void GCMemoryManager::gc_end() {
_accumulated_timer.stop();
_last_gc_stat->set_end_time(Management::timestamp());
int i;
// keep the last gc statistics for all memory pools
for (i = 0; i < MemoryService::num_memory_pools(); i++) {
MemoryPool* pool = MemoryService::get_memory_pool(i);
MemoryUsage usage = pool->get_memory_usage();
HS_DTRACE_PROBE8(hotspot, mem__pool__gc__end,
name(), strlen(name()),
pool->name(), strlen(pool->name()),
usage.init_size(), usage.used(),
usage.committed(), usage.max_size());
_last_gc_stat->set_after_gc_usage(i, usage);
}
// Set last collection usage of the memory pools managed by this collector
for (i = 0; i < num_memory_pools(); i++) {
MemoryPool* pool = get_memory_pool(i);
MemoryUsage usage = pool->get_memory_usage();
// Compare with GC usage threshold
pool->set_last_collection_usage(usage);
LowMemoryDetector::detect_after_gc_memory(pool);
}
}
// A collector MUST, even if it does not complete for some reason,
// make a TraceMemoryManagerStats object where countCollection is true,
// to ensure the current gc stat is placed in _last_gc_stat.
void GCMemoryManager::gc_end(bool recordPostGCUsage,
bool recordAccumulatedGCTime,
bool recordGCEndTime, bool countCollection,
GCCause::Cause cause) {
if (recordAccumulatedGCTime) {
_accumulated_timer.stop();
}
if (recordGCEndTime) {
_current_gc_stat->set_end_time(Management::timestamp());
}
if (recordPostGCUsage) {
int i;
// keep the last gc statistics for all memory pools
for (i = 0; i < MemoryService::num_memory_pools(); i++) {
MemoryPool* pool = MemoryService::get_memory_pool(i);
MemoryUsage usage = pool->get_memory_usage();
HS_DTRACE_PROBE8(hotspot, mem__pool__gc__end,
name(), strlen(name()),
pool->name(), strlen(pool->name()),
usage.init_size(), usage.used(),
usage.committed(), usage.max_size());
_current_gc_stat->set_after_gc_usage(i, usage);
}
// Set last collection usage of the memory pools managed by this collector
for (i = 0; i < num_memory_pools(); i++) {
MemoryPool* pool = get_memory_pool(i);
MemoryUsage usage = pool->get_memory_usage();
// Compare with GC usage threshold
pool->set_last_collection_usage(usage);
LowMemoryDetector::detect_after_gc_memory(pool);
}
if(is_notification_enabled()) {
bool isMajorGC = this == MemoryService::get_major_gc_manager();
GCNotifier::pushNotification(this, isMajorGC ? "end of major GC" : "end of minor GC",
GCCause::to_string(cause));
}
}
if (countCollection) {
_num_collections++;
// alternately update two objects making one public when complete
{
MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag);
GCStatInfo *tmp = _last_gc_stat;
_last_gc_stat = _current_gc_stat;
_current_gc_stat = tmp;
// reset the current stat for diagnosability purposes
_current_gc_stat->clear();
}
}
}
void GCMemoryManager::gc_begin(bool recordGCBeginTime, bool recordPreGCUsage,
bool recordAccumulatedGCTime) {
assert(_last_gc_stat != NULL && _current_gc_stat != NULL, "Just checking");
if (recordAccumulatedGCTime) {
_accumulated_timer.start();
}
// _num_collections now increases in gc_end, to count completed collections
if (recordGCBeginTime) {
_current_gc_stat->set_index(_num_collections+1);
_current_gc_stat->set_start_time(Management::timestamp());
}
if (recordPreGCUsage) {
// Keep memory usage of all memory pools
for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
MemoryPool* pool = MemoryService::get_memory_pool(i);
MemoryUsage usage = pool->get_memory_usage();
_current_gc_stat->set_before_gc_usage(i, usage);
#ifndef USDT2
HS_DTRACE_PROBE8(hotspot, mem__pool__gc__begin,
name(), strlen(name()),
pool->name(), strlen(pool->name()),
usage.init_size(), usage.used(),
usage.committed(), usage.max_size());
#else /* USDT2 */
HOTSPOT_MEM_POOL_GC_BEGIN(
(char *) name(), strlen(name()),
(char *) pool->name(), strlen(pool->name()),
usage.init_size(), usage.used(),
usage.committed(), usage.max_size());
#endif /* USDT2 */
}
}
}
void GCMemoryManager::gc_begin() {
assert(_last_gc_stat != NULL, "Just checking");
_accumulated_timer.start();
_num_collections++;
_last_gc_stat->set_index(_num_collections);
_last_gc_stat->set_start_time(Management::timestamp());
// Keep memory usage of all memory pools
for (int i = 0; i < MemoryService::num_memory_pools(); i++) {
MemoryPool* pool = MemoryService::get_memory_pool(i);
MemoryUsage usage = pool->get_memory_usage();
_last_gc_stat->set_before_gc_usage(i, usage);
HS_DTRACE_PROBE8(hotspot, mem__pool__gc__begin,
name(), strlen(name()),
pool->name(), strlen(pool->name()),
usage.init_size(), usage.used(),
usage.committed(), usage.max_size());
}
}
// 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();
}
}
