1 /*
   2  * Copyright (c) 2014, 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 #ifndef SHARE_VM_LEAKPROFILER_STARTOPERATION_HPP
  26 #define SHARE_VM_LEAKPROFILER_STARTOPERATION_HPP
  27 
  28 #include "jfr/recorder/jfrRecorder.hpp"
  29 #include "jfr/leakprofiler/leakProfiler.hpp"
  30 #include "jfr/leakprofiler/sampling/objectSampler.hpp"
  31 #include "jfr/recorder/service/jfrOptionSet.hpp"
  32 #include "logging/log.hpp"
  33 #include "runtime/vm_operations.hpp"
  34 
  35 // Safepoint operation for starting leak profiler object sampler
  36 class StartOperation : public VM_Operation {
  37  private:
  38   jlong _sample_count;
  39  public:
  40   StartOperation(jlong sample_count) :
  41     _sample_count(sample_count) {
  42   }
  43 
  44   Mode evaluation_mode() const {
  45     return _safepoint;
  46   }
  47 
  48   VMOp_Type type() const {
  49     return VMOp_GC_HeapInspection;
  50   }
  51 
  52   virtual void doit() {
  53     assert(!LeakProfiler::is_running(), "invariant");
  54     jint queue_size = JfrOptionSet::old_object_queue_size();
  55     LeakProfiler::set_object_sampler(new ObjectSampler(queue_size));
  56     log_trace(jfr, system)( "Object sampling started");
  57   }
  58 };
  59 
  60 #endif // SHARE_VM_LEAKPROFILER_STARTOPERATION_HPP