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8193184: NMT: Report array class count in NMT summary

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Report array class and instance class count in NMT summary report

Reviewed-by: coleenp, minqi
This commit is contained in:
Zhengyu Gu 2018-02-06 08:24:36 -05:00
parent 48f208f193
commit 41ace19206
12 changed files with 192 additions and 31 deletions
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44
src/hotspot/share/classfile/classLoaderData.cpp
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@ -80,6 +80,9 @@
#include "trace/tracing.hpp"
#endif
volatile size_t ClassLoaderDataGraph::_num_array_classes = 0;
volatile size_t ClassLoaderDataGraph::_num_instance_classes = 0;
ClassLoaderData * ClassLoaderData::_the_null_class_loader_data = NULL;
ClassLoaderData::ClassLoaderData(Handle h_class_loader, bool is_anonymous, Dependencies dependencies) :
@ -443,6 +446,11 @@ void ClassLoaderData::add_class(Klass* k, bool publicize /* true */) {
// Link the new item into the list, making sure the linked class is stable
// since the list can be walked without a lock
OrderAccess::release_store(&_klasses, k);
if (k->is_array_klass()) {
ClassLoaderDataGraph::inc_array_classes(1);
} else {
ClassLoaderDataGraph::inc_instance_classes(1);
}
}
if (publicize && k->class_loader_data() != NULL) {
@ -468,7 +476,7 @@ class ClassLoaderDataGraphKlassIteratorStatic {
InstanceKlass* try_get_next_class() {
assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
int max_classes = InstanceKlass::number_of_instance_classes();
int max_classes = ClassLoaderDataGraph::num_instance_classes();
assert(max_classes > 0, "should not be called with no instance classes");
for (int i = 0; i < max_classes; ) {
@ -545,6 +553,13 @@ void ClassLoaderData::remove_class(Klass* scratch_class) {
Klass* next = k->next_link();
prev->set_next_link(next);
}
if (k->is_array_klass()) {
ClassLoaderDataGraph::dec_array_classes(1);
} else {
ClassLoaderDataGraph::dec_instance_classes(1);
}
return;
}
prev = k;
@ -639,9 +654,34 @@ bool ClassLoaderData::is_alive(BoolObjectClosure* is_alive_closure) const {
return alive;
}
class ReleaseKlassClosure: public KlassClosure {
private:
size_t _instance_class_released;
size_t _array_class_released;
public:
ReleaseKlassClosure() : _instance_class_released(0), _array_class_released(0) { }
size_t instance_class_released() const { return _instance_class_released; }
size_t array_class_released() const { return _array_class_released; }
void do_klass(Klass* k) {
if (k->is_array_klass()) {
_array_class_released ++;
} else {
assert(k->is_instance_klass(), "Must be");
_instance_class_released ++;
InstanceKlass::release_C_heap_structures(InstanceKlass::cast(k));
}
}
};
ClassLoaderData::~ClassLoaderData() {
// Release C heap structures for all the classes.
classes_do(InstanceKlass::release_C_heap_structures);
ReleaseKlassClosure cl;
classes_do(&cl);
ClassLoaderDataGraph::dec_array_classes(cl.array_class_released());
ClassLoaderDataGraph::dec_instance_classes(cl.instance_class_released());
// Release C heap allocated hashtable for all the packages.
if (_packages != NULL) {