1 /*
2 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26
27 #include "memory/metaspace/metaspaceCommon.hpp"
28 #include "memory/metaspace/virtualSpaceNode.hpp"
29 #include "utilities/debug.hpp"
30 #include "utilities/globalDefinitions.hpp"
31 #include "utilities/ostream.hpp"
32
33 namespace metaspace {
34
35 DEBUG_ONLY(internal_statistics_t g_internal_statistics;)
36
37 // Print a size, in words, scaled.
38 void print_scaled_words(outputStream* st, size_t word_size, size_t scale, int width) {
39 print_human_readable_size(st, word_size * sizeof(MetaWord), scale, width);
40 }
41
42 // Convenience helper: prints a size value and a percentage.
43 void print_scaled_words_and_percentage(outputStream* st, size_t word_size, size_t compare_word_size, size_t scale, int width) {
44 print_scaled_words(st, word_size, scale, width);
45 st->print(" (");
46 print_percentage(st, compare_word_size, word_size);
47 st->print(")");
48 }
49
50 static const char* display_unit_for_scale(size_t scale) {
51 const char* s = NULL;
52 switch(scale) {
53 case 1: s = "bytes"; break;
54 case BytesPerWord: s = "words"; break;
55 case K: s = "KB"; break;
56 case M: s = "MB"; break;
57 case G: s = "GB"; break;
58 default:
59 ShouldNotReachHere();
60 }
61 return s;
62 }
63
64 // Print a human readable size.
65 // byte_size: size, in bytes, to be printed.
66 // scale: one of 1 (byte-wise printing), sizeof(word) (word-size printing), K, M, G (scaled by KB, MB, GB respectively,
67 // or 0, which means the best scale is choosen dynamically.
68 // width: printing width.
69 void print_human_readable_size(outputStream* st, size_t byte_size, size_t scale, int width) {
70 if (scale == 0) {
71 // Dynamic mode. Choose scale for this value.
72 if (byte_size == 0) {
73 // Zero values are printed as bytes.
74 scale = 1;
75 } else {
76 if (byte_size >= G) {
77 scale = G;
78 } else if (byte_size >= M) {
79 scale = M;
80 } else if (byte_size >= K) {
81 scale = K;
82 } else {
83 scale = 1;
84 }
85 }
86 return print_human_readable_size(st, byte_size, scale, width);
87 }
88
89 #ifdef ASSERT
90 assert(scale == 1 || scale == BytesPerWord ||
91 scale == K || scale == M || scale == G, "Invalid scale");
92 // Special case: printing wordsize should only be done with word-sized values
93 if (scale == BytesPerWord) {
94 assert(byte_size % BytesPerWord == 0, "not word sized");
95 }
96 #endif
97
98 if (width == -1) {
99 if (scale == 1) {
100 st->print(SIZE_FORMAT " bytes", byte_size);
101 } else if (scale == BytesPerWord) {
102 st->print(SIZE_FORMAT " words", byte_size / BytesPerWord);
103 } else {
104 const char* display_unit = display_unit_for_scale(scale);
105 float display_value = (float) byte_size / scale;
106 // Prevent very small but non-null values showing up as 0.00.
107 if (byte_size > 0 && display_value < 0.01f) {
108 st->print("<0.01 %s", display_unit);
109 } else {
110 st->print("%.2f %s", display_value, display_unit);
111 }
112 }
113 } else {
114 if (scale == 1) {
115 st->print("%*" PRIuPTR " bytes", width, byte_size);
116 } else if (scale == BytesPerWord) {
117 st->print("%*" PRIuPTR " words", width, byte_size / BytesPerWord);
118 } else {
119 const char* display_unit = display_unit_for_scale(scale);
120 float display_value = (float) byte_size / scale;
121 // Since we use width to display a number with two trailing digits, increase it a bit.
122 width += 3;
123 // Prevent very small but non-null values showing up as 0.00.
124 if (byte_size > 0 && display_value < 0.01f) {
125 st->print("%*s %s", width, "<0.01", display_unit);
126 } else {
127 st->print("%*.2f %s", width, display_value, display_unit);
128 }
129 }
130 }
131 }
132
133 // Prints a percentage value. Values smaller than 1% but not 0 are displayed as "<1%", values
134 // larger than 99% but not 100% are displayed as ">100%".
135 void print_percentage(outputStream* st, size_t total, size_t part) {
136 if (total == 0) {
137 st->print(" ?%%");
138 } else if (part == 0) {
139 st->print(" 0%%");
140 } else if (part == total) {
141 st->print("100%%");
142 } else {
143 // Note: clearly print very-small-but-not-0% and very-large-but-not-100% percentages.
144 float p = ((float)part / total) * 100.0f;
145 if (p < 1.0f) {
146 st->print(" <1%%");
147 } else if (p > 99.0f){
148 st->print(">99%%");
149 } else {
150 st->print("%3.0f%%", p);
151 }
152 }
153 }
154
155 const char* loaders_plural(uintx num) {
156 return num == 1 ? "loader" : "loaders";
157 }
158
159 const char* classes_plural(uintx num) {
160 return num == 1 ? "class" : "classes";
161 }
162
163 void print_number_of_classes(outputStream* out, uintx classes, uintx classes_shared) {
164 out->print(UINTX_FORMAT " %s", classes, classes_plural(classes));
165 if (classes_shared > 0) {
166 out->print(" (" UINTX_FORMAT " shared)", classes_shared);
167 }
168 }
169
170 } // namespace metaspace
171