1 /*
2 * Copyright (c) 2013, 2019, 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/shenandoahMetrics.hpp"
26 #include "gc/shenandoah/shenandoahHeap.inline.hpp"
27 #include "gc/shenandoah/shenandoahHeapRegion.hpp"
28 #include "gc/shenandoah/shenandoahFreeSet.hpp"
29
ShenandoahMetricsSnapshot()30 ShenandoahMetricsSnapshot::ShenandoahMetricsSnapshot() {
31 _heap = ShenandoahHeap::heap();
32 }
33
snap_before()34 void ShenandoahMetricsSnapshot::snap_before() {
35 _used_before = _heap->used();
36 _if_before = _heap->free_set()->internal_fragmentation();
37 _ef_before = _heap->free_set()->external_fragmentation();
38 }
snap_after()39 void ShenandoahMetricsSnapshot::snap_after() {
40 _used_after = _heap->used();
41 _if_after = _heap->free_set()->internal_fragmentation();
42 _ef_after = _heap->free_set()->external_fragmentation();
43 }
44
is_good_progress()45 bool ShenandoahMetricsSnapshot::is_good_progress() {
46 // Under the critical threshold?
47 size_t free_actual = _heap->free_set()->available();
48 size_t free_expected = _heap->max_capacity() / 100 * ShenandoahCriticalFreeThreshold;
49 bool prog_free = free_actual >= free_expected;
50 log_info(gc, ergo)("%s progress for free space: " SIZE_FORMAT "%s, need " SIZE_FORMAT "%s",
51 prog_free ? "Good" : "Bad",
52 byte_size_in_proper_unit(free_actual), proper_unit_for_byte_size(free_actual),
53 byte_size_in_proper_unit(free_expected), proper_unit_for_byte_size(free_expected));
54 if (!prog_free) {
55 return false;
56 }
57
58 // Freed up enough?
59 size_t progress_actual = (_used_before > _used_after) ? _used_before - _used_after : 0;
60 size_t progress_expected = ShenandoahHeapRegion::region_size_bytes();
61 bool prog_used = progress_actual >= progress_expected;
62 log_info(gc, ergo)("%s progress for used space: " SIZE_FORMAT "%s, need " SIZE_FORMAT "%s",
63 prog_used ? "Good" : "Bad",
64 byte_size_in_proper_unit(progress_actual), proper_unit_for_byte_size(progress_actual),
65 byte_size_in_proper_unit(progress_expected), proper_unit_for_byte_size(progress_expected));
66 if (prog_used) {
67 return true;
68 }
69
70 // Internal fragmentation is down?
71 double if_actual = _if_before - _if_after;
72 double if_expected = 0.01; // 1% should be enough
73 bool prog_if = if_actual >= if_expected;
74 log_info(gc, ergo)("%s progress for internal fragmentation: %.1f%%, need %.1f%%",
75 prog_if ? "Good" : "Bad",
76 if_actual * 100, if_expected * 100);
77 if (prog_if) {
78 return true;
79 }
80
81 // External fragmentation is down?
82 double ef_actual = _ef_before - _ef_after;
83 double ef_expected = 0.01; // 1% should be enough
84 bool prog_ef = ef_actual >= ef_expected;
85 log_info(gc, ergo)("%s progress for external fragmentation: %.1f%%, need %.1f%%",
86 prog_ef ? "Good" : "Bad",
87 ef_actual * 100, ef_expected * 100);
88 if (prog_ef) {
89 return true;
90 }
91
92 // Nothing good had happened.
93 return false;
94 }
95