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/*
* Copyright (c) 2001, 2020, 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 "gc/shared/taskqueue.hpp"
#include "oops/oop.inline.hpp"
#include "logging/log.hpp"
#include "runtime/atomic.hpp"
#include "runtime/javaThread.hpp"
#include "runtime/os.hpp"
#include "utilities/debug.hpp"
#include "utilities/stack.inline.hpp"
#if TASKQUEUE_STATS
const char * const TaskQueueStats::_names[last_stat_id] = {
"push", "pop", "pop-slow",
"st-attempt", "st-empty", "st-ctdd", "st-success", "st-ctdd-max", "st-biasdrop",
"ovflw-push", "ovflw-max"
};
TaskQueueStats & TaskQueueStats::operator +=(const TaskQueueStats & addend)
{
for (unsigned int i = 0; i < last_stat_id; ++i) {
_stats[i] += addend._stats[i];
}
return *this;
}
void TaskQueueStats::print_header(unsigned int line, outputStream* const stream,
unsigned int width)
{
// Use a width w: 1 <= w <= max_width
const unsigned int max_width = 40;
const unsigned int w = clamp(width, 1u, max_width);
if (line == 0) { // spaces equal in width to the header
const unsigned int hdr_width = w * last_stat_id + last_stat_id - 1;
stream->print("%*s", hdr_width, " ");
} else if (line == 1) { // labels
stream->print("%*s", w, _names[0]);
for (unsigned int i = 1; i < last_stat_id; ++i) {
stream->print(" %*s", w, _names[i]);
}
} else if (line == 2) { // dashed lines
char dashes[max_width + 1];
memset(dashes, '-', w);
dashes[w] = '\0';
stream->print("%s", dashes);
for (unsigned int i = 1; i < last_stat_id; ++i) {
stream->print(" %s", dashes);
}
}
}
void TaskQueueStats::print(outputStream* stream, unsigned int width) const
{
#define FMT SIZE_FORMAT_W(*)
stream->print(FMT, width, _stats[0]);
for (unsigned int i = 1; i < last_stat_id; ++i) {
stream->print(" " FMT, width, _stats[i]);
}
#undef FMT
}
#ifdef ASSERT
// Invariants which should hold after a TaskQueue has been emptied and is
// quiescent; they do not hold at arbitrary times.
void TaskQueueStats::verify() const
{
assert(get(push) == get(pop) + get(steal_success),
"push=%zu pop=%zu steal=%zu",
get(push), get(pop), get(steal_success));
assert(get(pop_slow) <= get(pop),
"pop_slow=%zu pop=%zu",
get(pop_slow), get(pop));
assert(get(steal_empty) <= get(steal_attempt),
"steal_empty=%zu steal_attempt=%zu",
get(steal_empty), get(steal_attempt));
assert(get(steal_contended) <= get(steal_attempt),
"steal_contended=%zu steal_attempt=%zu",
get(steal_contended), get(steal_attempt));
assert(get(steal_success) <= get(steal_attempt),
"steal_success=%zu steal_attempt=%zu",
get(steal_success), get(steal_attempt));
assert(get(steal_empty) + get(steal_contended) + get(steal_success) == get(steal_attempt),
"steal_empty=%zu steal_contended=%zu steal_success=%zu steal_attempt=%zu",
get(steal_empty), get(steal_contended), get(steal_success), get(steal_attempt));
assert(get(overflow) == 0 || get(push) != 0,
"overflow=%zu push=%zu",
get(overflow), get(push));
assert(get(overflow_max_len) == 0 || get(overflow) != 0,
"overflow_max_len=%zu overflow=%zu",
get(overflow_max_len), get(overflow));
}
#endif // ASSERT
#endif // TASKQUEUE_STATS
#ifdef ASSERT
bool ObjArrayTask::is_valid() const {
return _obj != NULL && _obj->is_objArray() && _index >= 0 &&
_index < objArrayOop(_obj)->length();
}
#endif // ASSERT
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