src/share/vm/memory/metaspaceTracer.cpp

rev 6070 : 8036699: Add trace event when a metaspace allocation fails

@@ -21,13 +21,19 @@
  * questions.
  *
  */
 
 #include "precompiled.hpp"
+#include "classfile/classLoaderData.hpp"
 #include "memory/metaspaceTracer.hpp"
+#include "runtime/frame.hpp"
+#include "runtime/os.hpp"
+#include "runtime/thread.inline.hpp"
 #include "trace/tracing.hpp"
 #include "trace/traceBackend.hpp"
+#include "utilities/decoder.hpp"
+#include "utilities/ostream.hpp"
 
 void MetaspaceTracer::report_gc_threshold(size_t old_val,
                                           size_t new_val,
                                           MetaspaceGCThresholdUpdater::Type updater) const {
   EventMetaspaceGCThreshold event;

@@ -36,5 +42,79 @@
     event.set_newValue(new_val);
     event.set_updater((u1)updater);
     event.commit();
   }
 }
+
+static bool get_method_name(address pc, char *buf, size_t buflen) {
+  if (os::address_is_in_vm(pc) && Decoder::can_decode_C_frame_in_vm()) {
+    return os::dll_address_to_function_name(pc, buf, (int) buflen, 0);
+  }
+  return false;
+}
+
+static bool is_valid_frame_in_vm(const frame* f) {
+  return f->pc() && os::address_is_in_vm(f->pc()) && !f->is_java_frame();
+}
+
+static void write_vm_stack_trace(outputStream *stream) {
+  const size_t max_num_frames = 64;
+  size_t num_frames = 0;
+
+  const size_t buflen = 256;
+  char *buf = NEW_RESOURCE_ARRAY(char, buflen);
+
+  Thread* current_thread = Thread::current();
+  frame fr = os::current_frame();
+  while (is_valid_frame_in_vm(&fr) && num_frames < max_num_frames) {
+    if (get_method_name(fr.pc(), buf, buflen)) {
+      stream->print_cr("%s", buf);
+    } else {
+      stream->print_cr(PTR_FORMAT, fr.pc());
+    }
+
+    // Check if it safe to get the caller's stack frame.
+    if (fr.safe_for_sender(current_thread)) {
+      fr = os::get_sender_for_C_frame(&fr);
+    } else {
+      // Not safe to traverse the stack any further.
+      return;
+    }
+
+    num_frames++;
+  }
+}
+
+void MetaspaceTracer::report_metaspace_allocation_failure(ClassLoaderData *cld,
+                                                          size_t word_size,
+                                                          MetaspaceObj::Type objtype,
+                                                          Metaspace::MetadataType mdtype) const {
+  EventMetaspaceAllocationFailure event;
+  if (event.should_commit()) {
+    if (cld->is_anonymous()) {
+      event.set_classLoader(NULL);
+      event.set_anonymousClassLoader(true);
+    } else {
+      if (cld->is_the_null_class_loader_data()) {
+        event.set_classLoader((Klass*) NULL);
+      } else {
+        event.set_classLoader(cld->class_loader()->klass());
+      }
+      event.set_anonymousClassLoader(false);
+    }
+
+#ifdef _WINDOWS
+    // Can not walk the stack on Windows using the frame pointer.
+    event.set_nativeStackTrace(NULL);
+#else
+    ResourceMark rm;
+    stringStream stack_trace;
+    write_vm_stack_trace(&stack_trace);
+    event.set_nativeStackTrace(stack_trace.as_string());
+#endif
+
+    event.set_size(word_size * BytesPerWord);
+    event.set_metadataType((u1) mdtype);
+    event.set_metaspaceObjectType((u1) objtype);
+    event.commit();
+  }
+}