/*
* Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
#include "jfr/recorder/repository/jfrChunk.hpp"
#include "jfr/recorder/repository/jfrChunkWriter.hpp"
#include "jfr/utilities/jfrTime.hpp"
#include "runtime/mutexLocker.hpp"
#include "runtime/os.inline.hpp"
static const int64_t MAGIC_OFFSET = 0;
static const int64_t MAGIC_LEN = 4;
static const int64_t VERSION_OFFSET = MAGIC_LEN;
static const int64_t SIZE_OFFSET = 8;
static const int64_t SLOT_SIZE = 8;
static const int64_t CHECKPOINT_OFFSET = SIZE_OFFSET + SLOT_SIZE;
static const int64_t METADATA_OFFSET = CHECKPOINT_OFFSET + SLOT_SIZE;
static const int64_t START_NANOS_OFFSET = METADATA_OFFSET + SLOT_SIZE;
static const int64_t DURATION_NANOS_OFFSET = START_NANOS_OFFSET + SLOT_SIZE;
static const int64_t START_TICKS_OFFSET = DURATION_NANOS_OFFSET + SLOT_SIZE;
static const int64_t CPU_FREQUENCY_OFFSET = START_TICKS_OFFSET + SLOT_SIZE;
static const int64_t GENERATION_OFFSET = CPU_FREQUENCY_OFFSET + SLOT_SIZE;
static const int64_t FLAG_OFFSET = GENERATION_OFFSET + 2;
static const int64_t HEADER_SIZE = FLAG_OFFSET + 2;
static fio_fd open_chunk(const char* path) {
return path != NULL ? os::open(path, O_CREAT | O_RDWR, S_IREAD | S_IWRITE) : invalid_fd;
}
#ifdef ASSERT
static void assert_writer_position(JfrChunkWriter* writer, int64_t offset) {
assert(writer != NULL, "invariant");
assert(offset == writer->current_offset(), "invariant");
}
#endif
class JfrChunkHeadWriter : public StackObj {
private:
JfrChunkWriter* _writer;
JfrChunk* _chunk;
public:
void write_magic() {
_writer->bytes(_chunk->magic(), MAGIC_LEN);
}
void write_version() {
_writer->be_write(_chunk->major_version());
_writer->be_write(_chunk->minor_version());
}
void write_size(int64_t size) {
_writer->be_write(size);
}
void write_checkpoint() {
_writer->be_write(_chunk->last_checkpoint_offset());
}
void write_metadata() {
_writer->be_write(_chunk->last_metadata_offset());
}
void write_time(bool finalize) {
if (finalize) {
_writer->be_write(_chunk->previous_start_nanos());
_writer->be_write(_chunk->last_chunk_duration());
_writer->be_write(_chunk->previous_start_ticks());
return;
}
_writer->be_write(_chunk->start_nanos());
_writer->be_write(_chunk->duration());
_writer->be_write(_chunk->start_ticks());
}
void write_cpu_frequency() {
_writer->be_write(_chunk->cpu_frequency());
}
void write_generation(bool finalize) {
_writer->be_write(finalize ? COMPLETE : _chunk->generation());
_writer->be_write(PAD);
}
void write_next_generation() {
_writer->be_write(_chunk->next_generation());
_writer->be_write(PAD);
}
void write_guard() {
_writer->be_write(GUARD);
_writer->be_write(PAD);
}
void write_guard_flush() {
write_guard();
_writer->flush();
}
void write_flags() {
_writer->be_write(_chunk->flags());
}
void write_size_to_generation(int64_t size, bool finalize) {
write_size(size);
write_checkpoint();
write_metadata();
write_time(finalize);
write_cpu_frequency();
write_generation(finalize);
}
void flush(int64_t size, bool finalize) {
assert(_writer->is_valid(), "invariant");
assert(_chunk != NULL, "invariant");
DEBUG_ONLY(assert_writer_position(_writer, SIZE_OFFSET);)
write_size_to_generation(size, finalize);
write_flags();
_writer->seek(size); // implicit flush
}
void initialize() {
assert(_writer->is_valid(), "invariant");
assert(_chunk != NULL, "invariant");
DEBUG_ONLY(assert_writer_position(_writer, 0);)
write_magic();
write_version();
write_size_to_generation(HEADER_SIZE, false);
write_flags();
DEBUG_ONLY(assert_writer_position(_writer, HEADER_SIZE);)
_writer->flush();
}
JfrChunkHeadWriter(JfrChunkWriter* writer, int64_t offset, bool guard = true) : _writer(writer), _chunk(writer->_chunk) {
assert(_writer != NULL, "invariant");
assert(_writer->is_valid(), "invariant");
assert(_chunk != NULL, "invariant");
if (0 == _writer->current_offset()) {
assert(HEADER_SIZE == offset, "invariant");
initialize();
} else {
if (guard) {
_writer->seek(GENERATION_OFFSET);
write_guard();
_writer->seek(offset);
} else {
_chunk->update_current_nanos();
}
}
DEBUG_ONLY(assert_writer_position(_writer, offset);)
}
};
static int64_t prepare_chunk_header_constant_pool(JfrChunkWriter& cw, int64_t event_offset, bool flushpoint) {
const int64_t delta = cw.last_checkpoint_offset() == 0 ? 0 : cw.last_checkpoint_offset() - event_offset;
const u4 checkpoint_type = flushpoint ? (u4)(FLUSH | HEADER) : (u4)HEADER;
cw.reserve(sizeof(u4));
cw.write<u8>(EVENT_CHECKPOINT);
cw.write<u8>(JfrTicks::now().value());
cw.write<u8>(0); // duration
cw.write<u8>(delta); // to previous checkpoint
cw.write<u4>(checkpoint_type);
cw.write<u4>(1); // pool count
cw.write<u8>(TYPE_CHUNKHEADER);
cw.write<u4>(1); // count
cw.write<u8>(1); // key
cw.write<u4>(HEADER_SIZE); // length of byte array
return cw.current_offset();
}
int64_t JfrChunkWriter::write_chunk_header_checkpoint(bool flushpoint) {
assert(this->has_valid_fd(), "invariant");
const int64_t event_size_offset = current_offset();
const int64_t header_content_pos = prepare_chunk_header_constant_pool(*this, event_size_offset, flushpoint);
JfrChunkHeadWriter head(this, header_content_pos, false);
head.write_magic();
head.write_version();
const int64_t chunk_size_offset = reserve(sizeof(int64_t)); // size to be decided when we are done
be_write(event_size_offset); // last checkpoint offset will be this checkpoint
head.write_metadata();
head.write_time(false);
head.write_cpu_frequency();
head.write_next_generation();
head.write_flags();
assert(current_offset() - header_content_pos == HEADER_SIZE, "invariant");
const u4 checkpoint_size = current_offset() - event_size_offset;
write_padded_at_offset<u4>(checkpoint_size, event_size_offset);
set_last_checkpoint_offset(event_size_offset);
const size_t sz_written = size_written();
write_be_at_offset(sz_written, chunk_size_offset);
return sz_written;
}
void JfrChunkWriter::mark_chunk_final() {
assert(_chunk != NULL, "invariant");
_chunk->mark_final();
}
int64_t JfrChunkWriter::flush_chunk(bool flushpoint) {
assert(_chunk != NULL, "invariant");
const int64_t sz_written = write_chunk_header_checkpoint(flushpoint);
assert(size_written() == sz_written, "invariant");
JfrChunkHeadWriter head(this, SIZE_OFFSET);
head.flush(sz_written, !flushpoint);
return sz_written;
}
JfrChunkWriter::JfrChunkWriter() : JfrChunkWriterBase(NULL), _chunk(new JfrChunk()) {}
JfrChunkWriter::~JfrChunkWriter() {
assert(_chunk != NULL, "invariant");
delete _chunk;
}
void JfrChunkWriter::set_path(const char* path) {
assert(_chunk != NULL, "invariant");
_chunk->set_path(path);
}
void JfrChunkWriter::set_time_stamp() {
assert(_chunk != NULL, "invariant");
_chunk->set_time_stamp();
}
int64_t JfrChunkWriter::size_written() const {
return this->is_valid() ? this->current_offset() : 0;
}
int64_t JfrChunkWriter::last_checkpoint_offset() const {
assert(_chunk != NULL, "invariant");
return _chunk->last_checkpoint_offset();
}
int64_t JfrChunkWriter::current_chunk_start_nanos() const {
assert(_chunk != NULL, "invariant");
return this->is_valid() ? _chunk->start_nanos() : invalid_time;
}
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