Mercurial > hg > graal-compiler
view src/share/vm/gc_implementation/g1/g1StringDedupStat.hpp @ 20543:e7d0505c8a30
8059758: Footprint regressions with JDK-8038423
Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything.
Reviewed-by: jwilhelm, brutisso
author | tschatzl |
---|---|
date | Fri, 10 Oct 2014 15:51:58 +0200 |
parents | 595c0f60d50d |
children |
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/* * Copyright (c) 2014, 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. * */ #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1STRINGDEDUPSTAT_HPP #define SHARE_VM_GC_IMPLEMENTATION_G1_G1STRINGDEDUPSTAT_HPP #include "memory/allocation.hpp" #include "runtime/os.hpp" // Macros for GC log output formating #define G1_STRDEDUP_OBJECTS_FORMAT UINTX_FORMAT_W(12) #define G1_STRDEDUP_TIME_FORMAT "%1.7lf secs" #define G1_STRDEDUP_PERCENT_FORMAT "%5.1lf%%" #define G1_STRDEDUP_PERCENT_FORMAT_NS "%.1lf%%" #define G1_STRDEDUP_BYTES_FORMAT "%8.1lf%s" #define G1_STRDEDUP_BYTES_FORMAT_NS "%.1lf%s" #define G1_STRDEDUP_BYTES_PARAM(bytes) byte_size_in_proper_unit((double)(bytes)), proper_unit_for_byte_size((bytes)) // // Statistics gathered by the deduplication thread. // class G1StringDedupStat : public StackObj { private: // Counters uintx _inspected; uintx _skipped; uintx _hashed; uintx _known; uintx _new; uintx _new_bytes; uintx _deduped; uintx _deduped_bytes; uintx _deduped_young; uintx _deduped_young_bytes; uintx _deduped_old; uintx _deduped_old_bytes; uintx _idle; uintx _exec; uintx _block; // Time spent by the deduplication thread in different phases double _start; double _idle_elapsed; double _exec_elapsed; double _block_elapsed; public: G1StringDedupStat(); void inc_inspected() { _inspected++; } void inc_skipped() { _skipped++; } void inc_hashed() { _hashed++; } void inc_known() { _known++; } void inc_new(uintx bytes) { _new++; _new_bytes += bytes; } void inc_deduped_young(uintx bytes) { _deduped++; _deduped_bytes += bytes; _deduped_young++; _deduped_young_bytes += bytes; } void inc_deduped_old(uintx bytes) { _deduped++; _deduped_bytes += bytes; _deduped_old++; _deduped_old_bytes += bytes; } void mark_idle() { _start = os::elapsedTime(); _idle++; } void mark_exec() { double now = os::elapsedTime(); _idle_elapsed = now - _start; _start = now; _exec++; } void mark_block() { double now = os::elapsedTime(); _exec_elapsed += now - _start; _start = now; _block++; } void mark_unblock() { double now = os::elapsedTime(); _block_elapsed += now - _start; _start = now; } void mark_done() { double now = os::elapsedTime(); _exec_elapsed += now - _start; } void add(const G1StringDedupStat& stat); static void print_summary(outputStream* st, const G1StringDedupStat& last_stat, const G1StringDedupStat& total_stat); static void print_statistics(outputStream* st, const G1StringDedupStat& stat, bool total); }; #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1STRINGDEDUPSTAT_HPP