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6857194: Add hotspot perf counters to aid class loading performance measurement

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Add new jvmstat counters to measure detailed class loading time

Reviewed-by: acorn, kamg
This commit is contained in:
Mandy Chung 2009-07-10 11:10:00 -07:00
parent c8140c1078
commit 08f5aeffc1
11 changed files with 274 additions and 33 deletions
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17
hotspot/src/share/vm/classfile/systemDictionary.cpp
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@ -1306,13 +1306,18 @@ static instanceKlassHandle download_and_retry_class_load(
instanceKlassHandle SystemDictionary::load_instance_class(symbolHandle class_name, Handle class_loader, TRAPS) {
instanceKlassHandle nh = instanceKlassHandle(); // null Handle
if (class_loader.is_null()) {
// Search the shared system dictionary for classes preloaded into the
// shared spaces.
instanceKlassHandle k;
k = load_shared_class(class_name, class_loader, THREAD);
{
PerfTraceTime vmtimer(ClassLoader::perf_shared_classload_time());
k = load_shared_class(class_name, class_loader, THREAD);
}
if (k.is_null()) {
// Use VM class loader
PerfTraceTime vmtimer(ClassLoader::perf_sys_classload_time());
k = ClassLoader::load_classfile(class_name, CHECK_(nh));
}
@ -1334,6 +1339,16 @@ instanceKlassHandle SystemDictionary::load_instance_class(symbolHandle class_nam
// Use user specified class loader to load class. Call loadClass operation on class_loader.
ResourceMark rm(THREAD);
assert(THREAD->is_Java_thread(), "must be a JavaThread");
JavaThread* jt = (JavaThread*) THREAD;
PerfClassTraceTime vmtimer(ClassLoader::perf_app_classload_time(),
ClassLoader::perf_app_classload_selftime(),
ClassLoader::perf_app_classload_count(),
jt->get_thread_stat()->perf_recursion_counts_addr(),
jt->get_thread_stat()->perf_timers_addr(),
PerfClassTraceTime::CLASS_LOAD);
Handle s = java_lang_String::create_from_symbol(class_name, CHECK_(nh));
// Translate to external class name format, i.e., convert '/' chars to '.'
Handle string = java_lang_String::externalize_classname(s, CHECK_(nh));