rev 54697 : imported patch 8221734-v2-merge
rev 54698 : imported patch 8221734-v2

   1 /*
   2  * Copyright (c) 2006, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "code/codeCache.hpp"
  27 #include "memory/resourceArea.hpp"
  28 #include "runtime/deoptimization.hpp"
  29 #include "runtime/flags/jvmFlag.hpp"
  30 #include "runtime/vmThread.hpp"
  31 #include "runtime/vmOperations.hpp"
  32 #include "services/dtraceAttacher.hpp"
  33 
  34 #ifdef SOLARIS
  35 
  36 class VM_DeoptimizeTheWorld : public VM_Operation {
  37  public:
  38   VMOp_Type type() const {
  39     return VMOp_DeoptimizeTheWorld;
  40   }
  41   void doit() {
  42     CodeCache::mark_all_nmethods_for_deoptimization();
  43     ResourceMark rm;
  44     DeoptimizationMarker dm;
  45     // Deoptimize all activations depending on marked methods
  46     Deoptimization::deoptimize_dependents();
  47 
  48     // Mark the dependent methods non entrant
  49     CodeCache::make_marked_nmethods_not_entrant();
  50   }
  51 };
  52 
  53 static void set_bool_flag(const char* flag, bool value) {
  54   JVMFlag::boolAtPut((char*)flag, strlen(flag), &value,
  55                               JVMFlag::ATTACH_ON_DEMAND);
  56 }
  57 
  58 // Enable only the "fine grained" flags. Do *not* touch
  59 // the overall "ExtendedDTraceProbes" flag.
  60 void DTrace::enable_dprobes(int probes) {
  61   bool changed = false;
  62   if (!DTraceAllocProbes && (probes & DTRACE_ALLOC_PROBES)) {
  63     set_bool_flag("DTraceAllocProbes", true);
  64     changed = true;
  65   }
  66   if (!DTraceMethodProbes && (probes & DTRACE_METHOD_PROBES)) {
  67     set_bool_flag("DTraceMethodProbes", true);
  68     changed = true;
  69   }
  70   if (!DTraceMonitorProbes && (probes & DTRACE_MONITOR_PROBES)) {
  71     set_bool_flag("DTraceMonitorProbes", true);
  72     changed = true;
  73   }
  74 
  75   if (changed) {
  76     // one or more flags changed, need to deoptimize
  77     VM_DeoptimizeTheWorld op;
  78     VMThread::execute(&op);
  79   }
  80 }
  81 
  82 // Disable only the "fine grained" flags. Do *not* touch
  83 // the overall "ExtendedDTraceProbes" flag.
  84 void DTrace::disable_dprobes(int probes) {
  85   bool changed = false;
  86   if (DTraceAllocProbes && (probes & DTRACE_ALLOC_PROBES)) {
  87     set_bool_flag("DTraceAllocProbes", false);
  88     changed = true;
  89   }
  90   if (DTraceMethodProbes && (probes & DTRACE_METHOD_PROBES)) {
  91     set_bool_flag("DTraceMethodProbes", false);
  92     changed = true;
  93   }
  94   if (DTraceMonitorProbes && (probes & DTRACE_MONITOR_PROBES)) {
  95     set_bool_flag("DTraceMonitorProbes", false);
  96     changed = true;
  97   }
  98   if (changed) {
  99     // one or more flags changed, need to deoptimize
 100     VM_DeoptimizeTheWorld op;
 101     VMThread::execute(&op);
 102   }
 103 }
 104 
 105 // Do clean-up on "all door clients detached" event.
 106 void DTrace::detach_all_clients() {
 107   /*
 108    * We restore the state of the fine grained flags
 109    * to be consistent with overall ExtendedDTraceProbes.
 110    * This way, we will honour command line setting or the
 111    * last explicit modification of ExtendedDTraceProbes by
 112    * a call to set_extended_dprobes.
 113    */
 114   if (ExtendedDTraceProbes) {
 115     enable_dprobes(DTRACE_ALL_PROBES);
 116   } else {
 117     disable_dprobes(DTRACE_ALL_PROBES);
 118   }
 119 }
 120 
 121 void DTrace::set_extended_dprobes(bool flag) {
 122   // explicit setting of ExtendedDTraceProbes flag
 123   set_bool_flag("ExtendedDTraceProbes", flag);
 124 
 125   // make sure that the fine grained flags reflect the change.
 126   if (flag) {
 127     enable_dprobes(DTRACE_ALL_PROBES);
 128   } else {
 129     /*
 130      * FIXME: Revisit this: currently all-client-detach detection
 131      * does not work and hence disabled. The following scheme does
 132      * not work. So, we have to disable fine-grained flags here.
 133      *
 134      * disable_dprobes call has to be delayed till next "detach all "event.
 135      * This is to be  done so that concurrent DTrace clients that may
 136      * have enabled one or more fine grained dprobes and may be running
 137      * still. On "detach all" clients event, we would sync ExtendedDTraceProbes
 138      * with  fine grained flags which would take care of disabling fine grained flags.
 139      */
 140     disable_dprobes(DTRACE_ALL_PROBES);
 141   }
 142 }
 143 
 144 void DTrace::set_monitor_dprobes(bool flag) {
 145   // explicit setting of DTraceMonitorProbes flag
 146   set_bool_flag("DTraceMonitorProbes", flag);
 147 }
 148 
 149 #endif /* SOLARIS */
--- EOF ---