Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 2006, 2013, 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 "code/codeCache.hpp"

 #include "memory/resourceArea.hpp"

 #include "runtime/deoptimization.hpp"

 #include "runtime/vmThread.hpp"

 #include "runtime/vm_operations.hpp"

 #include "services/dtraceAttacher.hpp"

 #ifdef SOLARIS

 class VM_DeoptimizeTheWorld : public VM_Operation {

  public:

   VMOp_Type type() const {

     return VMOp_DeoptimizeTheWorld;

   }

   void doit() {

     CodeCache::mark_all_nmethods_for_deoptimization();

     ResourceMark rm;

     DeoptimizationMarker dm;

     // Deoptimize all activations depending on marked methods

     Deoptimization::deoptimize_dependents();

     // Mark the dependent methods non entrant

     CodeCache::make_marked_nmethods_not_entrant();

   }

 };

 static void set_bool_flag(const char* flag, bool value) {

   CommandLineFlags::boolAtPut((char*)flag, strlen(flag), &value,

                               Flag::ATTACH_ON_DEMAND);

 }

 // Enable only the "fine grained" flags. Do *not* touch

 // the overall "ExtendedDTraceProbes" flag.

 void DTrace::enable_dprobes(int probes) {

   bool changed = false;

   if (!DTraceAllocProbes && (probes & DTRACE_ALLOC_PROBES)) {

     set_bool_flag("DTraceAllocProbes", true);

     changed = true;

   }

   if (!DTraceMethodProbes && (probes & DTRACE_METHOD_PROBES)) {

     set_bool_flag("DTraceMethodProbes", true);

     changed = true;

   }

   if (!DTraceMonitorProbes && (probes & DTRACE_MONITOR_PROBES)) {

     set_bool_flag("DTraceMonitorProbes", true);

     changed = true;

   }

   if (changed) {

     // one or more flags changed, need to deoptimize

     VM_DeoptimizeTheWorld op;

     VMThread::execute(&op);

   }

 }

 // Disable only the "fine grained" flags. Do *not* touch

 // the overall "ExtendedDTraceProbes" flag.

 void DTrace::disable_dprobes(int probes) {

   bool changed = false;

   if (DTraceAllocProbes && (probes & DTRACE_ALLOC_PROBES)) {

     set_bool_flag("DTraceAllocProbes", false);

     changed = true;

   }

   if (DTraceMethodProbes && (probes & DTRACE_METHOD_PROBES)) {

     set_bool_flag("DTraceMethodProbes", false);

     changed = true;

   }

   if (DTraceMonitorProbes && (probes & DTRACE_MONITOR_PROBES)) {

     set_bool_flag("DTraceMonitorProbes", false);

     changed = true;

   }

   if (changed) {

     // one or more flags changed, need to deoptimize

     VM_DeoptimizeTheWorld op;

     VMThread::execute(&op);

   }

 }

 // Do clean-up on "all door clients detached" event.

 void DTrace::detach_all_clients() {

   /*

    * We restore the state of the fine grained flags

    * to be consistent with overall ExtendedDTraceProbes.

    * This way, we will honour command line setting or the

    * last explicit modification of ExtendedDTraceProbes by

    * a call to set_extended_dprobes.

    */

   if (ExtendedDTraceProbes) {

     enable_dprobes(DTRACE_ALL_PROBES);

   } else {

     disable_dprobes(DTRACE_ALL_PROBES);

   }

 }

 void DTrace::set_extended_dprobes(bool flag) {

   // explicit setting of ExtendedDTraceProbes flag

   set_bool_flag("ExtendedDTraceProbes", flag);

   // make sure that the fine grained flags reflect the change.

   if (flag) {

     enable_dprobes(DTRACE_ALL_PROBES);

   } else {

     /*

      * FIXME: Revisit this: currently all-client-detach detection

      * does not work and hence disabled. The following scheme does

      * not work. So, we have to disable fine-grained flags here.

      *

      * disable_dprobes call has to be delayed till next "detach all "event.

      * This is to be  done so that concurrent DTrace clients that may

      * have enabled one or more fine grained dprobes and may be running

      * still. On "detach all" clients event, we would sync ExtendedDTraceProbes

      * with  fine grained flags which would take care of disabling fine grained flags.

      */

     disable_dprobes(DTRACE_ALL_PROBES);

   }

 }

 void DTrace::set_monitor_dprobes(bool flag) {

   // explicit setting of DTraceMonitorProbes flag

   set_bool_flag("DTraceMonitorProbes", flag);

 }

 #endif /* SOLARIS */