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<p class="MsoNormal"><span style="color:#1F497D">Just a reminder…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Can someone please review this?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Alok<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> hotspot-gc-dev [mailto:hotspot-gc-dev-bounces@openjdk.java.net]
<b>On Behalf Of </b>Sharma, Alok Kumar (OSTL)<br>
<b>Sent:</b> Monday, September 19, 2016 1:46 PM<br>
<b>To:</b> hotspot-gc-dev@openjdk.java.net<br>
<b>Subject:</b> SerialGC: Tracing of object movement during SerialGC<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoPlainText">As part of the work on a particular bug, we felt a need for tracing logs in Hotspot serial GC to observe Java object movement. As a result, the serial GC tracing logs were enhanced to provide information about when:<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText" style="margin-left:27.0pt;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Objects are marked<o:p></o:p></p>
<p class="MsoPlainText" style="margin-left:27.0pt;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Pointers pointing to these objects are adjusted<o:p></o:p></p>
<p class="MsoPlainText" style="margin-left:27.0pt;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Moving of objects<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Usage: <o:p></o:p></p>
<p class="MsoPlainText">jdk9/build/linux-x86_64-rmal-server-slowdebug/jdk/bin/java -Xlog:gc+dump=trace -XX:+UseSerialGC -Xmx4m -XX:GCTraceFunctionFilter="java/lang/String" <test><o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Regards,<o:p></o:p></p>
<p class="MsoPlainText">Alok<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Below is the mercurial diff with openJDK 9<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">hg diff jdk9b132_4Aug2016/hotspot/src/<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">diff -r a3a3621d555a src/share/vm/gc/serial/defNewGeneration.cpp<o:p></o:p></p>
<p class="MsoPlainText">--- a/src/share/vm/gc/serial/defNewGeneration.cpp Thu Aug 04 17:32:52 2016 +0000<o:p></o:p></p>
<p class="MsoPlainText">+++ b/src/share/vm/gc/serial/defNewGeneration.cpp Mon Sep 19 11:28:49 2016 +0530<o:p></o:p></p>
<p class="MsoPlainText">@@ -762,6 +762,8 @@<o:p></o:p></p>
<p class="MsoPlainText"> }<o:p></o:p></p>
<p class="MsoPlainText">}<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">+extern Symbol *serial_class_trace_name;<o:p></o:p></p>
<p class="MsoPlainText">+<o:p></o:p></p>
<p class="MsoPlainText">oop DefNewGeneration::copy_to_survivor_space(oop old) {<o:p></o:p></p>
<p class="MsoPlainText"> assert(is_in_reserved(old) && !old->is_forwarded(),<o:p></o:p></p>
<p class="MsoPlainText"> "shouldn't be scavenging this oop"); @@ -793,6 +795,20 @@<o:p></o:p></p>
<p class="MsoPlainText"> age_table()->add(obj, s);<o:p></o:p></p>
<p class="MsoPlainText"> }<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">+ if(log_develop_is_enabled(Trace, gc, dump)) {<o:p></o:p></p>
<p class="MsoPlainText">+ Klass *klass = obj->klass();<o:p></o:p></p>
<p class="MsoPlainText">+ if(klass) {<o:p></o:p></p>
<p class="MsoPlainText">+ Symbol *name = klass->name();<o:p></o:p></p>
<p class="MsoPlainText">+ if((GCTraceOnlyClass == NULL) ||<o:p></o:p></p>
<p class="MsoPlainText">+ (name && (serial_class_trace_name == name))) {<o:p></o:p></p>
<p class="MsoPlainText">+<o:p></o:p></p>
<p class="MsoPlainText">+ log_develop_trace(gc, dump)("copy_to_survivor_space old %p new %p ",old, obj);<o:p></o:p></p>
<p class="MsoPlainText">+ log_develop_trace(gc, dump)("obj name %s \n", name->as_C_string());<o:p></o:p></p>
<p class="MsoPlainText">+ }<o:p></o:p></p>
<p class="MsoPlainText">+ }<o:p></o:p></p>
<p class="MsoPlainText">+ }<o:p></o:p></p>
<p class="MsoPlainText">+<o:p></o:p></p>
<p class="MsoPlainText">+<o:p></o:p></p>
<p class="MsoPlainText"> // Done, insert forward pointer to obj in this header<o:p></o:p></p>
<p class="MsoPlainText"> old->forward_to(obj);<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">diff -r a3a3621d555a src/share/vm/gc/serial/markSweep.cpp<o:p></o:p></p>
<p class="MsoPlainText">--- a/src/share/vm/gc/serial/markSweep.cpp Thu Aug 04 17:32:52 2016 +0000<o:p></o:p></p>
<p class="MsoPlainText">+++ b/src/share/vm/gc/serial/markSweep.cpp Mon Sep 19 11:28:49 2016 +0530<o:p></o:p></p>
<p class="MsoPlainText">@@ -64,6 +64,14 @@<o:p></o:p></p>
<p class="MsoPlainText">CLDToOopClosure MarkSweep::follow_cld_closure(&mark_and_push_closure);<o:p></o:p></p>
<p class="MsoPlainText">CLDToOopClosure MarkSweep::adjust_cld_closure(&adjust_pointer_closure);<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">+Symbol *serial_class_trace_name = NULL;<o:p></o:p></p>
<p class="MsoPlainText">+<o:p></o:p></p>
<p class="MsoPlainText">+void<o:p></o:p></p>
<p class="MsoPlainText">+SetTraceSymbol(const char *trace_name) {<o:p></o:p></p>
<p class="MsoPlainText">+ Thread* __the_thread__ = Thread::current_or_null();<o:p></o:p></p>
<p class="MsoPlainText">+ serial_class_trace_name = SymbolTable::new_symbol(trace_name,
<o:p></o:p></p>
<p class="MsoPlainText">+strlen(trace_name), CHECK); }<o:p></o:p></p>
<p class="MsoPlainText">+<o:p></o:p></p>
<p class="MsoPlainText">inline void MarkSweep::mark_object(oop obj) { #if INCLUDE_ALL_GCS<o:p></o:p></p>
<p class="MsoPlainText"> if (G1StringDedup::is_enabled()) {<o:p></o:p></p>
<p class="MsoPlainText">@@ -77,6 +85,21 @@<o:p></o:p></p>
<p class="MsoPlainText"> markOop mark = obj->mark();<o:p></o:p></p>
<p class="MsoPlainText"> obj->set_mark(markOopDesc::prototype()->set_marked());<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">+ if(log_develop_is_enabled(Trace, gc, dump)) {<o:p></o:p></p>
<p class="MsoPlainText">+ Klass *klass = obj->klass();<o:p></o:p></p>
<p class="MsoPlainText">+<o:p></o:p></p>
<p class="MsoPlainText">+ if(klass) {<o:p></o:p></p>
<p class="MsoPlainText">+ Symbol *name = klass->name();<o:p></o:p></p>
<p class="MsoPlainText">+ if(name) {<o:p></o:p></p>
<p class="MsoPlainText">+ if((GCTraceOnlyClass == NULL) ||<o:p></o:p></p>
<p class="MsoPlainText">+ strstr(strName, GCTraceOnlyClass)) {<o:p></o:p></p>
<p class="MsoPlainText">+ log_develop_trace(gc, dump) ("Mark object obj %p obj class name %s", obj, name->as_C_string());<o:p></o:p></p>
<p class="MsoPlainText">+ }<o:p></o:p></p>
<p class="MsoPlainText">+ }<o:p></o:p></p>
<p class="MsoPlainText">+ }<o:p></o:p></p>
<p class="MsoPlainText">+<o:p></o:p></p>
<p class="MsoPlainText">+ }<o:p></o:p></p>
<p class="MsoPlainText">+<o:p></o:p></p>
<p class="MsoPlainText"> if (mark->must_be_preserved(obj)) {<o:p></o:p></p>
<p class="MsoPlainText"> preserve_mark(obj, mark);<o:p></o:p></p>
<p class="MsoPlainText"> }<o:p></o:p></p>
<p class="MsoPlainText">diff -r a3a3621d555a src/share/vm/gc/serial/markSweep.inline.hpp<o:p></o:p></p>
<p class="MsoPlainText">--- a/src/share/vm/gc/serial/markSweep.inline.hpp Thu Aug 04 17:32:52 2016 +0000<o:p></o:p></p>
<p class="MsoPlainText">+++ b/src/share/vm/gc/serial/markSweep.inline.hpp Mon Sep 19 11:28:49 2016 +0530<o:p></o:p></p>
<p class="MsoPlainText">@@ -46,6 +46,8 @@<o:p></o:p></p>
<p class="MsoPlainText"> return obj->ms_adjust_pointers();<o:p></o:p></p>
<p class="MsoPlainText">}<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">+extern Symbol *serial_class_trace_name;<o:p></o:p></p>
<p class="MsoPlainText">+<o:p></o:p></p>
<p class="MsoPlainText">template <class T> inline void MarkSweep::adjust_pointer(T* p) {<o:p></o:p></p>
<p class="MsoPlainText"> T heap_oop = oopDesc::load_heap_oop(p);<o:p></o:p></p>
<p class="MsoPlainText"> if (!oopDesc::is_null(heap_oop)) {<o:p></o:p></p>
<p class="MsoPlainText">@@ -66,7 +68,22 @@<o:p></o:p></p>
<p class="MsoPlainText"> oopDesc::encode_store_heap_oop_not_null(p, new_obj);<o:p></o:p></p>
<p class="MsoPlainText"> }<o:p></o:p></p>
<p class="MsoPlainText"> }<o:p></o:p></p>
<p class="MsoPlainText">+<o:p></o:p></p>
<p class="MsoPlainText">+ if(log_develop_is_enabled(Trace, gc, dump)) {<o:p></o:p></p>
<p class="MsoPlainText">+ Klass *klass = obj->klass();<o:p></o:p></p>
<p class="MsoPlainText">+<o:p></o:p></p>
<p class="MsoPlainText">+ if(klass) {<o:p></o:p></p>
<p class="MsoPlainText">+ Symbol *name = klass->name();<o:p></o:p></p>
<p class="MsoPlainText">+ if((GCTraceOnlyClass == NULL) || <o:p></o:p></p>
<p class="MsoPlainText">+ (name && (serial_class_trace_name == name))) {<o:p></o:p></p>
<p class="MsoPlainText">+ log_develop_trace(gc, dump)("adjust_pointer ptr %p obj class name %s obj %p new_obj %p \n", p, name->as_C_string(), obj, new_obj);<o:p></o:p></p>
<p class="MsoPlainText">+ } else {<o:p></o:p></p>
<p class="MsoPlainText">+ log_develop_trace(gc, dump)("adjust_pointer Corrupted klass? name probably not correct # obj %p klass %p name %p \n",obj, klass, name);<o:p></o:p></p>
<p class="MsoPlainText">+ }<o:p></o:p></p>
<p class="MsoPlainText">+ }<o:p></o:p></p>
<p class="MsoPlainText">+ }<o:p></o:p></p>
<p class="MsoPlainText"> }<o:p></o:p></p>
<p class="MsoPlainText">+<o:p></o:p></p>
<p class="MsoPlainText">}<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">#endif // SHARE_VM_GC_SERIAL_MARKSWEEP_INLINE_HPP<o:p></o:p></p>
<p class="MsoPlainText">diff -r a3a3621d555a src/share/vm/gc/shared/genOopClosures.inline.hpp<o:p></o:p></p>
<p class="MsoPlainText">--- a/src/share/vm/gc/shared/genOopClosures.inline.hpp Thu Aug 04 17:32:52 2016 +0000<o:p></o:p></p>
<p class="MsoPlainText">+++ b/src/share/vm/gc/shared/genOopClosures.inline.hpp Mon Sep 19 11:28:49 2016 +0530<o:p></o:p></p>
<p class="MsoPlainText">@@ -99,6 +99,8 @@<o:p></o:p></p>
<p class="MsoPlainText">inline void ScanClosure::do_oop_nv(oop* p) { ScanClosure::do_oop_work(p); }<o:p></o:p></p>
<p class="MsoPlainText">inline void ScanClosure::do_oop_nv(narrowOop* p) { ScanClosure::do_oop_work(p); }<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">+extern Symbol *serial_class_trace_name;<o:p></o:p></p>
<p class="MsoPlainText">+<o:p></o:p></p>
<p class="MsoPlainText">// NOTE! Any changes made here should also be made // in ScanClosure::do_oop_work() template <class T> inline void FastScanClosure::do_oop_work(T* p) { @@ -111,6 +113,18 @@<o:p></o:p></p>
<p class="MsoPlainText"> oop new_obj = obj->is_forwarded() ? obj->forwardee()<o:p></o:p></p>
<p class="MsoPlainText"> : _g->copy_to_survivor_space(obj);<o:p></o:p></p>
<p class="MsoPlainText"> oopDesc::encode_store_heap_oop_not_null(p, new_obj);<o:p></o:p></p>
<p class="MsoPlainText">+ if(log_develop_is_enabled(Trace, gc, dump)) {<o:p></o:p></p>
<p class="MsoPlainText">+ Klass *klass = obj->klass();<o:p></o:p></p>
<p class="MsoPlainText">+ if(klass) {<o:p></o:p></p>
<p class="MsoPlainText">+ Symbol *name = klass->name();<o:p></o:p></p>
<p class="MsoPlainText">+ if((GCTraceOnlyClass == NULL) || <o:p></o:p></p>
<p class="MsoPlainText">+ (name && (serial_class_trace_name == name))) {<o:p></o:p></p>
<p class="MsoPlainText">+ log_develop_trace(gc, dump)("FastScanClosure Updating pointer p %p old %p new %p ",p, obj, new_obj);<o:p></o:p></p>
<p class="MsoPlainText">+ log_develop_trace(gc, dump)("obj name %s \n", name->as_C_string() );<o:p></o:p></p>
<p class="MsoPlainText">+ }<o:p></o:p></p>
<p class="MsoPlainText">+ }<o:p></o:p></p>
<p class="MsoPlainText">+ }<o:p></o:p></p>
<p class="MsoPlainText">+<o:p></o:p></p>
<p class="MsoPlainText"> if (is_scanning_a_klass()) {<o:p></o:p></p>
<p class="MsoPlainText"> do_klass_barrier();<o:p></o:p></p>
<p class="MsoPlainText"> } else if (_gc_barrier) {<o:p></o:p></p>
<p class="MsoPlainText">diff -r a3a3621d555a src/share/vm/runtime/arguments.cpp<o:p></o:p></p>
<p class="MsoPlainText">--- a/src/share/vm/runtime/arguments.cpp Thu Aug 04 17:32:52 2016 +0000<o:p></o:p></p>
<p class="MsoPlainText">+++ b/src/share/vm/runtime/arguments.cpp Mon Sep 19 11:28:49 2016 +0530<o:p></o:p></p>
<p class="MsoPlainText">@@ -1949,6 +1949,8 @@<o:p></o:p></p>
<p class="MsoPlainText"> log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); }<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">+extern void SetTraceSymbol(const char *);<o:p></o:p></p>
<p class="MsoPlainText">+<o:p></o:p></p>
<p class="MsoPlainText">void Arguments::set_gc_specific_flags() { #if INCLUDE_ALL_GCS<o:p></o:p></p>
<p class="MsoPlainText"> // Set per-collector flags<o:p></o:p></p>
<p class="MsoPlainText">@@ -1973,6 +1975,12 @@<o:p></o:p></p>
<p class="MsoPlainText">#endif // INCLUDE_ALL_GCS<o:p></o:p></p>
<p class="MsoPlainText">}<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">+void Arguments::set_gc_specific_flags_after_globals() {<o:p></o:p></p>
<p class="MsoPlainText">+ if(GCTraceOnlyClass != NULL) {<o:p></o:p></p>
<p class="MsoPlainText">+ SetTraceSymbol(GCTraceOnlyClass);<o:p></o:p></p>
<p class="MsoPlainText">+ }<o:p></o:p></p>
<p class="MsoPlainText">+}<o:p></o:p></p>
<p class="MsoPlainText">+<o:p></o:p></p>
<p class="MsoPlainText">julong Arguments::limit_by_allocatable_memory(julong limit) {<o:p></o:p></p>
<p class="MsoPlainText"> julong max_allocatable;<o:p></o:p></p>
<p class="MsoPlainText"> julong result = limit;<o:p></o:p></p>
<p class="MsoPlainText">diff -r a3a3621d555a src/share/vm/runtime/arguments.hpp<o:p></o:p></p>
<p class="MsoPlainText">--- a/src/share/vm/runtime/arguments.hpp Thu Aug 04 17:32:52 2016 +0000<o:p></o:p></p>
<p class="MsoPlainText">+++ b/src/share/vm/runtime/arguments.hpp Mon Sep 19 11:28:49 2016 +0530<o:p></o:p></p>
<p class="MsoPlainText">@@ -603,6 +603,7 @@<o:p></o:p></p>
<p class="MsoPlainText"> static jint adjust_after_os();<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"> static void set_gc_specific_flags();<o:p></o:p></p>
<p class="MsoPlainText">+ static void set_gc_specific_flags_after_globals();<o:p></o:p></p>
<p class="MsoPlainText"> static bool gc_selected(); // whether a gc has been selected<o:p></o:p></p>
<p class="MsoPlainText"> static void select_gc_ergonomically(); #if INCLUDE_JVMCI diff -r a3a3621d555a src/share/vm/runtime/globals.hpp<o:p></o:p></p>
<p class="MsoPlainText">--- a/src/share/vm/runtime/globals.hpp Thu Aug 04 17:32:52 2016 +0000<o:p></o:p></p>
<p class="MsoPlainText">+++ b/src/share/vm/runtime/globals.hpp Mon Sep 19 11:28:49 2016 +0530<o:p></o:p></p>
<p class="MsoPlainText">@@ -1616,6 +1616,11 @@<o:p></o:p></p>
<p class="MsoPlainText"> "blocked by the GC locker") \<o:p></o:p></p>
<p class="MsoPlainText"> range(0, max_uintx) \<o:p></o:p></p>
<p class="MsoPlainText"> \<o:p></o:p></p>
<p class="MsoPlainText">+ product(ccstr, GCTraceOnlyClass, NULL, \<o:p></o:p></p>
<p class="MsoPlainText">+ "Function name on which the GC internal tracing is done. Default" \<o:p></o:p></p>
<p class="MsoPlainText">+ "is to be empty and print GC tracing for all functions. " \<o:p></o:p></p>
<p class="MsoPlainText">+ ) \<o:p></o:p></p>
<p class="MsoPlainText">+
<o:p></o:p></p>
<p class="MsoPlainText">+ \<o:p></o:p></p>
<p class="MsoPlainText"> product(bool, UseCMSBestFit, true, \<o:p></o:p></p>
<p class="MsoPlainText"> "Use CMS best fit allocation strategy") \<o:p></o:p></p>
<p class="MsoPlainText"> \ diff -r a3a3621d555a src/share/vm/runtime/thread.cpp<o:p></o:p></p>
<p class="MsoPlainText">--- a/src/share/vm/runtime/thread.cpp Thu Aug 04 17:32:52 2016 +0000<o:p></o:p></p>
<p class="MsoPlainText">+++ b/src/share/vm/runtime/thread.cpp Mon Sep 19 11:28:49 2016 +0530<o:p></o:p></p>
<p class="MsoPlainText">@@ -3626,6 +3626,8 @@<o:p></o:p></p>
<p class="MsoPlainText"> return status;<o:p></o:p></p>
<p class="MsoPlainText"> }<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">+ Arguments::set_gc_specific_flags_after_globals();<o:p></o:p></p>
<p class="MsoPlainText">+<o:p></o:p></p>
<p class="MsoPlainText"> if (TRACE_INITIALIZE() != JNI_OK) {<o:p></o:p></p>
<p class="MsoPlainText"> vm_exit_during_initialization("Failed to initialize tracing backend");<o:p></o:p></p>
<p class="MsoPlainText"> }<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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