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8020151: PSR:PERF Large performance regressions when code cache is filled
Code cache sweeping based on method hotness; removed speculatively disconnect Reviewed-by: kvn, iveresov
This commit is contained in:
Albert Noll
parent
441f1d74cf
commit
0dee555ead
15 changed files with 240 additions and 418 deletions
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@ -127,64 +127,79 @@ void NMethodSweeper::record_sweep(nmethod* nm, int line) {
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#define SWEEP(nm)
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#endif
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nmethod* NMethodSweeper::_current = NULL; // Current nmethod
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long NMethodSweeper::_traversals = 0; // Nof. stack traversals performed
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int NMethodSweeper::_seen = 0; // Nof. nmethods we have currently processed in current pass of CodeCache
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int NMethodSweeper::_flushed_count = 0; // Nof. nmethods flushed in current sweep
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int NMethodSweeper::_zombified_count = 0; // Nof. nmethods made zombie in current sweep
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int NMethodSweeper::_marked_count = 0; // Nof. nmethods marked for reclaim in current sweep
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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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int NMethodSweeper::_flushed_count = 0; // Nof. nmethods flushed in current sweep
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int NMethodSweeper::_zombified_count = 0; // Nof. nmethods made zombie in current sweep
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int NMethodSweeper::_marked_count = 0; // Nof. nmethods marked for reclaim in current sweep
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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::_invocations = 0; // Nof. 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::_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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int NMethodSweeper::_dead_compile_ids = 0;
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long NMethodSweeper::_last_flush_traversal_id = 0;
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bool NMethodSweeper::_request_mark_phase = false;
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int NMethodSweeper::_number_of_flushes = 0; // Total of full traversals caused by full cache
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int NMethodSweeper::_total_nof_methods_reclaimed = 0;
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jlong NMethodSweeper::_total_time_sweeping = 0;
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jlong NMethodSweeper::_total_time_this_sweep = 0;
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jlong NMethodSweeper::_peak_sweep_time = 0;
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jlong NMethodSweeper::_peak_sweep_fraction_time = 0;
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jlong NMethodSweeper::_total_disconnect_time = 0;
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jlong NMethodSweeper::_peak_disconnect_time = 0;
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jlong NMethodSweeper::_total_time_sweeping = 0;
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jlong NMethodSweeper::_total_time_this_sweep = 0;
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jlong NMethodSweeper::_peak_sweep_time = 0;
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jlong NMethodSweeper::_peak_sweep_fraction_time = 0;
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int NMethodSweeper::_hotness_counter_reset_val = 0;
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class MarkActivationClosure: public CodeBlobClosure {
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public:
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virtual void do_code_blob(CodeBlob* cb) {
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// If we see an activation belonging to a non_entrant nmethod, we mark it.
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if (cb->is_nmethod() && ((nmethod*)cb)->is_not_entrant()) {
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((nmethod*)cb)->mark_as_seen_on_stack();
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if (cb->is_nmethod()) {
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nmethod* nm = (nmethod*)cb;
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nm->set_hotness_counter(NMethodSweeper::hotness_counter_reset_val());
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// If we see an activation belonging to a non_entrant nmethod, we mark it.
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if (nm->is_not_entrant()) {
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nm->mark_as_seen_on_stack();
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}
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}
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}
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};
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static MarkActivationClosure mark_activation_closure;
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class SetHotnessClosure: public CodeBlobClosure {
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public:
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virtual void do_code_blob(CodeBlob* cb) {
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if (cb->is_nmethod()) {
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nmethod* nm = (nmethod*)cb;
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nm->set_hotness_counter(NMethodSweeper::hotness_counter_reset_val());
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}
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}
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};
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static SetHotnessClosure set_hotness_closure;
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int NMethodSweeper::hotness_counter_reset_val() {
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if (_hotness_counter_reset_val == 0) {
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_hotness_counter_reset_val = (ReservedCodeCacheSize < M) ? 1 : (ReservedCodeCacheSize / M) * 2;
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}
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return _hotness_counter_reset_val;
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}
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bool NMethodSweeper::sweep_in_progress() {
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return (_current != NULL);
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}
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void NMethodSweeper::scan_stacks() {
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// Scans the stacks of all Java threads and marks activations of not-entrant methods.
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// No need to synchronize access, since 'mark_active_nmethods' is always executed at a
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// safepoint.
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void NMethodSweeper::mark_active_nmethods() {
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assert(SafepointSynchronize::is_at_safepoint(), "must be executed at a safepoint");
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if (!MethodFlushing) return;
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// No need to synchronize access, since this is always executed at a
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// safepoint.
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// Make sure CompiledIC_lock in unlocked, since we might update some
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// inline caches. If it is, we just bail-out and try later.
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if (CompiledIC_lock->is_locked() || Patching_lock->is_locked()) return;
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// If we do not want to reclaim not-entrant or zombie methods there is no need
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// to scan stacks
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if (!MethodFlushing) {
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return;
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}
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// Check for restart
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assert(CodeCache::find_blob_unsafe(_current) == _current, "Sweeper nmethod cached state invalid");
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if (!sweep_in_progress() && _resweep) {
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if (!sweep_in_progress() && need_marking_phase()) {
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_seen = 0;
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_invocations = NmethodSweepFraction;
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_current = CodeCache::first_nmethod();
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@ -197,30 +212,22 @@ void NMethodSweeper::scan_stacks() {
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Threads::nmethods_do(&mark_activation_closure);
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// reset the flags since we started a scan from the beginning.
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_resweep = false;
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reset_nmethod_marking();
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_locked_seen = 0;
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_not_entrant_seen_on_stack = 0;
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} else {
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// Only set hotness counter
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Threads::nmethods_do(&set_hotness_closure);
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}
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if (UseCodeCacheFlushing) {
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// only allow new flushes after the interval is complete.
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jlong now = os::javaTimeMillis();
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jlong max_interval = (jlong)MinCodeCacheFlushingInterval * (jlong)1000;
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jlong curr_interval = now - _last_full_flush_time;
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if (curr_interval > max_interval) {
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_flush_token = 0;
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}
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if (!CodeCache::needs_flushing() && !CompileBroker::should_compile_new_jobs()) {
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CompileBroker::set_should_compile_new_jobs(CompileBroker::run_compilation);
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log_sweep("restart_compiler");
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}
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}
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OrderAccess::storestore();
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}
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void NMethodSweeper::possibly_sweep() {
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assert(JavaThread::current()->thread_state() == _thread_in_vm, "must run in vm mode");
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if (!MethodFlushing || !sweep_in_progress()) return;
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if (!MethodFlushing || !sweep_in_progress()) {
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return;
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}
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if (_invocations > 0) {
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// Only one thread at a time will sweep
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@ -258,8 +265,7 @@ void NMethodSweeper::sweep_code_cache() {
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if (!CompileBroker::should_compile_new_jobs()) {
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// If we have turned off compilations we might as well do full sweeps
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// in order to reach the clean state faster. Otherwise the sleeping compiler
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// threads will slow down sweeping. After a few iterations the cache
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// will be clean and sweeping stops (_resweep will not be set)
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// threads will slow down sweeping.
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_invocations = 1;
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}
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@ -271,9 +277,11 @@ void NMethodSweeper::sweep_code_cache() {
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int todo = (CodeCache::nof_nmethods() - _seen) / _invocations;
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int swept_count = 0;
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assert(!SafepointSynchronize::is_at_safepoint(), "should not be in safepoint when we get here");
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assert(!CodeCache_lock->owned_by_self(), "just checking");
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int freed_memory = 0;
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{
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MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
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@ -299,7 +307,7 @@ void NMethodSweeper::sweep_code_cache() {
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// Now ready to process nmethod and give up CodeCache_lock
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{
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MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
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process_nmethod(_current);
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freed_memory += process_nmethod(_current);
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}
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_seen++;
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_current = next;
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@ -308,11 +316,11 @@ void NMethodSweeper::sweep_code_cache() {
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assert(_invocations > 1 || _current == NULL, "must have scanned the whole cache");
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if (!sweep_in_progress() && !_resweep && (_locked_seen || _not_entrant_seen_on_stack)) {
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if (!sweep_in_progress() && !need_marking_phase() && (_locked_seen || _not_entrant_seen_on_stack)) {
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// we've completed a scan without making progress but there were
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// nmethods we were unable to process either because they were
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// locked or were still on stack. We don't have to aggresively
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// clean them up so just stop scanning. We could scan once more
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// locked or were still on stack. We don't have to aggressively
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// clean them up so just stop scanning. We could scan once more
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// but that complicates the control logic and it's unlikely to
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// matter much.
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if (PrintMethodFlushing) {
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@ -351,9 +359,16 @@ void NMethodSweeper::sweep_code_cache() {
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log_sweep("finished");
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}
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// Sweeper is the only case where memory is released,
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// check here if it is time to restart the compiler.
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if (UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs() && !CodeCache::needs_flushing()) {
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// Sweeper is the only case where memory is released, check here if it
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// is time to restart the compiler. Only checking if there is a certain
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// amount of free memory in the code cache might lead to re-enabling
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// compilation although no memory has been released. For example, there are
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// cases when compilation was disabled although there is 4MB (or more) free
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// memory in the code cache. The reason is code cache fragmentation. Therefore,
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// it only makes sense to re-enable compilation if we have actually freed memory.
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// Note that typically several kB are released for sweeping 16MB of the code
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// cache. As a result, 'freed_memory' > 0 to restart the compiler.
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if (UseCodeCacheFlushing && (!CompileBroker::should_compile_new_jobs() && (freed_memory > 0))) {
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CompileBroker::set_should_compile_new_jobs(CompileBroker::run_compilation);
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log_sweep("restart_compiler");
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}
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@ -367,8 +382,8 @@ class NMethodMarker: public StackObj {
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_thread = CompilerThread::current();
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if (!nm->is_zombie() && !nm->is_unloaded()) {
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// Only expose live nmethods for scanning
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_thread->set_scanned_nmethod(nm);
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}
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_thread->set_scanned_nmethod(nm);
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}
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}
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~NMethodMarker() {
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_thread->set_scanned_nmethod(NULL);
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@ -392,20 +407,20 @@ void NMethodSweeper::release_nmethod(nmethod *nm) {
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nm->flush();
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}
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void NMethodSweeper::process_nmethod(nmethod *nm) {
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int NMethodSweeper::process_nmethod(nmethod *nm) {
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assert(!CodeCache_lock->owned_by_self(), "just checking");
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int freed_memory = 0;
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// Make sure this nmethod doesn't get unloaded during the scan,
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// since the locks acquired below might safepoint.
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// since safepoints may happen during acquired below locks.
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NMethodMarker nmm(nm);
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SWEEP(nm);
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// Skip methods that are currently referenced by the VM
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if (nm->is_locked_by_vm()) {
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// But still remember to clean-up inline caches for alive nmethods
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if (nm->is_alive()) {
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// Clean-up all inline caches that points to zombie/non-reentrant methods
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// Clean inline caches that point to zombie/non-entrant methods
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MutexLocker cl(CompiledIC_lock);
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nm->cleanup_inline_caches();
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SWEEP(nm);
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@ -413,18 +428,19 @@ void NMethodSweeper::process_nmethod(nmethod *nm) {
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_locked_seen++;
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SWEEP(nm);
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}
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return;
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return freed_memory;
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}
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if (nm->is_zombie()) {
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// If it is first time, we see nmethod then we mark it. Otherwise,
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// we reclame it. When we have seen a zombie method twice, we know that
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// If it is the first time we see nmethod then we mark it. Otherwise,
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// we reclaim it. When we have seen a zombie method twice, we know that
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// there are no inline caches that refer to it.
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if (nm->is_marked_for_reclamation()) {
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assert(!nm->is_locked_by_vm(), "must not flush locked nmethods");
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if (PrintMethodFlushing && Verbose) {
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tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (marked for reclamation) being flushed", nm->compile_id(), nm);
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}
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freed_memory = nm->total_size();
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release_nmethod(nm);
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_flushed_count++;
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} else {
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@ -432,19 +448,19 @@ void NMethodSweeper::process_nmethod(nmethod *nm) {
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tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (zombie) being marked for reclamation", nm->compile_id(), nm);
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}
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nm->mark_for_reclamation();
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_resweep = true;
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request_nmethod_marking();
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_marked_count++;
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SWEEP(nm);
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}
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} else if (nm->is_not_entrant()) {
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// If there is no current activations of this method on the
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// If there are no current activations of this method on the
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// stack we can safely convert it to a zombie method
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if (nm->can_not_entrant_be_converted()) {
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if (PrintMethodFlushing && Verbose) {
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tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (not entrant) being made zombie", nm->compile_id(), nm);
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}
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nm->make_zombie();
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_resweep = true;
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request_nmethod_marking();
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_zombified_count++;
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SWEEP(nm);
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} else {
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@ -459,159 +475,57 @@ void NMethodSweeper::process_nmethod(nmethod *nm) {
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}
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} else if (nm->is_unloaded()) {
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// Unloaded code, just make it a zombie
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if (PrintMethodFlushing && Verbose)
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if (PrintMethodFlushing && Verbose) {
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tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (unloaded) being made zombie", nm->compile_id(), nm);
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}
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if (nm->is_osr_method()) {
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SWEEP(nm);
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// No inline caches will ever point to osr methods, so we can just remove it
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freed_memory = nm->total_size();
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release_nmethod(nm);
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_flushed_count++;
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} else {
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nm->make_zombie();
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_resweep = true;
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request_nmethod_marking();
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_zombified_count++;
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SWEEP(nm);
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}
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} else {
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assert(nm->is_alive(), "should be alive");
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if (UseCodeCacheFlushing) {
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if (nm->is_speculatively_disconnected() && !nm->is_locked_by_vm() && !nm->is_osr_method() &&
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(_traversals > _last_flush_traversal_id + 2) && (nm->compile_id() < _highest_marked)) {
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// This method has not been called since the forced cleanup happened
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nm->make_not_entrant();
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if (!nm->is_locked_by_vm() && !nm->is_osr_method() && !nm->is_native_method()) {
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// Do not make native methods and OSR-methods not-entrant
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nm->dec_hotness_counter();
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// Get the initial value of the hotness counter. This value depends on the
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// ReservedCodeCacheSize
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int reset_val = hotness_counter_reset_val();
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int time_since_reset = reset_val - nm->hotness_counter();
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double threshold = -reset_val + (CodeCache::reverse_free_ratio() * NmethodSweepActivity);
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// The less free space in the code cache we have - the bigger reverse_free_ratio() is.
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// I.e., 'threshold' increases with lower available space in the code cache and a higher
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// NmethodSweepActivity. If the current hotness counter - which decreases from its initial
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// value until it is reset by stack walking - is smaller than the computed threshold, the
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// corresponding nmethod is considered for removal.
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if ((NmethodSweepActivity > 0) && (nm->hotness_counter() < threshold) && (time_since_reset > 10)) {
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// A method is marked as not-entrant if the method is
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// 1) 'old enough': nm->hotness_counter() < threshold
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// 2) The method was in_use for a minimum amount of time: (time_since_reset > 10)
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// The second condition is necessary if we are dealing with very small code cache
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// sizes (e.g., <10m) and the code cache size is too small to hold all hot methods.
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// The second condition ensures that methods are not immediately made not-entrant
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// after compilation.
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nm->make_not_entrant();
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request_nmethod_marking();
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}
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}
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}
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// Clean-up all inline caches that points to zombie/non-reentrant methods
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// Clean-up all inline caches that point to zombie/non-reentrant methods
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MutexLocker cl(CompiledIC_lock);
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nm->cleanup_inline_caches();
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SWEEP(nm);
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}
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return freed_memory;
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}
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// Code cache unloading: when compilers notice the code cache is getting full,
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// they will call a vm op that comes here. This code attempts to speculatively
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// unload the oldest half of the nmethods (based on the compile job id) by
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// saving the old code in a list in the CodeCache. Then
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// execution resumes. If a method so marked is not called by the second sweeper
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// stack traversal after the current one, the nmethod will be marked non-entrant and
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// got rid of by normal sweeping. If the method is called, the Method*'s
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// _code field is restored and the Method*/nmethod
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// go back to their normal state.
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void NMethodSweeper::handle_full_code_cache(bool is_full) {
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if (is_full) {
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// Since code cache is full, immediately stop new compiles
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if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
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log_sweep("disable_compiler");
|
||||
}
|
||||
}
|
||||
|
||||
// Make sure only one thread can flush
|
||||
// The token is reset after CodeCacheMinimumFlushInterval in scan stacks,
|
||||
// no need to check the timeout here.
|
||||
jint old = Atomic::cmpxchg( 1, &_flush_token, 0 );
|
||||
if (old != 0) {
|
||||
return;
|
||||
}
|
||||
|
||||
VM_HandleFullCodeCache op(is_full);
|
||||
VMThread::execute(&op);
|
||||
|
||||
// resweep again as soon as possible
|
||||
_resweep = true;
|
||||
}
|
||||
|
||||
void NMethodSweeper::speculative_disconnect_nmethods(bool is_full) {
|
||||
// If there was a race in detecting full code cache, only run
|
||||
// one vm op for it or keep the compiler shut off
|
||||
|
||||
jlong disconnect_start_counter = os::elapsed_counter();
|
||||
|
||||
// Traverse the code cache trying to dump the oldest nmethods
|
||||
int curr_max_comp_id = CompileBroker::get_compilation_id();
|
||||
int flush_target = ((curr_max_comp_id - _dead_compile_ids) / CodeCacheFlushingFraction) + _dead_compile_ids;
|
||||
|
||||
log_sweep("start_cleaning");
|
||||
|
||||
nmethod* nm = CodeCache::alive_nmethod(CodeCache::first());
|
||||
jint disconnected = 0;
|
||||
jint made_not_entrant = 0;
|
||||
jint nmethod_count = 0;
|
||||
|
||||
while ((nm != NULL)){
|
||||
int curr_comp_id = nm->compile_id();
|
||||
|
||||
// OSR methods cannot be flushed like this. Also, don't flush native methods
|
||||
// since they are part of the JDK in most cases
|
||||
if (!nm->is_osr_method() && !nm->is_locked_by_vm() && !nm->is_native_method()) {
|
||||
|
||||
// only count methods that can be speculatively disconnected
|
||||
nmethod_count++;
|
||||
|
||||
if (nm->is_in_use() && (curr_comp_id < flush_target)) {
|
||||
if ((nm->method()->code() == nm)) {
|
||||
// This method has not been previously considered for
|
||||
// unloading or it was restored already
|
||||
CodeCache::speculatively_disconnect(nm);
|
||||
disconnected++;
|
||||
} else if (nm->is_speculatively_disconnected()) {
|
||||
// This method was previously considered for preemptive unloading and was not called since then
|
||||
CompilationPolicy::policy()->delay_compilation(nm->method());
|
||||
nm->make_not_entrant();
|
||||
made_not_entrant++;
|
||||
}
|
||||
|
||||
if (curr_comp_id > _highest_marked) {
|
||||
_highest_marked = curr_comp_id;
|
||||
}
|
||||
}
|
||||
}
|
||||
nm = CodeCache::alive_nmethod(CodeCache::next(nm));
|
||||
}
|
||||
|
||||
// remember how many compile_ids wheren't seen last flush.
|
||||
_dead_compile_ids = curr_max_comp_id - nmethod_count;
|
||||
|
||||
log_sweep("stop_cleaning",
|
||||
"disconnected='" UINT32_FORMAT "' made_not_entrant='" UINT32_FORMAT "'",
|
||||
disconnected, made_not_entrant);
|
||||
|
||||
// Shut off compiler. Sweeper will start over with a new stack scan and
|
||||
// traversal cycle and turn it back on if it clears enough space.
|
||||
if (is_full) {
|
||||
_last_full_flush_time = os::javaTimeMillis();
|
||||
}
|
||||
|
||||
jlong disconnect_end_counter = os::elapsed_counter();
|
||||
jlong disconnect_time = disconnect_end_counter - disconnect_start_counter;
|
||||
_total_disconnect_time += disconnect_time;
|
||||
_peak_disconnect_time = MAX2(disconnect_time, _peak_disconnect_time);
|
||||
|
||||
EventCleanCodeCache event(UNTIMED);
|
||||
if (event.should_commit()) {
|
||||
event.set_starttime(disconnect_start_counter);
|
||||
event.set_endtime(disconnect_end_counter);
|
||||
event.set_disconnectedCount(disconnected);
|
||||
event.set_madeNonEntrantCount(made_not_entrant);
|
||||
event.commit();
|
||||
}
|
||||
_number_of_flushes++;
|
||||
|
||||
// After two more traversals the sweeper will get rid of unrestored nmethods
|
||||
_last_flush_traversal_id = _traversals;
|
||||
_resweep = true;
|
||||
#ifdef ASSERT
|
||||
|
||||
if(PrintMethodFlushing && Verbose) {
|
||||
tty->print_cr("### sweeper: unload time: " INT64_FORMAT, (jlong)disconnect_time);
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
|
||||
// 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, ...) {
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue