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/*
* Copyright (c) 2016, 2020, 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.
* 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 "gc/shenandoah/shenandoahGeneration.hpp"
#include "gc/shenandoah/shenandoahHeap.inline.hpp"
#include "gc/shenandoah/shenandoahHeapRegion.inline.hpp"
#include "gc/shenandoah/shenandoahHeapRegionSet.hpp"
#include "gc/shenandoah/shenandoahHeapRegionCounters.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) {
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);
+ strcpy(_name_space, cns); // copy cns into _name_space
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"); //creating new 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 " " SIZE_FORMAT " " SIZE_FORMAT " " SIZE_FORMAT,
+ 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) {
+ if (current - last > ShenandoahRegionSamplingRate && Atomic::cmpxchg(&_last_sample_millis, last, current) == last) {
ShenandoahHeap* heap = ShenandoahHeap::heap();
- jlong status = 0;
- if (heap->is_concurrent_mark_in_progress()) status |= 1 << 0;
- if (heap->is_evacuation_in_progress()) status |= 1 << 1;
- if (heap->is_update_refs_in_progress()) status |= 1 << 2;
- _status->set_value(status);
-
+ _status->set_value(encode_heap_status(heap));
_timestamp->set_value(os::elapsed_counter());
- size_t num_regions = heap->num_regions();
-
{
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_full_gc_in_progress()) {
+ return 1;
+ }
+ assert(heap->is_idle(), "What is it doing?");
+ 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;
}
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