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src/share/vm/gc_implementation/shared/gcTraceTime.cpp@55a0da3d420b (annotated)

src/share/vm/gc_implementation/shared/gcTraceTime.cpp

Tue, 26 Nov 2013 14:35:38 +0100

author

sjohanss

date

Tue, 26 Nov 2013 14:35:38 +0100

changeset 6148

55a0da3d420b

parent 5237

f2110083203d

child 6131

86e6d691f2e1

permissions

-rw-r--r--

8027675: Full collections with Serial slower in JDK 8 compared to 7u40
Summary: Reduced the number of calls to follow_class_loader and instead marked and pushed the klass holder directly. Also removed unneeded calls to adjust_klass.
Reviewed-by: coleenp, jmasa, mgerdin, tschatzl

sla@5237	1	/*
sla@5237	2	* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
sla@5237	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
sla@5237	4	*
sla@5237	5	* This code is free software; you can redistribute it and/or modify it
sla@5237	6	* under the terms of the GNU General Public License version 2 only, as
sla@5237	7	* published by the Free Software Foundation.
sla@5237	8	*
sla@5237	9	* This code is distributed in the hope that it will be useful, but WITHOUT
sla@5237	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
sla@5237	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
sla@5237	12	* version 2 for more details (a copy is included in the LICENSE file that
sla@5237	13	* accompanied this code).
sla@5237	14	*
sla@5237	15	* You should have received a copy of the GNU General Public License version
sla@5237	16	* 2 along with this work; if not, write to the Free Software Foundation,
sla@5237	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
sla@5237	18	*
sla@5237	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
sla@5237	20	* or visit www.oracle.com if you need additional information or have any
sla@5237	21	* questions.
sla@5237	22	*
sla@5237	23	*/
sla@5237	24
sla@5237	25	#include "precompiled.hpp"
sla@5237	26	#include "gc_implementation/shared/gcTimer.hpp"
sla@5237	27	#include "gc_implementation/shared/gcTraceTime.hpp"
sla@5237	28	#include "runtime/globals.hpp"
sla@5237	29	#include "runtime/os.hpp"
sla@5237	30	#include "runtime/safepoint.hpp"
sla@5237	31	#include "runtime/thread.inline.hpp"
sla@5237	32	#include "runtime/timer.hpp"
sla@5237	33	#include "utilities/ostream.hpp"
sla@5237	34
sla@5237	35
sla@5237	36	GCTraceTime::GCTraceTime(const char* title, bool doit, bool print_cr, GCTimer* timer) :
sla@5237	37	_title(title), _doit(doit), _print_cr(print_cr), _timer(timer) {
sla@5237	38	if (_doit || _timer != NULL) {
sla@5237	39	_start_counter = os::elapsed_counter();
sla@5237	40	}
sla@5237	41
sla@5237	42	if (_timer != NULL) {
sla@5237	43	assert(SafepointSynchronize::is_at_safepoint(), "Tracing currently only supported at safepoints");
sla@5237	44	assert(Thread::current()->is_VM_thread(), "Tracing currently only supported from the VM thread");
sla@5237	45
sla@5237	46	_timer->register_gc_phase_start(title, _start_counter);
sla@5237	47	}
sla@5237	48
sla@5237	49	if (_doit) {
sla@5237	50	if (PrintGCTimeStamps) {
sla@5237	51	gclog_or_tty->stamp();
sla@5237	52	gclog_or_tty->print(": ");
sla@5237	53	}
sla@5237	54	gclog_or_tty->print("[%s", title);
sla@5237	55	gclog_or_tty->flush();
sla@5237	56	}
sla@5237	57	}
sla@5237	58
sla@5237	59	GCTraceTime::~GCTraceTime() {
sla@5237	60	jlong stop_counter = 0;
sla@5237	61
sla@5237	62	if (_doit || _timer != NULL) {
sla@5237	63	stop_counter = os::elapsed_counter();
sla@5237	64	}
sla@5237	65
sla@5237	66	if (_timer != NULL) {
sla@5237	67	_timer->register_gc_phase_end(stop_counter);
sla@5237	68	}
sla@5237	69
sla@5237	70	if (_doit) {
sla@5237	71	double seconds = TimeHelper::counter_to_seconds(stop_counter - _start_counter);
sla@5237	72	if (_print_cr) {
sla@5237	73	gclog_or_tty->print_cr(", %3.7f secs]", seconds);
sla@5237	74	} else {
sla@5237	75	gclog_or_tty->print(", %3.7f secs]", seconds);
sla@5237	76	}
sla@5237	77	gclog_or_tty->flush();
sla@5237	78	}
sla@5237	79	}