Thu, 12 Mar 2009 10:37:46 -0700
6791178: Specialize for zero as the compressed oop vm heap base
Summary: Use zero based compressed oops if java heap is below 32gb and unscaled compressed oops if java heap is below 4gb.
Reviewed-by: never, twisti, jcoomes, coleenp
1 /*
2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 # include "incls/_precompiled.incl"
26 # include "incls/_vm_version_sparc.cpp.incl"
28 int VM_Version::_features = VM_Version::unknown_m;
29 const char* VM_Version::_features_str = "";
31 bool VM_Version::is_niagara1_plus() {
32 // This is a placeholder until the real test is determined.
33 return is_niagara1() &&
34 (os::processor_count() > maximum_niagara1_processor_count());
35 }
37 void VM_Version::initialize() {
38 _features = determine_features();
39 PrefetchCopyIntervalInBytes = prefetch_copy_interval_in_bytes();
40 PrefetchScanIntervalInBytes = prefetch_scan_interval_in_bytes();
41 PrefetchFieldsAhead = prefetch_fields_ahead();
43 // Allocation prefetch settings
44 intx cache_line_size = L1_data_cache_line_size();
45 if( cache_line_size > AllocatePrefetchStepSize )
46 AllocatePrefetchStepSize = cache_line_size;
47 if( FLAG_IS_DEFAULT(AllocatePrefetchLines) )
48 AllocatePrefetchLines = 3; // Optimistic value
49 assert( AllocatePrefetchLines > 0, "invalid value");
50 if( AllocatePrefetchLines < 1 ) // set valid value in product VM
51 AllocatePrefetchLines = 1; // Conservative value
53 AllocatePrefetchDistance = allocate_prefetch_distance();
54 AllocatePrefetchStyle = allocate_prefetch_style();
56 assert(AllocatePrefetchDistance % AllocatePrefetchStepSize == 0, "invalid value");
58 UseSSE = 0; // Only on x86 and x64
60 _supports_cx8 = has_v9();
62 if (is_niagara1()) {
63 // Indirect branch is the same cost as direct
64 if (FLAG_IS_DEFAULT(UseInlineCaches)) {
65 UseInlineCaches = false;
66 }
67 #ifdef _LP64
68 // Single issue niagara1 is slower for CompressedOops
69 // but niagaras after that it's fine.
70 if (!is_niagara1_plus()) {
71 if (FLAG_IS_DEFAULT(UseCompressedOops)) {
72 FLAG_SET_ERGO(bool, UseCompressedOops, false);
73 }
74 }
75 // 32-bit oops don't make sense for the 64-bit VM on sparc
76 // since the 32-bit VM has the same registers and smaller objects.
77 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
78 #endif // _LP64
79 #ifdef COMPILER2
80 // Indirect branch is the same cost as direct
81 if (FLAG_IS_DEFAULT(UseJumpTables)) {
82 UseJumpTables = true;
83 }
84 // Single-issue, so entry and loop tops are
85 // aligned on a single instruction boundary
86 if (FLAG_IS_DEFAULT(InteriorEntryAlignment)) {
87 InteriorEntryAlignment = 4;
88 }
89 if (FLAG_IS_DEFAULT(OptoLoopAlignment)) {
90 OptoLoopAlignment = 4;
91 }
92 #endif
93 }
95 char buf[512];
96 jio_snprintf(buf, sizeof(buf), "%s%s%s%s%s%s%s%s%s%s%s",
97 (has_v8() ? ", has_v8" : ""),
98 (has_v9() ? ", has_v9" : ""),
99 (has_vis1() ? ", has_vis1" : ""),
100 (has_vis2() ? ", has_vis2" : ""),
101 (is_ultra3() ? ", is_ultra3" : ""),
102 (is_sun4v() ? ", is_sun4v" : ""),
103 (is_niagara1() ? ", is_niagara1" : ""),
104 (is_niagara1_plus() ? ", is_niagara1_plus" : ""),
105 (!has_hardware_mul32() ? ", no-mul32" : ""),
106 (!has_hardware_div32() ? ", no-div32" : ""),
107 (!has_hardware_fsmuld() ? ", no-fsmuld" : ""));
109 // buf is started with ", " or is empty
110 _features_str = strdup(strlen(buf) > 2 ? buf + 2 : buf);
112 #ifndef PRODUCT
113 if (PrintMiscellaneous && Verbose) {
114 tty->print("Allocation: ");
115 if (AllocatePrefetchStyle <= 0) {
116 tty->print_cr("no prefetching");
117 } else {
118 if (AllocatePrefetchLines > 1) {
119 tty->print_cr("PREFETCH %d, %d lines of size %d bytes", AllocatePrefetchDistance, AllocatePrefetchLines, AllocatePrefetchStepSize);
120 } else {
121 tty->print_cr("PREFETCH %d, one line", AllocatePrefetchDistance);
122 }
123 }
124 if (PrefetchCopyIntervalInBytes > 0) {
125 tty->print_cr("PrefetchCopyIntervalInBytes %d", PrefetchCopyIntervalInBytes);
126 }
127 if (PrefetchScanIntervalInBytes > 0) {
128 tty->print_cr("PrefetchScanIntervalInBytes %d", PrefetchScanIntervalInBytes);
129 }
130 if (PrefetchFieldsAhead > 0) {
131 tty->print_cr("PrefetchFieldsAhead %d", PrefetchFieldsAhead);
132 }
133 }
134 #endif // PRODUCT
135 }
137 void VM_Version::print_features() {
138 tty->print_cr("Version:%s", cpu_features());
139 }
141 int VM_Version::determine_features() {
142 if (UseV8InstrsOnly) {
143 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-V8");)
144 return generic_v8_m;
145 }
147 int features = platform_features(unknown_m); // platform_features() is os_arch specific
149 if (features == unknown_m) {
150 features = generic_v9_m;
151 warning("Cannot recognize SPARC version. Default to V9");
152 }
154 if (UseNiagaraInstrs) {
155 if (is_niagara1(features)) {
156 // Happy to accomodate...
157 } else {
158 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-Niagara");)
159 features = niagara1_m;
160 }
161 } else {
162 if (is_niagara1(features) && !FLAG_IS_DEFAULT(UseNiagaraInstrs)) {
163 NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-Not-Niagara");)
164 features &= ~niagara1_unique_m;
165 } else {
166 // Happy to accomodate...
167 }
168 }
170 return features;
171 }
173 static int saved_features = 0;
175 void VM_Version::allow_all() {
176 saved_features = _features;
177 _features = all_features_m;
178 }
180 void VM_Version::revert() {
181 _features = saved_features;
182 }
184 unsigned int VM_Version::calc_parallel_worker_threads() {
185 unsigned int result;
186 if (is_niagara1_plus()) {
187 result = nof_parallel_worker_threads(5, 16, 8);
188 } else {
189 result = nof_parallel_worker_threads(5, 8, 8);
190 }
191 return result;
192 }