jdk8-mips64-public/hotspot: src/share/vm/runtime/dtraceJSDT.hpp@72053ed6f8d4 (annotated)

src/share/vm/runtime/dtraceJSDT.hpp@72053ed6f8d4 (annotated)

src/share/vm/runtime/dtraceJSDT.hpp

Thu, 24 Nov 2016 11:27:57 +0100

author: tschatzl
date: Thu, 24 Nov 2016 11:27:57 +0100
changeset 9982: 72053ed6f8d4
parent 4153: b9a9ed0f8eeb
child 6876: 710a3c8b516e
permissions: -rw-r--r--

8057003: Large reference arrays cause extremely long synchronization times
Summary: Slice large object arrays into parts so that the synchronization of marking threads with an STW pause request does not take long.
Reviewed-by: ehelin, pliden
Contributed-by: maoliang.ml@alibaba-inc.com

 /*
  * Copyright (c) 1997, 2012, 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.
  *
  */
 #ifndef SHARE_VM_RUNTIME_DTRACEJSDT_HPP
 #define SHARE_VM_RUNTIME_DTRACEJSDT_HPP
 #include "code/nmethod.hpp"
 #ifdef TARGET_ARCH_x86
 # include "nativeInst_x86.hpp"
 #endif
 #ifdef TARGET_ARCH_sparc
 # include "nativeInst_sparc.hpp"
 #endif
 #ifdef TARGET_ARCH_zero
 # include "nativeInst_zero.hpp"
 #endif
 #ifdef TARGET_ARCH_arm
 # include "nativeInst_arm.hpp"
 #endif
 #ifdef TARGET_ARCH_ppc
 # include "nativeInst_ppc.hpp"
 #endif
 class RegisteredProbes;
 typedef jlong OpaqueProbes;
 class DTraceJSDT : AllStatic {
  private:
   static int pd_activate(void* moduleBaseAddress, jstring module,
       jint providers_count, JVM_DTraceProvider* providers);
   static void pd_dispose(int handle);
   static jboolean pd_is_supported();
  public:
   static OpaqueProbes activate(
       jint version, jstring module_name, jint providers_count,
       JVM_DTraceProvider* providers, TRAPS);
   static jboolean is_probe_enabled(jmethodID method);
   static void dispose(OpaqueProbes handle);
   static jboolean is_supported();
 };
 class RegisteredProbes : public CHeapObj<mtInternal> {
  private:
   nmethod** _nmethods;      // all the probe methods
   size_t    _count;         // number of probe methods
   int       _helper_handle; // DTrace-assigned identifier
  public:
   RegisteredProbes(size_t count) {
     _count = count;
     _nmethods = NEW_C_HEAP_ARRAY(nmethod*, count, mtInternal);
   }
   ~RegisteredProbes() {
     for (size_t i = 0; i < _count; ++i) {
       // Let the sweeper reclaim it
       _nmethods[i]->make_not_entrant();
       _nmethods[i]->method()->clear_code();
     }
     FREE_C_HEAP_ARRAY(nmethod*, _nmethods, mtInternal);
     _nmethods = NULL;
     _count = 0;
   }
   static RegisteredProbes* toRegisteredProbes(OpaqueProbes p) {
     return (RegisteredProbes*)(intptr_t)p;
   }
   static OpaqueProbes toOpaqueProbes(RegisteredProbes* p) {
     return (OpaqueProbes)(intptr_t)p;
   }
   void set_helper_handle(int handle) { _helper_handle = handle; }
   int helper_handle() const { return _helper_handle; }
   nmethod* nmethod_at(size_t i) {
     assert(i >= 0 && i < _count, "bad nmethod index");
     return _nmethods[i];
   }
   void nmethod_at_put(size_t i, nmethod* nm) {
     assert(i >= 0 && i < _count, "bad nmethod index");
     _nmethods[i] = nm;
   }
 };
 #endif // SHARE_VM_RUNTIME_DTRACEJSDT_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/dtraceJSDT.hpp@72053ed6f8d4 (annotated)

src/share/vm/runtime/dtraceJSDT.hpp