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src/hotspot/share/gc/epsilon/epsilonHeap.cpp
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rev 53302 : 8217014: Epsilon should not ignore Metadata GC causes
Reviewed-by: stuefe
@@ -159,16 +159,12 @@
// ...and print the occupancy line, if needed
{
size_t last = _last_heap_print;
if ((used - last >= _step_heap_print) && Atomic::cmpxchg(used, &_last_heap_print, last) == last) {
- log_info(gc)("Heap: " SIZE_FORMAT "M reserved, " SIZE_FORMAT "M (%.2f%%) committed, " SIZE_FORMAT "M (%.2f%%) used",
- max_capacity() / M,
- capacity() / M,
- capacity() * 100.0 / max_capacity(),
- used / M,
- used * 100.0 / max_capacity());
+ print_heap_info(used);
+ print_metaspace_info();
}
}
assert(is_object_aligned(res), "Object should be aligned: " PTR_FORMAT, p2i(res));
return res;
@@ -266,17 +262,30 @@
*gc_overhead_limit_was_exceeded = false;
return allocate_work(size);
}
void EpsilonHeap::collect(GCCause::Cause cause) {
+ switch (cause) {
+ case GCCause::_metadata_GC_threshold:
+ case GCCause::_metadata_GC_clear_soft_refs:
+ // Receiving these causes means the VM itself entered the safepoint for metadata collection.
+ // While Epsilon does not do GC, it has to perform sizing adjustments, otherwise we would
+ // re-enter the safepoint again very soon.
+
+ assert(SafepointSynchronize::is_at_safepoint(), "Expected at safepoint");
+ log_info(gc)("GC request for \"%s\" is handled", GCCause::to_string(cause));
+ MetaspaceGC::compute_new_size();
+ print_metaspace_info();
+ break;
+ default:
log_info(gc)("GC request for \"%s\" is ignored", GCCause::to_string(cause));
+ }
_monitoring_support->update_counters();
}
void EpsilonHeap::do_full_collection(bool clear_all_soft_refs) {
- log_info(gc)("Full GC request for \"%s\" is ignored", GCCause::to_string(gc_cause()));
- _monitoring_support->update_counters();
+ collect(gc_cause());
}
void EpsilonHeap::safe_object_iterate(ObjectClosure *cl) {
_space->safe_object_iterate(cl);
}
@@ -287,15 +296,46 @@
// Cast away constness:
((VirtualSpace)_virtual_space).print_on(st);
st->print_cr("Allocation space:");
_space->print_on(st);
+
+ MetaspaceUtils::print_on(st);
}
void EpsilonHeap::print_tracing_info() const {
- Log(gc) log;
- size_t allocated_kb = used() / K;
- log.info("Total allocated: " SIZE_FORMAT " KB",
- allocated_kb);
- log.info("Average allocation rate: " SIZE_FORMAT " KB/sec",
- (size_t)(allocated_kb * NANOSECS_PER_SEC / os::elapsed_counter()));
+ print_heap_info(used());
+ print_metaspace_info();
+}
+
+void EpsilonHeap::print_heap_info(size_t used) const {
+ size_t reserved = max_capacity();
+ size_t committed = capacity();
+
+ if (reserved != 0) {
+ log_info(gc)("Heap: " SIZE_FORMAT "M reserved, " SIZE_FORMAT "M (%.2f%%) committed, " SIZE_FORMAT "M (%.2f%%) used",
+ reserved / M,
+ committed / M,
+ committed * 100.0 / reserved,
+ used / M,
+ used * 100.0 / reserved);
+ } else {
+ log_info(gc)("Heap: no reliable data");
+ }
+}
+
+void EpsilonHeap::print_metaspace_info() const {
+ size_t reserved = MetaspaceUtils::reserved_bytes();
+ size_t committed = MetaspaceUtils::committed_bytes();
+ size_t used = MetaspaceUtils::used_bytes();
+
+ if (reserved != 0) {
+ log_info(gc, metaspace)("Metaspace: " SIZE_FORMAT "M reserved, " SIZE_FORMAT "M (%.2f%%) committed, " SIZE_FORMAT "M (%.2f%%) used",
+ reserved / M,
+ committed / M,
+ committed * 100.0 / reserved,
+ used / M,
+ used * 100.0 / reserved);
+ } else {
+ log_info(gc, metaspace)("Metaspace: no reliable data");
+ }
}
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