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8027423: Parallel compact GC class unloading measurement includes symbol and string table time

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Reviewed-by: mgerdin, jmasa
This commit is contained in:
Stefan Karlsson 2016-03-17 21:01:59 +01:00
parent 7c87080ac1
commit 35058d4038
5 changed files with 83 additions and 45 deletions
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33
hotspot/src/share/vm/gc/parallel/psParallelCompact.cpp
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@ -2103,25 +2103,34 @@ void PSParallelCompact::marking_phase(ParCompactionManager* cm,
gc_tracer->report_gc_reference_stats(stats);
}
GCTraceTime(Trace, gc) tm_m("Class Unloading", &_gc_timer);
// This is the point where the entire marking should have completed.
assert(cm->marking_stacks_empty(), "Marking should have completed");
// Follow system dictionary roots and unload classes.
bool purged_class = SystemDictionary::do_unloading(is_alive_closure());
{
GCTraceTime(Debug, gc) tm_m("Class Unloading", &_gc_timer);
// Unload nmethods.
CodeCache::do_unloading(is_alive_closure(), purged_class);
// Follow system dictionary roots and unload classes.
bool purged_class = SystemDictionary::do_unloading(is_alive_closure());
// Prune dead klasses from subklass/sibling/implementor lists.
Klass::clean_weak_klass_links(is_alive_closure());
// Unload nmethods.
CodeCache::do_unloading(is_alive_closure(), purged_class);
// Delete entries for dead interned strings.
StringTable::unlink(is_alive_closure());
// Prune dead klasses from subklass/sibling/implementor lists.
Klass::clean_weak_klass_links(is_alive_closure());
}
{
GCTraceTime(Debug, gc) t("Scrub String Table", &_gc_timer);
// Delete entries for dead interned strings.
StringTable::unlink(is_alive_closure());
}
{
GCTraceTime(Debug, gc) t("Scrub Symbol Table", &_gc_timer);
// Clean up unreferenced symbols in symbol table.
SymbolTable::unlink();
}
// Clean up unreferenced symbols in symbol table.
SymbolTable::unlink();
_gc_tracer.report_object_count_after_gc(is_alive_closure());
}