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src/cpu/x86/vm/rtmLocking.cpp@606acabe7b5c (annotated)

src/cpu/x86/vm/rtmLocking.cpp

Thu, 20 Mar 2014 17:49:27 -0700

author

kvn

date

Thu, 20 Mar 2014 17:49:27 -0700

changeset 6429

606acabe7b5c

child 6430

52b37289e3be

permissions

-rw-r--r--

8031320: Use Intel RTM instructions for locks
Summary: Use RTM for inflated locks and stack locks.
Reviewed-by: iveresov, twisti, roland, dcubed

kvn@6429	1	/*
kvn@6429	2	* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
kvn@6429	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
kvn@6429	4	*
kvn@6429	5	* This code is free software; you can redistribute it and/or modify it
kvn@6429	6	* under the terms of the GNU General Public License version 2 only, as
kvn@6429	7	* published by the Free Software Foundation.
kvn@6429	8	*
kvn@6429	9	* This code is distributed in the hope that it will be useful, but WITHOUT
kvn@6429	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
kvn@6429	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
kvn@6429	12	* version 2 for more details (a copy is included in the LICENSE file that
kvn@6429	13	* accompanied this code).
kvn@6429	14	*
kvn@6429	15	* You should have received a copy of the GNU General Public License version
kvn@6429	16	* 2 along with this work; if not, write to the Free Software Foundation,
kvn@6429	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
kvn@6429	18	*
kvn@6429	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
kvn@6429	20	* or visit www.oracle.com if you need additional information or have any
kvn@6429	21	* questions.
kvn@6429	22	*
kvn@6429	23	*/
kvn@6429	24
kvn@6429	25	#include "precompiled.hpp"
kvn@6429	26	#include "runtime/task.hpp"
kvn@6429	27	#include "runtime/rtmLocking.hpp"
kvn@6429	28
kvn@6429	29	// One-shot PeriodicTask subclass for enabling RTM locking
kvn@6429	30	uintx RTMLockingCounters::_calculation_flag = 0;
kvn@6429	31
kvn@6429	32	class RTMLockingCalculationTask : public PeriodicTask {
kvn@6429	33	public:
kvn@6429	34	RTMLockingCalculationTask(size_t interval_time) : PeriodicTask(interval_time){ }
kvn@6429	35
kvn@6429	36	virtual void task() {
kvn@6429	37	RTMLockingCounters::_calculation_flag = 1;
kvn@6429	38	// Reclaim our storage and disenroll ourself
kvn@6429	39	delete this;
kvn@6429	40	}
kvn@6429	41	};
kvn@6429	42
kvn@6429	43	void RTMLockingCounters::init() {
kvn@6429	44	if (UseRTMLocking && RTMLockingCalculationDelay > 0) {
kvn@6429	45	RTMLockingCalculationTask* task = new RTMLockingCalculationTask(RTMLockingCalculationDelay);
kvn@6429	46	task->enroll();
kvn@6429	47	} else {
kvn@6429	48	_calculation_flag = 1;
kvn@6429	49	}
kvn@6429	50	}
kvn@6429	51
kvn@6429	52	//------------------------------print_on-------------------------------
kvn@6429	53	void RTMLockingCounters::print_on(outputStream* st) {
kvn@6429	54	tty->print_cr("# rtm locks total (estimated): " UINTX_FORMAT, _total_count * RTMTotalCountIncrRate);
kvn@6429	55	tty->print_cr("# rtm lock aborts : " UINTX_FORMAT, _abort_count);
kvn@6429	56	for (int i = 0; i < ABORT_STATUS_LIMIT; i++) {
kvn@6429	57	tty->print_cr("# rtm lock aborts %d: " UINTX_FORMAT, i, _abortX_count[i]);
kvn@6429	58	}
kvn@6429	59	}