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src/share/vm/jfr/recorder/checkpoint/jfrMetadataEvent.cpp@a248d0be1309 (annotated)

src/share/vm/jfr/recorder/checkpoint/jfrMetadataEvent.cpp

Mon, 19 Aug 2019 10:11:31 +0200

author

neugens

date

Mon, 19 Aug 2019 10:11:31 +0200

changeset 9861

a248d0be1309

parent 9858

b985cbb00e68

permissions

-rw-r--r--

8229401: Fix JFR code cache test failures
8223689: Add JFR Thread Sampling Support
8223690: Add JFR BiasedLock Event Support
8223691: Add JFR G1 Region Type Change Event Support
8223692: Add JFR G1 Heap Summary Event Support
Summary: Backport JFR from JDK11, additional fixes
Reviewed-by: neugens, apetushkov
Contributed-by: denghui.ddh@alibaba-inc.com

apetushkov@9858	1	/*
apetushkov@9858	2	* Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
apetushkov@9858	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
apetushkov@9858	4	*
apetushkov@9858	5	* This code is free software; you can redistribute it and/or modify it
apetushkov@9858	6	* under the terms of the GNU General Public License version 2 only, as
apetushkov@9858	7	* published by the Free Software Foundation.
apetushkov@9858	8	*
apetushkov@9858	9	* This code is distributed in the hope that it will be useful, but WITHOUT
apetushkov@9858	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
apetushkov@9858	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
apetushkov@9858	12	* version 2 for more details (a copy is included in the LICENSE file that
apetushkov@9858	13	* accompanied this code).
apetushkov@9858	14	*
apetushkov@9858	15	* You should have received a copy of the GNU General Public License version
apetushkov@9858	16	* 2 along with this work; if not, write to the Free Software Foundation,
apetushkov@9858	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
apetushkov@9858	18	*
apetushkov@9858	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
apetushkov@9858	20	* or visit www.oracle.com if you need additional information or have any
apetushkov@9858	21	* questions.
apetushkov@9858	22	*
apetushkov@9858	23	*/
apetushkov@9858	24
apetushkov@9858	25	#include "precompiled.hpp"
apetushkov@9858	26	#include "jfr/jni/jfrJavaSupport.hpp"
apetushkov@9858	27	#include "jfr/recorder/checkpoint/jfrMetadataEvent.hpp"
apetushkov@9858	28	#include "jfr/recorder/repository/jfrChunkWriter.hpp"
apetushkov@9858	29	#include "oops/klass.inline.hpp"
apetushkov@9858	30	#include "oops/oop.inline.hpp"
apetushkov@9858	31	#include "oops/typeArrayOop.hpp"
apetushkov@9858	32	#include "runtime/semaphore.hpp"
apetushkov@9858	33	#include "runtime/thread.inline.hpp"
apetushkov@9858	34
apetushkov@9858	35	static jbyteArray _metadata_blob = NULL;
apetushkov@9858	36	static Semaphore metadata_mutex_semaphore(1);
apetushkov@9858	37
apetushkov@9858	38	void JfrMetadataEvent::lock() {
apetushkov@9858	39	metadata_mutex_semaphore.wait();
apetushkov@9858	40	}
apetushkov@9858	41
apetushkov@9858	42	void JfrMetadataEvent::unlock() {
apetushkov@9858	43	metadata_mutex_semaphore.signal();
apetushkov@9858	44	}
apetushkov@9858	45
apetushkov@9858	46	static void write_metadata_blob(JfrChunkWriter& chunkwriter, jbyteArray metadata_blob) {
apetushkov@9858	47	if (metadata_blob != NULL) {
apetushkov@9858	48	const typeArrayOop arr = (typeArrayOop)JfrJavaSupport::resolve_non_null(metadata_blob);
apetushkov@9858	49	assert(arr != NULL, "invariant");
apetushkov@9858	50	const int length = arr->length();
apetushkov@9858	51	Klass* const k = arr->klass();
apetushkov@9858	52	assert(k != NULL && k->oop_is_array(), "invariant");
apetushkov@9858	53	const TypeArrayKlass* const byte_arr_klass = TypeArrayKlass::cast(k);
apetushkov@9858	54	const jbyte* const data_address = arr->byte_at_addr(0);
apetushkov@9858	55	chunkwriter.write_unbuffered(data_address, length);
apetushkov@9858	56	}
apetushkov@9858	57	}
apetushkov@9858	58
apetushkov@9858	59	// the semaphore is assumed to be locked (was locked previous safepoint)
apetushkov@9858	60	size_t JfrMetadataEvent::write(JfrChunkWriter& chunkwriter, jlong metadata_offset) {
apetushkov@9858	61	assert(chunkwriter.is_valid(), "invariant");
apetushkov@9858	62	assert(chunkwriter.current_offset() == metadata_offset, "invariant");
apetushkov@9858	63	// header
apetushkov@9858	64	chunkwriter.reserve(sizeof(u4));
apetushkov@9858	65	chunkwriter.write<u8>(EVENT_METADATA); // ID 0
apetushkov@9858	66	// time data
apetushkov@9858	67	chunkwriter.write(JfrTicks::now());
apetushkov@9858	68	chunkwriter.write((u8)0); // duration
apetushkov@9858	69	chunkwriter.write((u8)0); // metadata id
apetushkov@9858	70	write_metadata_blob(chunkwriter, _metadata_blob); // payload
apetushkov@9858	71	unlock(); // open up for java to provide updated metadata
apetushkov@9858	72	// fill in size of metadata descriptor event
apetushkov@9858	73	const jlong size_written = chunkwriter.current_offset() - metadata_offset;
apetushkov@9858	74	chunkwriter.write_padded_at_offset((u4)size_written, metadata_offset);
apetushkov@9858	75	return size_written;
apetushkov@9858	76	}
apetushkov@9858	77
apetushkov@9858	78	void JfrMetadataEvent::update(jbyteArray metadata) {
apetushkov@9858	79	JavaThread* thread = (JavaThread*)Thread::current();
apetushkov@9858	80	assert(thread->is_Java_thread(), "invariant");
apetushkov@9858	81	DEBUG_ONLY(JfrJavaSupport::check_java_thread_in_vm(thread));
apetushkov@9858	82	lock();
apetushkov@9858	83	if (_metadata_blob != NULL) {
apetushkov@9858	84	JfrJavaSupport::destroy_global_jni_handle(_metadata_blob);
apetushkov@9858	85	}
apetushkov@9858	86	const oop new_desc_oop = JfrJavaSupport::resolve_non_null(metadata);
apetushkov@9858	87	_metadata_blob = new_desc_oop != NULL ? (jbyteArray)JfrJavaSupport::global_jni_handle(new_desc_oop, thread) : NULL;
apetushkov@9858	88	unlock();
apetushkov@9858	89	}