Mercurial > hg > graal-compiler
view src/share/vm/services/lowMemoryDetector.cpp @ 6267:977007096840
7187290: nightly failures after JSR 292 lazy method handle update
Reviewed-by: kvn, twisti
author | twisti |
---|---|
date | Fri, 27 Jul 2012 16:14:15 -0700 |
parents | bf8517f4e4d0 |
children | da91efe96a93 |
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/* * Copyright (c) 2003, 2011, 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 * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "precompiled.hpp" #include "classfile/systemDictionary.hpp" #include "classfile/vmSymbols.hpp" #include "oops/oop.inline.hpp" #include "runtime/interfaceSupport.hpp" #include "runtime/java.hpp" #include "runtime/javaCalls.hpp" #include "runtime/mutex.hpp" #include "runtime/mutexLocker.hpp" #include "services/lowMemoryDetector.hpp" #include "services/management.hpp" volatile bool LowMemoryDetector::_enabled_for_collected_pools = false; volatile jint LowMemoryDetector::_disabled_count = 0; bool LowMemoryDetector::has_pending_requests() { assert(Service_lock->owned_by_self(), "Must own Service_lock"); bool has_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) { has_requests = has_requests || sensor->has_pending_requests(); } SensorInfo* gc_sensor = pool->gc_usage_sensor(); if (gc_sensor != NULL) { has_requests = has_requests || gc_sensor->has_pending_requests(); } } return has_requests; } void LowMemoryDetector::process_sensor_changes(TRAPS) { ResourceMark rm(THREAD); HandleMark hm(THREAD); // No need to hold Service_lock to call out to Java 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(); SensorInfo* gc_sensor = pool->gc_usage_sensor(); if (sensor != NULL && sensor->has_pending_requests()) { sensor->process_pending_requests(CHECK); } if (gc_sensor != NULL && gc_sensor->has_pending_requests()) { gc_sensor->process_pending_requests(CHECK); } } } // 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(); } } // 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(); } } } // Only called by VMThread at GC time void LowMemoryDetector::detect_after_gc_memory(MemoryPool* pool) { SensorInfo* sensor = pool->gc_usage_sensor(); if (sensor == NULL || !pool->gc_usage_threshold()->is_high_threshold_supported() || pool->gc_usage_threshold()->high_threshold() == 0) { return; } { MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); MemoryUsage usage = pool->get_last_collection_usage(); sensor->set_counter_sensor_level(usage, pool->gc_usage_threshold()); if (sensor->has_pending_requests()) { // notify sensor state update Service_lock->notify_all(); } } } // recompute enabled flag void LowMemoryDetector::recompute_enabled_for_collected_pools() { bool enabled = 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); if (pool->is_collected_pool() && is_enabled(pool)) { enabled = true; break; } } _enabled_for_collected_pools = enabled; } SensorInfo::SensorInfo() { _sensor_obj = NULL; _sensor_on = false; _sensor_count = 0; _pending_trigger_count = 0; _pending_clear_count = 0; } // When this method is used, the memory usage is monitored // as a gauge attribute. Sensor notifications (trigger or // clear) is only emitted at the first time it crosses // a threshold. // // High and low thresholds are designed to provide a // hysteresis mechanism to avoid repeated triggering // of notifications when the attribute value makes small oscillations // around the high or low threshold value. // // The sensor will be triggered if: // (1) the usage is crossing above the high threshold and // the sensor is currently off and no pending // trigger requests; or // (2) the usage is crossing above the high threshold and // the sensor will be off (i.e. sensor is currently on // and has pending clear requests). // // Subsequent crossings of the high threshold value do not cause // any triggers unless the usage becomes less than the low threshold. // // The sensor will be cleared if: // (1) the usage is crossing below the low threshold and // the sensor is currently on and no pending // clear requests; or // (2) the usage is crossing below the low threshold and // the sensor will be on (i.e. sensor is currently off // and has pending trigger requests). // // Subsequent crossings of the low threshold value do not cause // any clears unless the usage becomes greater than or equal // to the high threshold. // // If the current level is between high and low threhsold, no change. // void SensorInfo::set_gauge_sensor_level(MemoryUsage usage, ThresholdSupport* high_low_threshold) { assert(high_low_threshold->is_high_threshold_supported(), "just checking"); bool is_over_high = high_low_threshold->is_high_threshold_crossed(usage); bool is_below_low = high_low_threshold->is_low_threshold_crossed(usage); assert(!(is_over_high && is_below_low), "Can't be both true"); if (is_over_high && ((!_sensor_on && _pending_trigger_count == 0) || _pending_clear_count > 0)) { // low memory detected and need to increment the trigger pending count // if the sensor is off or will be off due to _pending_clear_ > 0 // Request to trigger the sensor _pending_trigger_count++; _usage = usage; if (_pending_clear_count > 0) { // non-zero pending clear requests indicates that there are // pending requests to clear this sensor. // This trigger request needs to clear this clear count // since the resulting sensor flag should be on. _pending_clear_count = 0; } } else if (is_below_low && ((_sensor_on && _pending_clear_count == 0) || (_pending_trigger_count > 0 && _pending_clear_count == 0))) { // memory usage returns below the threshold // Request to clear the sensor if the sensor is on or will be on due to // _pending_trigger_count > 0 and also no clear request _pending_clear_count++; } } // When this method is used, the memory usage is monitored as a // simple counter attribute. The sensor will be triggered // whenever the usage is crossing the threshold to keep track // of the number of times the VM detects such a condition occurs. // // High and low thresholds are designed to provide a // hysteresis mechanism to avoid repeated triggering // of notifications when the attribute value makes small oscillations // around the high or low threshold value. // // The sensor will be triggered if: // - the usage is crossing above the high threshold regardless // of the current sensor state. // // The sensor will be cleared if: // (1) the usage is crossing below the low threshold and // the sensor is currently on; or // (2) the usage is crossing below the low threshold and // the sensor will be on (i.e. sensor is currently off // and has pending trigger requests). void SensorInfo::set_counter_sensor_level(MemoryUsage usage, ThresholdSupport* counter_threshold) { assert(counter_threshold->is_high_threshold_supported(), "just checking"); bool is_over_high = counter_threshold->is_high_threshold_crossed(usage); bool is_below_low = counter_threshold->is_low_threshold_crossed(usage); assert(!(is_over_high && is_below_low), "Can't be both true"); if (is_over_high) { _pending_trigger_count++; _usage = usage; _pending_clear_count = 0; } else if (is_below_low && (_sensor_on || _pending_trigger_count > 0)) { _pending_clear_count++; } } void SensorInfo::oops_do(OopClosure* f) { f->do_oop((oop*) &_sensor_obj); } void SensorInfo::process_pending_requests(TRAPS) { if (!has_pending_requests()) { return; } int pending_count = pending_trigger_count(); if (pending_clear_count() > 0) { clear(pending_count, CHECK); } else { trigger(pending_count, CHECK); } } void SensorInfo::trigger(int count, TRAPS) { assert(count <= _pending_trigger_count, "just checking"); if (_sensor_obj != NULL) { klassOop k = Management::sun_management_Sensor_klass(CHECK); instanceKlassHandle sensorKlass (THREAD, k); Handle sensor_h(THREAD, _sensor_obj); Handle usage_h = MemoryService::create_MemoryUsage_obj(_usage, CHECK); JavaValue result(T_VOID); JavaCallArguments args(sensor_h); args.push_int((int) count); args.push_oop(usage_h); JavaCalls::call_virtual(&result, sensorKlass, vmSymbols::trigger_name(), vmSymbols::trigger_method_signature(), &args, CHECK); } { // Holds Service_lock and update the sensor state MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); _sensor_on = true; _sensor_count += count; _pending_trigger_count = _pending_trigger_count - count; } } void SensorInfo::clear(int count, TRAPS) { if (_sensor_obj != NULL) { klassOop k = Management::sun_management_Sensor_klass(CHECK); instanceKlassHandle sensorKlass (THREAD, k); Handle sensor(THREAD, _sensor_obj); JavaValue result(T_VOID); JavaCallArguments args(sensor); args.push_int((int) count); JavaCalls::call_virtual(&result, sensorKlass, vmSymbols::clear_name(), vmSymbols::int_void_signature(), &args, CHECK); } { // Holds Service_lock and update the sensor state MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); _sensor_on = false; _pending_clear_count = 0; _pending_trigger_count = _pending_trigger_count - count; } } //-------------------------------------------------------------- // Non-product code #ifndef PRODUCT void SensorInfo::print() { tty->print_cr("%s count = %ld pending_triggers = %ld pending_clears = %ld", (_sensor_on ? "on" : "off"), _sensor_count, _pending_trigger_count, _pending_clear_count); } #endif // PRODUCT