jdk8-mips64-public/hotspot: src/share/vm/runtime/interfaceSupport.cpp@27ae9bbef86a (annotated)

src/share/vm/runtime/interfaceSupport.cpp@27ae9bbef86a (annotated)

src/share/vm/runtime/interfaceSupport.cpp

Thu, 15 Dec 2016 19:48:32 -0500

author: tschatzl
date: Thu, 15 Dec 2016 19:48:32 -0500
changeset 8661: 27ae9bbef86a
parent 7875: fb260f267e87
child 7994: 04ff2f6cd0eb
permissions: -rw-r--r--

8147910: Cache initial active_processor_count
Summary: Introduce and initialize active_processor_count variable in VM.
Reviewed-by: dholmes, jprovino

 /*
  * Copyright (c) 1997, 2014, 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_implementation/shared/markSweep.hpp"
 #include "gc_interface/collectedHeap.hpp"
 #include "gc_interface/collectedHeap.inline.hpp"
 #include "memory/genCollectedHeap.hpp"
 #include "memory/resourceArea.hpp"
 #include "runtime/init.hpp"
 #include "runtime/interfaceSupport.hpp"
 #include "runtime/orderAccess.inline.hpp"
 #include "runtime/threadLocalStorage.hpp"
 #include "runtime/vframe.hpp"
 #include "utilities/preserveException.hpp"
 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
 // Implementation of InterfaceSupport
 #ifdef ASSERT
 long InterfaceSupport::_number_of_calls       = 0;
 long InterfaceSupport::_scavenge_alot_counter = 1;
 long InterfaceSupport::_fullgc_alot_counter   = 1;
 long InterfaceSupport::_fullgc_alot_invocation = 0;
 Histogram* RuntimeHistogram;
 RuntimeHistogramElement::RuntimeHistogramElement(const char* elementName) {
   static volatile jint RuntimeHistogram_lock = 0;
   _name = elementName;
   uintx count = 0;
   while (Atomic::cmpxchg(1, &RuntimeHistogram_lock, 0) != 0) {
     while (OrderAccess::load_acquire(&RuntimeHistogram_lock) != 0) {
       count +=1;
       if ( (WarnOnStalledSpinLock > 0)
         && (count % WarnOnStalledSpinLock == 0)) {
         warning("RuntimeHistogram_lock seems to be stalled");
       }
     }
   }
   if (RuntimeHistogram == NULL) {
     RuntimeHistogram = new Histogram("VM Runtime Call Counts",200);
   }
   RuntimeHistogram->add_element(this);
   Atomic::dec(&RuntimeHistogram_lock);
 }
 void InterfaceSupport::trace(const char* result_type, const char* header) {
   tty->print_cr("%6d  %s", _number_of_calls, header);
 }
 void InterfaceSupport::gc_alot() {
   Thread *thread = Thread::current();
   if (!thread->is_Java_thread()) return; // Avoid concurrent calls
   // Check for new, not quite initialized thread. A thread in new mode cannot initiate a GC.
   JavaThread *current_thread = (JavaThread *)thread;
   if (current_thread->active_handles() == NULL) return;
   // Short-circuit any possible re-entrant gc-a-lot attempt
   if (thread->skip_gcalot()) return;
   if (Threads::is_vm_complete()) {
     if (++_fullgc_alot_invocation < FullGCALotStart) {
       return;
     }
     // Use this line if you want to block at a specific point,
     // e.g. one number_of_calls/scavenge/gc before you got into problems
     if (FullGCALot) _fullgc_alot_counter--;
     // Check if we should force a full gc
     if (_fullgc_alot_counter == 0) {
       // Release dummy so objects are forced to move
       if (!Universe::release_fullgc_alot_dummy()) {
         warning("FullGCALot: Unable to release more dummies at bottom of heap");
       }
       HandleMark hm(thread);
       Universe::heap()->collect(GCCause::_full_gc_alot);
       unsigned int invocations = Universe::heap()->total_full_collections();
       // Compute new interval
       if (FullGCALotInterval > 1) {
         _fullgc_alot_counter = 1+(long)((double)FullGCALotInterval*os::random()/(max_jint+1.0));
         if (PrintGCDetails && Verbose) {
           tty->print_cr("Full gc no: %u\tInterval: %d", invocations,
                         _fullgc_alot_counter);
         }
       } else {
         _fullgc_alot_counter = 1;
       }
       // Print progress message
       if (invocations % 100 == 0) {
         if (PrintGCDetails && Verbose) tty->print_cr("Full gc no: %u", invocations);
       }
     } else {
       if (ScavengeALot) _scavenge_alot_counter--;
       // Check if we should force a scavenge
       if (_scavenge_alot_counter == 0) {
         HandleMark hm(thread);
         Universe::heap()->collect(GCCause::_scavenge_alot);
         unsigned int invocations = Universe::heap()->total_collections() - Universe::heap()->total_full_collections();
         // Compute new interval
         if (ScavengeALotInterval > 1) {
           _scavenge_alot_counter = 1+(long)((double)ScavengeALotInterval*os::random()/(max_jint+1.0));
           if (PrintGCDetails && Verbose) {
             tty->print_cr("Scavenge no: %u\tInterval: %d", invocations,
                           _scavenge_alot_counter);
           }
         } else {
           _scavenge_alot_counter = 1;
         }
         // Print progress message
         if (invocations % 1000 == 0) {
           if (PrintGCDetails && Verbose) tty->print_cr("Scavenge no: %u", invocations);
         }
       }
     }
   }
 }
 vframe* vframe_array[50];
 int walk_stack_counter = 0;
 void InterfaceSupport::walk_stack_from(vframe* start_vf) {
   // walk
   int i = 0;
   for (vframe* f = start_vf; f; f = f->sender() ) {
     if (i < 50) vframe_array[i++] = f;
   }
 }
 void InterfaceSupport::walk_stack() {
   JavaThread* thread = JavaThread::current();
   walk_stack_counter++;
   if (!thread->has_last_Java_frame()) return;
   ResourceMark rm(thread);
   RegisterMap reg_map(thread);
   walk_stack_from(thread->last_java_vframe(&reg_map));
 }
 # ifdef ENABLE_ZAP_DEAD_LOCALS
 static int zap_traversals = 0;
 void InterfaceSupport::zap_dead_locals_old() {
   JavaThread* thread = JavaThread::current();
   if (zap_traversals == -1) // edit constant for debugging
     warning("I am here");
   int zap_frame_count = 0; // count frames to help debugging
   for (StackFrameStream sfs(thread); !sfs.is_done(); sfs.next()) {
     sfs.current()->zap_dead_locals(thread, sfs.register_map());
     ++zap_frame_count;
   }
   ++zap_traversals;
 }
 # endif
 // invocation counter for InterfaceSupport::deoptimizeAll/zombieAll functions
 int deoptimizeAllCounter = 0;
 int zombieAllCounter = 0;
 void InterfaceSupport::zombieAll() {
   // This method is called by all threads when a thread make
   // transition to VM state (for example, runtime calls).
   // Divide number of calls by number of threads to avoid
   // dependence of ZombieAll events frequency on number of threads.
   int value = zombieAllCounter / Threads::number_of_threads();
   if (is_init_completed() && value > ZombieALotInterval) {
     zombieAllCounter = 0;
     VM_ZombieAll op;
     VMThread::execute(&op);
   }
   zombieAllCounter++;
 }
 void InterfaceSupport::unlinkSymbols() {
   VM_UnlinkSymbols op;
   VMThread::execute(&op);
 }
 void InterfaceSupport::deoptimizeAll() {
   // This method is called by all threads when a thread make
   // transition to VM state (for example, runtime calls).
   // Divide number of calls by number of threads to avoid
   // dependence of DeoptimizeAll events frequency on number of threads.
   int value = deoptimizeAllCounter / Threads::number_of_threads();
   if (is_init_completed()) {
     if (DeoptimizeALot && value > DeoptimizeALotInterval) {
       deoptimizeAllCounter = 0;
       VM_DeoptimizeAll op;
       VMThread::execute(&op);
     } else if (DeoptimizeRandom && (value & 0x1F) == (os::random() & 0x1F)) {
       VM_DeoptimizeAll op;
       VMThread::execute(&op);
     }
   }
   deoptimizeAllCounter++;
 }
 void InterfaceSupport::stress_derived_pointers() {
 #ifdef COMPILER2
   JavaThread *thread = JavaThread::current();
   if (!is_init_completed()) return;
   ResourceMark rm(thread);
   bool found = false;
   for (StackFrameStream sfs(thread); !sfs.is_done() && !found; sfs.next()) {
     CodeBlob* cb = sfs.current()->cb();
     if (cb != NULL && cb->oop_maps() ) {
       // Find oopmap for current method
       OopMap* map = cb->oop_map_for_return_address(sfs.current()->pc());
       assert(map != NULL, "no oopmap found for pc");
       found = map->has_derived_pointer();
     }
   }
   if (found) {
     // $$$ Not sure what to do here.
     /*
     Scavenge::invoke(0);
     */
   }
 #endif
 }
 void InterfaceSupport::verify_stack() {
   JavaThread* thread = JavaThread::current();
   ResourceMark rm(thread);
   // disabled because it throws warnings that oop maps should only be accessed
   // in VM thread or during debugging
   if (!thread->has_pending_exception()) {
     // verification does not work if there are pending exceptions
     StackFrameStream sfs(thread);
     CodeBlob* cb = sfs.current()->cb();
       // In case of exceptions we might not have a runtime_stub on
       // top of stack, hence, all callee-saved registers are not going
       // to be setup correctly, hence, we cannot do stack verify
     if (cb != NULL && !(cb->is_runtime_stub() || cb->is_uncommon_trap_stub())) return;
     for (; !sfs.is_done(); sfs.next()) {
       sfs.current()->verify(sfs.register_map());
     }
   }
 }
 void InterfaceSupport::verify_last_frame() {
   JavaThread* thread = JavaThread::current();
   ResourceMark rm(thread);
   RegisterMap reg_map(thread);
   frame fr = thread->last_frame();
   fr.verify(&reg_map);
 }
 #endif // ASSERT
 void InterfaceSupport_init() {
 #ifdef ASSERT
   if (ScavengeALot || FullGCALot) {
     srand(ScavengeALotInterval * FullGCALotInterval);
   }
 #endif
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/interfaceSupport.cpp@27ae9bbef86a (annotated)

src/share/vm/runtime/interfaceSupport.cpp