Mercurial > hg > truffle
view src/share/vm/runtime/aprofiler.cpp @ 1145:e018e6884bd8
6631166: CMS: better heuristics when combatting fragmentation
Summary: Autonomic per-worker free block cache sizing, tunable coalition policies, fixes to per-size block statistics, retuned gain and bandwidth of some feedback loop filters to allow quicker reactivity to abrupt changes in ambient demand, and other heuristics to reduce fragmentation of the CMS old gen. Also tightened some assertions, including those related to locking.
Reviewed-by: jmasa
author | ysr |
---|---|
date | Wed, 23 Dec 2009 09:23:54 -0800 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
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/* * Copyright 1997-2002 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ # include "incls/_precompiled.incl" # include "incls/_aprofiler.cpp.incl" bool AllocationProfiler::_active = false; GrowableArray<klassOop>* AllocationProfiler::_print_array = NULL; class AllocProfClosure : public ObjectClosure { public: void do_object(oop obj) { Klass* k = obj->blueprint(); k->set_alloc_count(k->alloc_count() + 1); k->set_alloc_size(k->alloc_size() + obj->size()); } }; #ifndef PRODUCT class AllocProfResetClosure : public ObjectClosure { public: void do_object(oop obj) { if (obj->is_klass()) { Klass* k = Klass::cast(klassOop(obj)); k->set_alloc_count(0); k->set_alloc_size(0); } } }; #endif void AllocationProfiler::iterate_since_last_gc() { if (is_active()) { AllocProfClosure blk; GenCollectedHeap* heap = GenCollectedHeap::heap(); heap->object_iterate_since_last_GC(&blk); } } void AllocationProfiler::engage() { _active = true; } void AllocationProfiler::disengage() { _active = false; } void AllocationProfiler::add_class_to_array(klassOop k) { _print_array->append(k); } void AllocationProfiler::add_classes_to_array(klassOop k) { // Iterate over klass and all array klasses for klass k->klass_part()->with_array_klasses_do(&AllocationProfiler::add_class_to_array); } int AllocationProfiler::compare_classes(klassOop* k1, klassOop* k2) { // Sort by total allocation size return (*k2)->klass_part()->alloc_size() - (*k1)->klass_part()->alloc_size(); } int AllocationProfiler::average(size_t alloc_size, int alloc_count) { return (int) ((double) (alloc_size * BytesPerWord) / MAX2(alloc_count, 1) + 0.5); } void AllocationProfiler::sort_and_print_array(size_t cutoff) { _print_array->sort(&AllocationProfiler::compare_classes); tty->print_cr("________________Size" "__Instances" "__Average" "__Class________________"); size_t total_alloc_size = 0; int total_alloc_count = 0; for (int index = 0; index < _print_array->length(); index++) { klassOop k = _print_array->at(index); size_t alloc_size = k->klass_part()->alloc_size(); if (alloc_size > cutoff) { int alloc_count = k->klass_part()->alloc_count(); #ifdef PRODUCT const char* name = k->klass_part()->external_name(); #else const char* name = k->klass_part()->internal_name(); #endif tty->print_cr("%20u %10u %8u %s", alloc_size * BytesPerWord, alloc_count, average(alloc_size, alloc_count), name); total_alloc_size += alloc_size; total_alloc_count += alloc_count; } } tty->print_cr("%20u %10u %8u --total--", total_alloc_size * BytesPerWord, total_alloc_count, average(total_alloc_size, total_alloc_count)); tty->cr(); } void AllocationProfiler::print(size_t cutoff) { ResourceMark rm; assert(!is_active(), "AllocationProfiler cannot be active while printing profile"); tty->cr(); tty->print_cr("Allocation profile (sizes in bytes, cutoff = %ld bytes):", cutoff * BytesPerWord); tty->cr(); // Print regular instance klasses and basic type array klasses _print_array = new GrowableArray<klassOop>(SystemDictionary::number_of_classes()*2); SystemDictionary::classes_do(&add_classes_to_array); Universe::basic_type_classes_do(&add_classes_to_array); sort_and_print_array(cutoff); #ifndef PRODUCT tty->print_cr("Allocation profile for system classes (sizes in bytes, cutoff = %d bytes):", cutoff * BytesPerWord); tty->cr(); // Print system klasses (methods, symbols, constant pools, etc.) _print_array = new GrowableArray<klassOop>(64); Universe::system_classes_do(&add_classes_to_array); sort_and_print_array(cutoff); tty->print_cr("Permanent generation dump (sizes in bytes, cutoff = %d bytes):", cutoff * BytesPerWord); tty->cr(); AllocProfResetClosure resetblk; Universe::heap()->permanent_object_iterate(&resetblk); AllocProfClosure blk; Universe::heap()->permanent_object_iterate(&blk); _print_array = new GrowableArray<klassOop>(SystemDictionary::number_of_classes()*2); SystemDictionary::classes_do(&add_classes_to_array); Universe::basic_type_classes_do(&add_classes_to_array); Universe::system_classes_do(&add_classes_to_array); sort_and_print_array(cutoff); #endif }