1 /*
   2  * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "runtime/arguments.hpp"
  27 #include "runtime/flags/jvmFlag.hpp"
  28 #include "runtime/flags/jvmFlagConstraintsRuntime.hpp"
  29 #include "runtime/flags/jvmFlagRangeList.hpp"
  30 #include "runtime/globals.hpp"
  31 #include "runtime/safepointMechanism.hpp"
  32 #include "runtime/task.hpp"
  33 #include "utilities/defaultStream.hpp"
  34 
  35 JVMFlag::Error ObjectAlignmentInBytesConstraintFunc(intx value, bool verbose) {
  36   if (!is_power_of_2(value)) {
  37     CommandLineError::print(verbose,
  38                             "ObjectAlignmentInBytes (" INTX_FORMAT ") must be "
  39                             "power of 2\n",
  40                             value);
  41     return JVMFlag::VIOLATES_CONSTRAINT;
  42   }
  43   // In case page size is very small.
  44   if (value >= (intx)os::vm_page_size()) {
  45     CommandLineError::print(verbose,
  46                             "ObjectAlignmentInBytes (" INTX_FORMAT ") must be "
  47                             "less than page size (" INTX_FORMAT ")\n",
  48                             value, (intx)os::vm_page_size());
  49     return JVMFlag::VIOLATES_CONSTRAINT;
  50   }
  51   return JVMFlag::SUCCESS;
  52 }
  53 
  54 // Need to enforce the padding not to break the existing field alignments.
  55 // It is sufficient to check against the largest type size.
  56 JVMFlag::Error ContendedPaddingWidthConstraintFunc(intx value, bool verbose) {
  57   if ((value % BytesPerLong) != 0) {
  58     CommandLineError::print(verbose,
  59                             "ContendedPaddingWidth (" INTX_FORMAT ") must be "
  60                             "a multiple of %d\n",
  61                             value, BytesPerLong);
  62     return JVMFlag::VIOLATES_CONSTRAINT;
  63   } else {
  64     return JVMFlag::SUCCESS;
  65   }
  66 }
  67 
  68 JVMFlag::Error BiasedLockingBulkRebiasThresholdFunc(intx value, bool verbose) {
  69   if (value > BiasedLockingBulkRevokeThreshold) {
  70     CommandLineError::print(verbose,
  71                             "BiasedLockingBulkRebiasThreshold (" INTX_FORMAT ") must be "
  72                             "less than or equal to BiasedLockingBulkRevokeThreshold (" INTX_FORMAT ")\n",
  73                             value, BiasedLockingBulkRevokeThreshold);
  74     return JVMFlag::VIOLATES_CONSTRAINT;
  75   } else {
  76     return JVMFlag::SUCCESS;
  77   }
  78 }
  79 
  80 JVMFlag::Error BiasedLockingStartupDelayFunc(intx value, bool verbose) {
  81   if ((value % PeriodicTask::interval_gran) != 0) {
  82     CommandLineError::print(verbose,
  83                             "BiasedLockingStartupDelay (" INTX_FORMAT ") must be "
  84                             "evenly divisible by PeriodicTask::interval_gran (" INTX_FORMAT ")\n",
  85                             value, PeriodicTask::interval_gran);
  86     return JVMFlag::VIOLATES_CONSTRAINT;
  87   } else {
  88     return JVMFlag::SUCCESS;
  89   }
  90 }
  91 
  92 JVMFlag::Error BiasedLockingBulkRevokeThresholdFunc(intx value, bool verbose) {
  93   if (value < BiasedLockingBulkRebiasThreshold) {
  94     CommandLineError::print(verbose,
  95                             "BiasedLockingBulkRevokeThreshold (" INTX_FORMAT ") must be "
  96                             "greater than or equal to BiasedLockingBulkRebiasThreshold (" INTX_FORMAT ")\n",
  97                             value, BiasedLockingBulkRebiasThreshold);
  98     return JVMFlag::VIOLATES_CONSTRAINT;
  99   } else if ((double)value/(double)BiasedLockingDecayTime > 0.1) {
 100     CommandLineError::print(verbose,
 101                             "The ratio of BiasedLockingBulkRevokeThreshold (" INTX_FORMAT ")"
 102                             " to BiasedLockingDecayTime (" INTX_FORMAT ") must be "
 103                             "less than or equal to 0.1\n",
 104                             value, BiasedLockingBulkRebiasThreshold);
 105     return JVMFlag::VIOLATES_CONSTRAINT;
 106   } else {
 107     return JVMFlag::SUCCESS;
 108   }
 109 }
 110 
 111 JVMFlag::Error BiasedLockingDecayTimeFunc(intx value, bool verbose) {
 112   if (BiasedLockingBulkRebiasThreshold/(double)value > 0.1) {
 113     CommandLineError::print(verbose,
 114                             "The ratio of BiasedLockingBulkRebiasThreshold (" INTX_FORMAT ")"
 115                             " to BiasedLockingDecayTime (" INTX_FORMAT ") must be "
 116                             "less than or equal to 0.1\n",
 117                             BiasedLockingBulkRebiasThreshold, value);
 118     return JVMFlag::VIOLATES_CONSTRAINT;
 119   } else {
 120     return JVMFlag::SUCCESS;
 121   }
 122 }
 123 
 124 JVMFlag::Error PerfDataSamplingIntervalFunc(intx value, bool verbose) {
 125   if ((value % PeriodicTask::interval_gran != 0)) {
 126     CommandLineError::print(verbose,
 127                             "PerfDataSamplingInterval (" INTX_FORMAT ") must be "
 128                             "evenly divisible by PeriodicTask::interval_gran (" INTX_FORMAT ")\n",
 129                             value, PeriodicTask::interval_gran);
 130     return JVMFlag::VIOLATES_CONSTRAINT;
 131   } else {
 132     return JVMFlag::SUCCESS;
 133   }
 134 }
 135 
 136 JVMFlag::Error ThreadLocalHandshakesConstraintFunc(bool value, bool verbose) {
 137   if (value) {
 138     if (!SafepointMechanism::supports_thread_local_poll()) {
 139       CommandLineError::print(verbose, "ThreadLocalHandshakes not yet supported on this platform\n");
 140       return JVMFlag::VIOLATES_CONSTRAINT;
 141     }
 142   }
 143   return JVMFlag::SUCCESS;
 144 }

   1 /*
   2  * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "runtime/arguments.hpp"
  27 #include "runtime/flags/jvmFlag.hpp"
  28 #include "runtime/flags/jvmFlagConstraintsRuntime.hpp"

  29 #include "runtime/globals.hpp"
  30 #include "runtime/safepointMechanism.hpp"
  31 #include "runtime/task.hpp"

  32 
  33 JVMFlag::Error ObjectAlignmentInBytesConstraintFunc(intx value, bool verbose) {
  34   if (!is_power_of_2(value)) {
  35     JVMFlag::printError(verbose,
  36                         "ObjectAlignmentInBytes (" INTX_FORMAT ") must be "
  37                         "power of 2\n",
  38                         value);
  39     return JVMFlag::VIOLATES_CONSTRAINT;
  40   }
  41   // In case page size is very small.
  42   if (value >= (intx)os::vm_page_size()) {
  43     JVMFlag::printError(verbose,
  44                         "ObjectAlignmentInBytes (" INTX_FORMAT ") must be "
  45                         "less than page size (" INTX_FORMAT ")\n",
  46                         value, (intx)os::vm_page_size());
  47     return JVMFlag::VIOLATES_CONSTRAINT;
  48   }
  49   return JVMFlag::SUCCESS;
  50 }
  51 
  52 // Need to enforce the padding not to break the existing field alignments.
  53 // It is sufficient to check against the largest type size.
  54 JVMFlag::Error ContendedPaddingWidthConstraintFunc(intx value, bool verbose) {
  55   if ((value % BytesPerLong) != 0) {
  56     JVMFlag::printError(verbose,
  57                         "ContendedPaddingWidth (" INTX_FORMAT ") must be "
  58                         "a multiple of %d\n",
  59                         value, BytesPerLong);
  60     return JVMFlag::VIOLATES_CONSTRAINT;
  61   } else {
  62     return JVMFlag::SUCCESS;
  63   }
  64 }
  65 
  66 JVMFlag::Error BiasedLockingBulkRebiasThresholdFunc(intx value, bool verbose) {
  67   if (value > BiasedLockingBulkRevokeThreshold) {
  68     JVMFlag::printError(verbose,
  69                         "BiasedLockingBulkRebiasThreshold (" INTX_FORMAT ") must be "
  70                         "less than or equal to BiasedLockingBulkRevokeThreshold (" INTX_FORMAT ")\n",
  71                         value, BiasedLockingBulkRevokeThreshold);
  72     return JVMFlag::VIOLATES_CONSTRAINT;
  73   } else {
  74     return JVMFlag::SUCCESS;
  75   }
  76 }
  77 
  78 JVMFlag::Error BiasedLockingStartupDelayFunc(intx value, bool verbose) {
  79   if ((value % PeriodicTask::interval_gran) != 0) {
  80     JVMFlag::printError(verbose,
  81                         "BiasedLockingStartupDelay (" INTX_FORMAT ") must be "
  82                         "evenly divisible by PeriodicTask::interval_gran (" INTX_FORMAT ")\n",
  83                         value, PeriodicTask::interval_gran);
  84     return JVMFlag::VIOLATES_CONSTRAINT;
  85   } else {
  86     return JVMFlag::SUCCESS;
  87   }
  88 }
  89 
  90 JVMFlag::Error BiasedLockingBulkRevokeThresholdFunc(intx value, bool verbose) {
  91   if (value < BiasedLockingBulkRebiasThreshold) {
  92     JVMFlag::printError(verbose,
  93                         "BiasedLockingBulkRevokeThreshold (" INTX_FORMAT ") must be "
  94                         "greater than or equal to BiasedLockingBulkRebiasThreshold (" INTX_FORMAT ")\n",
  95                         value, BiasedLockingBulkRebiasThreshold);
  96     return JVMFlag::VIOLATES_CONSTRAINT;
  97   } else if ((double)value/(double)BiasedLockingDecayTime > 0.1) {
  98     JVMFlag::printError(verbose,
  99                         "The ratio of BiasedLockingBulkRevokeThreshold (" INTX_FORMAT ")"
 100                         " to BiasedLockingDecayTime (" INTX_FORMAT ") must be "
 101                         "less than or equal to 0.1\n",
 102                         value, BiasedLockingBulkRebiasThreshold);
 103     return JVMFlag::VIOLATES_CONSTRAINT;
 104   } else {
 105     return JVMFlag::SUCCESS;
 106   }
 107 }
 108 
 109 JVMFlag::Error BiasedLockingDecayTimeFunc(intx value, bool verbose) {
 110   if (BiasedLockingBulkRebiasThreshold/(double)value > 0.1) {
 111     JVMFlag::printError(verbose,
 112                         "The ratio of BiasedLockingBulkRebiasThreshold (" INTX_FORMAT ")"
 113                         " to BiasedLockingDecayTime (" INTX_FORMAT ") must be "
 114                         "less than or equal to 0.1\n",
 115                         BiasedLockingBulkRebiasThreshold, value);
 116     return JVMFlag::VIOLATES_CONSTRAINT;
 117   } else {
 118     return JVMFlag::SUCCESS;
 119   }
 120 }
 121 
 122 JVMFlag::Error PerfDataSamplingIntervalFunc(intx value, bool verbose) {
 123   if ((value % PeriodicTask::interval_gran != 0)) {
 124     JVMFlag::printError(verbose,
 125                         "PerfDataSamplingInterval (" INTX_FORMAT ") must be "
 126                         "evenly divisible by PeriodicTask::interval_gran (" INTX_FORMAT ")\n",
 127                         value, PeriodicTask::interval_gran);
 128     return JVMFlag::VIOLATES_CONSTRAINT;
 129   } else {
 130     return JVMFlag::SUCCESS;
 131   }
 132 }
 133 
 134 JVMFlag::Error ThreadLocalHandshakesConstraintFunc(bool value, bool verbose) {
 135   if (value) {
 136     if (!SafepointMechanism::supports_thread_local_poll()) {
 137       JVMFlag::printError(verbose, "ThreadLocalHandshakes not yet supported on this platform\n");
 138       return JVMFlag::VIOLATES_CONSTRAINT;
 139     }
 140   }
 141   return JVMFlag::SUCCESS;
 142 }