jdk8-mips64-public/hotspot: src/share/vm/jfr/writers/jfrJavaEventWriter.cpp@b985cbb00e68 (annotated)

src/share/vm/jfr/writers/jfrJavaEventWriter.cpp@b985cbb00e68 (annotated)

src/share/vm/jfr/writers/jfrJavaEventWriter.cpp

Mon, 12 Aug 2019 18:30:40 +0300

author: apetushkov
date: Mon, 12 Aug 2019 18:30:40 +0300
changeset 9858: b985cbb00e68
child 9884: 1258121876f8
permissions: -rw-r--r--

8223147: JFR Backport
8199712: Flight Recorder
8203346: JFR: Inconsistent signature of jfr_add_string_constant
8195817: JFR.stop should require name of recording
8195818: JFR.start should increase autogenerated name by one
8195819: Remove recording=x from jcmd JFR.check output
8203921: JFR thread sampling is missing fixes from JDK-8194552
8203929: Limit amount of data for JFR.dump
8203664: JFR start failure after AppCDS archive created with JFR StartFlightRecording
8003209: JFR events for network utilization
8207392: [PPC64] Implement JFR profiling
8202835: jfr/event/os/TestSystemProcess.java fails on missing events
Summary: Backport JFR from JDK11. Initial integration
Reviewed-by: neugens

 /*
  * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "jni.h"
 #include "classfile/symbolTable.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "classfile/vmSymbols.hpp"
 #include "jfr/jni/jfrJavaSupport.hpp"
 #include "jfr/recorder/storage/jfrStorage.hpp"
 #include "jfr/support/jfrThreadId.hpp"
 #include "jfr/utilities/jfrTypes.hpp"
 #include "jfr/writers/jfrJavaEventWriter.hpp"
 #include "oops/instanceKlass.hpp"
 #include "oops/oop.inline.hpp"
 #include "runtime/fieldDescriptor.hpp"
 #include "runtime/handles.hpp"
 #include "runtime/jniHandles.hpp"
 #include "runtime/thread.inline.hpp"
 static int start_pos_offset = invalid_offset;
 static int start_pos_address_offset = invalid_offset;
 static int current_pos_offset = invalid_offset;
 static int max_pos_offset = invalid_offset;
 static int max_event_size_offset = invalid_offset;
 static int notified_offset = invalid_offset;
 static int thread_id_offset = invalid_offset;
 static int valid_offset = invalid_offset;
 static bool find_field(InstanceKlass* ik,
                        Symbol* name_symbol,
                        Symbol* signature_symbol,
                        fieldDescriptor* fd,
                        bool is_static = false,
                        bool allow_super = false) {
   if (allow_super || is_static) {
     return ik->find_field(name_symbol, signature_symbol, is_static, fd) != NULL;
   } else {
     return ik->find_local_field(name_symbol, signature_symbol, fd);
   }
 }
 static void compute_offset(int &dest_offset,
                            Klass* klass,
                            Symbol* name_symbol,
                            Symbol* signature_symbol,
                            bool is_static = false, bool allow_super = false) {
   fieldDescriptor fd;
   InstanceKlass* ik = InstanceKlass::cast(klass);
   if (!find_field(ik, name_symbol, signature_symbol, &fd, is_static, allow_super)) {
     assert(false, "invariant");
   }
   dest_offset = fd.offset();
 }
 static bool setup_event_writer_offsets(TRAPS) {
   const char class_name[] = "jdk/jfr/internal/EventWriter";
   Symbol* const k_sym = SymbolTable::lookup(class_name, sizeof class_name - 1, CHECK_false);
   assert(k_sym != NULL, "invariant");
   Klass* klass = SystemDictionary::resolve_or_fail(k_sym, true, CHECK_false);
   assert(klass != NULL, "invariant");
   const char start_pos_name[] = "startPosition";
   Symbol* const start_pos_sym = SymbolTable::lookup(start_pos_name, sizeof start_pos_name - 1, CHECK_false);
   assert(start_pos_sym != NULL, "invariant");
   assert(invalid_offset == start_pos_offset, "invariant");
   compute_offset(start_pos_offset, klass, start_pos_sym, vmSymbols::long_signature());
   assert(start_pos_offset != invalid_offset, "invariant");
   const char start_pos_address_name[] = "startPositionAddress";
   Symbol* const start_pos_address_sym = SymbolTable::lookup(start_pos_address_name, sizeof start_pos_address_name - 1, CHECK_false);
   assert(start_pos_address_sym != NULL, "invariant");
   assert(invalid_offset == start_pos_address_offset, "invariant");
   compute_offset(start_pos_address_offset, klass, start_pos_address_sym, vmSymbols::long_signature());
   assert(start_pos_address_offset != invalid_offset, "invariant");
   const char event_pos_name[] = "currentPosition";
   Symbol* const event_pos_sym = SymbolTable::lookup(event_pos_name, sizeof event_pos_name - 1, CHECK_false);
   assert(event_pos_sym != NULL, "invariant");
   assert(invalid_offset == current_pos_offset, "invariant");
   compute_offset(current_pos_offset, klass, event_pos_sym,vmSymbols::long_signature());
   assert(current_pos_offset != invalid_offset, "invariant");
   const char max_pos_name[] = "maxPosition";
   Symbol* const max_pos_sym = SymbolTable::lookup(max_pos_name, sizeof max_pos_name - 1, CHECK_false);
   assert(max_pos_sym != NULL, "invariant");
   assert(invalid_offset == max_pos_offset, "invariant");
   compute_offset(max_pos_offset, klass, max_pos_sym, vmSymbols::long_signature());
   assert(max_pos_offset != invalid_offset, "invariant");
   const char max_event_size_name[] = "maxEventSize";
   Symbol* const max_event_size_sym = SymbolTable::lookup(max_event_size_name, sizeof max_event_size_name - 1, CHECK_false);
   assert (max_event_size_sym != NULL, "invariant");
   assert(invalid_offset == max_event_size_offset, "invariant");
   compute_offset(max_event_size_offset, klass, max_event_size_sym, vmSymbols::int_signature());
   assert(max_event_size_offset != invalid_offset, "invariant");
   const char notified_name[] = "notified";
   Symbol* const notified_sym = SymbolTable::lookup(notified_name, sizeof notified_name - 1, CHECK_false);
   assert (notified_sym != NULL, "invariant");
   assert(invalid_offset == notified_offset, "invariant");
   compute_offset(notified_offset, klass, notified_sym, vmSymbols::bool_signature());
   assert(notified_offset != invalid_offset, "invariant");
   const char valid_name[] = "valid";
   Symbol* const valid_sym = SymbolTable::lookup(valid_name, sizeof valid_name - 1, CHECK_false);
   assert (valid_sym != NULL, "invariant");
   assert(invalid_offset == valid_offset, "invariant");
   compute_offset(valid_offset, klass, valid_sym, vmSymbols::bool_signature());
   assert(valid_offset != invalid_offset, "invariant");
   return true;
 }
 bool JfrJavaEventWriter::has_required_classes(TRAPS) {
   const char class_name[] = "jdk/jfr/internal/EventWriter";
   Symbol* const k_sym = SymbolTable::lookup(class_name, sizeof class_name - 1, CHECK_false);
   Klass* klass = SystemDictionary::resolve_or_null(k_sym, CHECK_false);
   return (klass != NULL);
 }
 bool JfrJavaEventWriter::initialize() {
   static bool initialized = false;
   if (!initialized) {
     Thread* thread = Thread::current();
     initialized = setup_event_writer_offsets(thread);
   }
   return initialized;
 }
 jboolean JfrJavaEventWriter::flush(jobject writer, jint used, jint requested, JavaThread* jt) {
   DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(jt));
   assert(writer != NULL, "invariant");
   oop const w = JNIHandles::resolve_non_null(writer);
   assert(w != NULL, "invariant");
   JfrBuffer* const current = jt->jfr_thread_local()->java_buffer();
   assert(current != NULL, "invariant");
   JfrBuffer* const buffer = JfrStorage::flush(current, used, requested, false, jt);
   assert(buffer != NULL, "invariant");
   // "validity" is contextually defined here to mean
   // that some memory location was provided that is
   // large enough to accommodate the "requested size".
   const bool is_valid = buffer->free_size() >= (size_t)(used + requested);
   u1* const new_current_position = is_valid ? buffer->pos() + used : buffer->pos();
   w->long_field_put(start_pos_offset, (jlong)buffer->pos());
   w->long_field_put(current_pos_offset, (jlong)new_current_position);
   // only update java writer if underlying memory changed
   if (buffer != current) {
     w->long_field_put(start_pos_address_offset, (jlong)buffer->pos_address());
     w->long_field_put(max_pos_offset, (jlong)buffer->end());
   }
   if (!is_valid) {
     // mark writer as invalid for this write attempt
     w->release_bool_field_put(valid_offset, JNI_FALSE);
     return JNI_FALSE;
   }
   // An exclusive use of a leased buffer is treated equivalent to
   // holding a system resource. As such, it should be released as soon as possible.
   // Returning true here signals that the thread will need to call flush again
   // on EventWriter.endEvent() and that flush will return the lease.
   return buffer->lease() ? JNI_TRUE : JNI_FALSE;
 }
 class JfrJavaEventWriterNotificationClosure : public ThreadClosure {
  public:
    void do_thread(Thread* t) {
      if (t->is_Java_thread()) {
        JfrJavaEventWriter::notify((JavaThread*)t);
      }
    }
 };
 void JfrJavaEventWriter::notify() {
   assert(SafepointSynchronize::is_at_safepoint(), "invariant");
   JfrJavaEventWriterNotificationClosure closure;
   Threads::threads_do(&closure);
 }
 void JfrJavaEventWriter::notify(JavaThread* jt) {
   assert(jt != NULL, "invariant");
   assert(SafepointSynchronize::is_at_safepoint(), "invariant");
   if (jt->jfr_thread_local()->has_java_event_writer()) {
     oop buffer_writer = JNIHandles::resolve_non_null(jt->jfr_thread_local()->java_event_writer());
     assert(buffer_writer != NULL, "invariant");
     buffer_writer->release_bool_field_put(notified_offset, JNI_TRUE);
   }
 }
 static jobject create_new_event_writer(JfrBuffer* buffer, TRAPS) {
   assert(buffer != NULL, "invariant");
   DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(THREAD));
   HandleMark hm(THREAD);
   static const char klass[] = "jdk/jfr/internal/EventWriter";
   static const char method[] = "<init>";
   static const char signature[] = "(JJJJZ)V";
   JavaValue result(T_OBJECT);
   JfrJavaArguments args(&result, klass, method, signature, CHECK_NULL);
   // parameters
   args.push_long((jlong)buffer->pos());
   args.push_long((jlong)buffer->end());
   args.push_long((jlong)buffer->pos_address());
   args.push_long((jlong)JFR_THREAD_ID(THREAD));
   args.push_int((int)JNI_TRUE);
   JfrJavaSupport::new_object_global_ref(&args, CHECK_NULL);
   return result.get_jobject();
 }
 jobject JfrJavaEventWriter::event_writer(Thread* t) {
   DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(t));
   JfrThreadLocal* const tl = t->jfr_thread_local();
   assert(tl->shelved_buffer() == NULL, "invariant");
   return tl->java_event_writer();
 }
 jobject JfrJavaEventWriter::new_event_writer(TRAPS) {
   DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(THREAD));
   assert(event_writer(THREAD) == NULL, "invariant");
   JfrThreadLocal* const tl = THREAD->jfr_thread_local();
   assert(!tl->has_java_buffer(), "invariant");
   JfrBuffer* const buffer = tl->java_buffer();
   if (buffer == NULL) {
     JfrJavaSupport::throw_out_of_memory_error("OOME for thread local buffer", THREAD);
     return NULL;
   }
   jobject java_event_writer = create_new_event_writer(buffer, CHECK_NULL);
   tl->set_java_event_writer(java_event_writer);
   assert(tl->has_java_event_writer(), "invariant");
   return java_event_writer;
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/jfr/writers/jfrJavaEventWriter.cpp@b985cbb00e68 (annotated)

src/share/vm/jfr/writers/jfrJavaEventWriter.cpp