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/commandLineFlagConstraintsRuntime.hpp"
  28 #include "runtime/commandLineFlagRangeList.hpp"
  29 #include "runtime/globals.hpp"
  30 #include "runtime/safepointMechanism.hpp"
  31 #include "runtime/task.hpp"
  32 #include "utilities/defaultStream.hpp"
  33 
  34 Flag::Error ObjectAlignmentInBytesConstraintFunc(intx value, bool verbose) {
  35   if (!is_power_of_2(value)) {
  36     CommandLineError::print(verbose,
  37                             "ObjectAlignmentInBytes (" INTX_FORMAT ") must be "
  38                             "power of 2\n",
  39                             value);
  40     return Flag::VIOLATES_CONSTRAINT;
  41   }
  42   // In case page size is very small.
  43   if (value >= (intx)os::vm_page_size()) {
  44     CommandLineError::print(verbose,
  45                             "ObjectAlignmentInBytes (" INTX_FORMAT ") must be "
  46                             "less than page size (" INTX_FORMAT ")\n",
  47                             value, (intx)os::vm_page_size());
  48     return Flag::VIOLATES_CONSTRAINT;
  49   }
  50   return Flag::SUCCESS;
  51 }
  52 
  53 // Need to enforce the padding not to break the existing field alignments.
  54 // It is sufficient to check against the largest type size.
  55 Flag::Error ContendedPaddingWidthConstraintFunc(intx value, bool verbose) {
  56   if ((value % BytesPerLong) != 0) {
  57     CommandLineError::print(verbose,
  58                             "ContendedPaddingWidth (" INTX_FORMAT ") must be "
  59                             "a multiple of %d\n",
  60                             value, BytesPerLong);
  61     return Flag::VIOLATES_CONSTRAINT;
  62   } else {
  63     return Flag::SUCCESS;
  64   }
  65 }
  66 
  67 Flag::Error BiasedLockingBulkRebiasThresholdFunc(intx value, bool verbose) {
  68   if (value > BiasedLockingBulkRevokeThreshold) {
  69     CommandLineError::print(verbose,
  70                             "BiasedLockingBulkRebiasThreshold (" INTX_FORMAT ") must be "
  71                             "less than or equal to BiasedLockingBulkRevokeThreshold (" INTX_FORMAT ")\n",
  72                             value, BiasedLockingBulkRevokeThreshold);
  73     return Flag::VIOLATES_CONSTRAINT;
  74   } else {
  75     return Flag::SUCCESS;
  76   }
  77 }
  78 
  79 Flag::Error BiasedLockingStartupDelayFunc(intx value, bool verbose) {
  80   if ((value % PeriodicTask::interval_gran) != 0) {
  81     CommandLineError::print(verbose,
  82                             "BiasedLockingStartupDelay (" INTX_FORMAT ") must be "
  83                             "evenly divisible by PeriodicTask::interval_gran (" INTX_FORMAT ")\n",
  84                             value, PeriodicTask::interval_gran);
  85     return Flag::VIOLATES_CONSTRAINT;
  86   } else {
  87     return Flag::SUCCESS;
  88   }
  89 }
  90 
  91 Flag::Error BiasedLockingBulkRevokeThresholdFunc(intx value, bool verbose) {
  92   if (value < BiasedLockingBulkRebiasThreshold) {
  93     CommandLineError::print(verbose,
  94                             "BiasedLockingBulkRevokeThreshold (" INTX_FORMAT ") must be "
  95                             "greater than or equal to BiasedLockingBulkRebiasThreshold (" INTX_FORMAT ")\n",
  96                             value, BiasedLockingBulkRebiasThreshold);
  97     return Flag::VIOLATES_CONSTRAINT;
  98   } else if ((double)value/(double)BiasedLockingDecayTime > 0.1) {
  99     CommandLineError::print(verbose,
 100                             "The ratio of BiasedLockingBulkRevokeThreshold (" INTX_FORMAT ")"
 101                             " to BiasedLockingDecayTime (" INTX_FORMAT ") must be "
 102                             "less than or equal to 0.1\n",
 103                             value, BiasedLockingBulkRebiasThreshold);
 104     return Flag::VIOLATES_CONSTRAINT;
 105   } else {
 106     return Flag::SUCCESS;
 107   }
 108 }
 109 
 110 Flag::Error BiasedLockingDecayTimeFunc(intx value, bool verbose) {
 111   if (BiasedLockingBulkRebiasThreshold/(double)value > 0.1) {
 112     CommandLineError::print(verbose,
 113                             "The ratio of BiasedLockingBulkRebiasThreshold (" INTX_FORMAT ")"
 114                             " to BiasedLockingDecayTime (" INTX_FORMAT ") must be "
 115                             "less than or equal to 0.1\n",
 116                             BiasedLockingBulkRebiasThreshold, value);
 117     return Flag::VIOLATES_CONSTRAINT;
 118   } else {
 119     return Flag::SUCCESS;
 120   }
 121 }
 122 
 123 Flag::Error PerfDataSamplingIntervalFunc(intx value, bool verbose) {
 124   if ((value % PeriodicTask::interval_gran != 0)) {
 125     CommandLineError::print(verbose,
 126                             "PerfDataSamplingInterval (" INTX_FORMAT ") must be "
 127                             "evenly divisible by PeriodicTask::interval_gran (" INTX_FORMAT ")\n",
 128                             value, PeriodicTask::interval_gran);
 129     return Flag::VIOLATES_CONSTRAINT;
 130   } else {
 131     return Flag::SUCCESS;
 132   }
 133 }
 134 
 135 Flag::Error ThreadLocalHandshakesConstraintFunc(bool value, bool verbose) {
 136   if (value) {
 137     if (!SafepointMechanism::supports_thread_local_poll()) {
 138       CommandLineError::print(verbose, "ThreadLocalHandshakes not yet supported on this platform\n");
 139       return Flag::VIOLATES_CONSTRAINT;
 140     }
 141   }
 142   return Flag::SUCCESS;
 143 }

   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/jvmFlagConstraintsRuntime.hpp"
  28 #include "runtime/jvmFlagRangeList.hpp"

  29 #include "runtime/safepointMechanism.hpp"
  30 #include "runtime/task.hpp"
  31 #include "utilities/defaultStream.hpp"
  32 
  33 JVMFlag::Error ObjectAlignmentInBytesConstraintFunc(intx value, bool verbose) {
  34   if (!is_power_of_2(value)) {
  35     CommandLineError::print(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     CommandLineError::print(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     CommandLineError::print(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     CommandLineError::print(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     CommandLineError::print(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     CommandLineError::print(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     CommandLineError::print(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     CommandLineError::print(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     CommandLineError::print(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       CommandLineError::print(verbose, "ThreadLocalHandshakes not yet supported on this platform\n");
 138       return JVMFlag::VIOLATES_CONSTRAINT;
 139     }
 140   }
 141   return JVMFlag::SUCCESS;
 142 }