truffle: src/share/vm/runtime/sweeper.cpp annotate

annotate src/share/vm/runtime/sweeper.cpp @ 2426:1d1603768966

7010070: Update all 2010 Oracle-changed OpenJDK files to have the proper copyright dates - second pass Summary: Update the copyright to be 2010 on all changed files in OpenJDK Reviewed-by: ohair

author	trims
date	Tue, 05 Apr 2011 14:12:31 -0700
parents	1c0cf339481b
children	dbccacb79c63

rev	line source
0 a61af66fc99e Initial load duke parents: diff changeset	1 /*
2426 1d1603768966 7010070: Update all 2010 Oracle-changed OpenJDK files to have the proper copyright dates - second pass trims parents: 2353 diff changeset	2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
0 a61af66fc99e Initial load duke parents: diff changeset	3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
a61af66fc99e Initial load duke parents: diff changeset	4 *
a61af66fc99e Initial load duke parents: diff changeset	5 * This code is free software; you can redistribute it and/or modify it
a61af66fc99e Initial load duke parents: diff changeset	6 * under the terms of the GNU General Public License version 2 only, as
a61af66fc99e Initial load duke parents: diff changeset	7 * published by the Free Software Foundation.
a61af66fc99e Initial load duke parents: diff changeset	8 *
a61af66fc99e Initial load duke parents: diff changeset	9 * This code is distributed in the hope that it will be useful, but WITHOUT
a61af66fc99e Initial load duke parents: diff changeset	10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
a61af66fc99e Initial load duke parents: diff changeset	11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
a61af66fc99e Initial load duke parents: diff changeset	12 * version 2 for more details (a copy is included in the LICENSE file that
a61af66fc99e Initial load duke parents: diff changeset	13 * accompanied this code).
a61af66fc99e Initial load duke parents: diff changeset	14 *
a61af66fc99e Initial load duke parents: diff changeset	15 * You should have received a copy of the GNU General Public License version
a61af66fc99e Initial load duke parents: diff changeset	16 * 2 along with this work; if not, write to the Free Software Foundation,
a61af66fc99e Initial load duke parents: diff changeset	17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
a61af66fc99e Initial load duke parents: diff changeset	18 *
1552 c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1538 diff changeset	19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1538 diff changeset	20 * or visit www.oracle.com if you need additional information or have any
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1538 diff changeset	21 * questions.
0 a61af66fc99e Initial load duke parents: diff changeset	22 *
a61af66fc99e Initial load duke parents: diff changeset	23 */
a61af66fc99e Initial load duke parents: diff changeset	24
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1783 diff changeset	25 #include "precompiled.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1783 diff changeset	26 #include "code/codeCache.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1783 diff changeset	27 #include "code/nmethod.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1783 diff changeset	28 #include "compiler/compileBroker.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1783 diff changeset	29 #include "memory/resourceArea.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1783 diff changeset	30 #include "oops/methodOop.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1783 diff changeset	31 #include "runtime/atomic.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1783 diff changeset	32 #include "runtime/compilationPolicy.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1783 diff changeset	33 #include "runtime/mutexLocker.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1783 diff changeset	34 #include "runtime/os.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1783 diff changeset	35 #include "runtime/sweeper.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1783 diff changeset	36 #include "runtime/vm_operations.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1783 diff changeset	37 #include "utilities/events.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1783 diff changeset	38 #include "utilities/xmlstream.hpp"
0 a61af66fc99e Initial load duke parents: diff changeset	39
a61af66fc99e Initial load duke parents: diff changeset	40 long NMethodSweeper::_traversals = 0; // No. of stack traversals performed
1615 ff38d05ea86f 6956958: assert(is_clean() \|\| is_call_to_compiled() \|\| is_call_to_interpreted() \|\| is_optimized() \|\| is_megam never parents: 1552 diff changeset	41 nmethod* NMethodSweeper::_current = NULL; // Current nmethod
1644 2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	42 int NMethodSweeper::_seen = 0 ; // No. of nmethods we have currently processed in current pass of CodeCache
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	43
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	44 volatile int NMethodSweeper::_invocations = 0; // No. of invocations left until we are completed with this pass
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	45 volatile int NMethodSweeper::_sweep_started = 0; // Whether a sweep is in progress.
0 a61af66fc99e Initial load duke parents: diff changeset	46
a61af66fc99e Initial load duke parents: diff changeset	47 jint NMethodSweeper::_locked_seen = 0;
a61af66fc99e Initial load duke parents: diff changeset	48 jint NMethodSweeper::_not_entrant_seen_on_stack = 0;
a61af66fc99e Initial load duke parents: diff changeset	49 bool NMethodSweeper::_rescan = false;
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	50 bool NMethodSweeper::_do_sweep = false;
1202 5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	51 bool NMethodSweeper::_was_full = false;
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	52 jint NMethodSweeper::_advise_to_sweep = 0;
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	53 jlong NMethodSweeper::_last_was_full = 0;
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	54 uint NMethodSweeper::_highest_marked = 0;
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	55 long NMethodSweeper::_was_full_traversal = 0;
0 a61af66fc99e Initial load duke parents: diff changeset	56
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 0 diff changeset	57 class MarkActivationClosure: public CodeBlobClosure {
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 0 diff changeset	58 public:
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 0 diff changeset	59 virtual void do_code_blob(CodeBlob* cb) {
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 0 diff changeset	60 // If we see an activation belonging to a non_entrant nmethod, we mark it.
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 0 diff changeset	61 if (cb->is_nmethod() && ((nmethod*)cb)->is_not_entrant()) {
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 0 diff changeset	62 ((nmethod*)cb)->mark_as_seen_on_stack();
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 0 diff changeset	63 }
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 0 diff changeset	64 }
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 0 diff changeset	65 };
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 0 diff changeset	66 static MarkActivationClosure mark_activation_closure;
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 0 diff changeset	67
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	68 void NMethodSweeper::scan_stacks() {
0 a61af66fc99e Initial load duke parents: diff changeset	69 assert(SafepointSynchronize::is_at_safepoint(), "must be executed at a safepoint");
a61af66fc99e Initial load duke parents: diff changeset	70 if (!MethodFlushing) return;
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	71 _do_sweep = true;
0 a61af66fc99e Initial load duke parents: diff changeset	72
a61af66fc99e Initial load duke parents: diff changeset	73 // No need to synchronize access, since this is always executed at a
a61af66fc99e Initial load duke parents: diff changeset	74 // safepoint. If we aren't in the middle of scan and a rescan
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	75 // hasn't been requested then just return. If UseCodeCacheFlushing is on and
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	76 // code cache flushing is in progress, don't skip sweeping to help make progress
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	77 // clearing space in the code cache.
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	78 if ((_current == NULL && !_rescan) && !(UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs())) {
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	79 _do_sweep = false;
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	80 return;
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	81 }
0 a61af66fc99e Initial load duke parents: diff changeset	82
a61af66fc99e Initial load duke parents: diff changeset	83 // Make sure CompiledIC_lock in unlocked, since we might update some
a61af66fc99e Initial load duke parents: diff changeset	84 // inline caches. If it is, we just bail-out and try later.
a61af66fc99e Initial load duke parents: diff changeset	85 if (CompiledIC_lock->is_locked() \|\| Patching_lock->is_locked()) return;
a61af66fc99e Initial load duke parents: diff changeset	86
a61af66fc99e Initial load duke parents: diff changeset	87 // Check for restart
a61af66fc99e Initial load duke parents: diff changeset	88 assert(CodeCache::find_blob_unsafe(_current) == _current, "Sweeper nmethod cached state invalid");
a61af66fc99e Initial load duke parents: diff changeset	89 if (_current == NULL) {
a61af66fc99e Initial load duke parents: diff changeset	90 _seen = 0;
a61af66fc99e Initial load duke parents: diff changeset	91 _invocations = NmethodSweepFraction;
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	92 _current = CodeCache::first_nmethod();
0 a61af66fc99e Initial load duke parents: diff changeset	93 _traversals += 1;
a61af66fc99e Initial load duke parents: diff changeset	94 if (PrintMethodFlushing) {
a61af66fc99e Initial load duke parents: diff changeset	95 tty->print_cr("### Sweep: stack traversal %d", _traversals);
a61af66fc99e Initial load duke parents: diff changeset	96 }
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 0 diff changeset	97 Threads::nmethods_do(&mark_activation_closure);
0 a61af66fc99e Initial load duke parents: diff changeset	98
a61af66fc99e Initial load duke parents: diff changeset	99 // reset the flags since we started a scan from the beginning.
a61af66fc99e Initial load duke parents: diff changeset	100 _rescan = false;
a61af66fc99e Initial load duke parents: diff changeset	101 _locked_seen = 0;
a61af66fc99e Initial load duke parents: diff changeset	102 _not_entrant_seen_on_stack = 0;
a61af66fc99e Initial load duke parents: diff changeset	103 }
a61af66fc99e Initial load duke parents: diff changeset	104
1202 5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	105 if (UseCodeCacheFlushing) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	106 if (!CodeCache::needs_flushing()) {
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	107 // scan_stacks() runs during a safepoint, no race with setters
1202 5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	108 _advise_to_sweep = 0;
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	109 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	110
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	111 if (was_full()) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	112 // There was some progress so attempt to restart the compiler
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	113 jlong now = os::javaTimeMillis();
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	114 jlong max_interval = (jlong)MinCodeCacheFlushingInterval * (jlong)1000;
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	115 jlong curr_interval = now - _last_was_full;
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	116 if ((!CodeCache::needs_flushing()) && (curr_interval > max_interval)) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	117 CompileBroker::set_should_compile_new_jobs(CompileBroker::run_compilation);
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	118 set_was_full(false);
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	119
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	120 // Update the _last_was_full time so we can tell how fast the
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	121 // code cache is filling up
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	122 _last_was_full = os::javaTimeMillis();
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	123
1644 2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	124 log_sweep("restart_compiler");
1202 5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	125 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	126 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	127 }
0 a61af66fc99e Initial load duke parents: diff changeset	128 }
a61af66fc99e Initial load duke parents: diff changeset	129
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	130 void NMethodSweeper::possibly_sweep() {
1644 2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	131 assert(JavaThread::current()->thread_state() == _thread_in_vm, "must run in vm mode");
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	132 if ((!MethodFlushing) \|\| (!_do_sweep)) return;
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	133
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	134 if (_invocations > 0) {
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	135 // Only one thread at a time will sweep
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	136 jint old = Atomic::cmpxchg( 1, &_sweep_started, 0 );
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	137 if (old != 0) {
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	138 return;
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	139 }
1644 2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	140 if (_invocations > 0) {
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	141 sweep_code_cache();
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	142 _invocations--;
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	143 }
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	144 _sweep_started = 0;
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	145 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	146 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	147
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	148 void NMethodSweeper::sweep_code_cache() {
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	149 #ifdef ASSERT
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	150 jlong sweep_start;
1644 2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	151 if (PrintMethodFlushing) {
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	152 sweep_start = os::javaTimeMillis();
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	153 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	154 #endif
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	155 if (PrintMethodFlushing && Verbose) {
1644 2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	156 tty->print_cr("### Sweep at %d out of %d. Invocations left: %d", _seen, CodeCache::nof_nmethods(), _invocations);
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	157 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	158
1644 2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	159 // We want to visit all nmethods after NmethodSweepFraction
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	160 // invocations so divide the remaining number of nmethods by the
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	161 // remaining number of invocations. This is only an estimate since
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	162 // the number of nmethods changes during the sweep so the final
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	163 // stage must iterate until it there are no more nmethods.
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	164 int todo = (CodeCache::nof_nmethods() - _seen) / _invocations;
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	165
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	166 assert(!SafepointSynchronize::is_at_safepoint(), "should not be in safepoint when we get here");
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	167 assert(!CodeCache_lock->owned_by_self(), "just checking");
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	168
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	169 {
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	170 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	171
1644 2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	172 // The last invocation iterates until there are no more nmethods
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	173 for (int i = 0; (i < todo \|\| _invocations == 1) && _current != NULL; i++) {
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	174
1644 2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	175 // Since we will give up the CodeCache_lock, always skip ahead
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	176 // to the next nmethod. Other blobs can be deleted by other
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	177 // threads but nmethods are only reclaimed by the sweeper.
1615 ff38d05ea86f 6956958: assert(is_clean() \|\| is_call_to_compiled() \|\| is_call_to_interpreted() \|\| is_optimized() \|\| is_megam never parents: 1552 diff changeset	178 nmethod* next = CodeCache::next_nmethod(_current);
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	179
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	180 // Now ready to process nmethod and give up CodeCache_lock
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	181 {
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	182 MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1615 ff38d05ea86f 6956958: assert(is_clean() \|\| is_call_to_compiled() \|\| is_call_to_interpreted() \|\| is_optimized() \|\| is_megam never parents: 1552 diff changeset	183 process_nmethod(_current);
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	184 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	185 _seen++;
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	186 _current = next;
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	187 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	188 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	189
1644 2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	190 assert(_invocations > 1 \|\| _current == NULL, "must have scanned the whole cache");
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	191
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	192 if (_current == NULL && !_rescan && (_locked_seen \|\| _not_entrant_seen_on_stack)) {
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	193 // we've completed a scan without making progress but there were
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	194 // nmethods we were unable to process either because they were
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	195 // locked or were still on stack. We don't have to aggresively
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	196 // clean them up so just stop scanning. We could scan once more
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	197 // but that complicates the control logic and it's unlikely to
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	198 // matter much.
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	199 if (PrintMethodFlushing) {
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	200 tty->print_cr("### Couldn't make progress on some nmethods so stopping sweep");
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	201 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	202 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	203
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	204 #ifdef ASSERT
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	205 if(PrintMethodFlushing) {
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	206 jlong sweep_end = os::javaTimeMillis();
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	207 tty->print_cr("### sweeper: sweep time(%d): " INT64_FORMAT, _invocations, sweep_end - sweep_start);
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	208 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	209 #endif
1644 2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	210
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	211 if (_invocations == 1) {
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	212 log_sweep("finished");
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	213 }
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	214 }
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	215
0 a61af66fc99e Initial load duke parents: diff changeset	216
a61af66fc99e Initial load duke parents: diff changeset	217 void NMethodSweeper::process_nmethod(nmethod *nm) {
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	218 assert(!CodeCache_lock->owned_by_self(), "just checking");
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	219
0 a61af66fc99e Initial load duke parents: diff changeset	220 // Skip methods that are currently referenced by the VM
a61af66fc99e Initial load duke parents: diff changeset	221 if (nm->is_locked_by_vm()) {
a61af66fc99e Initial load duke parents: diff changeset	222 // But still remember to clean-up inline caches for alive nmethods
a61af66fc99e Initial load duke parents: diff changeset	223 if (nm->is_alive()) {
a61af66fc99e Initial load duke parents: diff changeset	224 // Clean-up all inline caches that points to zombie/non-reentrant methods
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	225 MutexLocker cl(CompiledIC_lock);
0 a61af66fc99e Initial load duke parents: diff changeset	226 nm->cleanup_inline_caches();
a61af66fc99e Initial load duke parents: diff changeset	227 } else {
a61af66fc99e Initial load duke parents: diff changeset	228 _locked_seen++;
a61af66fc99e Initial load duke parents: diff changeset	229 }
a61af66fc99e Initial load duke parents: diff changeset	230 return;
a61af66fc99e Initial load duke parents: diff changeset	231 }
a61af66fc99e Initial load duke parents: diff changeset	232
a61af66fc99e Initial load duke parents: diff changeset	233 if (nm->is_zombie()) {
a61af66fc99e Initial load duke parents: diff changeset	234 // If it is first time, we see nmethod then we mark it. Otherwise,
a61af66fc99e Initial load duke parents: diff changeset	235 // we reclame it. When we have seen a zombie method twice, we know that
1644 2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	236 // there are no inline caches that refer to it.
0 a61af66fc99e Initial load duke parents: diff changeset	237 if (nm->is_marked_for_reclamation()) {
a61af66fc99e Initial load duke parents: diff changeset	238 assert(!nm->is_locked_by_vm(), "must not flush locked nmethods");
941 8b46c4d82093 4957990: Perm heap bloat in JVM ysr parents: 0 diff changeset	239 if (PrintMethodFlushing && Verbose) {
1202 5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	240 tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (marked for reclamation) being flushed", nm->compile_id(), nm);
941 8b46c4d82093 4957990: Perm heap bloat in JVM ysr parents: 0 diff changeset	241 }
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	242 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
0 a61af66fc99e Initial load duke parents: diff changeset	243 nm->flush();
a61af66fc99e Initial load duke parents: diff changeset	244 } else {
941 8b46c4d82093 4957990: Perm heap bloat in JVM ysr parents: 0 diff changeset	245 if (PrintMethodFlushing && Verbose) {
1202 5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	246 tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (zombie) being marked for reclamation", nm->compile_id(), nm);
941 8b46c4d82093 4957990: Perm heap bloat in JVM ysr parents: 0 diff changeset	247 }
0 a61af66fc99e Initial load duke parents: diff changeset	248 nm->mark_for_reclamation();
a61af66fc99e Initial load duke parents: diff changeset	249 _rescan = true;
a61af66fc99e Initial load duke parents: diff changeset	250 }
a61af66fc99e Initial load duke parents: diff changeset	251 } else if (nm->is_not_entrant()) {
a61af66fc99e Initial load duke parents: diff changeset	252 // If there is no current activations of this method on the
a61af66fc99e Initial load duke parents: diff changeset	253 // stack we can safely convert it to a zombie method
a61af66fc99e Initial load duke parents: diff changeset	254 if (nm->can_not_entrant_be_converted()) {
941 8b46c4d82093 4957990: Perm heap bloat in JVM ysr parents: 0 diff changeset	255 if (PrintMethodFlushing && Verbose) {
1202 5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	256 tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (not entrant) being made zombie", nm->compile_id(), nm);
941 8b46c4d82093 4957990: Perm heap bloat in JVM ysr parents: 0 diff changeset	257 }
0 a61af66fc99e Initial load duke parents: diff changeset	258 nm->make_zombie();
a61af66fc99e Initial load duke parents: diff changeset	259 _rescan = true;
a61af66fc99e Initial load duke parents: diff changeset	260 } else {
a61af66fc99e Initial load duke parents: diff changeset	261 // Still alive, clean up its inline caches
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	262 MutexLocker cl(CompiledIC_lock);
0 a61af66fc99e Initial load duke parents: diff changeset	263 nm->cleanup_inline_caches();
a61af66fc99e Initial load duke parents: diff changeset	264 // we coudn't transition this nmethod so don't immediately
a61af66fc99e Initial load duke parents: diff changeset	265 // request a rescan. If this method stays on the stack for a
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	266 // long time we don't want to keep rescanning the code cache.
0 a61af66fc99e Initial load duke parents: diff changeset	267 _not_entrant_seen_on_stack++;
a61af66fc99e Initial load duke parents: diff changeset	268 }
a61af66fc99e Initial load duke parents: diff changeset	269 } else if (nm->is_unloaded()) {
a61af66fc99e Initial load duke parents: diff changeset	270 // Unloaded code, just make it a zombie
941 8b46c4d82093 4957990: Perm heap bloat in JVM ysr parents: 0 diff changeset	271 if (PrintMethodFlushing && Verbose)
1202 5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	272 tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (unloaded) being made zombie", nm->compile_id(), nm);
941 8b46c4d82093 4957990: Perm heap bloat in JVM ysr parents: 0 diff changeset	273 if (nm->is_osr_method()) {
0 a61af66fc99e Initial load duke parents: diff changeset	274 // No inline caches will ever point to osr methods, so we can just remove it
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	275 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
0 a61af66fc99e Initial load duke parents: diff changeset	276 nm->flush();
a61af66fc99e Initial load duke parents: diff changeset	277 } else {
a61af66fc99e Initial load duke parents: diff changeset	278 nm->make_zombie();
a61af66fc99e Initial load duke parents: diff changeset	279 _rescan = true;
a61af66fc99e Initial load duke parents: diff changeset	280 }
a61af66fc99e Initial load duke parents: diff changeset	281 } else {
a61af66fc99e Initial load duke parents: diff changeset	282 assert(nm->is_alive(), "should be alive");
1202 5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	283
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	284 if (UseCodeCacheFlushing) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	285 if ((nm->method()->code() != nm) && !(nm->is_locked_by_vm()) && !(nm->is_osr_method()) &&
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	286 (_traversals > _was_full_traversal+2) && (((uint)nm->compile_id()) < _highest_marked) &&
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	287 CodeCache::needs_flushing()) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	288 // This method has not been called since the forced cleanup happened
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	289 nm->make_not_entrant();
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	290 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	291 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	292
0 a61af66fc99e Initial load duke parents: diff changeset	293 // Clean-up all inline caches that points to zombie/non-reentrant methods
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	294 MutexLocker cl(CompiledIC_lock);
0 a61af66fc99e Initial load duke parents: diff changeset	295 nm->cleanup_inline_caches();
a61af66fc99e Initial load duke parents: diff changeset	296 }
a61af66fc99e Initial load duke parents: diff changeset	297 }
1202 5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	298
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	299 // Code cache unloading: when compilers notice the code cache is getting full,
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	300 // they will call a vm op that comes here. This code attempts to speculatively
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	301 // unload the oldest half of the nmethods (based on the compile job id) by
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	302 // saving the old code in a list in the CodeCache. Then
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	303 // execution resumes. If a method so marked is not called by the second sweeper
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	304 // stack traversal after the current one, the nmethod will be marked non-entrant and
1202 5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	305 // got rid of by normal sweeping. If the method is called, the methodOop's
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	306 // _code field is restored and the methodOop/nmethod
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	307 // go back to their normal state.
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	308 void NMethodSweeper::handle_full_code_cache(bool is_full) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	309 // Only the first one to notice can advise us to start early cleaning
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	310 if (!is_full){
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	311 jint old = Atomic::cmpxchg( 1, &_advise_to_sweep, 0 );
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	312 if (old != 0) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	313 return;
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	314 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	315 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	316
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	317 if (is_full) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	318 // Since code cache is full, immediately stop new compiles
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	319 bool did_set = CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation);
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	320 if (!did_set) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	321 // only the first to notice can start the cleaning,
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	322 // others will go back and block
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	323 return;
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	324 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	325 set_was_full(true);
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	326
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	327 // If we run out within MinCodeCacheFlushingInterval of the last unload time, give up
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	328 jlong now = os::javaTimeMillis();
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	329 jlong max_interval = (jlong)MinCodeCacheFlushingInterval * (jlong)1000;
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	330 jlong curr_interval = now - _last_was_full;
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	331 if (curr_interval < max_interval) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	332 _rescan = true;
1644 2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	333 log_sweep("disable_compiler", "flushing_interval='" UINT64_FORMAT "'",
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	334 curr_interval/1000);
1202 5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	335 return;
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	336 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	337 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	338
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	339 VM_HandleFullCodeCache op(is_full);
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	340 VMThread::execute(&op);
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	341
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	342 // rescan again as soon as possible
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	343 _rescan = true;
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	344 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	345
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	346 void NMethodSweeper::speculative_disconnect_nmethods(bool is_full) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	347 // If there was a race in detecting full code cache, only run
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	348 // one vm op for it or keep the compiler shut off
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	349
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	350 debug_only(jlong start = os::javaTimeMillis();)
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	351
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	352 if ((!was_full()) && (is_full)) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	353 if (!CodeCache::needs_flushing()) {
1644 2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	354 log_sweep("restart_compiler");
1202 5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	355 CompileBroker::set_should_compile_new_jobs(CompileBroker::run_compilation);
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	356 return;
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	357 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	358 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	359
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	360 // Traverse the code cache trying to dump the oldest nmethods
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	361 uint curr_max_comp_id = CompileBroker::get_compilation_id();
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	362 uint flush_target = ((curr_max_comp_id - _highest_marked) >> 1) + _highest_marked;
1644 2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	363 log_sweep("start_cleaning");
1202 5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	364
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	365 nmethod* nm = CodeCache::alive_nmethod(CodeCache::first());
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	366 jint disconnected = 0;
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	367 jint made_not_entrant = 0;
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	368 while ((nm != NULL)){
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	369 uint curr_comp_id = nm->compile_id();
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	370
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	371 // OSR methods cannot be flushed like this. Also, don't flush native methods
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	372 // since they are part of the JDK in most cases
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	373 if (nm->is_in_use() && (!nm->is_osr_method()) && (!nm->is_locked_by_vm()) &&
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	374 (!nm->is_native_method()) && ((curr_comp_id < flush_target))) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	375
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	376 if ((nm->method()->code() == nm)) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	377 // This method has not been previously considered for
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	378 // unloading or it was restored already
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	379 CodeCache::speculatively_disconnect(nm);
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	380 disconnected++;
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	381 } else if (nm->is_speculatively_disconnected()) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	382 // This method was previously considered for preemptive unloading and was not called since then
1783 d5d065957597 6953144: Tiered compilation iveresov parents: 1646 diff changeset	383 CompilationPolicy::policy()->delay_compilation(nm->method());
1202 5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	384 nm->make_not_entrant();
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	385 made_not_entrant++;
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	386 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	387
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	388 if (curr_comp_id > _highest_marked) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	389 _highest_marked = curr_comp_id;
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	390 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	391 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	392 nm = CodeCache::alive_nmethod(CodeCache::next(nm));
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	393 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	394
1644 2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	395 log_sweep("stop_cleaning",
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	396 "disconnected='" UINT32_FORMAT "' made_not_entrant='" UINT32_FORMAT "'",
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	397 disconnected, made_not_entrant);
1202 5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	398
1538 bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	399 // Shut off compiler. Sweeper will start over with a new stack scan and
bfe29ec02863 6950075: nmethod sweeper should operate concurrently never parents: 1202 diff changeset	400 // traversal cycle and turn it back on if it clears enough space.
1202 5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	401 if (was_full()) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	402 _last_was_full = os::javaTimeMillis();
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	403 CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation);
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	404 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	405
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	406 // After two more traversals the sweeper will get rid of unrestored nmethods
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	407 _was_full_traversal = _traversals;
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	408 #ifdef ASSERT
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	409 jlong end = os::javaTimeMillis();
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	410 if(PrintMethodFlushing && Verbose) {
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	411 tty->print_cr("### sweeper: unload time: " INT64_FORMAT, end-start);
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	412 }
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	413 #endif
5f24d0319e54 4360113: Evict nmethods when code cache gets full kvn parents: 1000 diff changeset	414 }
1644 2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	415
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	416
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	417 // Print out some state information about the current sweep and the
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	418 // state of the code cache if it's requested.
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	419 void NMethodSweeper::log_sweep(const char* msg, const char* format, ...) {
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	420 if (PrintMethodFlushing) {
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	421 ttyLocker ttyl;
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	422 tty->print("### sweeper: %s ", msg);
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	423 if (format != NULL) {
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	424 va_list ap;
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	425 va_start(ap, format);
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	426 tty->vprint(format, ap);
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	427 va_end(ap);
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	428 }
2353 1c0cf339481b 7025742: Can not use CodeCache::unallocated_capacity() with fragmented CodeCache kvn parents: 1972 diff changeset	429 CodeCache::log_state(tty); tty->cr();
1644 2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	430 }
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	431
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	432 if (LogCompilation && (xtty != NULL)) {
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	433 ttyLocker ttyl;
1646 8d5934a77f10 6968385: malformed xml in sweeper logging never parents: 1644 diff changeset	434 xtty->begin_elem("sweeper state='%s' traversals='" INTX_FORMAT "' ", msg, (intx)traversal_count());
1644 2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	435 if (format != NULL) {
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	436 va_list ap;
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	437 va_start(ap, format);
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	438 xtty->vprint(format, ap);
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	439 va_end(ap);
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	440 }
2353 1c0cf339481b 7025742: Can not use CodeCache::unallocated_capacity() with fragmented CodeCache kvn parents: 1972 diff changeset	441 CodeCache::log_state(xtty);
1644 2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	442 xtty->stamp();
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	443 xtty->end_elem();
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	444 }
2a47bd84841f 6965184: possible races in make_not_entrant_or_zombie never parents: 1615 diff changeset	445 }

Mercurial > hg > truffle

annotate src/share/vm/runtime/sweeper.cpp @ 2426:1d1603768966