/*
* Copyright ( c ) 2018 , 2022 , Oracle and / or its affiliates . All rights reserved .
* Copyright ( c ) 2018 , 2022 SAP SE . 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
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*/
#include "precompiled.hpp"
#include "memory/metaspace.hpp"
#include "memory/metaspace/metaspaceDCmd.hpp"
#include "memory/metaspace/metaspaceReporter.hpp"
#include "memory/metaspaceUtils.hpp"
#include "memory/resourceArea.hpp"
#include "runtime/vmOperations.hpp"
#include "services/diagnosticCommand.hpp"
#include "services/nmtCommon.hpp"
namespace metaspace {
MetaspaceDCmd::MetaspaceDCmd(outputStream* output, bool heap) :
DCmdWithParser(output, heap),
_basic("basic" , "Prints a basic summary (does not need a safepoint)." , "BOOLEAN" , false , "false" ),
_show_loaders("show-loaders" , "Shows usage by class loader." , "BOOLEAN" , false , "false" ),
_by_spacetype("by-spacetype" , "Break down numbers by loader type." , "BOOLEAN" , false , "false" ),
_by_chunktype("by-chunktype" , "Break down numbers by chunk type." , "BOOLEAN" , false , "false" ),
_show_vslist("vslist" , "Shows details about the underlying virtual space." , "BOOLEAN" , false , "false" ),
_show_chunkfreelist("chunkfreelist" , "Shows details about global chunk free lists (ChunkManager)." , "BOOLEAN" , false , "false" ),
_scale("scale" , "Memory usage in which to scale. Valid values are: 1, KB, MB or GB (fixed scale) "
"or \" dynamic\" for a dynamically chosen scale." ,
"STRING" , false , "dynamic" ),
_show_classes("show-classes" , "If show-loaders is set, shows loaded classes for each loader." , "BOOLEAN" , false , "false" )
{
_dcmdparser.add_dcmd_option(&_basic);
_dcmdparser.add_dcmd_option(&_show_loaders);
_dcmdparser.add_dcmd_option(&_show_classes);
_dcmdparser.add_dcmd_option(&_by_chunktype);
_dcmdparser.add_dcmd_option(&_by_spacetype);
_dcmdparser.add_dcmd_option(&_show_vslist);
_dcmdparser.add_dcmd_option(&_show_chunkfreelist);
_dcmdparser.add_dcmd_option(&_scale);
}
int MetaspaceDCmd::num_arguments() {
ResourceMark rm;
MetaspaceDCmd* dcmd = new MetaspaceDCmd(NULL, false );
if (dcmd != NULL) {
DCmdMark mark(dcmd);
return dcmd->_dcmdparser.num_arguments();
} else {
return 0 ;
}
}
void MetaspaceDCmd::execute(DCmdSource source, TRAPS) {
// Parse scale value.
const char * scale_value = _scale.value();
size_t scale = 0 ;
if (scale_value != NULL) {
if (strcasecmp("dynamic" , scale_value) == 0 ) {
scale = 0 ;
} else {
scale = NMTUtil::scale_from_name(scale_value);
if (scale == 0 ) {
output()->print_cr("Invalid scale: \" %s\". Will use dynamic scaling." , scale_value);
}
}
}
if (_basic.value() == true ) {
if (_show_loaders.value() || _by_chunktype.value() || _by_spacetype.value() ||
_show_vslist.value()) {
// Basic mode. Just print essentials. Does not need to be at a safepoint.
output()->print_cr("In basic mode, additional arguments are ignored." );
}
MetaspaceUtils::print_basic_report(output(), scale);
} else {
// Full mode. Requires safepoint.
int flags = 0 ;
if (_show_loaders.value()) flags |= (int )MetaspaceReporter::Option::ShowLoaders;
if (_show_classes.value()) flags |= (int )MetaspaceReporter::Option::ShowClasses;
if (_by_chunktype.value()) flags |= (int )MetaspaceReporter::Option::BreakDownByChunkType;
if (_by_spacetype.value()) flags |= (int )MetaspaceReporter::Option::BreakDownBySpaceType;
if (_show_vslist.value()) flags |= (int )MetaspaceReporter::Option::ShowVSList;
if (_show_chunkfreelist.value()) flags |= (int )MetaspaceReporter::Option::ShowChunkFreeList;
VM_PrintMetadata op(output(), scale, flags);
VMThread::execute(&op);
}
}
} // namespace metaspace
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(vorverarbeitet am 2026-09-11)
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