hotspot/src/share/vm/runtime/commandLineFlagConstraintsRuntime.cpp
author gziemski
Thu, 15 Oct 2015 13:34:21 -0500
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parent 32351 1da9b960b3d4
child 37212 eee5234b860e
permissions -rw-r--r--
8078556: Runtime: implement ranges (optionally constraints) for those flags that have them missing. Summary: JEP 245: implement ranges and constraints for runtime flags. Reviewed-by: coleenp, ddmitriev, jiangli, goetz Contributed-by: goetz.lindenmaier@sap.com, gerard.ziemski@oracle.com
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/*
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 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "runtime/arguments.hpp"
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#include "runtime/commandLineFlagConstraintsRuntime.hpp"
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#include "runtime/commandLineFlagRangeList.hpp"
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#include "runtime/globals.hpp"
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#include "runtime/task.hpp"
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#include "utilities/defaultStream.hpp"
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Flag::Error ObjectAlignmentInBytesConstraintFunc(intx value, bool verbose) {
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  if (!is_power_of_2(value)) {
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    CommandLineError::print(verbose,
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                            "ObjectAlignmentInBytes (" INTX_FORMAT ") must be "
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                            "power of 2\n",
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                            value);
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    return Flag::VIOLATES_CONSTRAINT;
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  }
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  // In case page size is very small.
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  if (value >= (intx)os::vm_page_size()) {
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    CommandLineError::print(verbose,
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                            "ObjectAlignmentInBytes (" INTX_FORMAT ") must be "
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                            "less than page size (" INTX_FORMAT ")\n",
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                            value, (intx)os::vm_page_size());
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    return Flag::VIOLATES_CONSTRAINT;
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  }
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  return Flag::SUCCESS;
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}
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// Need to enforce the padding not to break the existing field alignments.
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// It is sufficient to check against the largest type size.
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Flag::Error ContendedPaddingWidthConstraintFunc(intx value, bool verbose) {
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  if ((value % BytesPerLong) != 0) {
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    CommandLineError::print(verbose,
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                            "ContendedPaddingWidth (" INTX_FORMAT ") must be "
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                            "a multiple of %d\n",
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                            value, BytesPerLong);
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    return Flag::VIOLATES_CONSTRAINT;
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  } else {
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    return Flag::SUCCESS;
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  }
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}
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Flag::Error BiasedLockingBulkRebiasThresholdFunc(intx value, bool verbose) {
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  if (value > BiasedLockingBulkRevokeThreshold) {
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    CommandLineError::print(verbose,
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                            "BiasedLockingBulkRebiasThreshold (" INTX_FORMAT ") must be "
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                            "less than or equal to BiasedLockingBulkRevokeThreshold (" INTX_FORMAT ")\n",
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                            value, BiasedLockingBulkRevokeThreshold);
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    return Flag::VIOLATES_CONSTRAINT;
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  } else {
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    return Flag::SUCCESS;
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  }
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}
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Flag::Error BiasedLockingStartupDelayFunc(intx value, bool verbose) {
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  if ((value % PeriodicTask::interval_gran) != 0) {
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    CommandLineError::print(verbose,
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                            "BiasedLockingStartupDelay (" INTX_FORMAT ") must be "
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                            "evenly divisible by PeriodicTask::interval_gran (" INTX_FORMAT ")\n",
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                            value, PeriodicTask::interval_gran);
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    return Flag::VIOLATES_CONSTRAINT;
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  } else {
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    return Flag::SUCCESS;
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  }
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}
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Flag::Error BiasedLockingBulkRevokeThresholdFunc(intx value, bool verbose) {
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  if (value < BiasedLockingBulkRebiasThreshold) {
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    CommandLineError::print(verbose,
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                            "BiasedLockingBulkRevokeThreshold (" INTX_FORMAT ") must be "
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                            "greater than or equal to BiasedLockingBulkRebiasThreshold (" INTX_FORMAT ")\n",
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                            value, BiasedLockingBulkRebiasThreshold);
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    return Flag::VIOLATES_CONSTRAINT;
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  } else if ((double)value/(double)BiasedLockingDecayTime > 0.1) {
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    CommandLineError::print(verbose,
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                            "The ratio of BiasedLockingBulkRevokeThreshold (" INTX_FORMAT ")"
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                            " to BiasedLockingDecayTime (" INTX_FORMAT ") must be "
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                            "less than or equal to 0.1\n",
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                            value, BiasedLockingBulkRebiasThreshold);
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    return Flag::VIOLATES_CONSTRAINT;
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  } else {
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    return Flag::SUCCESS;
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  }
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}
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Flag::Error BiasedLockingDecayTimeFunc(intx value, bool verbose) {
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  if (BiasedLockingBulkRebiasThreshold/(double)value > 0.1) {
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    CommandLineError::print(verbose,
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                            "The ratio of BiasedLockingBulkRebiasThreshold (" INTX_FORMAT ")"
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                            " to BiasedLockingDecayTime (" INTX_FORMAT ") must be "
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                            "less than or equal to 0.1\n",
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                            BiasedLockingBulkRebiasThreshold, value);
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    return Flag::VIOLATES_CONSTRAINT;
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  } else {
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    return Flag::SUCCESS;
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  }
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}
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Flag::Error PerfDataSamplingIntervalFunc(intx value, bool verbose) {
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  if ((value % PeriodicTask::interval_gran != 0)) {
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    CommandLineError::print(verbose,
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                            "PerfDataSamplingInterval (" INTX_FORMAT ") must be "
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                            "evenly divisible by PeriodicTask::interval_gran (" INTX_FORMAT ")\n",
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                            value, PeriodicTask::interval_gran);
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    return Flag::VIOLATES_CONSTRAINT;
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  } else {
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    return Flag::SUCCESS;
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  }
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}