUsageSupport::lowMemoryUsageMB();
const int highMemoryUsageMB = MemoryUsageSupport::highMemoryUsageMB();
const int highUsageDeltaMB = MemoryUsageSupport::highUsageDeltaMB();
int memoryUsageMB = MemoryUsageSupport::memoryUsageMB();
int workingSetEstimateMBCopy;
{
MutexLocker locker(workingSetEstimateMBMutex());
workingSetEstimateMBCopy = workingSetEstimateMB;
}
if (memoryUsageMB > lowMemoryUsageMB && memoryUsageMB > 2 * workingSetEstimateMBCopy) {
// Memory usage is large and doubled since the last GC.
// Check if we need to send low memory notification.
v8::HeapStatistics heapStatistics;
v8::V8::GetHeapStatistics(&heapStatistics);
int heapSizeMB = heapStatistics.total_heap_size() >> 20;
// Do not send low memory notification if V8 heap size is more than 7/8
// of total memory usage. Let V8 to schedule GC itself in this case.
if (heapSizeMB < memoryUsageMB / 8 * 7)
v8::V8::LowMemoryNotification();
} else if (memoryUsageMB > highMemoryUsageMB && memoryUsageMB > workingSetEstimateMBCopy + highUsageDeltaMB) {
