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src/share/vm/gc_implementation/g1/g1StringDedupStat.cpp@e7d0505c8a30 (annotated)

src/share/vm/gc_implementation/g1/g1StringDedupStat.cpp

Fri, 10 Oct 2014 15:51:58 +0200

author

tschatzl

date

Fri, 10 Oct 2014 15:51:58 +0200

changeset 7257

e7d0505c8a30

parent 0

f90c822e73f8

child 9327

f96fcd9e1e1b

permissions

-rw-r--r--

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

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#include "precompiled.hpp"
aoqi@0	26	#include "gc_implementation/g1/g1StringDedupStat.hpp"
aoqi@0	27
aoqi@0	28	G1StringDedupStat::G1StringDedupStat() :
aoqi@0	29	_inspected(0),
aoqi@0	30	_skipped(0),
aoqi@0	31	_hashed(0),
aoqi@0	32	_known(0),
aoqi@0	33	_new(0),
aoqi@0	34	_new_bytes(0),
aoqi@0	35	_deduped(0),
aoqi@0	36	_deduped_bytes(0),
aoqi@0	37	_deduped_young(0),
aoqi@0	38	_deduped_young_bytes(0),
aoqi@0	39	_deduped_old(0),
aoqi@0	40	_deduped_old_bytes(0),
aoqi@0	41	_idle(0),
aoqi@0	42	_exec(0),
aoqi@0	43	_block(0),
aoqi@0	44	_start(0.0),
aoqi@0	45	_idle_elapsed(0.0),
aoqi@0	46	_exec_elapsed(0.0),
aoqi@0	47	_block_elapsed(0.0) {
aoqi@0	48	}
aoqi@0	49
aoqi@0	50	void G1StringDedupStat::add(const G1StringDedupStat& stat) {
aoqi@0	51	_inspected += stat._inspected;
aoqi@0	52	_skipped += stat._skipped;
aoqi@0	53	_hashed += stat._hashed;
aoqi@0	54	_known += stat._known;
aoqi@0	55	_new += stat._new;
aoqi@0	56	_new_bytes += stat._new_bytes;
aoqi@0	57	_deduped += stat._deduped;
aoqi@0	58	_deduped_bytes += stat._deduped_bytes;
aoqi@0	59	_deduped_young += stat._deduped_young;
aoqi@0	60	_deduped_young_bytes += stat._deduped_young_bytes;
aoqi@0	61	_deduped_old += stat._deduped_old;
aoqi@0	62	_deduped_old_bytes += stat._deduped_old_bytes;
aoqi@0	63	_idle += stat._idle;
aoqi@0	64	_exec += stat._exec;
aoqi@0	65	_block += stat._block;
aoqi@0	66	_idle_elapsed += stat._idle_elapsed;
aoqi@0	67	_exec_elapsed += stat._exec_elapsed;
aoqi@0	68	_block_elapsed += stat._block_elapsed;
aoqi@0	69	}
aoqi@0	70
aoqi@0	71	void G1StringDedupStat::print_summary(outputStream* st, const G1StringDedupStat& last_stat, const G1StringDedupStat& total_stat) {
aoqi@0	72	double total_deduped_bytes_percent = 0.0;
aoqi@0	73
aoqi@0	74	if (total_stat._new_bytes > 0) {
aoqi@0	75	// Avoid division by zero
aoqi@0	76	total_deduped_bytes_percent = (double)total_stat._deduped_bytes / (double)total_stat._new_bytes * 100.0;
aoqi@0	77	}
aoqi@0	78
aoqi@0	79	st->date_stamp(PrintGCDateStamps);
aoqi@0	80	st->stamp(PrintGCTimeStamps);
aoqi@0	81	st->print_cr(
aoqi@0	82	"[GC concurrent-string-deduplication, "
aoqi@0	83	G1_STRDEDUP_BYTES_FORMAT_NS"->"G1_STRDEDUP_BYTES_FORMAT_NS"("G1_STRDEDUP_BYTES_FORMAT_NS"), avg "
aoqi@0	84	G1_STRDEDUP_PERCENT_FORMAT_NS", "G1_STRDEDUP_TIME_FORMAT"]",
aoqi@0	85	G1_STRDEDUP_BYTES_PARAM(last_stat._new_bytes),
aoqi@0	86	G1_STRDEDUP_BYTES_PARAM(last_stat._new_bytes - last_stat._deduped_bytes),
aoqi@0	87	G1_STRDEDUP_BYTES_PARAM(last_stat._deduped_bytes),
aoqi@0	88	total_deduped_bytes_percent,
aoqi@0	89	last_stat._exec_elapsed);
aoqi@0	90	}
aoqi@0	91
aoqi@0	92	void G1StringDedupStat::print_statistics(outputStream* st, const G1StringDedupStat& stat, bool total) {
aoqi@0	93	double young_percent = 0.0;
aoqi@0	94	double old_percent = 0.0;
aoqi@0	95	double skipped_percent = 0.0;
aoqi@0	96	double hashed_percent = 0.0;
aoqi@0	97	double known_percent = 0.0;
aoqi@0	98	double new_percent = 0.0;
aoqi@0	99	double deduped_percent = 0.0;
aoqi@0	100	double deduped_bytes_percent = 0.0;
aoqi@0	101	double deduped_young_percent = 0.0;
aoqi@0	102	double deduped_young_bytes_percent = 0.0;
aoqi@0	103	double deduped_old_percent = 0.0;
aoqi@0	104	double deduped_old_bytes_percent = 0.0;
aoqi@0	105
aoqi@0	106	if (stat._inspected > 0) {
aoqi@0	107	// Avoid division by zero
aoqi@0	108	skipped_percent = (double)stat._skipped / (double)stat._inspected * 100.0;
aoqi@0	109	hashed_percent = (double)stat._hashed / (double)stat._inspected * 100.0;
aoqi@0	110	known_percent = (double)stat._known / (double)stat._inspected * 100.0;
aoqi@0	111	new_percent = (double)stat._new / (double)stat._inspected * 100.0;
aoqi@0	112	}
aoqi@0	113
aoqi@0	114	if (stat._new > 0) {
aoqi@0	115	// Avoid division by zero
aoqi@0	116	deduped_percent = (double)stat._deduped / (double)stat._new * 100.0;
aoqi@0	117	}
aoqi@0	118
aoqi@0	119	if (stat._deduped > 0) {
aoqi@0	120	// Avoid division by zero
aoqi@0	121	deduped_young_percent = (double)stat._deduped_young / (double)stat._deduped * 100.0;
aoqi@0	122	deduped_old_percent = (double)stat._deduped_old / (double)stat._deduped * 100.0;
aoqi@0	123	}
aoqi@0	124
aoqi@0	125	if (stat._new_bytes > 0) {
aoqi@0	126	// Avoid division by zero
aoqi@0	127	deduped_bytes_percent = (double)stat._deduped_bytes / (double)stat._new_bytes * 100.0;
aoqi@0	128	}
aoqi@0	129
aoqi@0	130	if (stat._deduped_bytes > 0) {
aoqi@0	131	// Avoid division by zero
aoqi@0	132	deduped_young_bytes_percent = (double)stat._deduped_young_bytes / (double)stat._deduped_bytes * 100.0;
aoqi@0	133	deduped_old_bytes_percent = (double)stat._deduped_old_bytes / (double)stat._deduped_bytes * 100.0;
aoqi@0	134	}
aoqi@0	135
aoqi@0	136	if (total) {
aoqi@0	137	st->print_cr(
aoqi@0	138	" [Total Exec: "UINTX_FORMAT"/"G1_STRDEDUP_TIME_FORMAT", Idle: "UINTX_FORMAT"/"G1_STRDEDUP_TIME_FORMAT", Blocked: "UINTX_FORMAT"/"G1_STRDEDUP_TIME_FORMAT"]",
aoqi@0	139	stat._exec, stat._exec_elapsed, stat._idle, stat._idle_elapsed, stat._block, stat._block_elapsed);
aoqi@0	140	} else {
aoqi@0	141	st->print_cr(
aoqi@0	142	" [Last Exec: "G1_STRDEDUP_TIME_FORMAT", Idle: "G1_STRDEDUP_TIME_FORMAT", Blocked: "UINTX_FORMAT"/"G1_STRDEDUP_TIME_FORMAT"]",
aoqi@0	143	stat._exec_elapsed, stat._idle_elapsed, stat._block, stat._block_elapsed);
aoqi@0	144	}
aoqi@0	145	st->print_cr(
aoqi@0	146	" [Inspected: "G1_STRDEDUP_OBJECTS_FORMAT"]\n"
aoqi@0	147	" [Skipped: "G1_STRDEDUP_OBJECTS_FORMAT"("G1_STRDEDUP_PERCENT_FORMAT")]\n"
aoqi@0	148	" [Hashed: "G1_STRDEDUP_OBJECTS_FORMAT"("G1_STRDEDUP_PERCENT_FORMAT")]\n"
aoqi@0	149	" [Known: "G1_STRDEDUP_OBJECTS_FORMAT"("G1_STRDEDUP_PERCENT_FORMAT")]\n"
aoqi@0	150	" [New: "G1_STRDEDUP_OBJECTS_FORMAT"("G1_STRDEDUP_PERCENT_FORMAT") "G1_STRDEDUP_BYTES_FORMAT"]\n"
aoqi@0	151	" [Deduplicated: "G1_STRDEDUP_OBJECTS_FORMAT"("G1_STRDEDUP_PERCENT_FORMAT") "G1_STRDEDUP_BYTES_FORMAT"("G1_STRDEDUP_PERCENT_FORMAT")]\n"
aoqi@0	152	" [Young: "G1_STRDEDUP_OBJECTS_FORMAT"("G1_STRDEDUP_PERCENT_FORMAT") "G1_STRDEDUP_BYTES_FORMAT"("G1_STRDEDUP_PERCENT_FORMAT")]\n"
aoqi@0	153	" [Old: "G1_STRDEDUP_OBJECTS_FORMAT"("G1_STRDEDUP_PERCENT_FORMAT") "G1_STRDEDUP_BYTES_FORMAT"("G1_STRDEDUP_PERCENT_FORMAT")]",
aoqi@0	154	stat._inspected,
aoqi@0	155	stat._skipped, skipped_percent,
aoqi@0	156	stat._hashed, hashed_percent,
aoqi@0	157	stat._known, known_percent,
aoqi@0	158	stat._new, new_percent, G1_STRDEDUP_BYTES_PARAM(stat._new_bytes),
aoqi@0	159	stat._deduped, deduped_percent, G1_STRDEDUP_BYTES_PARAM(stat._deduped_bytes), deduped_bytes_percent,
aoqi@0	160	stat._deduped_young, deduped_young_percent, G1_STRDEDUP_BYTES_PARAM(stat._deduped_young_bytes), deduped_young_bytes_percent,
aoqi@0	161	stat._deduped_old, deduped_old_percent, G1_STRDEDUP_BYTES_PARAM(stat._deduped_old_bytes), deduped_old_bytes_percent);
aoqi@0	162	}