Mercurial > hg > graal-compiler
view src/share/vm/services/dtraceAttacher.cpp @ 2149:7e37af9d69ef
7011379: G1: overly long concurrent marking cycles
Summary: This changeset introduces filtering of SATB buffers at the point when they are about to be enqueued. If this filtering clears enough entries on each buffer, the buffer can then be re-used and not enqueued. This cuts down the number of SATB buffers that need to be processed by the concurrent marking threads.
Reviewed-by: johnc, ysr
author | tonyp |
---|---|
date | Wed, 19 Jan 2011 09:35:17 -0500 |
parents | f95d63e2154a |
children | 72b7e96c1922 |
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/* * Copyright (c) 2006, 2010, 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, 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 */