< prev index next > src/hotspot/share/gc/shenandoah/shenandoahCollectorPolicy.cpp
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/*
* Copyright (c) 2013, 2021, Red Hat, Inc. All rights reserved.
+ * Copyright Amazon.com Inc. 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.
#include "gc/shenandoah/shenandoahHeap.inline.hpp"
#include "runtime/os.hpp"
ShenandoahCollectorPolicy::ShenandoahCollectorPolicy() :
_success_concurrent_gcs(0),
+ _abbreviated_concurrent_gcs(0),
_success_degenerated_gcs(0),
+ _abbreviated_degenerated_gcs(0),
_success_full_gcs(0),
+ _consecutive_degenerated_gcs(0),
+ _consecutive_young_gcs(0),
+ _mixed_gcs(0),
+ _success_old_gcs(0),
+ _interrupted_old_gcs(0),
_alloc_failure_degenerated(0),
_alloc_failure_degenerated_upgrade_to_full(0),
- _alloc_failure_full(0),
- _explicit_concurrent(0),
- _explicit_full(0),
- _implicit_concurrent(0),
- _implicit_full(0),
- _cycle_counter(0) {
+ _alloc_failure_full(0) {
- Copy::zero_to_bytes(_degen_points, sizeof(size_t) * ShenandoahGC::_DEGENERATED_LIMIT);
+ Copy::zero_to_bytes(_degen_point_counts, sizeof(size_t) * ShenandoahGC::_DEGENERATED_LIMIT);
+ Copy::zero_to_bytes(_collection_cause_counts, sizeof(size_t) * GCCause::_last_gc_cause);
_tracer = new ShenandoahTracer();
-
- }
-
- void ShenandoahCollectorPolicy::record_explicit_to_concurrent() {
- _explicit_concurrent++;
- }
-
- void ShenandoahCollectorPolicy::record_explicit_to_full() {
- _explicit_full++;
- }
-
- void ShenandoahCollectorPolicy::record_implicit_to_concurrent() {
- _implicit_concurrent++;
}
- void ShenandoahCollectorPolicy::record_implicit_to_full() {
- _implicit_full++;
+ void ShenandoahCollectorPolicy::record_collection_cause(GCCause::Cause cause) {
+ assert(cause < GCCause::_last_gc_cause, "Invalid GCCause");
+ _collection_cause_counts[cause]++;
}
void ShenandoahCollectorPolicy::record_alloc_failure_to_full() {
_alloc_failure_full++;
}
void ShenandoahCollectorPolicy::record_alloc_failure_to_degenerated(ShenandoahGC::ShenandoahDegenPoint point) {
assert(point < ShenandoahGC::_DEGENERATED_LIMIT, "sanity");
_alloc_failure_degenerated++;
- _degen_points[point]++;
+ _degen_point_counts[point]++;
}
void ShenandoahCollectorPolicy::record_degenerated_upgrade_to_full() {
+ _consecutive_degenerated_gcs = 0;
_alloc_failure_degenerated_upgrade_to_full++;
}
- void ShenandoahCollectorPolicy::record_success_concurrent() {
+ void ShenandoahCollectorPolicy::record_success_concurrent(bool is_young, bool is_abbreviated) {
+ update_young(is_young);
+
+ _consecutive_degenerated_gcs = 0;
_success_concurrent_gcs++;
+ if (is_abbreviated) {
+ _abbreviated_concurrent_gcs++;
+ }
}
- void ShenandoahCollectorPolicy::record_success_degenerated() {
- _success_degenerated_gcs++;
+ void ShenandoahCollectorPolicy::record_mixed_cycle() {
+ _mixed_gcs++;
}
- void ShenandoahCollectorPolicy::record_success_full() {
- _success_full_gcs++;
+ void ShenandoahCollectorPolicy::record_success_old() {
+ _consecutive_young_gcs = 0;
+ _success_old_gcs++;
}
- size_t ShenandoahCollectorPolicy::cycle_counter() const {
- return _cycle_counter;
+ void ShenandoahCollectorPolicy::record_interrupted_old() {
+ _consecutive_young_gcs = 0;
+ _interrupted_old_gcs++;
}
- void ShenandoahCollectorPolicy::record_cycle_start() {
- _cycle_counter++;
+ void ShenandoahCollectorPolicy::record_success_degenerated(bool is_young, bool is_abbreviated) {
+ update_young(is_young);
+
+ _success_degenerated_gcs++;
+ _consecutive_degenerated_gcs++;
+ if (is_abbreviated) {
+ _abbreviated_degenerated_gcs++;
+ }
+ }
+
+ void ShenandoahCollectorPolicy::update_young(bool is_young) {
+ if (is_young) {
+ _consecutive_young_gcs++;
+ } else {
+ _consecutive_young_gcs = 0;
+ }
+ }
+
+ void ShenandoahCollectorPolicy::record_success_full() {
+ _consecutive_degenerated_gcs = 0;
+ _consecutive_young_gcs = 0;
+ _success_full_gcs++;
}
void ShenandoahCollectorPolicy::record_shutdown() {
_in_shutdown.set();
}
bool ShenandoahCollectorPolicy::is_at_shutdown() {
return _in_shutdown.is_set();
}
+ bool is_explicit_gc(GCCause::Cause cause) {
+ return GCCause::is_user_requested_gc(cause)
+ || GCCause::is_serviceability_requested_gc(cause);
+ }
+
+ bool is_implicit_gc(GCCause::Cause cause) {
+ return cause != GCCause::_no_gc
+ && cause != GCCause::_shenandoah_concurrent_gc
+ && cause != GCCause::_allocation_failure
+ && !is_explicit_gc(cause);
+ }
+
+ #ifdef ASSERT
+ bool is_valid_request(GCCause::Cause cause) {
+ return is_explicit_gc(cause)
+ || cause == GCCause::_metadata_GC_clear_soft_refs
+ || cause == GCCause::_codecache_GC_aggressive
+ || cause == GCCause::_codecache_GC_threshold
+ || cause == GCCause::_full_gc_alot
+ || cause == GCCause::_wb_young_gc
+ || cause == GCCause::_wb_full_gc
+ || cause == GCCause::_wb_breakpoint
+ || cause == GCCause::_scavenge_alot;
+ }
+ #endif
+
+ bool ShenandoahCollectorPolicy::is_requested_gc(GCCause::Cause cause) {
+ return is_explicit_gc(cause) || is_implicit_gc(cause);
+ }
+
+ bool ShenandoahCollectorPolicy::should_run_full_gc(GCCause::Cause cause) {
+ return is_explicit_gc(cause) ? !ExplicitGCInvokesConcurrent : !ShenandoahImplicitGCInvokesConcurrent;
+ }
+
+ bool ShenandoahCollectorPolicy::should_handle_requested_gc(GCCause::Cause cause) {
+ assert(is_valid_request(cause), "only requested GCs here: %s", GCCause::to_string(cause));
+
+ if (DisableExplicitGC) {
+ return !is_explicit_gc(cause);
+ }
+ return true;
+ }
+
void ShenandoahCollectorPolicy::print_gc_stats(outputStream* out) const {
out->print_cr("Under allocation pressure, concurrent cycles may cancel, and either continue cycle");
out->print_cr("under stop-the-world pause or result in stop-the-world Full GC. Increase heap size,");
out->print_cr("tune GC heuristics, set more aggressive pacing delay, or lower allocation rate");
- out->print_cr("to avoid Degenerated and Full GC cycles.");
+ out->print_cr("to avoid Degenerated and Full GC cycles. Abbreviated cycles are those which found");
+ out->print_cr("enough regions with no live objects to skip evacuation.");
out->cr();
- out->print_cr(SIZE_FORMAT_W(5) " successful concurrent GCs", _success_concurrent_gcs);
- out->print_cr(" " SIZE_FORMAT_W(5) " invoked explicitly", _explicit_concurrent);
- out->print_cr(" " SIZE_FORMAT_W(5) " invoked implicitly", _implicit_concurrent);
+ size_t completed_gcs = _success_full_gcs + _success_degenerated_gcs + _success_concurrent_gcs + _success_old_gcs;
+ out->print_cr(SIZE_FORMAT_W(5) " Completed GCs", completed_gcs);
+
+ size_t explicit_requests = 0;
+ size_t implicit_requests = 0;
+ for (int c = 0; c < GCCause::_last_gc_cause; c++) {
+ size_t cause_count = _collection_cause_counts[c];
+ if (cause_count > 0) {
+ auto cause = (GCCause::Cause) c;
+ if (is_explicit_gc(cause)) {
+ explicit_requests += cause_count;
+ } else if (is_implicit_gc(cause)) {
+ implicit_requests += cause_count;
+ }
+ const char* desc = GCCause::to_string(cause);
+ out->print_cr(" " SIZE_FORMAT_W(5) " caused by %s (%.2f%%)", cause_count, desc, percent_of(cause_count, completed_gcs));
+ }
+ }
+
out->cr();
+ out->print_cr(SIZE_FORMAT_W(5) " Successful Concurrent GCs (%.2f%%)", _success_concurrent_gcs, percent_of(_success_concurrent_gcs, completed_gcs));
+ if (ExplicitGCInvokesConcurrent) {
+ out->print_cr(" " SIZE_FORMAT_W(5) " invoked explicitly (%.2f%%)", explicit_requests, percent_of(explicit_requests, _success_concurrent_gcs));
+ }
+ if (ShenandoahImplicitGCInvokesConcurrent) {
+ out->print_cr(" " SIZE_FORMAT_W(5) " invoked implicitly (%.2f%%)", implicit_requests, percent_of(implicit_requests, _success_concurrent_gcs));
+ }
+ out->print_cr(" " SIZE_FORMAT_W(5) " abbreviated (%.2f%%)", _abbreviated_concurrent_gcs, percent_of(_abbreviated_concurrent_gcs, _success_concurrent_gcs));
+ out->cr();
+
+ if (ShenandoahHeap::heap()->mode()->is_generational()) {
+ out->print_cr(SIZE_FORMAT_W(5) " Completed Old GCs (%.2f%%)", _success_old_gcs, percent_of(_success_old_gcs, completed_gcs));
+ out->print_cr(" " SIZE_FORMAT_W(5) " mixed", _mixed_gcs);
+ out->print_cr(" " SIZE_FORMAT_W(5) " interruptions", _interrupted_old_gcs);
+ out->cr();
+ }
- out->print_cr(SIZE_FORMAT_W(5) " Degenerated GCs", _success_degenerated_gcs);
- out->print_cr(" " SIZE_FORMAT_W(5) " caused by allocation failure", _alloc_failure_degenerated);
+ size_t degenerated_gcs = _alloc_failure_degenerated_upgrade_to_full + _success_degenerated_gcs;
+ out->print_cr(SIZE_FORMAT_W(5) " Degenerated GCs (%.2f%%)", degenerated_gcs, percent_of(degenerated_gcs, completed_gcs));
+ out->print_cr(" " SIZE_FORMAT_W(5) " upgraded to Full GC (%.2f%%)", _alloc_failure_degenerated_upgrade_to_full, percent_of(_alloc_failure_degenerated_upgrade_to_full, degenerated_gcs));
+ out->print_cr(" " SIZE_FORMAT_W(5) " caused by allocation failure (%.2f%%)", _alloc_failure_degenerated, percent_of(_alloc_failure_degenerated, degenerated_gcs));
+ out->print_cr(" " SIZE_FORMAT_W(5) " abbreviated (%.2f%%)", _abbreviated_degenerated_gcs, percent_of(_abbreviated_degenerated_gcs, degenerated_gcs));
for (int c = 0; c < ShenandoahGC::_DEGENERATED_LIMIT; c++) {
- if (_degen_points[c] > 0) {
+ if (_degen_point_counts[c] > 0) {
const char* desc = ShenandoahGC::degen_point_to_string((ShenandoahGC::ShenandoahDegenPoint)c);
- out->print_cr(" " SIZE_FORMAT_W(5) " happened at %s", _degen_points[c], desc);
+ out->print_cr(" " SIZE_FORMAT_W(5) " happened at %s", _degen_point_counts[c], desc);
}
}
- out->print_cr(" " SIZE_FORMAT_W(5) " upgraded to Full GC", _alloc_failure_degenerated_upgrade_to_full);
out->cr();
- out->print_cr(SIZE_FORMAT_W(5) " Full GCs", _success_full_gcs + _alloc_failure_degenerated_upgrade_to_full);
- out->print_cr(" " SIZE_FORMAT_W(5) " invoked explicitly", _explicit_full);
- out->print_cr(" " SIZE_FORMAT_W(5) " invoked implicitly", _implicit_full);
- out->print_cr(" " SIZE_FORMAT_W(5) " caused by allocation failure", _alloc_failure_full);
- out->print_cr(" " SIZE_FORMAT_W(5) " upgraded from Degenerated GC", _alloc_failure_degenerated_upgrade_to_full);
+ out->print_cr(SIZE_FORMAT_W(5) " Full GCs (%.2f%%)", _success_full_gcs, percent_of(_success_full_gcs, completed_gcs));
+ if (!ExplicitGCInvokesConcurrent) {
+ out->print_cr(" " SIZE_FORMAT_W(5) " invoked explicitly (%.2f%%)", explicit_requests, percent_of(explicit_requests, _success_concurrent_gcs));
+ }
+ if (!ShenandoahImplicitGCInvokesConcurrent) {
+ out->print_cr(" " SIZE_FORMAT_W(5) " invoked implicitly (%.2f%%)", implicit_requests, percent_of(implicit_requests, _success_concurrent_gcs));
+ }
+ out->print_cr(" " SIZE_FORMAT_W(5) " caused by allocation failure (%.2f%%)", _alloc_failure_full, percent_of(_alloc_failure_full, _success_full_gcs));
+ out->print_cr(" " SIZE_FORMAT_W(5) " upgraded from Degenerated GC (%.2f%%)", _alloc_failure_degenerated_upgrade_to_full, percent_of(_alloc_failure_degenerated_upgrade_to_full, _success_full_gcs));
}
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