author | neliasso |
Mon, 29 Apr 2013 13:20:19 +0200 | |
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parent 13728 | 882756847a04 |
child 18025 | b7bcf7497f93 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2012, 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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||
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#include "precompiled.hpp" |
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#include "code/codeCache.hpp" |
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#include "code/compiledIC.hpp" |
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#include "code/icBuffer.hpp" |
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#include "code/nmethod.hpp" |
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#include "compiler/compileBroker.hpp" |
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#include "memory/resourceArea.hpp" |
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#include "oops/method.hpp" |
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#include "runtime/atomic.hpp" |
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#include "runtime/compilationPolicy.hpp" |
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#include "runtime/mutexLocker.hpp" |
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#include "runtime/os.hpp" |
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#include "runtime/sweeper.hpp" |
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#include "runtime/vm_operations.hpp" |
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#include "utilities/events.hpp" |
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#include "utilities/xmlstream.hpp" |
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#ifdef ASSERT |
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#define SWEEP(nm) record_sweep(nm, __LINE__) |
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// Sweeper logging code |
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class SweeperRecord { |
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public: |
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int traversal; |
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int invocation; |
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int compile_id; |
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long traversal_mark; |
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int state; |
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const char* kind; |
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address vep; |
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address uep; |
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int line; |
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void print() { |
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tty->print_cr("traversal = %d invocation = %d compile_id = %d %s uep = " PTR_FORMAT " vep = " |
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PTR_FORMAT " state = %d traversal_mark %d line = %d", |
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traversal, |
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invocation, |
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compile_id, |
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kind == NULL ? "" : kind, |
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uep, |
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vep, |
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state, |
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traversal_mark, |
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line); |
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} |
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}; |
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static int _sweep_index = 0; |
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static SweeperRecord* _records = NULL; |
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void NMethodSweeper::report_events(int id, address entry) { |
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if (_records != NULL) { |
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for (int i = _sweep_index; i < SweeperLogEntries; i++) { |
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if (_records[i].uep == entry || |
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_records[i].vep == entry || |
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_records[i].compile_id == id) { |
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_records[i].print(); |
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} |
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} |
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for (int i = 0; i < _sweep_index; i++) { |
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if (_records[i].uep == entry || |
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_records[i].vep == entry || |
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_records[i].compile_id == id) { |
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_records[i].print(); |
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} |
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} |
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} |
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} |
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void NMethodSweeper::report_events() { |
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if (_records != NULL) { |
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for (int i = _sweep_index; i < SweeperLogEntries; i++) { |
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// skip empty records |
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if (_records[i].vep == NULL) continue; |
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_records[i].print(); |
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} |
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for (int i = 0; i < _sweep_index; i++) { |
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// skip empty records |
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if (_records[i].vep == NULL) continue; |
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_records[i].print(); |
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} |
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} |
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} |
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void NMethodSweeper::record_sweep(nmethod* nm, int line) { |
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if (_records != NULL) { |
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_records[_sweep_index].traversal = _traversals; |
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_records[_sweep_index].traversal_mark = nm->_stack_traversal_mark; |
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_records[_sweep_index].invocation = _invocations; |
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_records[_sweep_index].compile_id = nm->compile_id(); |
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_records[_sweep_index].kind = nm->compile_kind(); |
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_records[_sweep_index].state = nm->_state; |
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_records[_sweep_index].vep = nm->verified_entry_point(); |
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_records[_sweep_index].uep = nm->entry_point(); |
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_records[_sweep_index].line = line; |
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|
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_sweep_index = (_sweep_index + 1) % SweeperLogEntries; |
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} |
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} |
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#else |
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#define SWEEP(nm) |
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#endif |
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long NMethodSweeper::_traversals = 0; // No. of stack traversals performed |
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nmethod* NMethodSweeper::_current = NULL; // Current nmethod |
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int NMethodSweeper::_seen = 0 ; // No. of nmethods we have currently processed in current pass of CodeCache |
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volatile int NMethodSweeper::_invocations = 0; // No. of invocations left until we are completed with this pass |
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volatile int NMethodSweeper::_sweep_started = 0; // Whether a sweep is in progress. |
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jint NMethodSweeper::_locked_seen = 0; |
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jint NMethodSweeper::_not_entrant_seen_on_stack = 0; |
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bool NMethodSweeper::_resweep = false; |
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jint NMethodSweeper::_flush_token = 0; |
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jlong NMethodSweeper::_last_full_flush_time = 0; |
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int NMethodSweeper::_highest_marked = 0; |
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143 |
int NMethodSweeper::_dead_compile_ids = 0; |
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long NMethodSweeper::_last_flush_traversal_id = 0; |
1 | 145 |
|
3908 | 146 |
class MarkActivationClosure: public CodeBlobClosure { |
147 |
public: |
|
148 |
virtual void do_code_blob(CodeBlob* cb) { |
|
149 |
// If we see an activation belonging to a non_entrant nmethod, we mark it. |
|
150 |
if (cb->is_nmethod() && ((nmethod*)cb)->is_not_entrant()) { |
|
151 |
((nmethod*)cb)->mark_as_seen_on_stack(); |
|
152 |
} |
|
153 |
} |
|
154 |
}; |
|
155 |
static MarkActivationClosure mark_activation_closure; |
|
156 |
||
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bool NMethodSweeper::sweep_in_progress() { |
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158 |
return (_current != NULL); |
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159 |
} |
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160 |
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161 |
void NMethodSweeper::scan_stacks() { |
1 | 162 |
assert(SafepointSynchronize::is_at_safepoint(), "must be executed at a safepoint"); |
163 |
if (!MethodFlushing) return; |
|
164 |
||
165 |
// No need to synchronize access, since this is always executed at a |
|
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166 |
// safepoint. |
1 | 167 |
|
168 |
// Make sure CompiledIC_lock in unlocked, since we might update some |
|
169 |
// inline caches. If it is, we just bail-out and try later. |
|
170 |
if (CompiledIC_lock->is_locked() || Patching_lock->is_locked()) return; |
|
171 |
||
172 |
// Check for restart |
|
173 |
assert(CodeCache::find_blob_unsafe(_current) == _current, "Sweeper nmethod cached state invalid"); |
|
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174 |
if (!sweep_in_progress() && _resweep) { |
1 | 175 |
_seen = 0; |
176 |
_invocations = NmethodSweepFraction; |
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177 |
_current = CodeCache::first_nmethod(); |
1 | 178 |
_traversals += 1; |
179 |
if (PrintMethodFlushing) { |
|
180 |
tty->print_cr("### Sweep: stack traversal %d", _traversals); |
|
181 |
} |
|
3908 | 182 |
Threads::nmethods_do(&mark_activation_closure); |
1 | 183 |
|
184 |
// reset the flags since we started a scan from the beginning. |
|
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185 |
_resweep = false; |
1 | 186 |
_locked_seen = 0; |
187 |
_not_entrant_seen_on_stack = 0; |
|
188 |
} |
|
189 |
||
4750 | 190 |
if (UseCodeCacheFlushing) { |
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191 |
// only allow new flushes after the interval is complete. |
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192 |
jlong now = os::javaTimeMillis(); |
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193 |
jlong max_interval = (jlong)MinCodeCacheFlushingInterval * (jlong)1000; |
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194 |
jlong curr_interval = now - _last_full_flush_time; |
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195 |
if (curr_interval > max_interval) { |
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196 |
_flush_token = 0; |
4750 | 197 |
} |
198 |
||
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199 |
if (!CodeCache::needs_flushing() && !CompileBroker::should_compile_new_jobs()) { |
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200 |
CompileBroker::set_should_compile_new_jobs(CompileBroker::run_compilation); |
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201 |
log_sweep("restart_compiler"); |
4750 | 202 |
} |
203 |
} |
|
1 | 204 |
} |
205 |
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206 |
void NMethodSweeper::possibly_sweep() { |
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207 |
assert(JavaThread::current()->thread_state() == _thread_in_vm, "must run in vm mode"); |
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208 |
if (!MethodFlushing || !sweep_in_progress()) return; |
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209 |
|
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210 |
if (_invocations > 0) { |
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211 |
// Only one thread at a time will sweep |
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212 |
jint old = Atomic::cmpxchg( 1, &_sweep_started, 0 ); |
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213 |
if (old != 0) { |
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214 |
return; |
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215 |
} |
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216 |
#ifdef ASSERT |
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217 |
if (LogSweeper && _records == NULL) { |
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218 |
// Create the ring buffer for the logging code |
13195 | 219 |
_records = NEW_C_HEAP_ARRAY(SweeperRecord, SweeperLogEntries, mtGC); |
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220 |
memset(_records, 0, sizeof(SweeperRecord) * SweeperLogEntries); |
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221 |
} |
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222 |
#endif |
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223 |
if (_invocations > 0) { |
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224 |
sweep_code_cache(); |
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225 |
_invocations--; |
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226 |
} |
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227 |
_sweep_started = 0; |
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228 |
} |
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229 |
} |
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230 |
|
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231 |
void NMethodSweeper::sweep_code_cache() { |
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232 |
#ifdef ASSERT |
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233 |
jlong sweep_start; |
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234 |
if (PrintMethodFlushing) { |
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|
235 |
sweep_start = os::javaTimeMillis(); |
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|
236 |
} |
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|
237 |
#endif |
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|
238 |
if (PrintMethodFlushing && Verbose) { |
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239 |
tty->print_cr("### Sweep at %d out of %d. Invocations left: %d", _seen, CodeCache::nof_nmethods(), _invocations); |
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240 |
} |
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|
241 |
|
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242 |
if (!CompileBroker::should_compile_new_jobs()) { |
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243 |
// If we have turned off compilations we might as well do full sweeps |
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244 |
// in order to reach the clean state faster. Otherwise the sleeping compiler |
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245 |
// threads will slow down sweeping. After a few iterations the cache |
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246 |
// will be clean and sweeping stops (_resweep will not be set) |
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247 |
_invocations = 1; |
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248 |
} |
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249 |
|
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250 |
// We want to visit all nmethods after NmethodSweepFraction |
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251 |
// invocations so divide the remaining number of nmethods by the |
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252 |
// remaining number of invocations. This is only an estimate since |
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253 |
// the number of nmethods changes during the sweep so the final |
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254 |
// stage must iterate until it there are no more nmethods. |
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255 |
int todo = (CodeCache::nof_nmethods() - _seen) / _invocations; |
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256 |
|
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257 |
assert(!SafepointSynchronize::is_at_safepoint(), "should not be in safepoint when we get here"); |
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|
258 |
assert(!CodeCache_lock->owned_by_self(), "just checking"); |
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|
259 |
|
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|
260 |
{ |
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|
261 |
MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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|
262 |
|
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263 |
// The last invocation iterates until there are no more nmethods |
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264 |
for (int i = 0; (i < todo || _invocations == 1) && _current != NULL; i++) { |
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265 |
if (SafepointSynchronize::is_synchronizing()) { // Safepoint request |
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266 |
if (PrintMethodFlushing && Verbose) { |
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|
267 |
tty->print_cr("### Sweep at %d out of %d, invocation: %d, yielding to safepoint", _seen, CodeCache::nof_nmethods(), _invocations); |
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268 |
} |
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269 |
MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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270 |
|
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271 |
assert(Thread::current()->is_Java_thread(), "should be java thread"); |
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272 |
JavaThread* thread = (JavaThread*)Thread::current(); |
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273 |
ThreadBlockInVM tbivm(thread); |
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274 |
thread->java_suspend_self(); |
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275 |
} |
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276 |
// Since we will give up the CodeCache_lock, always skip ahead |
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277 |
// to the next nmethod. Other blobs can be deleted by other |
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278 |
// threads but nmethods are only reclaimed by the sweeper. |
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279 |
nmethod* next = CodeCache::next_nmethod(_current); |
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280 |
|
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281 |
// Now ready to process nmethod and give up CodeCache_lock |
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282 |
{ |
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283 |
MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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284 |
process_nmethod(_current); |
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285 |
} |
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286 |
_seen++; |
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287 |
_current = next; |
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288 |
} |
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289 |
} |
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290 |
|
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291 |
assert(_invocations > 1 || _current == NULL, "must have scanned the whole cache"); |
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292 |
|
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293 |
if (!sweep_in_progress() && !_resweep && (_locked_seen || _not_entrant_seen_on_stack)) { |
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294 |
// we've completed a scan without making progress but there were |
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295 |
// nmethods we were unable to process either because they were |
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296 |
// locked or were still on stack. We don't have to aggresively |
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297 |
// clean them up so just stop scanning. We could scan once more |
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|
298 |
// but that complicates the control logic and it's unlikely to |
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|
299 |
// matter much. |
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|
300 |
if (PrintMethodFlushing) { |
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301 |
tty->print_cr("### Couldn't make progress on some nmethods so stopping sweep"); |
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302 |
} |
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|
303 |
} |
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|
304 |
|
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|
305 |
#ifdef ASSERT |
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|
306 |
if(PrintMethodFlushing) { |
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|
307 |
jlong sweep_end = os::javaTimeMillis(); |
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|
308 |
tty->print_cr("### sweeper: sweep time(%d): " INT64_FORMAT, _invocations, sweep_end - sweep_start); |
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309 |
} |
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310 |
#endif |
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311 |
|
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312 |
if (_invocations == 1) { |
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313 |
log_sweep("finished"); |
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314 |
} |
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315 |
|
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316 |
// Sweeper is the only case where memory is released, |
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317 |
// check here if it is time to restart the compiler. |
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318 |
if (UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs() && !CodeCache::needs_flushing()) { |
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319 |
CompileBroker::set_should_compile_new_jobs(CompileBroker::run_compilation); |
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320 |
log_sweep("restart_compiler"); |
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321 |
} |
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322 |
} |
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323 |
|
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324 |
class NMethodMarker: public StackObj { |
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325 |
private: |
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|
326 |
CompilerThread* _thread; |
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327 |
public: |
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328 |
NMethodMarker(nmethod* nm) { |
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329 |
_thread = CompilerThread::current(); |
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330 |
if (!nm->is_zombie() && !nm->is_unloaded()) { |
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331 |
// Only expose live nmethods for scanning |
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332 |
_thread->set_scanned_nmethod(nm); |
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333 |
} |
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334 |
} |
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335 |
~NMethodMarker() { |
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336 |
_thread->set_scanned_nmethod(NULL); |
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|
337 |
} |
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|
338 |
}; |
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|
339 |
|
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340 |
void NMethodSweeper::release_nmethod(nmethod *nm) { |
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341 |
// Clean up any CompiledICHolders |
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342 |
{ |
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|
343 |
ResourceMark rm; |
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|
344 |
MutexLocker ml_patch(CompiledIC_lock); |
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|
345 |
RelocIterator iter(nm); |
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|
346 |
while (iter.next()) { |
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|
347 |
if (iter.type() == relocInfo::virtual_call_type) { |
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|
348 |
CompiledIC::cleanup_call_site(iter.virtual_call_reloc()); |
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|
349 |
} |
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|
350 |
} |
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|
351 |
} |
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|
352 |
|
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|
353 |
MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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|
354 |
nm->flush(); |
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355 |
} |
1 | 356 |
|
357 |
void NMethodSweeper::process_nmethod(nmethod *nm) { |
|
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|
358 |
assert(!CodeCache_lock->owned_by_self(), "just checking"); |
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|
359 |
|
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|
360 |
// Make sure this nmethod doesn't get unloaded during the scan, |
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|
361 |
// since the locks acquired below might safepoint. |
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|
362 |
NMethodMarker nmm(nm); |
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|
363 |
|
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|
364 |
SWEEP(nm); |
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|
365 |
|
1 | 366 |
// Skip methods that are currently referenced by the VM |
367 |
if (nm->is_locked_by_vm()) { |
|
368 |
// But still remember to clean-up inline caches for alive nmethods |
|
369 |
if (nm->is_alive()) { |
|
370 |
// Clean-up all inline caches that points to zombie/non-reentrant methods |
|
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|
371 |
MutexLocker cl(CompiledIC_lock); |
1 | 372 |
nm->cleanup_inline_caches(); |
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|
373 |
SWEEP(nm); |
1 | 374 |
} else { |
375 |
_locked_seen++; |
|
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|
376 |
SWEEP(nm); |
1 | 377 |
} |
378 |
return; |
|
379 |
} |
|
380 |
||
381 |
if (nm->is_zombie()) { |
|
382 |
// If it is first time, we see nmethod then we mark it. Otherwise, |
|
383 |
// we reclame it. When we have seen a zombie method twice, we know that |
|
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|
384 |
// there are no inline caches that refer to it. |
1 | 385 |
if (nm->is_marked_for_reclamation()) { |
386 |
assert(!nm->is_locked_by_vm(), "must not flush locked nmethods"); |
|
3696 | 387 |
if (PrintMethodFlushing && Verbose) { |
4750 | 388 |
tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (marked for reclamation) being flushed", nm->compile_id(), nm); |
3696 | 389 |
} |
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|
390 |
release_nmethod(nm); |
1 | 391 |
} else { |
3696 | 392 |
if (PrintMethodFlushing && Verbose) { |
4750 | 393 |
tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (zombie) being marked for reclamation", nm->compile_id(), nm); |
3696 | 394 |
} |
1 | 395 |
nm->mark_for_reclamation(); |
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|
396 |
_resweep = true; |
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|
397 |
SWEEP(nm); |
1 | 398 |
} |
399 |
} else if (nm->is_not_entrant()) { |
|
400 |
// If there is no current activations of this method on the |
|
401 |
// stack we can safely convert it to a zombie method |
|
402 |
if (nm->can_not_entrant_be_converted()) { |
|
3696 | 403 |
if (PrintMethodFlushing && Verbose) { |
4750 | 404 |
tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (not entrant) being made zombie", nm->compile_id(), nm); |
3696 | 405 |
} |
1 | 406 |
nm->make_zombie(); |
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|
407 |
_resweep = true; |
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|
408 |
SWEEP(nm); |
1 | 409 |
} else { |
410 |
// Still alive, clean up its inline caches |
|
5533
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|
411 |
MutexLocker cl(CompiledIC_lock); |
1 | 412 |
nm->cleanup_inline_caches(); |
413 |
// we coudn't transition this nmethod so don't immediately |
|
414 |
// request a rescan. If this method stays on the stack for a |
|
5533
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|
415 |
// long time we don't want to keep rescanning the code cache. |
1 | 416 |
_not_entrant_seen_on_stack++; |
9942
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|
417 |
SWEEP(nm); |
1 | 418 |
} |
419 |
} else if (nm->is_unloaded()) { |
|
420 |
// Unloaded code, just make it a zombie |
|
3696 | 421 |
if (PrintMethodFlushing && Verbose) |
4750 | 422 |
tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (unloaded) being made zombie", nm->compile_id(), nm); |
3696 | 423 |
if (nm->is_osr_method()) { |
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|
424 |
SWEEP(nm); |
1 | 425 |
// No inline caches will ever point to osr methods, so we can just remove it |
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|
426 |
release_nmethod(nm); |
1 | 427 |
} else { |
428 |
nm->make_zombie(); |
|
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|
429 |
_resweep = true; |
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|
430 |
SWEEP(nm); |
1 | 431 |
} |
432 |
} else { |
|
433 |
assert(nm->is_alive(), "should be alive"); |
|
4750 | 434 |
|
435 |
if (UseCodeCacheFlushing) { |
|
17132
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|
436 |
if (nm->is_speculatively_disconnected() && !nm->is_locked_by_vm() && !nm->is_osr_method() && |
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|
437 |
(_traversals > _last_flush_traversal_id + 2) && (nm->compile_id() < _highest_marked)) { |
4750 | 438 |
// This method has not been called since the forced cleanup happened |
439 |
nm->make_not_entrant(); |
|
440 |
} |
|
441 |
} |
|
442 |
||
1 | 443 |
// Clean-up all inline caches that points to zombie/non-reentrant methods |
5533
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|
444 |
MutexLocker cl(CompiledIC_lock); |
1 | 445 |
nm->cleanup_inline_caches(); |
9942
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|
446 |
SWEEP(nm); |
1 | 447 |
} |
448 |
} |
|
4750 | 449 |
|
450 |
// Code cache unloading: when compilers notice the code cache is getting full, |
|
451 |
// they will call a vm op that comes here. This code attempts to speculatively |
|
452 |
// unload the oldest half of the nmethods (based on the compile job id) by |
|
453 |
// saving the old code in a list in the CodeCache. Then |
|
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|
454 |
// execution resumes. If a method so marked is not called by the second sweeper |
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|
455 |
// stack traversal after the current one, the nmethod will be marked non-entrant and |
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|
456 |
// got rid of by normal sweeping. If the method is called, the Method*'s |
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|
457 |
// _code field is restored and the Method*/nmethod |
4750 | 458 |
// go back to their normal state. |
459 |
void NMethodSweeper::handle_full_code_cache(bool is_full) { |
|
460 |
||
461 |
if (is_full) { |
|
462 |
// Since code cache is full, immediately stop new compiles |
|
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|
463 |
if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) { |
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|
464 |
log_sweep("disable_compiler"); |
4750 | 465 |
} |
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|
466 |
} |
4750 | 467 |
|
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|
468 |
// Make sure only one thread can flush |
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|
469 |
// The token is reset after CodeCacheMinimumFlushInterval in scan stacks, |
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|
470 |
// no need to check the timeout here. |
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|
471 |
jint old = Atomic::cmpxchg( 1, &_flush_token, 0 ); |
dffd513b2a8c
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|
472 |
if (old != 0) { |
dffd513b2a8c
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|
473 |
return; |
4750 | 474 |
} |
475 |
||
476 |
VM_HandleFullCodeCache op(is_full); |
|
477 |
VMThread::execute(&op); |
|
478 |
||
17132
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|
479 |
// resweep again as soon as possible |
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|
480 |
_resweep = true; |
4750 | 481 |
} |
482 |
||
483 |
void NMethodSweeper::speculative_disconnect_nmethods(bool is_full) { |
|
484 |
// If there was a race in detecting full code cache, only run |
|
485 |
// one vm op for it or keep the compiler shut off |
|
486 |
||
487 |
debug_only(jlong start = os::javaTimeMillis();) |
|
488 |
||
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|
489 |
// Traverse the code cache trying to dump the oldest nmethods |
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|
490 |
int curr_max_comp_id = CompileBroker::get_compilation_id(); |
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|
491 |
int flush_target = ((curr_max_comp_id - _dead_compile_ids) / CodeCacheFlushingFraction) + _dead_compile_ids; |
4750 | 492 |
|
5924
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|
493 |
log_sweep("start_cleaning"); |
4750 | 494 |
|
495 |
nmethod* nm = CodeCache::alive_nmethod(CodeCache::first()); |
|
496 |
jint disconnected = 0; |
|
497 |
jint made_not_entrant = 0; |
|
17132
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|
498 |
jint nmethod_count = 0; |
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|
499 |
|
4750 | 500 |
while ((nm != NULL)){ |
17132
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|
501 |
int curr_comp_id = nm->compile_id(); |
4750 | 502 |
|
503 |
// OSR methods cannot be flushed like this. Also, don't flush native methods |
|
504 |
// since they are part of the JDK in most cases |
|
17132
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|
505 |
if (!nm->is_osr_method() && !nm->is_locked_by_vm() && !nm->is_native_method()) { |
dffd513b2a8c
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changeset
|
506 |
|
dffd513b2a8c
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changeset
|
507 |
// only count methods that can be speculatively disconnected |
dffd513b2a8c
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changeset
|
508 |
nmethod_count++; |
4750 | 509 |
|
17132
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changeset
|
510 |
if (nm->is_in_use() && (curr_comp_id < flush_target)) { |
dffd513b2a8c
8012547: Code cache flushing can get stuck reclaming of memory
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changeset
|
511 |
if ((nm->method()->code() == nm)) { |
dffd513b2a8c
8012547: Code cache flushing can get stuck reclaming of memory
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changeset
|
512 |
// This method has not been previously considered for |
dffd513b2a8c
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changeset
|
513 |
// unloading or it was restored already |
dffd513b2a8c
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changeset
|
514 |
CodeCache::speculatively_disconnect(nm); |
dffd513b2a8c
8012547: Code cache flushing can get stuck reclaming of memory
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diff
changeset
|
515 |
disconnected++; |
dffd513b2a8c
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changeset
|
516 |
} else if (nm->is_speculatively_disconnected()) { |
dffd513b2a8c
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changeset
|
517 |
// This method was previously considered for preemptive unloading and was not called since then |
dffd513b2a8c
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changeset
|
518 |
CompilationPolicy::policy()->delay_compilation(nm->method()); |
dffd513b2a8c
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changeset
|
519 |
nm->make_not_entrant(); |
dffd513b2a8c
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changeset
|
520 |
made_not_entrant++; |
dffd513b2a8c
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changeset
|
521 |
} |
4750 | 522 |
|
17132
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changeset
|
523 |
if (curr_comp_id > _highest_marked) { |
dffd513b2a8c
8012547: Code cache flushing can get stuck reclaming of memory
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parents:
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diff
changeset
|
524 |
_highest_marked = curr_comp_id; |
dffd513b2a8c
8012547: Code cache flushing can get stuck reclaming of memory
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changeset
|
525 |
} |
4750 | 526 |
} |
527 |
} |
|
528 |
nm = CodeCache::alive_nmethod(CodeCache::next(nm)); |
|
529 |
} |
|
530 |
||
17132
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changeset
|
531 |
// remember how many compile_ids wheren't seen last flush. |
dffd513b2a8c
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parents:
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diff
changeset
|
532 |
_dead_compile_ids = curr_max_comp_id - nmethod_count; |
dffd513b2a8c
8012547: Code cache flushing can get stuck reclaming of memory
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parents:
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diff
changeset
|
533 |
|
5924
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
534 |
log_sweep("stop_cleaning", |
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
535 |
"disconnected='" UINT32_FORMAT "' made_not_entrant='" UINT32_FORMAT "'", |
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
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parents:
5895
diff
changeset
|
536 |
disconnected, made_not_entrant); |
4750 | 537 |
|
5533
e8d9ff82ec62
6950075: nmethod sweeper should operate concurrently
never
parents:
4750
diff
changeset
|
538 |
// Shut off compiler. Sweeper will start over with a new stack scan and |
e8d9ff82ec62
6950075: nmethod sweeper should operate concurrently
never
parents:
4750
diff
changeset
|
539 |
// traversal cycle and turn it back on if it clears enough space. |
17132
dffd513b2a8c
8012547: Code cache flushing can get stuck reclaming of memory
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parents:
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diff
changeset
|
540 |
if (is_full) { |
dffd513b2a8c
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neliasso
parents:
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diff
changeset
|
541 |
_last_full_flush_time = os::javaTimeMillis(); |
4750 | 542 |
} |
543 |
||
544 |
// After two more traversals the sweeper will get rid of unrestored nmethods |
|
17132
dffd513b2a8c
8012547: Code cache flushing can get stuck reclaming of memory
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parents:
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diff
changeset
|
545 |
_last_flush_traversal_id = _traversals; |
dffd513b2a8c
8012547: Code cache flushing can get stuck reclaming of memory
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diff
changeset
|
546 |
_resweep = true; |
4750 | 547 |
#ifdef ASSERT |
548 |
jlong end = os::javaTimeMillis(); |
|
549 |
if(PrintMethodFlushing && Verbose) { |
|
550 |
tty->print_cr("### sweeper: unload time: " INT64_FORMAT, end-start); |
|
551 |
} |
|
552 |
#endif |
|
553 |
} |
|
5924
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
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parents:
5895
diff
changeset
|
554 |
|
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
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parents:
5895
diff
changeset
|
555 |
|
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
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parents:
5895
diff
changeset
|
556 |
// Print out some state information about the current sweep and the |
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
557 |
// state of the code cache if it's requested. |
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
558 |
void NMethodSweeper::log_sweep(const char* msg, const char* format, ...) { |
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
559 |
if (PrintMethodFlushing) { |
9138
35e4b04eadf4
7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents:
8921
diff
changeset
|
560 |
stringStream s; |
35e4b04eadf4
7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents:
8921
diff
changeset
|
561 |
// Dump code cache state into a buffer before locking the tty, |
35e4b04eadf4
7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents:
8921
diff
changeset
|
562 |
// because log_state() will use locks causing lock conflicts. |
35e4b04eadf4
7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents:
8921
diff
changeset
|
563 |
CodeCache::log_state(&s); |
35e4b04eadf4
7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents:
8921
diff
changeset
|
564 |
|
5924
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
565 |
ttyLocker ttyl; |
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
566 |
tty->print("### sweeper: %s ", msg); |
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
567 |
if (format != NULL) { |
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
568 |
va_list ap; |
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
569 |
va_start(ap, format); |
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
570 |
tty->vprint(format, ap); |
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
571 |
va_end(ap); |
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
572 |
} |
9138
35e4b04eadf4
7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents:
8921
diff
changeset
|
573 |
tty->print_cr(s.as_string()); |
5924
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
574 |
} |
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
575 |
|
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
576 |
if (LogCompilation && (xtty != NULL)) { |
9138
35e4b04eadf4
7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents:
8921
diff
changeset
|
577 |
stringStream s; |
35e4b04eadf4
7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents:
8921
diff
changeset
|
578 |
// Dump code cache state into a buffer before locking the tty, |
35e4b04eadf4
7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents:
8921
diff
changeset
|
579 |
// because log_state() will use locks causing lock conflicts. |
35e4b04eadf4
7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents:
8921
diff
changeset
|
580 |
CodeCache::log_state(&s); |
35e4b04eadf4
7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents:
8921
diff
changeset
|
581 |
|
5924
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
582 |
ttyLocker ttyl; |
5926 | 583 |
xtty->begin_elem("sweeper state='%s' traversals='" INTX_FORMAT "' ", msg, (intx)traversal_count()); |
5924
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
584 |
if (format != NULL) { |
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
585 |
va_list ap; |
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
586 |
va_start(ap, format); |
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
587 |
xtty->vprint(format, ap); |
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
588 |
va_end(ap); |
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
589 |
} |
9138
35e4b04eadf4
7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents:
8921
diff
changeset
|
590 |
xtty->print(s.as_string()); |
5924
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
591 |
xtty->stamp(); |
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
592 |
xtty->end_elem(); |
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
593 |
} |
dc9d04930c82
6965184: possible races in make_not_entrant_or_zombie
never
parents:
5895
diff
changeset
|
594 |
} |