jdk8-mips64-public/hotspot: comparison src/share/vm/runtime/sweeper.cpp

--1:000000000000
+:f90c822e73f8
+/*
+* Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
+* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+*
+* This code is free software; you can redistribute it and/or modify it
+* under the terms of the GNU General Public License version 2 only, as
+* published by the Free Software Foundation.
+*
+* This code is distributed in the hope that it will be useful, but WITHOUT
+* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+* version 2 for more details (a copy is included in the LICENSE file that
+* accompanied this code).
+*
+* You should have received a copy of the GNU General Public License version
+* 2 along with this work; if not, write to the Free Software Foundation,
+* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+*
+* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+* or visit www.oracle.com if you need additional information or have any
+* questions.
+*
+*/
+#include "precompiled.hpp"
+#include "code/codeCache.hpp"
+#include "code/compiledIC.hpp"
+#include "code/icBuffer.hpp"
+#include "code/nmethod.hpp"
+#include "compiler/compileBroker.hpp"
+#include "memory/resourceArea.hpp"
+#include "oops/method.hpp"
+#include "runtime/atomic.hpp"
+#include "runtime/compilationPolicy.hpp"
+#include "runtime/mutexLocker.hpp"
+#include "runtime/os.hpp"
+#include "runtime/sweeper.hpp"
+#include "runtime/vm_operations.hpp"
+#include "trace/tracing.hpp"
+#include "utilities/events.hpp"
+#include "utilities/ticks.inline.hpp"
+#include "utilities/xmlstream.hpp"
+PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
+#ifdef ASSERT
+#define SWEEP(nm) record_sweep(nm, __LINE__)
+// Sweeper logging code
+class SweeperRecord {
+public:
+int traversal;
+int invocation;
+int compile_id;
+long traversal_mark;
+int state;
+const char* kind;
+address vep;
+address uep;
+int line;
+void print() {
+tty->print_cr("traversal = %d invocation = %d compile_id = %d %s uep = " PTR_FORMAT " vep = "
+PTR_FORMAT " state = %d traversal_mark %d line = %d",
+traversal,
+invocation,
+compile_id,
+kind == NULL ? "" : kind,
+uep,
+vep,
+state,
+traversal_mark,
+line);
+}
+};
+static int _sweep_index = 0;
+static SweeperRecord* _records = NULL;
+void NMethodSweeper::report_events(int id, address entry) {
+if (_records != NULL) {
+for (int i = _sweep_index; i < SweeperLogEntries; i++) {
+if (_records[i].uep == entry ||
+_records[i].vep == entry ||
+_records[i].compile_id == id) {
+_records[i].print();
+}
+}
+for (int i = 0; i < _sweep_index; i++) {
+if (_records[i].uep == entry ||
+_records[i].vep == entry ||
+_records[i].compile_id == id) {
+_records[i].print();
+}
+}
+}
+}
+void NMethodSweeper::report_events() {
+if (_records != NULL) {
+for (int i = _sweep_index; i < SweeperLogEntries; i++) {
+// skip empty records
+if (_records[i].vep == NULL) continue;
+_records[i].print();
+}
+for (int i = 0; i < _sweep_index; i++) {
+// skip empty records
+if (_records[i].vep == NULL) continue;
+_records[i].print();
+}
+}
+}
+void NMethodSweeper::record_sweep(nmethod* nm, int line) {
+if (_records != NULL) {
+_records[_sweep_index].traversal = _traversals;
+_records[_sweep_index].traversal_mark = nm->_stack_traversal_mark;
+_records[_sweep_index].invocation = _sweep_fractions_left;
+_records[_sweep_index].compile_id = nm->compile_id();
+_records[_sweep_index].kind = nm->compile_kind();
+_records[_sweep_index].state = nm->_state;
+_records[_sweep_index].vep = nm->verified_entry_point();
+_records[_sweep_index].uep = nm->entry_point();
+_records[_sweep_index].line = line;
+_sweep_index = (_sweep_index + 1) % SweeperLogEntries;
+}
+}
+#else
+#define SWEEP(nm)
+#endif
+nmethod* NMethodSweeper::_current                      = NULL; // Current nmethod
+long     NMethodSweeper::_traversals                   = 0;    // Stack scan count, also sweep ID.
+long     NMethodSweeper::_total_nof_code_cache_sweeps  = 0;    // Total number of full sweeps of the code cache
+long     NMethodSweeper::_time_counter                 = 0;    // Virtual time used to periodically invoke sweeper
+long     NMethodSweeper::_last_sweep                   = 0;    // Value of _time_counter when the last sweep happened
+int      NMethodSweeper::_seen                         = 0;    // Nof. nmethod we have currently processed in current pass of CodeCache
+int      NMethodSweeper::_flushed_count                = 0;    // Nof. nmethods flushed in current sweep
+int      NMethodSweeper::_zombified_count              = 0;    // Nof. nmethods made zombie in current sweep
+int      NMethodSweeper::_marked_for_reclamation_count = 0;    // Nof. nmethods marked for reclaim in current sweep
+volatile bool NMethodSweeper::_should_sweep            = true; // Indicates if we should invoke the sweeper
+volatile int  NMethodSweeper::_sweep_fractions_left    = 0;    // Nof. invocations left until we are completed with this pass
+volatile int  NMethodSweeper::_sweep_started           = 0;    // Flag to control conc sweeper
+volatile int  NMethodSweeper::_bytes_changed           = 0;    // Counts the total nmethod size if the nmethod changed from:
+//   1) alive       -> not_entrant
+//   2) not_entrant -> zombie
+//   3) zombie      -> marked_for_reclamation
+int    NMethodSweeper::_hotness_counter_reset_val       = 0;
+long   NMethodSweeper::_total_nof_methods_reclaimed     = 0;    // Accumulated nof methods flushed
+long   NMethodSweeper::_total_nof_c2_methods_reclaimed  = 0;    // Accumulated nof methods flushed
+size_t NMethodSweeper::_total_flushed_size              = 0;    // Total number of bytes flushed from the code cache
+Tickspan  NMethodSweeper::_total_time_sweeping;                 // Accumulated time sweeping
+Tickspan  NMethodSweeper::_total_time_this_sweep;               // Total time this sweep
+Tickspan  NMethodSweeper::_peak_sweep_time;                     // Peak time for a full sweep
+Tickspan  NMethodSweeper::_peak_sweep_fraction_time;            // Peak time sweeping one fraction
+class MarkActivationClosure: public CodeBlobClosure {
+public:
+virtual void do_code_blob(CodeBlob* cb) {
+if (cb->is_nmethod()) {
+nmethod* nm = (nmethod*)cb;
+nm->set_hotness_counter(NMethodSweeper::hotness_counter_reset_val());
+// If we see an activation belonging to a non_entrant nmethod, we mark it.
+if (nm->is_not_entrant()) {
+nm->mark_as_seen_on_stack();
+}
+}
+}
+};
+static MarkActivationClosure mark_activation_closure;
+class SetHotnessClosure: public CodeBlobClosure {
+public:
+virtual void do_code_blob(CodeBlob* cb) {
+if (cb->is_nmethod()) {
+nmethod* nm = (nmethod*)cb;
+nm->set_hotness_counter(NMethodSweeper::hotness_counter_reset_val());
+}
+}
+};
+static SetHotnessClosure set_hotness_closure;
+int NMethodSweeper::hotness_counter_reset_val() {
+if (_hotness_counter_reset_val == 0) {
+_hotness_counter_reset_val = (ReservedCodeCacheSize < M) ? 1 : (ReservedCodeCacheSize / M) * 2;
+}
+return _hotness_counter_reset_val;
+}
+bool NMethodSweeper::sweep_in_progress() {
+return (_current != NULL);
+}
+// Scans the stacks of all Java threads and marks activations of not-entrant methods.
+// No need to synchronize access, since 'mark_active_nmethods' is always executed at a
+// safepoint.
+void NMethodSweeper::mark_active_nmethods() {
+assert(SafepointSynchronize::is_at_safepoint(), "must be executed at a safepoint");
+// If we do not want to reclaim not-entrant or zombie methods there is no need
+// to scan stacks
+if (!MethodFlushing) {
+return;
+}
+// Increase time so that we can estimate when to invoke the sweeper again.
+_time_counter++;
+// Check for restart
+assert(CodeCache::find_blob_unsafe(_current) == _current, "Sweeper nmethod cached state invalid");
+if (!sweep_in_progress()) {
+_seen = 0;
+_sweep_fractions_left = NmethodSweepFraction;
+_current = CodeCache::first_nmethod();
+_traversals += 1;
+_total_time_this_sweep = Tickspan();
+if (PrintMethodFlushing) {
+tty->print_cr("### Sweep: stack traversal %d", _traversals);
+}
+Threads::nmethods_do(&mark_activation_closure);
+} else {
+// Only set hotness counter
+Threads::nmethods_do(&set_hotness_closure);
+}
+OrderAccess::storestore();
+}
+/**
+* This function invokes the sweeper if at least one of the three conditions is met:
+*    (1) The code cache is getting full
+*    (2) There are sufficient state changes in/since the last sweep.
+*    (3) We have not been sweeping for 'some time'
+*/
+void NMethodSweeper::possibly_sweep() {
+assert(JavaThread::current()->thread_state() == _thread_in_vm, "must run in vm mode");
+// Only compiler threads are allowed to sweep
+if (!MethodFlushing || !sweep_in_progress() || !Thread::current()->is_Compiler_thread()) {
+return;
+}
+// If there was no state change while nmethod sweeping, 'should_sweep' will be false.
+// This is one of the two places where should_sweep can be set to true. The general
+// idea is as follows: If there is enough free space in the code cache, there is no
+// need to invoke the sweeper. The following formula (which determines whether to invoke
+// the sweeper or not) depends on the assumption that for larger ReservedCodeCacheSizes
+// we need less frequent sweeps than for smaller ReservedCodecCacheSizes. Furthermore,
+// the formula considers how much space in the code cache is currently used. Here are
+// some examples that will (hopefully) help in understanding.
+//
+// Small ReservedCodeCacheSizes:  (e.g., < 16M) We invoke the sweeper every time, since
+//                                              the result of the division is 0. This
+//                                              keeps the used code cache size small
+//                                              (important for embedded Java)
+// Large ReservedCodeCacheSize :  (e.g., 256M + code cache is 10% full). The formula
+//                                              computes: (256 / 16) - 1 = 15
+//                                              As a result, we invoke the sweeper after
+//                                              15 invocations of 'mark_active_nmethods.
+// Large ReservedCodeCacheSize:   (e.g., 256M + code Cache is 90% full). The formula
+//                                              computes: (256 / 16) - 10 = 6.
+if (!_should_sweep) {
+const int time_since_last_sweep = _time_counter - _last_sweep;
+// ReservedCodeCacheSize has an 'unsigned' type. We need a 'signed' type for max_wait_time,
+// since 'time_since_last_sweep' can be larger than 'max_wait_time'. If that happens using
+// an unsigned type would cause an underflow (wait_until_next_sweep becomes a large positive
+// value) that disables the intended periodic sweeps.
+const int max_wait_time = ReservedCodeCacheSize / (16 * M);
+double wait_until_next_sweep = max_wait_time - time_since_last_sweep - CodeCache::reverse_free_ratio();
+assert(wait_until_next_sweep <= (double)max_wait_time, "Calculation of code cache sweeper interval is incorrect");
+if ((wait_until_next_sweep <= 0.0) || !CompileBroker::should_compile_new_jobs()) {
+_should_sweep = true;
+}
+}
+if (_should_sweep && _sweep_fractions_left > 0) {
+// Only one thread at a time will sweep
+jint old = Atomic::cmpxchg( 1, &_sweep_started, 0 );
+if (old != 0) {
+return;
+}
+#ifdef ASSERT
+if (LogSweeper && _records == NULL) {
+// Create the ring buffer for the logging code
+_records = NEW_C_HEAP_ARRAY(SweeperRecord, SweeperLogEntries, mtGC);
+memset(_records, 0, sizeof(SweeperRecord) * SweeperLogEntries);
+}
+#endif
+if (_sweep_fractions_left > 0) {
+sweep_code_cache();
+_sweep_fractions_left--;
+}
+// We are done with sweeping the code cache once.
+if (_sweep_fractions_left == 0) {
+_total_nof_code_cache_sweeps++;
+_last_sweep = _time_counter;
+// Reset flag; temporarily disables sweeper
+_should_sweep = false;
+// If there was enough state change, 'possibly_enable_sweeper()'
+// sets '_should_sweep' to true
+possibly_enable_sweeper();
+// Reset _bytes_changed only if there was enough state change. _bytes_changed
+// can further increase by calls to 'report_state_change'.
+if (_should_sweep) {
+_bytes_changed = 0;
+}
+}
+// Release work, because another compiler thread could continue.
+OrderAccess::release_store((int*)&_sweep_started, 0);
+}
+}
+void NMethodSweeper::sweep_code_cache() {
+Ticks sweep_start_counter = Ticks::now();
+_flushed_count                = 0;
+_zombified_count              = 0;
+_marked_for_reclamation_count = 0;
+if (PrintMethodFlushing && Verbose) {
+tty->print_cr("### Sweep at %d out of %d. Invocations left: %d", _seen, CodeCache::nof_nmethods(), _sweep_fractions_left);
+}
+if (!CompileBroker::should_compile_new_jobs()) {
+// If we have turned off compilations we might as well do full sweeps
+// in order to reach the clean state faster. Otherwise the sleeping compiler
+// threads will slow down sweeping.
+_sweep_fractions_left = 1;
+}
+// We want to visit all nmethods after NmethodSweepFraction
+// invocations so divide the remaining number of nmethods by the
+// remaining number of invocations.  This is only an estimate since
+// the number of nmethods changes during the sweep so the final
+// stage must iterate until it there are no more nmethods.
+int todo = (CodeCache::nof_nmethods() - _seen) / _sweep_fractions_left;
+int swept_count = 0;
+assert(!SafepointSynchronize::is_at_safepoint(), "should not be in safepoint when we get here");
+assert(!CodeCache_lock->owned_by_self(), "just checking");
+int freed_memory = 0;
+{
+MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
+// The last invocation iterates until there are no more nmethods
+for (int i = 0; (i < todo || _sweep_fractions_left == 1) && _current != NULL; i++) {
+swept_count++;
+if (SafepointSynchronize::is_synchronizing()) { // Safepoint request
+if (PrintMethodFlushing && Verbose) {
+tty->print_cr("### Sweep at %d out of %d, invocation: %d, yielding to safepoint", _seen, CodeCache::nof_nmethods(), _sweep_fractions_left);
+}
+MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
+assert(Thread::current()->is_Java_thread(), "should be java thread");
+JavaThread* thread = (JavaThread*)Thread::current();
+ThreadBlockInVM tbivm(thread);
+thread->java_suspend_self();
+}
+// Since we will give up the CodeCache_lock, always skip ahead
+// to the next nmethod.  Other blobs can be deleted by other
+// threads but nmethods are only reclaimed by the sweeper.
+nmethod* next = CodeCache::next_nmethod(_current);
+// Now ready to process nmethod and give up CodeCache_lock
+{
+MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
+freed_memory += process_nmethod(_current);
+}
+_seen++;
+_current = next;
+}
+}
+assert(_sweep_fractions_left > 1 || _current == NULL, "must have scanned the whole cache");
+const Ticks sweep_end_counter = Ticks::now();
+const Tickspan sweep_time = sweep_end_counter - sweep_start_counter;
+_total_time_sweeping  += sweep_time;
+_total_time_this_sweep += sweep_time;
+_peak_sweep_fraction_time = MAX2(sweep_time, _peak_sweep_fraction_time);
+_total_flushed_size += freed_memory;
+_total_nof_methods_reclaimed += _flushed_count;
+EventSweepCodeCache event(UNTIMED);
+if (event.should_commit()) {
+event.set_starttime(sweep_start_counter);
+event.set_endtime(sweep_end_counter);
+event.set_sweepIndex(_traversals);
+event.set_sweepFractionIndex(NmethodSweepFraction - _sweep_fractions_left + 1);
+event.set_sweptCount(swept_count);
+event.set_flushedCount(_flushed_count);
+event.set_markedCount(_marked_for_reclamation_count);
+event.set_zombifiedCount(_zombified_count);
+event.commit();
+}
+#ifdef ASSERT
+if(PrintMethodFlushing) {
+tty->print_cr("### sweeper:      sweep time(%d): "
+INT64_FORMAT, _sweep_fractions_left, (jlong)sweep_time.value());
+}
+#endif
+if (_sweep_fractions_left == 1) {
+_peak_sweep_time = MAX2(_peak_sweep_time, _total_time_this_sweep);
+log_sweep("finished");
+}
+// Sweeper is the only case where memory is released, check here if it
+// is time to restart the compiler. Only checking if there is a certain
+// amount of free memory in the code cache might lead to re-enabling
+// compilation although no memory has been released. For example, there are
+// cases when compilation was disabled although there is 4MB (or more) free
+// memory in the code cache. The reason is code cache fragmentation. Therefore,
+// it only makes sense to re-enable compilation if we have actually freed memory.
+// Note that typically several kB are released for sweeping 16MB of the code
+// cache. As a result, 'freed_memory' > 0 to restart the compiler.
+if (!CompileBroker::should_compile_new_jobs() && (freed_memory > 0)) {
+CompileBroker::set_should_compile_new_jobs(CompileBroker::run_compilation);
+log_sweep("restart_compiler");
+}
+}
+/**
+* This function updates the sweeper statistics that keep track of nmethods
+* state changes. If there is 'enough' state change, the sweeper is invoked
+* as soon as possible. There can be data races on _bytes_changed. The data
+* races are benign, since it does not matter if we loose a couple of bytes.
+* In the worst case we call the sweeper a little later. Also, we are guaranteed
+* to invoke the sweeper if the code cache gets full.
+*/
+void NMethodSweeper::report_state_change(nmethod* nm) {
+_bytes_changed += nm->total_size();
+possibly_enable_sweeper();
+}
+/**
+* Function determines if there was 'enough' state change in the code cache to invoke
+* the sweeper again. Currently, we determine 'enough' as more than 1% state change in
+* the code cache since the last sweep.
+*/
+void NMethodSweeper::possibly_enable_sweeper() {
+double percent_changed = ((double)_bytes_changed / (double)ReservedCodeCacheSize) * 100;
+if (percent_changed > 1.0) {
+_should_sweep = true;
+}
+}
+class NMethodMarker: public StackObj {
+private:
+CompilerThread* _thread;
+public:
+NMethodMarker(nmethod* nm) {
+_thread = CompilerThread::current();
+if (!nm->is_zombie() && !nm->is_unloaded()) {
+// Only expose live nmethods for scanning
+_thread->set_scanned_nmethod(nm);
+}
+}
+~NMethodMarker() {
+_thread->set_scanned_nmethod(NULL);
+}
+};
+void NMethodSweeper::release_nmethod(nmethod *nm) {
+// Clean up any CompiledICHolders
+{
+ResourceMark rm;
+MutexLocker ml_patch(CompiledIC_lock);
+RelocIterator iter(nm);
+while (iter.next()) {
+if (iter.type() == relocInfo::virtual_call_type) {
+CompiledIC::cleanup_call_site(iter.virtual_call_reloc());
+}
+}
+}
+MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
+nm->flush();
+}
+int NMethodSweeper::process_nmethod(nmethod *nm) {
+assert(!CodeCache_lock->owned_by_self(), "just checking");
+int freed_memory = 0;
+// Make sure this nmethod doesn't get unloaded during the scan,
+// since safepoints may happen during acquired below locks.
+NMethodMarker nmm(nm);
+SWEEP(nm);
+// Skip methods that are currently referenced by the VM
+if (nm->is_locked_by_vm()) {
+// But still remember to clean-up inline caches for alive nmethods
+if (nm->is_alive()) {
+// Clean inline caches that point to zombie/non-entrant methods
+MutexLocker cl(CompiledIC_lock);
+nm->cleanup_inline_caches();
+SWEEP(nm);
+}
+return freed_memory;
+}
+if (nm->is_zombie()) {
+// If it is the first time we see nmethod then we mark it. Otherwise,
+// we reclaim it. When we have seen a zombie method twice, we know that
+// there are no inline caches that refer to it.
+if (nm->is_marked_for_reclamation()) {
+assert(!nm->is_locked_by_vm(), "must not flush locked nmethods");
+if (PrintMethodFlushing && Verbose) {
+tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (marked for reclamation) being flushed", nm->compile_id(), nm);
+}
+freed_memory = nm->total_size();
+if (nm->is_compiled_by_c2()) {
+_total_nof_c2_methods_reclaimed++;
+}
+release_nmethod(nm);
+_flushed_count++;
+} else {
+if (PrintMethodFlushing && Verbose) {
+tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (zombie) being marked for reclamation", nm->compile_id(), nm);
+}
+nm->mark_for_reclamation();
+// Keep track of code cache state change
+_bytes_changed += nm->total_size();
+_marked_for_reclamation_count++;
+SWEEP(nm);
+}
+} else if (nm->is_not_entrant()) {
+// If there are no current activations of this method on the
+// stack we can safely convert it to a zombie method
+if (nm->can_not_entrant_be_converted()) {
+if (PrintMethodFlushing && Verbose) {
+tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (not entrant) being made zombie", nm->compile_id(), nm);
+}
+// Code cache state change is tracked in make_zombie()
+nm->make_zombie();
+_zombified_count++;
+SWEEP(nm);
+} else {
+// Still alive, clean up its inline caches
+MutexLocker cl(CompiledIC_lock);
+nm->cleanup_inline_caches();
+SWEEP(nm);
+}
+} else if (nm->is_unloaded()) {
+// Unloaded code, just make it a zombie
+if (PrintMethodFlushing && Verbose) {
+tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (unloaded) being made zombie", nm->compile_id(), nm);
+}
+if (nm->is_osr_method()) {
+SWEEP(nm);
+// No inline caches will ever point to osr methods, so we can just remove it
+freed_memory = nm->total_size();
+if (nm->is_compiled_by_c2()) {
+_total_nof_c2_methods_reclaimed++;
+}
+release_nmethod(nm);
+_flushed_count++;
+} else {
+// Code cache state change is tracked in make_zombie()
+nm->make_zombie();
+_zombified_count++;
+SWEEP(nm);
+}
+} else {
+if (UseCodeCacheFlushing) {
+if (!nm->is_locked_by_vm() && !nm->is_osr_method() && !nm->is_native_method()) {
+// Do not make native methods and OSR-methods not-entrant
+nm->dec_hotness_counter();
+// Get the initial value of the hotness counter. This value depends on the
+// ReservedCodeCacheSize
+int reset_val = hotness_counter_reset_val();
+int time_since_reset = reset_val - nm->hotness_counter();
+double threshold = -reset_val + (CodeCache::reverse_free_ratio() * NmethodSweepActivity);
+// The less free space in the code cache we have - the bigger reverse_free_ratio() is.
+// I.e., 'threshold' increases with lower available space in the code cache and a higher
+// NmethodSweepActivity. If the current hotness counter - which decreases from its initial
+// value until it is reset by stack walking - is smaller than the computed threshold, the
+// corresponding nmethod is considered for removal.
+if ((NmethodSweepActivity > 0) && (nm->hotness_counter() < threshold) && (time_since_reset > 10)) {
+// A method is marked as not-entrant if the method is
+// 1) 'old enough': nm->hotness_counter() < threshold
+// 2) The method was in_use for a minimum amount of time: (time_since_reset > 10)
+//    The second condition is necessary if we are dealing with very small code cache
+//    sizes (e.g., <10m) and the code cache size is too small to hold all hot methods.
+//    The second condition ensures that methods are not immediately made not-entrant
+//    after compilation.
+nm->make_not_entrant();
+// Code cache state change is tracked in make_not_entrant()
+if (PrintMethodFlushing && Verbose) {
+tty->print_cr("### Nmethod %d/" PTR_FORMAT "made not-entrant: hotness counter %d/%d threshold %f",
+nm->compile_id(), nm, nm->hotness_counter(), reset_val, threshold);
+}
+}
+}
+}
+// Clean-up all inline caches that point to zombie/non-reentrant methods
+MutexLocker cl(CompiledIC_lock);
+nm->cleanup_inline_caches();
+SWEEP(nm);
+}
+return freed_memory;
+}
+// Print out some state information about the current sweep and the
+// state of the code cache if it's requested.
+void NMethodSweeper::log_sweep(const char* msg, const char* format, ...) {
+if (PrintMethodFlushing) {
+stringStream s;
+// Dump code cache state into a buffer before locking the tty,
+// because log_state() will use locks causing lock conflicts.
+CodeCache::log_state(&s);
+ttyLocker ttyl;
+tty->print("### sweeper: %s ", msg);
+if (format != NULL) {
+va_list ap;
+va_start(ap, format);
+tty->vprint(format, ap);
+va_end(ap);
+}
+tty->print_cr("%s", s.as_string());
+}
+if (LogCompilation && (xtty != NULL)) {
+stringStream s;
+// Dump code cache state into a buffer before locking the tty,
+// because log_state() will use locks causing lock conflicts.
+CodeCache::log_state(&s);
+ttyLocker ttyl;
+xtty->begin_elem("sweeper state='%s' traversals='" INTX_FORMAT "' ", msg, (intx)traversal_count());
+if (format != NULL) {
+va_list ap;
+va_start(ap, format);
+xtty->vprint(format, ap);
+va_end(ap);
+}
+xtty->print("%s", s.as_string());
+xtty->stamp();
+xtty->end_elem();
+}
+}
+void NMethodSweeper::print() {
+ttyLocker ttyl;
+tty->print_cr("Code cache sweeper statistics:");
+tty->print_cr("  Total sweep time:                %1.0lfms", (double)_total_time_sweeping.value()/1000000);
+tty->print_cr("  Total number of full sweeps:     %ld", _total_nof_code_cache_sweeps);
+tty->print_cr("  Total number of flushed methods: %ld(%ld C2 methods)", _total_nof_methods_reclaimed,
+_total_nof_c2_methods_reclaimed);
+tty->print_cr("  Total size of flushed methods:   " SIZE_FORMAT "kB", _total_flushed_size/K);
+}

Mercurial > jdk8-mips64-public > hotspot / file comparison

comparison: src/share/vm/runtime/sweeper.cpp

src/share/vm/runtime/sweeper.cpp