1/*
2 * Copyright (c) 2016, 2018, Red Hat, Inc. All rights reserved.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This code is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * version 2 for more details (a copy is included in the LICENSE file that
12 * accompanied this code).
13 *
14 * You should have received a copy of the GNU General Public License version
15 * 2 along with this work; if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
19 * or visit www.oracle.com if you need additional information or have any
20 * questions.
21 *
22 */
23
24#include "precompiled.hpp"
25#include "gc/shenandoah/shenandoahHeap.inline.hpp"
26#include "gc/shenandoah/shenandoahHeapRegion.hpp"
27#include "gc/shenandoah/shenandoahHeapRegionSet.hpp"
28#include "gc/shenandoah/shenandoahHeapRegionCounters.hpp"
29#include "memory/resourceArea.hpp"
30#include "runtime/perfData.inline.hpp"
31
32ShenandoahHeapRegionCounters::ShenandoahHeapRegionCounters() :
33 _last_sample_millis(0)
34{
35 if (UsePerfData && ShenandoahRegionSampling) {
36 EXCEPTION_MARK;
37 ResourceMark rm;
38 ShenandoahHeap* heap = ShenandoahHeap::heap();
39 size_t num_regions = heap->num_regions();
40 const char* cns = PerfDataManager::name_space("shenandoah", "regions");
41 _name_space = NEW_C_HEAP_ARRAY(char, strlen(cns)+1, mtGC);
42 strcpy(_name_space, cns);
43
44 const char* cname = PerfDataManager::counter_name(_name_space, "timestamp");
45 _timestamp = PerfDataManager::create_long_variable(SUN_GC, cname, PerfData::U_None, CHECK);
46
47 cname = PerfDataManager::counter_name(_name_space, "max_regions");
48 PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_None, num_regions, CHECK);
49
50 cname = PerfDataManager::counter_name(_name_space, "region_size");
51 PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_None, ShenandoahHeapRegion::region_size_bytes() >> 10, CHECK);
52
53 cname = PerfDataManager::counter_name(_name_space, "status");
54 _status = PerfDataManager::create_long_variable(SUN_GC, cname,
55 PerfData::U_None, CHECK);
56
57 _regions_data = NEW_C_HEAP_ARRAY(PerfVariable*, num_regions, mtGC);
58 for (uint i = 0; i < num_regions; i++) {
59 const char* reg_name = PerfDataManager::name_space(_name_space, "region", i);
60 const char* data_name = PerfDataManager::counter_name(reg_name, "data");
61 const char* ns = PerfDataManager::ns_to_string(SUN_GC);
62 const char* fullname = PerfDataManager::counter_name(ns, data_name);
63 assert(!PerfDataManager::exists(fullname), "must not exist");
64 _regions_data[i] = PerfDataManager::create_long_variable(SUN_GC, data_name,
65 PerfData::U_None, CHECK);
66 }
67 }
68}
69
70ShenandoahHeapRegionCounters::~ShenandoahHeapRegionCounters() {
71 if (_name_space != NULL) FREE_C_HEAP_ARRAY(char, _name_space);
72}
73
74void ShenandoahHeapRegionCounters::update() {
75 if (ShenandoahRegionSampling) {
76 jlong current = os::javaTimeMillis();
77 jlong last = _last_sample_millis;
78 if (current - last > ShenandoahRegionSamplingRate &&
79 Atomic::cmpxchg(current, &_last_sample_millis, last) == last) {
80
81 ShenandoahHeap* heap = ShenandoahHeap::heap();
82 jlong status = 0;
83 if (heap->is_concurrent_mark_in_progress()) status |= 1 << 0;
84 if (heap->is_evacuation_in_progress()) status |= 1 << 1;
85 if (heap->is_update_refs_in_progress()) status |= 1 << 2;
86 if (heap->is_concurrent_traversal_in_progress()) status |= 1 << 3;
87 _status->set_value(status);
88
89 _timestamp->set_value(os::elapsed_counter());
90
91 size_t num_regions = heap->num_regions();
92
93 {
94 ShenandoahHeapLocker locker(heap->lock());
95 size_t rs = ShenandoahHeapRegion::region_size_bytes();
96 for (uint i = 0; i < num_regions; i++) {
97 ShenandoahHeapRegion* r = heap->get_region(i);
98 jlong data = 0;
99 data |= ((100 * r->used() / rs) & PERCENT_MASK) << USED_SHIFT;
100 data |= ((100 * r->get_live_data_bytes() / rs) & PERCENT_MASK) << LIVE_SHIFT;
101 data |= ((100 * r->get_tlab_allocs() / rs) & PERCENT_MASK) << TLAB_SHIFT;
102 data |= ((100 * r->get_gclab_allocs() / rs) & PERCENT_MASK) << GCLAB_SHIFT;
103 data |= ((100 * r->get_shared_allocs() / rs) & PERCENT_MASK) << SHARED_SHIFT;
104 data |= (r->state_ordinal() & STATUS_MASK) << STATUS_SHIFT;
105 _regions_data[i]->set_value(data);
106 }
107 }
108
109 }
110 }
111}
112