jdk8-mips64-public/hotspot: src/share/vm/jfr/leakprofiler/emitEventOperation.cpp@9c3c8469d9be (annotated)

src/share/vm/jfr/leakprofiler/emitEventOperation.cpp@9c3c8469d9be (annotated)

src/share/vm/jfr/leakprofiler/emitEventOperation.cpp

Thu, 13 Dec 2018 14:21:04 +0100

author: egahlin
date: Thu, 13 Dec 2018 14:21:04 +0100
changeset 9874: 9c3c8469d9be
parent 9867: 150ab470bf7f
permissions: -rw-r--r--

8215175: Inconsistencies in JFR event metadata
Reviewed-by: mgronlun

 /*
  * Copyright (c) 2014, 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 "gc_interface/collectedHeap.hpp"
 #include "jfr/jfrEvents.hpp"
 #include "jfr/leakprofiler/utilities/granularTimer.hpp"
 #include "jfr/leakprofiler/chains/rootSetClosure.hpp"
 #include "jfr/leakprofiler/chains/edge.hpp"
 #include "jfr/leakprofiler/chains/edgeQueue.hpp"
 #include "jfr/leakprofiler/chains/edgeStore.hpp"
 #include "jfr/leakprofiler/chains/bitset.hpp"
 #include "jfr/leakprofiler/sampling/objectSample.hpp"
 #include "jfr/leakprofiler/leakProfiler.hpp"
 #include "jfr/leakprofiler/checkpoint/objectSampleCheckpoint.hpp"
 #include "jfr/leakprofiler/sampling/objectSampler.hpp"
 #include "jfr/leakprofiler/emitEventOperation.hpp"
 #include "jfr/leakprofiler/chains/bfsClosure.hpp"
 #include "jfr/leakprofiler/chains/dfsClosure.hpp"
 #include "jfr/leakprofiler/chains/objectSampleMarker.hpp"
 #include "jfr/recorder/checkpoint/jfrCheckpointWriter.hpp"
 #include "jfr/support/jfrThreadId.hpp"
 #include "memory/resourceArea.hpp"
 #include "memory/universe.hpp"
 #include "oops/markOop.hpp"
 #include "oops/oop.inline.hpp"
 #include "runtime/safepoint.hpp"
 #include "runtime/vmThread.hpp"
 #include "utilities/globalDefinitions.hpp"
 /* The EdgeQueue is backed by directly managed virtual memory.
  * We will attempt to dimension an initial reservation
  * in proportion to the size of the heap (represented by heap_region).
  * Initial memory reservation: 5% of the heap OR at least 32 Mb
  * Commit ratio: 1 : 10 (subject to allocation granularties)
  */
 static size_t edge_queue_memory_reservation(const MemRegion& heap_region) {
   const size_t memory_reservation_bytes = MAX2(heap_region.byte_size() / 20, 32*M);
   assert(memory_reservation_bytes >= (size_t)32*M, "invariant");
   return memory_reservation_bytes;
 }
 static size_t edge_queue_memory_commit_size(size_t memory_reservation_bytes) {
   const size_t memory_commit_block_size_bytes = memory_reservation_bytes / 10;
   assert(memory_commit_block_size_bytes >= (size_t)3*M, "invariant");
   return memory_commit_block_size_bytes;
 }
 static void log_edge_queue_summary(const EdgeQueue& edge_queue) {
   if (LogJFR && Verbose) tty->print_cr("EdgeQueue reserved size total: " SIZE_FORMAT " [KB]", edge_queue.reserved_size() / K);
   if (LogJFR && Verbose) tty->print_cr("EdgeQueue edges total: " SIZE_FORMAT, edge_queue.top());
   if (LogJFR && Verbose) tty->print_cr("EdgeQueue liveset total: " SIZE_FORMAT " [KB]", edge_queue.live_set() / K);
   if (edge_queue.reserved_size() > 0) {
     if (LogJFR && Verbose) tty->print_cr("EdgeQueue commit reserve ratio: %f\n",
       ((double)edge_queue.live_set() / (double)edge_queue.reserved_size()));
   }
 }
 void EmitEventOperation::doit() {
   assert(LeakProfiler::is_running(), "invariant");
   _object_sampler = LeakProfiler::object_sampler();
   assert(_object_sampler != NULL, "invariant");
   _vm_thread = VMThread::vm_thread();
   assert(_vm_thread == Thread::current(), "invariant");
   _vm_thread_local = _vm_thread->jfr_thread_local();
   assert(_vm_thread_local != NULL, "invariant");
   assert(_vm_thread->jfr_thread_local()->thread_id() == JFR_THREAD_ID(_vm_thread), "invariant");
   // The VM_Operation::evaluate() which invoked doit()
   // contains a top level ResourceMark
   // save the original markWord for the potential leak objects
   // to be restored on function exit
   ObjectSampleMarker marker;
   if (ObjectSampleCheckpoint::mark(marker, _emit_all) == 0) {
     return;
   }
   EdgeStore edge_store;
   GranularTimer::start(_cutoff_ticks, 1000000);
   if (_cutoff_ticks <= 0) {
     // no chains
     write_events(&edge_store);
     return;
   }
   assert(_cutoff_ticks > 0, "invariant");
   // The bitset used for marking is dimensioned as a function of the heap size
   const MemRegion heap_region = Universe::heap()->reserved_region();
   BitSet mark_bits(heap_region);
   // The edge queue is dimensioned as a fraction of the heap size
   const size_t edge_queue_reservation_size = edge_queue_memory_reservation(heap_region);
   EdgeQueue edge_queue(edge_queue_reservation_size, edge_queue_memory_commit_size(edge_queue_reservation_size));
   // The initialize() routines will attempt to reserve and allocate backing storage memory.
   // Failure to accommodate will render root chain processing impossible.
   // As a fallback on failure, just write out the existing samples, flat, without chains.
   if (!(mark_bits.initialize() && edge_queue.initialize())) {
     if (LogJFR) tty->print_cr("Unable to allocate memory for root chain processing");
     write_events(&edge_store);
     return;
   }
   // necessary condition for attempting a root set iteration
   Universe::heap()->ensure_parsability(false);
   RootSetClosure::add_to_queue(&edge_queue);
   if (edge_queue.is_full()) {
     // Pathological case where roots don't fit in queue
     // Do a depth-first search, but mark roots first
     // to avoid walking sideways over roots
     DFSClosure::find_leaks_from_root_set(&edge_store, &mark_bits);
   } else {
     BFSClosure bfs(&edge_queue, &edge_store, &mark_bits);
     bfs.process();
   }
   GranularTimer::stop();
   write_events(&edge_store);
   log_edge_queue_summary(edge_queue);
 }
 int EmitEventOperation::write_events(EdgeStore* edge_store) {
   assert(_object_sampler != NULL, "invariant");
   assert(edge_store != NULL, "invariant");
   assert(_vm_thread != NULL, "invariant");
   assert(_vm_thread_local != NULL, "invariant");
   assert(SafepointSynchronize::is_at_safepoint(), "invariant");
   // save thread id in preparation for thread local trace data manipulations
   const traceid vmthread_id = _vm_thread_local->thread_id();
   assert(_vm_thread_local->thread_id() == JFR_THREAD_ID(_vm_thread), "invariant");
   const jlong last_sweep = _emit_all ? max_jlong : _object_sampler->last_sweep().value();
   int count = 0;
   const ObjectSample* current = _object_sampler->first();
   while (current != NULL) {
     ObjectSample* prev = current->prev();
     if (current->is_alive_and_older_than(last_sweep)) {
       write_event(current, edge_store);
       ++count;
     }
     current = prev;
   }
   // restore thread local stack trace and thread id
   _vm_thread_local->set_thread_id(vmthread_id);
   _vm_thread_local->clear_cached_stack_trace();
   assert(_vm_thread_local->thread_id() == JFR_THREAD_ID(_vm_thread), "invariant");
   if (count > 0) {
     // serialize assoicated checkpoints
     ObjectSampleCheckpoint::write(edge_store, _emit_all, _vm_thread);
   }
   return count;
 }
 static int array_size(const oop object) {
   assert(object != NULL, "invariant");
   if (object->is_array()) {
     return arrayOop(object)->length();
   }
   return min_jint;
 }
 void EmitEventOperation::write_event(const ObjectSample* sample, EdgeStore* edge_store) {
   assert(sample != NULL, "invariant");
   assert(!sample->is_dead(), "invariant");
   assert(edge_store != NULL, "invariant");
   assert(_vm_thread_local != NULL, "invariant");
   const oop* object_addr = sample->object_addr();
   assert(*object_addr != NULL, "invariant");
   const Edge* edge = (const Edge*)(*object_addr)->mark();
   traceid gc_root_id = 0;
   if (edge == NULL) {
     // In order to dump out a representation of the event
     // even though it was not reachable / too long to reach,
     // we need to register a top level edge for this object
     Edge e(NULL, object_addr);
     edge_store->add_chain(&e, 1);
     edge = (const Edge*)(*object_addr)->mark();
   } else {
     gc_root_id = edge_store->get_root_id(edge);
   }
   assert(edge != NULL, "invariant");
   assert(edge->pointee() == *object_addr, "invariant");
   const traceid object_id = edge_store->get_id(edge);
   assert(object_id != 0, "invariant");
   EventOldObjectSample e(UNTIMED);
   e.set_starttime(GranularTimer::start_time());
   e.set_endtime(GranularTimer::end_time());
   e.set_allocationTime(sample->allocation_time());
   e.set_lastKnownHeapUsage(sample->heap_used_at_last_gc());
   e.set_object(object_id);
   e.set_arrayElements(array_size(*object_addr));
   e.set_root(gc_root_id);
   // Temporarily assigning both the stack trace id and thread id
   // onto the thread local data structure of the VMThread (for the duration
   // of the commit() call). This trick provides a means to override
   // the event generation mechanism by injecting externally provided id's.
   // Here, in particular, this allows us to emit an old object event
   // supplying information from where the actual sampling occurred.
   _vm_thread_local->set_cached_stack_trace_id(sample->stack_trace_id());
   assert(sample->has_thread(), "invariant");
   _vm_thread_local->set_thread_id(sample->thread_id());
   e.commit();
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/jfr/leakprofiler/emitEventOperation.cpp@9c3c8469d9be (annotated)

src/share/vm/jfr/leakprofiler/emitEventOperation.cpp