| /* |
| * Copyright (c) 2016, 2020, Red Hat, Inc. All rights reserved. |
| * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved. |
| * Copyright (c) 2025, 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 "gc/shenandoah/shenandoahGeneration.hpp" |
| #include "gc/shenandoah/shenandoahHeap.inline.hpp" |
| #include "gc/shenandoah/shenandoahHeapRegion.inline.hpp" |
| #include "gc/shenandoah/shenandoahHeapRegionCounters.hpp" |
| #include "gc/shenandoah/shenandoahHeapRegionSet.hpp" |
| #include "logging/logStream.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "runtime/atomic.hpp" |
| #include "runtime/perfData.inline.hpp" |
| #include "utilities/defaultStream.hpp" |
| |
| ShenandoahHeapRegionCounters::ShenandoahHeapRegionCounters() : |
| _last_sample_millis(0) |
| { |
| if (UsePerfData && ShenandoahRegionSampling) { |
| EXCEPTION_MARK; |
| ResourceMark rm; |
| ShenandoahHeap* heap = ShenandoahHeap::heap(); |
| size_t num_regions = heap->num_regions(); |
| const char* cns = PerfDataManager::name_space("shenandoah", "regions"); |
| _name_space = NEW_C_HEAP_ARRAY(char, strlen(cns)+1, mtGC); |
| strcpy(_name_space, cns); |
| |
| const char* cname = PerfDataManager::counter_name(_name_space, "timestamp"); |
| _timestamp = PerfDataManager::create_long_variable(SUN_GC, cname, PerfData::U_None, CHECK); |
| |
| cname = PerfDataManager::counter_name(_name_space, "max_regions"); |
| PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_None, num_regions, CHECK); |
| |
| cname = PerfDataManager::counter_name(_name_space, "protocol_version"); |
| PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_None, VERSION_NUMBER, CHECK); |
| |
| cname = PerfDataManager::counter_name(_name_space, "region_size"); |
| PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_None, ShenandoahHeapRegion::region_size_bytes() >> 10, CHECK); |
| |
| cname = PerfDataManager::counter_name(_name_space, "status"); |
| _status = PerfDataManager::create_long_variable(SUN_GC, cname, |
| PerfData::U_None, CHECK); |
| |
| _regions_data = NEW_C_HEAP_ARRAY(PerfVariable*, num_regions, mtGC); |
| // Initializing performance data resources for each region |
| for (uint i = 0; i < num_regions; i++) { |
| const char* reg_name = PerfDataManager::name_space(_name_space, "region", i); |
| const char* data_name = PerfDataManager::counter_name(reg_name, "data"); |
| const char* ns = PerfDataManager::ns_to_string(SUN_GC); |
| const char* fullname = PerfDataManager::counter_name(ns, data_name); |
| assert(!PerfDataManager::exists(fullname), "must not exist"); |
| _regions_data[i] = PerfDataManager::create_long_variable(SUN_GC, data_name, PerfData::U_None, CHECK); |
| } |
| } |
| } |
| |
| ShenandoahHeapRegionCounters::~ShenandoahHeapRegionCounters() { |
| if (_name_space != nullptr) FREE_C_HEAP_ARRAY(char, _name_space); |
| } |
| |
| void ShenandoahHeapRegionCounters::write_snapshot(PerfLongVariable** regions, |
| PerfLongVariable* ts, |
| PerfLongVariable* status, |
| size_t num_regions, |
| size_t region_size, size_t protocol_version) { |
| LogTarget(Trace, gc, region) lt; |
| if (lt.is_enabled()) { |
| ResourceMark rm; |
| LogStream ls(lt); |
| |
| ls.print_cr(JLONG_FORMAT " " JLONG_FORMAT " %zu %zu %zu", |
| ts->get_value(), status->get_value(), num_regions, region_size, protocol_version); |
| if (num_regions > 0) { |
| ls.print(JLONG_FORMAT, regions[0]->get_value()); |
| } |
| for (uint i = 1; i < num_regions; ++i) { |
| ls.print(" " JLONG_FORMAT, regions[i]->get_value()); |
| } |
| ls.cr(); |
| } |
| } |
| |
| void ShenandoahHeapRegionCounters::update() { |
| if (ShenandoahRegionSampling) { |
| jlong current = nanos_to_millis(os::javaTimeNanos()); |
| jlong last = _last_sample_millis; |
| if (current - last > ShenandoahRegionSamplingRate && Atomic::cmpxchg(&_last_sample_millis, last, current) == last) { |
| |
| ShenandoahHeap* heap = ShenandoahHeap::heap(); |
| _status->set_value(encode_heap_status(heap)); |
| _timestamp->set_value(os::elapsed_counter()); |
| |
| { |
| ShenandoahHeapLocker locker(heap->lock()); |
| size_t rs = ShenandoahHeapRegion::region_size_bytes(); |
| size_t num_regions = heap->num_regions(); |
| for (uint i = 0; i < num_regions; i++) { |
| ShenandoahHeapRegion* r = heap->get_region(i); |
| jlong data = 0; |
| data |= ((100 * r->used() / rs) & PERCENT_MASK) << USED_SHIFT; |
| data |= ((100 * r->get_live_data_bytes() / rs) & PERCENT_MASK) << LIVE_SHIFT; |
| data |= ((100 * r->get_tlab_allocs() / rs) & PERCENT_MASK) << TLAB_SHIFT; |
| data |= ((100 * r->get_gclab_allocs() / rs) & PERCENT_MASK) << GCLAB_SHIFT; |
| data |= ((100 * r->get_plab_allocs() / rs) & PERCENT_MASK) << PLAB_SHIFT; |
| data |= ((100 * r->get_shared_allocs() / rs) & PERCENT_MASK) << SHARED_SHIFT; |
| |
| data |= (r->age() & AGE_MASK) << AGE_SHIFT; |
| data |= (r->affiliation() & AFFILIATION_MASK) << AFFILIATION_SHIFT; |
| data |= (r->state_ordinal() & STATUS_MASK) << STATUS_SHIFT; |
| _regions_data[i]->set_value(data); |
| } |
| |
| // If logging enabled, dump current region snapshot to log file |
| write_snapshot(_regions_data, _timestamp, _status, num_regions, rs >> 10, VERSION_NUMBER); |
| } |
| } |
| } |
| } |
| |
| static int encode_phase(ShenandoahHeap* heap) { |
| if (heap->is_evacuation_in_progress() || heap->is_full_gc_move_in_progress()) { |
| return 2; |
| } |
| if (heap->is_update_refs_in_progress() || heap->is_full_gc_move_in_progress()) { |
| return 3; |
| } |
| if (heap->is_concurrent_mark_in_progress() || heap->is_concurrent_weak_root_in_progress() || heap->is_full_gc_in_progress()) { |
| return 1; |
| } |
| assert(heap->is_idle(), "Unexpected gc_state: %d", heap->gc_state()); |
| return 0; |
| } |
| |
| static int get_generation_shift(ShenandoahGeneration* generation) { |
| switch (generation->type()) { |
| case NON_GEN: |
| case GLOBAL: |
| return 0; |
| case OLD: |
| return 2; |
| case YOUNG: |
| return 4; |
| default: |
| ShouldNotReachHere(); |
| return -1; |
| } |
| } |
| |
| jlong ShenandoahHeapRegionCounters::encode_heap_status(ShenandoahHeap* heap) { |
| |
| if (heap->is_idle() && !heap->is_full_gc_in_progress()) { |
| return 0; |
| } |
| |
| jlong status = 0; |
| if (!heap->mode()->is_generational()) { |
| status = encode_phase(heap); |
| } else { |
| int phase = encode_phase(heap); |
| ShenandoahGeneration* generation = heap->active_generation(); |
| assert(generation != nullptr, "Expected active generation in this mode."); |
| int shift = get_generation_shift(generation); |
| status |= ((phase & 0x3) << shift); |
| if (heap->is_concurrent_old_mark_in_progress()) { |
| status |= (1 << 2); |
| } |
| log_develop_trace(gc)("%s, phase=%u, old_mark=%s, status=" JLONG_FORMAT, |
| generation->name(), phase, BOOL_TO_STR(heap->is_concurrent_old_mark_in_progress()), status); |
| } |
| |
| if (heap->is_degenerated_gc_in_progress()) { |
| status |= (1 << 6); |
| } |
| if (heap->is_full_gc_in_progress()) { |
| status |= (1 << 7); |
| } |
| |
| return status; |
| } |
