Mercurial > hg > graal-jvmci-8
view src/cpu/sparc/vm/vm_version_sparc.cpp @ 2368:dde920245681
6896099: Integrate CMS heap ergo with default heap sizing ergo
6627787: CMS: JVM refuses to start up with -Xms16m -Xmx16m
7000125: CMS: Anti-monotone young gen sizing with respect to maximum whole heap size specification
7027529: CMS: retire CMSUseOldDefaults flag
Summary: Simplify CMS heap sizing code, relying on ergonomic initial sizing consistent with other collectors for the most part, controlling only young gen sizing to rein in pause times. Make CMS young gen sizing default statically cpu-dependant. Remove inconsistencies wrt generation sizing and policy code, allowing for the fixing for 6627787 and 7000125. For 7027529, retire the flag CMSUseOldDefaults which had been introduced as a bridge from JDK 5 to JDK 6 a number of years ago.
Reviewed-by: brutisso, poonam
author | ysr |
---|---|
date | Wed, 16 Mar 2011 10:37:08 -0700 |
parents | c04052fd6ae1 |
children | faa472957b38 |
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/* * Copyright (c) 1997, 2010, Oracle and/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. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * 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 "assembler_sparc.inline.hpp" #include "memory/resourceArea.hpp" #include "runtime/java.hpp" #include "runtime/stubCodeGenerator.hpp" #include "vm_version_sparc.hpp" #ifdef TARGET_OS_FAMILY_linux # include "os_linux.inline.hpp" #endif #ifdef TARGET_OS_FAMILY_solaris # include "os_solaris.inline.hpp" #endif int VM_Version::_features = VM_Version::unknown_m; const char* VM_Version::_features_str = ""; void VM_Version::initialize() { _features = determine_features(); PrefetchCopyIntervalInBytes = prefetch_copy_interval_in_bytes(); PrefetchScanIntervalInBytes = prefetch_scan_interval_in_bytes(); PrefetchFieldsAhead = prefetch_fields_ahead(); // Allocation prefetch settings intx cache_line_size = L1_data_cache_line_size(); if( cache_line_size > AllocatePrefetchStepSize ) AllocatePrefetchStepSize = cache_line_size; if( FLAG_IS_DEFAULT(AllocatePrefetchLines) ) AllocatePrefetchLines = 3; // Optimistic value assert( AllocatePrefetchLines > 0, "invalid value"); if( AllocatePrefetchLines < 1 ) // set valid value in product VM AllocatePrefetchLines = 1; // Conservative value AllocatePrefetchDistance = allocate_prefetch_distance(); AllocatePrefetchStyle = allocate_prefetch_style(); assert(AllocatePrefetchDistance % AllocatePrefetchStepSize == 0, "invalid value"); UseSSE = 0; // Only on x86 and x64 _supports_cx8 = has_v9(); if (is_niagara()) { // Indirect branch is the same cost as direct if (FLAG_IS_DEFAULT(UseInlineCaches)) { FLAG_SET_DEFAULT(UseInlineCaches, false); } // Align loops on a single instruction boundary. if (FLAG_IS_DEFAULT(OptoLoopAlignment)) { FLAG_SET_DEFAULT(OptoLoopAlignment, 4); } // When using CMS, we cannot use memset() in BOT updates because // the sun4v/CMT version in libc_psr uses BIS which exposes // "phantom zeros" to concurrent readers. See 6948537. if (FLAG_IS_DEFAULT(UseMemSetInBOT) && UseConcMarkSweepGC) { FLAG_SET_DEFAULT(UseMemSetInBOT, false); } #ifdef _LP64 // 32-bit oops don't make sense for the 64-bit VM on sparc // since the 32-bit VM has the same registers and smaller objects. Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); #endif // _LP64 #ifdef COMPILER2 // Indirect branch is the same cost as direct if (FLAG_IS_DEFAULT(UseJumpTables)) { FLAG_SET_DEFAULT(UseJumpTables, true); } // Single-issue, so entry and loop tops are // aligned on a single instruction boundary if (FLAG_IS_DEFAULT(InteriorEntryAlignment)) { FLAG_SET_DEFAULT(InteriorEntryAlignment, 4); } if (is_niagara_plus()) { if (has_blk_init() && AllocatePrefetchStyle > 0 && FLAG_IS_DEFAULT(AllocatePrefetchStyle)) { // Use BIS instruction for allocation prefetch. FLAG_SET_DEFAULT(AllocatePrefetchStyle, 3); if (FLAG_IS_DEFAULT(AllocatePrefetchDistance)) { // Use smaller prefetch distance on N2 with BIS FLAG_SET_DEFAULT(AllocatePrefetchDistance, 64); } } if (AllocatePrefetchStyle != 3 && FLAG_IS_DEFAULT(AllocatePrefetchDistance)) { // Use different prefetch distance without BIS FLAG_SET_DEFAULT(AllocatePrefetchDistance, 256); } } #endif } // Use hardware population count instruction if available. if (has_hardware_popc()) { if (FLAG_IS_DEFAULT(UsePopCountInstruction)) { FLAG_SET_DEFAULT(UsePopCountInstruction, true); } } #ifdef COMPILER2 // Currently not supported anywhere. FLAG_SET_DEFAULT(UseFPUForSpilling, false); #endif char buf[512]; jio_snprintf(buf, sizeof(buf), "%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s", (has_v8() ? ", has_v8" : ""), (has_v9() ? ", has_v9" : ""), (has_hardware_popc() ? ", popc" : ""), (has_vis1() ? ", has_vis1" : ""), (has_vis2() ? ", has_vis2" : ""), (has_vis3() ? ", has_vis3" : ""), (has_blk_init() ? ", has_blk_init" : ""), (is_ultra3() ? ", is_ultra3" : ""), (is_sun4v() ? ", is_sun4v" : ""), (is_niagara() ? ", is_niagara" : ""), (is_niagara_plus() ? ", is_niagara_plus" : ""), (is_sparc64() ? ", is_sparc64" : ""), (!has_hardware_mul32() ? ", no-mul32" : ""), (!has_hardware_div32() ? ", no-div32" : ""), (!has_hardware_fsmuld() ? ", no-fsmuld" : "")); // buf is started with ", " or is empty _features_str = strdup(strlen(buf) > 2 ? buf + 2 : buf); #ifndef PRODUCT if (PrintMiscellaneous && Verbose) { tty->print("Allocation: "); if (AllocatePrefetchStyle <= 0) { tty->print_cr("no prefetching"); } else { if (AllocatePrefetchLines > 1) { tty->print_cr("PREFETCH %d, %d lines of size %d bytes", AllocatePrefetchDistance, AllocatePrefetchLines, AllocatePrefetchStepSize); } else { tty->print_cr("PREFETCH %d, one line", AllocatePrefetchDistance); } } if (PrefetchCopyIntervalInBytes > 0) { tty->print_cr("PrefetchCopyIntervalInBytes %d", PrefetchCopyIntervalInBytes); } if (PrefetchScanIntervalInBytes > 0) { tty->print_cr("PrefetchScanIntervalInBytes %d", PrefetchScanIntervalInBytes); } if (PrefetchFieldsAhead > 0) { tty->print_cr("PrefetchFieldsAhead %d", PrefetchFieldsAhead); } } #endif // PRODUCT } void VM_Version::print_features() { tty->print_cr("Version:%s", cpu_features()); } int VM_Version::determine_features() { if (UseV8InstrsOnly) { NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-V8");) return generic_v8_m; } int features = platform_features(unknown_m); // platform_features() is os_arch specific if (features == unknown_m) { features = generic_v9_m; warning("Cannot recognize SPARC version. Default to V9"); } assert(is_T_family(features) == is_niagara(features), "Niagara should be T series"); if (UseNiagaraInstrs) { // Force code generation for Niagara if (is_T_family(features)) { // Happy to accomodate... } else { NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-Niagara");) features |= T_family_m; } } else { if (is_T_family(features) && !FLAG_IS_DEFAULT(UseNiagaraInstrs)) { NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-Not-Niagara");) features &= ~(T_family_m | T1_model_m); } else { // Happy to accomodate... } } return features; } static int saved_features = 0; void VM_Version::allow_all() { saved_features = _features; _features = all_features_m; } void VM_Version::revert() { _features = saved_features; } unsigned int VM_Version::calc_parallel_worker_threads() { unsigned int result; if (is_niagara_plus()) { result = nof_parallel_worker_threads(5, 16, 8); } else { result = nof_parallel_worker_threads(5, 8, 8); } return result; }