hotspot/src/share/vm/runtime/interfaceSupport.cpp
author rprotacio
Tue, 24 Nov 2015 11:40:18 -0500
changeset 34285 0b07014c15e9
parent 33148 68fa8b6c4340
child 34633 2a6c7c7b30a7
permissions -rw-r--r--
8143155: Remove TraceRuntimeCalls, TraceJNICalls, and TraceJVMCalls rather than convert to UL Summary: Removed TraceRuntimeCalls, TraceJNICalls, and TraceJVMCalls options because their output is excessive, not useful, and covered in a more useful way by other options. Reviewed-by: coleenp, dholmes, ddmitriev
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/*
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 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "gc/shared/collectedHeap.hpp"
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#include "gc/shared/collectedHeap.inline.hpp"
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#include "gc/shared/genCollectedHeap.hpp"
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#include "memory/resourceArea.hpp"
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#include "runtime/atomic.inline.hpp"
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#include "runtime/init.hpp"
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#include "runtime/interfaceSupport.hpp"
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#include "runtime/orderAccess.inline.hpp"
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#include "runtime/os.inline.hpp"
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#include "runtime/threadLocalStorage.hpp"
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#include "runtime/vframe.hpp"
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#include "utilities/preserveException.hpp"
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// Implementation of InterfaceSupport
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#ifdef ASSERT
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long InterfaceSupport::_number_of_calls       = 0;
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long InterfaceSupport::_scavenge_alot_counter = 1;
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long InterfaceSupport::_fullgc_alot_counter   = 1;
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long InterfaceSupport::_fullgc_alot_invocation = 0;
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Histogram* RuntimeHistogram;
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RuntimeHistogramElement::RuntimeHistogramElement(const char* elementName) {
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  static volatile jint RuntimeHistogram_lock = 0;
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  _name = elementName;
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  uintx count = 0;
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  while (Atomic::cmpxchg(1, &RuntimeHistogram_lock, 0) != 0) {
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    while (OrderAccess::load_acquire(&RuntimeHistogram_lock) != 0) {
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      count +=1;
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      if ( (WarnOnStalledSpinLock > 0)
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        && (count % WarnOnStalledSpinLock == 0)) {
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        warning("RuntimeHistogram_lock seems to be stalled");
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      }
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    }
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  }
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  if (RuntimeHistogram == NULL) {
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    RuntimeHistogram = new Histogram("VM Runtime Call Counts",200);
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  }
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  RuntimeHistogram->add_element(this);
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  Atomic::dec(&RuntimeHistogram_lock);
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}
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void InterfaceSupport::gc_alot() {
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  Thread *thread = Thread::current();
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  if (!thread->is_Java_thread()) return; // Avoid concurrent calls
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  // Check for new, not quite initialized thread. A thread in new mode cannot initiate a GC.
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  JavaThread *current_thread = (JavaThread *)thread;
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  if (current_thread->active_handles() == NULL) return;
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  // Short-circuit any possible re-entrant gc-a-lot attempt
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  if (thread->skip_gcalot()) return;
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  if (Threads::is_vm_complete()) {
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    if (++_fullgc_alot_invocation < FullGCALotStart) {
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      return;
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    }
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    // Use this line if you want to block at a specific point,
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    // e.g. one number_of_calls/scavenge/gc before you got into problems
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    if (FullGCALot) _fullgc_alot_counter--;
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    // Check if we should force a full gc
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    if (_fullgc_alot_counter == 0) {
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      // Release dummy so objects are forced to move
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      if (!Universe::release_fullgc_alot_dummy()) {
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        warning("FullGCALot: Unable to release more dummies at bottom of heap");
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      }
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      HandleMark hm(thread);
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      Universe::heap()->collect(GCCause::_full_gc_alot);
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      unsigned int invocations = Universe::heap()->total_full_collections();
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      // Compute new interval
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      if (FullGCALotInterval > 1) {
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        _fullgc_alot_counter = 1+(long)((double)FullGCALotInterval*os::random()/(max_jint+1.0));
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        if (PrintGCDetails && Verbose) {
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          tty->print_cr("Full gc no: %u\tInterval: %ld", invocations, _fullgc_alot_counter);
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        }
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      } else {
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        _fullgc_alot_counter = 1;
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      }
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      // Print progress message
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      if (invocations % 100 == 0) {
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        if (PrintGCDetails && Verbose) tty->print_cr("Full gc no: %u", invocations);
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      }
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    } else {
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      if (ScavengeALot) _scavenge_alot_counter--;
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      // Check if we should force a scavenge
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      if (_scavenge_alot_counter == 0) {
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        HandleMark hm(thread);
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        Universe::heap()->collect(GCCause::_scavenge_alot);
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        unsigned int invocations = Universe::heap()->total_collections() - Universe::heap()->total_full_collections();
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        // Compute new interval
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        if (ScavengeALotInterval > 1) {
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          _scavenge_alot_counter = 1+(long)((double)ScavengeALotInterval*os::random()/(max_jint+1.0));
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          if (PrintGCDetails && Verbose) {
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            tty->print_cr("Scavenge no: %u\tInterval: %ld", invocations, _scavenge_alot_counter);
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          }
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        } else {
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          _scavenge_alot_counter = 1;
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        }
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        // Print progress message
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        if (invocations % 1000 == 0) {
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          if (PrintGCDetails && Verbose) tty->print_cr("Scavenge no: %u", invocations);
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        }
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      }
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    }
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  }
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}
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vframe* vframe_array[50];
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int walk_stack_counter = 0;
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void InterfaceSupport::walk_stack_from(vframe* start_vf) {
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  // walk
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  int i = 0;
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  for (vframe* f = start_vf; f; f = f->sender() ) {
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    if (i < 50) vframe_array[i++] = f;
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  }
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}
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void InterfaceSupport::walk_stack() {
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  JavaThread* thread = JavaThread::current();
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  walk_stack_counter++;
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  if (!thread->has_last_Java_frame()) return;
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  ResourceMark rm(thread);
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  RegisterMap reg_map(thread);
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  walk_stack_from(thread->last_java_vframe(&reg_map));
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}
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// invocation counter for InterfaceSupport::deoptimizeAll/zombieAll functions
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int deoptimizeAllCounter = 0;
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int zombieAllCounter = 0;
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void InterfaceSupport::zombieAll() {
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  // This method is called by all threads when a thread make
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  // transition to VM state (for example, runtime calls).
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  // Divide number of calls by number of threads to avoid
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  // dependence of ZombieAll events frequency on number of threads.
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  int value = zombieAllCounter / Threads::number_of_threads();
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  if (is_init_completed() && value > ZombieALotInterval) {
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    zombieAllCounter = 0;
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    VM_ZombieAll op;
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    VMThread::execute(&op);
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  }
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  zombieAllCounter++;
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}
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void InterfaceSupport::unlinkSymbols() {
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  VM_UnlinkSymbols op;
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  VMThread::execute(&op);
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}
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void InterfaceSupport::deoptimizeAll() {
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  // This method is called by all threads when a thread make
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  // transition to VM state (for example, runtime calls).
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  // Divide number of calls by number of threads to avoid
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  // dependence of DeoptimizeAll events frequency on number of threads.
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  int value = deoptimizeAllCounter / Threads::number_of_threads();
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  if (is_init_completed()) {
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    if (DeoptimizeALot && value > DeoptimizeALotInterval) {
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      deoptimizeAllCounter = 0;
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      VM_DeoptimizeAll op;
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      VMThread::execute(&op);
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    } else if (DeoptimizeRandom && (value & 0x1F) == (os::random() & 0x1F)) {
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      VM_DeoptimizeAll op;
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      VMThread::execute(&op);
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    }
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  }
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  deoptimizeAllCounter++;
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}
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void InterfaceSupport::stress_derived_pointers() {
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#ifdef COMPILER2
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  JavaThread *thread = JavaThread::current();
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  if (!is_init_completed()) return;
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  ResourceMark rm(thread);
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  bool found = false;
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  for (StackFrameStream sfs(thread); !sfs.is_done() && !found; sfs.next()) {
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    CodeBlob* cb = sfs.current()->cb();
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    if (cb != NULL && cb->oop_maps() ) {
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      // Find oopmap for current method
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      const ImmutableOopMap* map = cb->oop_map_for_return_address(sfs.current()->pc());
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      assert(map != NULL, "no oopmap found for pc");
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      found = map->has_derived_pointer();
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    }
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  }
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  if (found) {
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    // $$$ Not sure what to do here.
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    /*
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    Scavenge::invoke(0);
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    */
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  }
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#endif
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}
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void InterfaceSupport::verify_stack() {
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  JavaThread* thread = JavaThread::current();
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  ResourceMark rm(thread);
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  // disabled because it throws warnings that oop maps should only be accessed
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  // in VM thread or during debugging
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  if (!thread->has_pending_exception()) {
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    // verification does not work if there are pending exceptions
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    StackFrameStream sfs(thread);
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    CodeBlob* cb = sfs.current()->cb();
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      // In case of exceptions we might not have a runtime_stub on
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      // top of stack, hence, all callee-saved registers are not going
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      // to be setup correctly, hence, we cannot do stack verify
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    if (cb != NULL && !(cb->is_runtime_stub() || cb->is_uncommon_trap_stub())) return;
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    for (; !sfs.is_done(); sfs.next()) {
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      sfs.current()->verify(sfs.register_map());
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    }
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  }
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}
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void InterfaceSupport::verify_last_frame() {
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  JavaThread* thread = JavaThread::current();
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  ResourceMark rm(thread);
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  RegisterMap reg_map(thread);
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  frame fr = thread->last_frame();
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  fr.verify(&reg_map);
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}
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#endif // ASSERT
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void InterfaceSupport_init() {
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#ifdef ASSERT
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  if (ScavengeALot || FullGCALot) {
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    srand(ScavengeALotInterval * FullGCALotInterval);
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  }
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#endif
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}