// This method could be called from any Java threads // and also VMThread. void LowMemoryDetector::detect_low_memory(MemoryPool* pool) { SensorInfo* sensor = pool->usage_sensor(); if (sensor == NULL || !pool->usage_threshold()->is_high_threshold_supported() || pool->usage_threshold()->high_threshold() == 0) { return; } { MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); MemoryUsage usage = pool->get_memory_usage(); sensor->set_gauge_sensor_level(usage, pool->usage_threshold()); if (sensor->has_pending_requests()) { // notify sensor state update Service_lock->notify_all(); } } }
// This method could be called from any Java threads // and also VMThread. void LowMemoryDetector::detect_low_memory() { MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); bool has_pending_requests = false; int num_memory_pools = MemoryService::num_memory_pools(); for (int i = 0; i < num_memory_pools; i++) { MemoryPool* pool = MemoryService::get_memory_pool(i); SensorInfo* sensor = pool->usage_sensor(); if (sensor != NULL && pool->usage_threshold()->is_high_threshold_supported() && pool->usage_threshold()->high_threshold() != 0) { MemoryUsage usage = pool->get_memory_usage(); sensor->set_gauge_sensor_level(usage, pool->usage_threshold()); has_pending_requests = has_pending_requests || sensor->has_pending_requests(); } } if (has_pending_requests) { Service_lock->notify_all(); } }