src/hotspot/share/services/dtraceAttacher.cpp
author rehn
Thu, 19 Sep 2019 10:52:22 +0200
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8226705: [REDO] Deoptimize with handshakes Reviewed-by: eosterlund, dcubed, dlong, pchilanomate
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/*
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 * Copyright (c) 2006, 2019, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "code/codeCache.hpp"
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#include "memory/resourceArea.hpp"
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#include "runtime/deoptimization.hpp"
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#include "runtime/flags/jvmFlag.hpp"
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#include "runtime/vmThread.hpp"
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#include "runtime/vmOperations.hpp"
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#include "services/dtraceAttacher.hpp"
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#ifdef SOLARIS
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static void set_bool_flag(const char* name, bool value) {
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  JVMFlag* flag = JVMFlag::find_flag(name);
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  JVMFlag::boolAtPut(flag, &value, JVMFlag::ATTACH_ON_DEMAND);
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}
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// Enable only the "fine grained" flags. Do *not* touch
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// the overall "ExtendedDTraceProbes" flag.
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void DTrace::enable_dprobes(int probes) {
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  bool changed = false;
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  if (!DTraceAllocProbes && (probes & DTRACE_ALLOC_PROBES)) {
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    set_bool_flag("DTraceAllocProbes", true);
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    changed = true;
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  }
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  if (!DTraceMethodProbes && (probes & DTRACE_METHOD_PROBES)) {
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    set_bool_flag("DTraceMethodProbes", true);
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    changed = true;
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  }
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  if (!DTraceMonitorProbes && (probes & DTRACE_MONITOR_PROBES)) {
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    set_bool_flag("DTraceMonitorProbes", true);
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    changed = true;
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  }
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  if (changed) {
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    // one or more flags changed, need to deoptimize
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    CodeCache::mark_all_nmethods_for_deoptimization();
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    Deoptimization::deoptimize_all_marked();
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  }
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}
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// Disable only the "fine grained" flags. Do *not* touch
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// the overall "ExtendedDTraceProbes" flag.
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void DTrace::disable_dprobes(int probes) {
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  bool changed = false;
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  if (DTraceAllocProbes && (probes & DTRACE_ALLOC_PROBES)) {
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    set_bool_flag("DTraceAllocProbes", false);
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    changed = true;
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  }
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  if (DTraceMethodProbes && (probes & DTRACE_METHOD_PROBES)) {
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    set_bool_flag("DTraceMethodProbes", false);
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    changed = true;
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  }
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  if (DTraceMonitorProbes && (probes & DTRACE_MONITOR_PROBES)) {
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    set_bool_flag("DTraceMonitorProbes", false);
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    changed = true;
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  }
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  if (changed) {
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    // one or more flags changed, need to deoptimize
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    CodeCache::mark_all_nmethods_for_deoptimization();
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    Deoptimization::deoptimize_all_marked();
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  }
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}
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// Do clean-up on "all door clients detached" event.
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void DTrace::detach_all_clients() {
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  /*
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   * We restore the state of the fine grained flags
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   * to be consistent with overall ExtendedDTraceProbes.
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   * This way, we will honour command line setting or the
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   * last explicit modification of ExtendedDTraceProbes by
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   * a call to set_extended_dprobes.
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   */
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  if (ExtendedDTraceProbes) {
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    enable_dprobes(DTRACE_ALL_PROBES);
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  } else {
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    disable_dprobes(DTRACE_ALL_PROBES);
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  }
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}
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void DTrace::set_extended_dprobes(bool flag) {
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  // explicit setting of ExtendedDTraceProbes flag
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  set_bool_flag("ExtendedDTraceProbes", flag);
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  // make sure that the fine grained flags reflect the change.
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  if (flag) {
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    enable_dprobes(DTRACE_ALL_PROBES);
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  } else {
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    /*
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     * FIXME: Revisit this: currently all-client-detach detection
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     * does not work and hence disabled. The following scheme does
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     * not work. So, we have to disable fine-grained flags here.
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     *
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     * disable_dprobes call has to be delayed till next "detach all "event.
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     * This is to be  done so that concurrent DTrace clients that may
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     * have enabled one or more fine grained dprobes and may be running
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     * still. On "detach all" clients event, we would sync ExtendedDTraceProbes
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     * with  fine grained flags which would take care of disabling fine grained flags.
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     */
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    disable_dprobes(DTRACE_ALL_PROBES);
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  }
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}
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void DTrace::set_monitor_dprobes(bool flag) {
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  // explicit setting of DTraceMonitorProbes flag
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  set_bool_flag("DTraceMonitorProbes", flag);
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}
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#endif /* SOLARIS */