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comparison src/cpu/x86/vm/rtmLocking.cpp @ 17780:606acabe7b5c

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8031320: Use Intel RTM instructions for locks Summary: Use RTM for inflated locks and stack locks. Reviewed-by: iveresov, twisti, roland, dcubed
author kvn
date Thu, 20 Mar 2014 17:49:27 -0700
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children 52b37289e3be
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17778:a48e16541e6b 17780:606acabe7b5c
1 /*
2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "runtime/task.hpp"
27 #include "runtime/rtmLocking.hpp"
28
29 // One-shot PeriodicTask subclass for enabling RTM locking
30 uintx RTMLockingCounters::_calculation_flag = 0;
31
32 class RTMLockingCalculationTask : public PeriodicTask {
33 public:
34 RTMLockingCalculationTask(size_t interval_time) : PeriodicTask(interval_time){ }
35
36 virtual void task() {
37 RTMLockingCounters::_calculation_flag = 1;
38 // Reclaim our storage and disenroll ourself
39 delete this;
40 }
41 };
42
43 void RTMLockingCounters::init() {
44 if (UseRTMLocking && RTMLockingCalculationDelay > 0) {
45 RTMLockingCalculationTask* task = new RTMLockingCalculationTask(RTMLockingCalculationDelay);
46 task->enroll();
47 } else {
48 _calculation_flag = 1;
49 }
50 }
51
52 //------------------------------print_on-------------------------------
53 void RTMLockingCounters::print_on(outputStream* st) {
54 tty->print_cr("# rtm locks total (estimated): " UINTX_FORMAT, _total_count * RTMTotalCountIncrRate);
55 tty->print_cr("# rtm lock aborts : " UINTX_FORMAT, _abort_count);
56 for (int i = 0; i < ABORT_STATUS_LIMIT; i++) {
57 tty->print_cr("# rtm lock aborts %d: " UINTX_FORMAT, i, _abortX_count[i]);
58 }
59 }