jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.cpp@4947ee68d19c (annotated)

src/share/vm/gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.cpp@4947ee68d19c (annotated)

src/share/vm/gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.cpp

Thu, 06 Jan 2011 23:50:02 -0800

author: ysr
date: Thu, 06 Jan 2011 23:50:02 -0800
changeset 2452: 4947ee68d19c
parent 2314: f95d63e2154a
child 3156: f08d439fab8c
permissions: -rw-r--r--

7008136: CMS: assert((HeapWord*)nextChunk <= _limit) failed: sweep invariant
Summary: The recorded _sweep_limit may not necessarily remain a block boundary as the old generation expands during a concurrent cycle. Terminal actions inside the sweep closure need to be aware of this as they cross over the limit.
Reviewed-by: johnc, minqi

 /*
  * Copyright (c) 2004, 2010, 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_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp"
 #include "gc_implementation/shared/gcStats.hpp"
 #include "memory/defNewGeneration.hpp"
 #include "memory/genCollectedHeap.hpp"
 #include "runtime/thread.hpp"
 #ifdef TARGET_OS_FAMILY_linux
 # include "os_linux.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_solaris
 # include "os_solaris.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_windows
 # include "os_windows.inline.hpp"
 #endif
 elapsedTimer CMSAdaptiveSizePolicy::_concurrent_timer;
 elapsedTimer CMSAdaptiveSizePolicy::_STW_timer;
 // Defined if the granularity of the time measurements is potentially too large.
 #define CLOCK_GRANULARITY_TOO_LARGE
 CMSAdaptiveSizePolicy::CMSAdaptiveSizePolicy(size_t init_eden_size,
                                              size_t init_promo_size,
                                              size_t init_survivor_size,
                                              double max_gc_minor_pause_sec,
                                              double max_gc_pause_sec,
                                              uint gc_cost_ratio) :
   AdaptiveSizePolicy(init_eden_size,
                      init_promo_size,
                      init_survivor_size,
                      max_gc_pause_sec,
                      gc_cost_ratio) {
   clear_internal_time_intervals();
   _processor_count = os::active_processor_count();
   if (CMSConcurrentMTEnabled && (ConcGCThreads > 1)) {
     assert(_processor_count > 0, "Processor count is suspect");
     _concurrent_processor_count = MIN2((uint) ConcGCThreads,
                                        (uint) _processor_count);
   } else {
     _concurrent_processor_count = 1;
   }
   _avg_concurrent_time  = new AdaptiveWeightedAverage(AdaptiveTimeWeight);
   _avg_concurrent_interval = new AdaptiveWeightedAverage(AdaptiveTimeWeight);
   _avg_concurrent_gc_cost = new AdaptiveWeightedAverage(AdaptiveTimeWeight);
   _avg_initial_pause    = new AdaptivePaddedAverage(AdaptiveTimeWeight,
                                                     PausePadding);
   _avg_remark_pause     = new AdaptivePaddedAverage(AdaptiveTimeWeight,
                                                     PausePadding);
   _avg_cms_STW_time     = new AdaptiveWeightedAverage(AdaptiveTimeWeight);
   _avg_cms_STW_gc_cost  = new AdaptiveWeightedAverage(AdaptiveTimeWeight);
   _avg_cms_free         = new AdaptiveWeightedAverage(AdaptiveTimeWeight);
   _avg_cms_free_at_sweep = new AdaptiveWeightedAverage(AdaptiveTimeWeight);
   _avg_cms_promo        = new AdaptiveWeightedAverage(AdaptiveTimeWeight);
   // Mark-sweep-compact
   _avg_msc_pause        = new AdaptiveWeightedAverage(AdaptiveTimeWeight);
   _avg_msc_interval     = new AdaptiveWeightedAverage(AdaptiveTimeWeight);
   _avg_msc_gc_cost      = new AdaptiveWeightedAverage(AdaptiveTimeWeight);
   // Mark-sweep
   _avg_ms_pause = new AdaptiveWeightedAverage(AdaptiveTimeWeight);
   _avg_ms_interval      = new AdaptiveWeightedAverage(AdaptiveTimeWeight);
   _avg_ms_gc_cost       = new AdaptiveWeightedAverage(AdaptiveTimeWeight);
   // Variables that estimate pause times as a function of generation
   // size.
   _remark_pause_old_estimator =
     new LinearLeastSquareFit(AdaptiveSizePolicyWeight);
   _initial_pause_old_estimator =
     new LinearLeastSquareFit(AdaptiveSizePolicyWeight);
   _remark_pause_young_estimator =
     new LinearLeastSquareFit(AdaptiveSizePolicyWeight);
   _initial_pause_young_estimator =
     new LinearLeastSquareFit(AdaptiveSizePolicyWeight);
   // Alignment comes from that used in ReservedSpace.
   _generation_alignment = os::vm_allocation_granularity();
   // Start the concurrent timer here so that the first
   // concurrent_phases_begin() measures a finite mutator
   // time.  A finite mutator time is used to determine
   // if a concurrent collection has been started.  If this
   // proves to be a problem, use some explicit flag to
   // signal that a concurrent collection has been started.
   _concurrent_timer.start();
   _STW_timer.start();
 }
 double CMSAdaptiveSizePolicy::concurrent_processor_fraction() {
   // For now assume no other daemon threads are taking alway
   // cpu's from the application.
   return ((double) _concurrent_processor_count / (double) _processor_count);
 }
 double CMSAdaptiveSizePolicy::concurrent_collection_cost(
                                                   double interval_in_seconds) {
   //  When the precleaning and sweeping phases use multiple
   // threads, change one_processor_fraction to
   // concurrent_processor_fraction().
   double one_processor_fraction = 1.0 / ((double) processor_count());
   double concurrent_cost =
     collection_cost(_latest_cms_concurrent_marking_time_secs,
                 interval_in_seconds) * concurrent_processor_fraction() +
     collection_cost(_latest_cms_concurrent_precleaning_time_secs,
                 interval_in_seconds) * one_processor_fraction +
     collection_cost(_latest_cms_concurrent_sweeping_time_secs,
                 interval_in_seconds) * one_processor_fraction;
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->print_cr(
       "\nCMSAdaptiveSizePolicy::scaled_concurrent_collection_cost(%f) "
       "_latest_cms_concurrent_marking_cost %f "
       "_latest_cms_concurrent_precleaning_cost %f "
       "_latest_cms_concurrent_sweeping_cost %f "
       "concurrent_processor_fraction %f "
       "concurrent_cost %f ",
       interval_in_seconds,
       collection_cost(_latest_cms_concurrent_marking_time_secs,
         interval_in_seconds),
       collection_cost(_latest_cms_concurrent_precleaning_time_secs,
         interval_in_seconds),
       collection_cost(_latest_cms_concurrent_sweeping_time_secs,
         interval_in_seconds),
       concurrent_processor_fraction(),
       concurrent_cost);
   }
   return concurrent_cost;
 }
 double CMSAdaptiveSizePolicy::concurrent_collection_time() {
   double latest_cms_sum_concurrent_phases_time_secs =
     _latest_cms_concurrent_marking_time_secs +
     _latest_cms_concurrent_precleaning_time_secs +
     _latest_cms_concurrent_sweeping_time_secs;
   return latest_cms_sum_concurrent_phases_time_secs;
 }
 double CMSAdaptiveSizePolicy::scaled_concurrent_collection_time() {
   //  When the precleaning and sweeping phases use multiple
   // threads, change one_processor_fraction to
   // concurrent_processor_fraction().
   double one_processor_fraction = 1.0 / ((double) processor_count());
   double latest_cms_sum_concurrent_phases_time_secs =
     _latest_cms_concurrent_marking_time_secs * concurrent_processor_fraction() +
     _latest_cms_concurrent_precleaning_time_secs * one_processor_fraction +
     _latest_cms_concurrent_sweeping_time_secs * one_processor_fraction ;
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->print_cr(
       "\nCMSAdaptiveSizePolicy::scaled_concurrent_collection_time "
       "_latest_cms_concurrent_marking_time_secs %f "
       "_latest_cms_concurrent_precleaning_time_secs %f "
       "_latest_cms_concurrent_sweeping_time_secs %f "
       "concurrent_processor_fraction %f "
       "latest_cms_sum_concurrent_phases_time_secs %f ",
       _latest_cms_concurrent_marking_time_secs,
       _latest_cms_concurrent_precleaning_time_secs,
       _latest_cms_concurrent_sweeping_time_secs,
       concurrent_processor_fraction(),
       latest_cms_sum_concurrent_phases_time_secs);
   }
   return latest_cms_sum_concurrent_phases_time_secs;
 }
 void CMSAdaptiveSizePolicy::update_minor_pause_old_estimator(
     double minor_pause_in_ms) {
   // Get the equivalent of the free space
   // that is available for promotions in the CMS generation
   // and use that to update _minor_pause_old_estimator
   // Don't implement this until it is needed. A warning is
   // printed if _minor_pause_old_estimator is used.
 }
 void CMSAdaptiveSizePolicy::concurrent_marking_begin() {
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->print(" ");
     gclog_or_tty->stamp();
     gclog_or_tty->print(": concurrent_marking_begin ");
   }
   //  Update the interval time
   _concurrent_timer.stop();
   _latest_cms_collection_end_to_collection_start_secs = _concurrent_timer.seconds();
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::concurrent_marking_begin: "
     "mutator time %f", _latest_cms_collection_end_to_collection_start_secs);
   }
   _concurrent_timer.reset();
   _concurrent_timer.start();
 }
 void CMSAdaptiveSizePolicy::concurrent_marking_end() {
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->stamp();
     gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::concurrent_marking_end()");
   }
   _concurrent_timer.stop();
   _latest_cms_concurrent_marking_time_secs = _concurrent_timer.seconds();
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->print_cr("\n CMSAdaptiveSizePolicy::concurrent_marking_end"
       ":concurrent marking time (s) %f",
       _latest_cms_concurrent_marking_time_secs);
   }
 }
 void CMSAdaptiveSizePolicy::concurrent_precleaning_begin() {
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->stamp();
     gclog_or_tty->print_cr(
       "CMSAdaptiveSizePolicy::concurrent_precleaning_begin()");
   }
   _concurrent_timer.reset();
   _concurrent_timer.start();
 }
 void CMSAdaptiveSizePolicy::concurrent_precleaning_end() {
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->stamp();
     gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::concurrent_precleaning_end()");
   }
   _concurrent_timer.stop();
   // May be set again by a second call during the same collection.
   _latest_cms_concurrent_precleaning_time_secs = _concurrent_timer.seconds();
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->print_cr("\n CMSAdaptiveSizePolicy::concurrent_precleaning_end"
       ":concurrent precleaning time (s) %f",
       _latest_cms_concurrent_precleaning_time_secs);
   }
 }
 void CMSAdaptiveSizePolicy::concurrent_sweeping_begin() {
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->stamp();
     gclog_or_tty->print_cr(
       "CMSAdaptiveSizePolicy::concurrent_sweeping_begin()");
   }
   _concurrent_timer.reset();
   _concurrent_timer.start();
 }
 void CMSAdaptiveSizePolicy::concurrent_sweeping_end() {
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->stamp();
     gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::concurrent_sweeping_end()");
   }
   _concurrent_timer.stop();
   _latest_cms_concurrent_sweeping_time_secs = _concurrent_timer.seconds();
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->print_cr("\n CMSAdaptiveSizePolicy::concurrent_sweeping_end"
       ":concurrent sweeping time (s) %f",
       _latest_cms_concurrent_sweeping_time_secs);
   }
 }
 void CMSAdaptiveSizePolicy::concurrent_phases_end(GCCause::Cause gc_cause,
                                                   size_t cur_eden,
                                                   size_t cur_promo) {
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->print(" ");
     gclog_or_tty->stamp();
     gclog_or_tty->print(": concurrent_phases_end ");
   }
   // Update the concurrent timer
   _concurrent_timer.stop();
   if (gc_cause != GCCause::_java_lang_system_gc ||
       UseAdaptiveSizePolicyWithSystemGC) {
     avg_cms_free()->sample(cur_promo);
     double latest_cms_sum_concurrent_phases_time_secs =
       concurrent_collection_time();
     _avg_concurrent_time->sample(latest_cms_sum_concurrent_phases_time_secs);
     // Cost of collection (unit-less)
     // Total interval for collection.  May not be valid.  Tests
     // below determine whether to use this.
     //
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->print_cr("\nCMSAdaptiveSizePolicy::concurrent_phases_end \n"
       "_latest_cms_reset_end_to_initial_mark_start_secs %f \n"
       "_latest_cms_initial_mark_start_to_end_time_secs %f \n"
       "_latest_cms_remark_start_to_end_time_secs %f \n"
       "_latest_cms_concurrent_marking_time_secs %f \n"
       "_latest_cms_concurrent_precleaning_time_secs %f \n"
       "_latest_cms_concurrent_sweeping_time_secs %f \n"
       "latest_cms_sum_concurrent_phases_time_secs %f \n"
       "_latest_cms_collection_end_to_collection_start_secs %f \n"
       "concurrent_processor_fraction %f",
       _latest_cms_reset_end_to_initial_mark_start_secs,
       _latest_cms_initial_mark_start_to_end_time_secs,
       _latest_cms_remark_start_to_end_time_secs,
       _latest_cms_concurrent_marking_time_secs,
       _latest_cms_concurrent_precleaning_time_secs,
       _latest_cms_concurrent_sweeping_time_secs,
       latest_cms_sum_concurrent_phases_time_secs,
       _latest_cms_collection_end_to_collection_start_secs,
       concurrent_processor_fraction());
   }
     double interval_in_seconds =
       _latest_cms_initial_mark_start_to_end_time_secs +
       _latest_cms_remark_start_to_end_time_secs +
       latest_cms_sum_concurrent_phases_time_secs +
       _latest_cms_collection_end_to_collection_start_secs;
     assert(interval_in_seconds >= 0.0,
       "Bad interval between cms collections");
     // Sample for performance counter
     avg_concurrent_interval()->sample(interval_in_seconds);
     // STW costs (initial and remark pauses)
     // Cost of collection (unit-less)
     assert(_latest_cms_initial_mark_start_to_end_time_secs >= 0.0,
       "Bad initial mark pause");
     assert(_latest_cms_remark_start_to_end_time_secs >= 0.0,
       "Bad remark pause");
     double STW_time_in_seconds =
       _latest_cms_initial_mark_start_to_end_time_secs +
       _latest_cms_remark_start_to_end_time_secs;
     double STW_collection_cost = 0.0;
     if (interval_in_seconds > 0.0) {
       // cost for the STW phases of the concurrent collection.
       STW_collection_cost = STW_time_in_seconds / interval_in_seconds;
       avg_cms_STW_gc_cost()->sample(STW_collection_cost);
     }
     if (PrintAdaptiveSizePolicy && Verbose) {
       gclog_or_tty->print("cmsAdaptiveSizePolicy::STW_collection_end: "
         "STW gc cost: %f  average: %f", STW_collection_cost,
         avg_cms_STW_gc_cost()->average());
       gclog_or_tty->print_cr("  STW pause: %f (ms) STW period %f (ms)",
         (double) STW_time_in_seconds * MILLIUNITS,
         (double) interval_in_seconds * MILLIUNITS);
     }
     double concurrent_cost = 0.0;
     if (latest_cms_sum_concurrent_phases_time_secs > 0.0) {
       concurrent_cost = concurrent_collection_cost(interval_in_seconds);
       avg_concurrent_gc_cost()->sample(concurrent_cost);
       // Average this ms cost into all the other types gc costs
       if (PrintAdaptiveSizePolicy && Verbose) {
         gclog_or_tty->print("cmsAdaptiveSizePolicy::concurrent_phases_end: "
           "concurrent gc cost: %f  average: %f",
           concurrent_cost,
           _avg_concurrent_gc_cost->average());
         gclog_or_tty->print_cr("  concurrent time: %f (ms) cms period %f (ms)"
           " processor fraction: %f",
           latest_cms_sum_concurrent_phases_time_secs * MILLIUNITS,
           interval_in_seconds * MILLIUNITS,
           concurrent_processor_fraction());
       }
     }
     double total_collection_cost = STW_collection_cost + concurrent_cost;
     avg_major_gc_cost()->sample(total_collection_cost);
     // Gather information for estimating future behavior
     double initial_pause_in_ms = _latest_cms_initial_mark_start_to_end_time_secs * MILLIUNITS;
     double remark_pause_in_ms = _latest_cms_remark_start_to_end_time_secs * MILLIUNITS;
     double cur_promo_size_in_mbytes = ((double)cur_promo)/((double)M);
     initial_pause_old_estimator()->update(cur_promo_size_in_mbytes,
       initial_pause_in_ms);
     remark_pause_old_estimator()->update(cur_promo_size_in_mbytes,
       remark_pause_in_ms);
     major_collection_estimator()->update(cur_promo_size_in_mbytes,
       total_collection_cost);
     // This estimate uses the average eden size.  It could also
     // have used the latest eden size.  Which is better?
     double cur_eden_size_in_mbytes = ((double)cur_eden)/((double) M);
     initial_pause_young_estimator()->update(cur_eden_size_in_mbytes,
       initial_pause_in_ms);
     remark_pause_young_estimator()->update(cur_eden_size_in_mbytes,
       remark_pause_in_ms);
   }
   clear_internal_time_intervals();
   set_first_after_collection();
   // The concurrent phases keeps track of it's own mutator interval
   // with this timer.  This allows the stop-the-world phase to
   // be included in the mutator time so that the stop-the-world time
   // is not double counted.  Reset and start it.
   _concurrent_timer.reset();
   _concurrent_timer.start();
   // The mutator time between STW phases does not include the
   // concurrent collection time.
   _STW_timer.reset();
   _STW_timer.start();
 }
 void CMSAdaptiveSizePolicy::checkpoint_roots_initial_begin() {
   //  Update the interval time
   _STW_timer.stop();
   _latest_cms_reset_end_to_initial_mark_start_secs = _STW_timer.seconds();
   // Reset for the initial mark
   _STW_timer.reset();
   _STW_timer.start();
 }
 void CMSAdaptiveSizePolicy::checkpoint_roots_initial_end(
     GCCause::Cause gc_cause) {
   _STW_timer.stop();
   if (gc_cause != GCCause::_java_lang_system_gc ||
       UseAdaptiveSizePolicyWithSystemGC) {
     _latest_cms_initial_mark_start_to_end_time_secs = _STW_timer.seconds();
     avg_initial_pause()->sample(_latest_cms_initial_mark_start_to_end_time_secs);
     if (PrintAdaptiveSizePolicy && Verbose) {
       gclog_or_tty->print(
         "cmsAdaptiveSizePolicy::checkpoint_roots_initial_end: "
         "initial pause: %f ", _latest_cms_initial_mark_start_to_end_time_secs);
     }
   }
   _STW_timer.reset();
   _STW_timer.start();
 }
 void CMSAdaptiveSizePolicy::checkpoint_roots_final_begin() {
   _STW_timer.stop();
   _latest_cms_initial_mark_end_to_remark_start_secs = _STW_timer.seconds();
   // Start accumumlating time for the remark in the STW timer.
   _STW_timer.reset();
   _STW_timer.start();
 }
 void CMSAdaptiveSizePolicy::checkpoint_roots_final_end(
     GCCause::Cause gc_cause) {
   _STW_timer.stop();
   if (gc_cause != GCCause::_java_lang_system_gc ||
       UseAdaptiveSizePolicyWithSystemGC) {
     // Total initial mark pause + remark pause.
     _latest_cms_remark_start_to_end_time_secs = _STW_timer.seconds();
     double STW_time_in_seconds = _latest_cms_initial_mark_start_to_end_time_secs +
       _latest_cms_remark_start_to_end_time_secs;
     double STW_time_in_ms = STW_time_in_seconds * MILLIUNITS;
     avg_remark_pause()->sample(_latest_cms_remark_start_to_end_time_secs);
     // Sample total for initial mark + remark
     avg_cms_STW_time()->sample(STW_time_in_seconds);
     if (PrintAdaptiveSizePolicy && Verbose) {
       gclog_or_tty->print("cmsAdaptiveSizePolicy::checkpoint_roots_final_end: "
         "remark pause: %f", _latest_cms_remark_start_to_end_time_secs);
     }
   }
   // Don't start the STW times here because the concurrent
   // sweep and reset has not happened.
   //  Keep the old comment above in case I don't understand
   // what is going on but now
   // Start the STW timer because it is used by ms_collection_begin()
   // and ms_collection_end() to get the sweep time if a MS is being
   // done in the foreground.
   _STW_timer.reset();
   _STW_timer.start();
 }
 void CMSAdaptiveSizePolicy::msc_collection_begin() {
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->print(" ");
     gclog_or_tty->stamp();
     gclog_or_tty->print(": msc_collection_begin ");
   }
   _STW_timer.stop();
   _latest_cms_msc_end_to_msc_start_time_secs = _STW_timer.seconds();
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::msc_collection_begin: "
       "mutator time %f",
       _latest_cms_msc_end_to_msc_start_time_secs);
   }
   avg_msc_interval()->sample(_latest_cms_msc_end_to_msc_start_time_secs);
   _STW_timer.reset();
   _STW_timer.start();
 }
 void CMSAdaptiveSizePolicy::msc_collection_end(GCCause::Cause gc_cause) {
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->print(" ");
     gclog_or_tty->stamp();
     gclog_or_tty->print(": msc_collection_end ");
   }
   _STW_timer.stop();
   if (gc_cause != GCCause::_java_lang_system_gc ||
         UseAdaptiveSizePolicyWithSystemGC) {
     double msc_pause_in_seconds = _STW_timer.seconds();
     if ((_latest_cms_msc_end_to_msc_start_time_secs > 0.0) &&
         (msc_pause_in_seconds > 0.0)) {
       avg_msc_pause()->sample(msc_pause_in_seconds);
       double mutator_time_in_seconds = 0.0;
       if (_latest_cms_collection_end_to_collection_start_secs == 0.0) {
         // This assertion may fail because of time stamp gradularity.
         // Comment it out and investiage it at a later time.  The large
         // time stamp granularity occurs on some older linux systems.
 #ifndef CLOCK_GRANULARITY_TOO_LARGE
         assert((_latest_cms_concurrent_marking_time_secs == 0.0) &&
                (_latest_cms_concurrent_precleaning_time_secs == 0.0) &&
                (_latest_cms_concurrent_sweeping_time_secs == 0.0),
           "There should not be any concurrent time");
 #endif
         // A concurrent collection did not start.  Mutator time
         // between collections comes from the STW MSC timer.
         mutator_time_in_seconds = _latest_cms_msc_end_to_msc_start_time_secs;
       } else {
         // The concurrent collection did start so count the mutator
         // time to the start of the concurrent collection.  In this
         // case the _latest_cms_msc_end_to_msc_start_time_secs measures
         // the time between the initial mark or remark and the
         // start of the MSC.  That has no real meaning.
         mutator_time_in_seconds = _latest_cms_collection_end_to_collection_start_secs;
       }
       double latest_cms_sum_concurrent_phases_time_secs =
         concurrent_collection_time();
       double interval_in_seconds =
         mutator_time_in_seconds +
         _latest_cms_initial_mark_start_to_end_time_secs +
         _latest_cms_remark_start_to_end_time_secs +
         latest_cms_sum_concurrent_phases_time_secs +
         msc_pause_in_seconds;
       if (PrintAdaptiveSizePolicy && Verbose) {
         gclog_or_tty->print_cr("  interval_in_seconds %f \n"
           "     mutator_time_in_seconds %f \n"
           "     _latest_cms_initial_mark_start_to_end_time_secs %f\n"
           "     _latest_cms_remark_start_to_end_time_secs %f\n"
           "     latest_cms_sum_concurrent_phases_time_secs %f\n"
           "     msc_pause_in_seconds %f\n",
           interval_in_seconds,
           mutator_time_in_seconds,
           _latest_cms_initial_mark_start_to_end_time_secs,
           _latest_cms_remark_start_to_end_time_secs,
           latest_cms_sum_concurrent_phases_time_secs,
           msc_pause_in_seconds);
       }
       // The concurrent cost is wasted cost but it should be
       // included.
       double concurrent_cost = concurrent_collection_cost(interval_in_seconds);
       // Initial mark and remark, also wasted.
       double STW_time_in_seconds = _latest_cms_initial_mark_start_to_end_time_secs +
         _latest_cms_remark_start_to_end_time_secs;
       double STW_collection_cost =
         collection_cost(STW_time_in_seconds, interval_in_seconds) +
         concurrent_cost;
       if (PrintAdaptiveSizePolicy && Verbose) {
         gclog_or_tty->print_cr(" msc_collection_end:\n"
           "_latest_cms_collection_end_to_collection_start_secs %f\n"
           "_latest_cms_msc_end_to_msc_start_time_secs %f\n"
           "_latest_cms_initial_mark_start_to_end_time_secs %f\n"
           "_latest_cms_remark_start_to_end_time_secs %f\n"
           "latest_cms_sum_concurrent_phases_time_secs %f\n",
           _latest_cms_collection_end_to_collection_start_secs,
           _latest_cms_msc_end_to_msc_start_time_secs,
           _latest_cms_initial_mark_start_to_end_time_secs,
           _latest_cms_remark_start_to_end_time_secs,
           latest_cms_sum_concurrent_phases_time_secs);
         gclog_or_tty->print_cr(" msc_collection_end: \n"
           "latest_cms_sum_concurrent_phases_time_secs %f\n"
           "STW_time_in_seconds %f\n"
           "msc_pause_in_seconds %f\n",
           latest_cms_sum_concurrent_phases_time_secs,
           STW_time_in_seconds,
           msc_pause_in_seconds);
       }
       double cost = concurrent_cost + STW_collection_cost +
         collection_cost(msc_pause_in_seconds, interval_in_seconds);
       _avg_msc_gc_cost->sample(cost);
       // Average this ms cost into all the other types gc costs
       avg_major_gc_cost()->sample(cost);
       // Sample for performance counter
       _avg_msc_interval->sample(interval_in_seconds);
       if (PrintAdaptiveSizePolicy && Verbose) {
         gclog_or_tty->print("cmsAdaptiveSizePolicy::msc_collection_end: "
           "MSC gc cost: %f  average: %f", cost,
           _avg_msc_gc_cost->average());
         double msc_pause_in_ms = msc_pause_in_seconds * MILLIUNITS;
         gclog_or_tty->print_cr("  MSC pause: %f (ms) MSC period %f (ms)",
           msc_pause_in_ms, (double) interval_in_seconds * MILLIUNITS);
       }
     }
   }
   clear_internal_time_intervals();
   // Can this call be put into the epilogue?
   set_first_after_collection();
   // The concurrent phases keeps track of it's own mutator interval
   // with this timer.  This allows the stop-the-world phase to
   // be included in the mutator time so that the stop-the-world time
   // is not double counted.  Reset and start it.
   _concurrent_timer.stop();
   _concurrent_timer.reset();
   _concurrent_timer.start();
   _STW_timer.reset();
   _STW_timer.start();
 }
 void CMSAdaptiveSizePolicy::ms_collection_begin() {
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->print(" ");
     gclog_or_tty->stamp();
     gclog_or_tty->print(": ms_collection_begin ");
   }
   _STW_timer.stop();
   _latest_cms_ms_end_to_ms_start = _STW_timer.seconds();
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::ms_collection_begin: "
       "mutator time %f",
       _latest_cms_ms_end_to_ms_start);
   }
   avg_ms_interval()->sample(_STW_timer.seconds());
   _STW_timer.reset();
   _STW_timer.start();
 }
 void CMSAdaptiveSizePolicy::ms_collection_end(GCCause::Cause gc_cause) {
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->print(" ");
     gclog_or_tty->stamp();
     gclog_or_tty->print(": ms_collection_end ");
   }
   _STW_timer.stop();
   if (gc_cause != GCCause::_java_lang_system_gc ||
         UseAdaptiveSizePolicyWithSystemGC) {
     // The MS collection is a foreground collection that does all
     // the parts of a mostly concurrent collection.
     //
     // For this collection include the cost of the
     //  initial mark
     //  remark
     //  all concurrent time (scaled down by the
     //    concurrent_processor_fraction).  Some
     //    may be zero if the baton was passed before
     //    it was reached.
     //    concurrent marking
     //    sweeping
     //    resetting
     //  STW after baton was passed (STW_in_foreground_in_seconds)
     double STW_in_foreground_in_seconds = _STW_timer.seconds();
     double latest_cms_sum_concurrent_phases_time_secs =
       concurrent_collection_time();
     if (PrintAdaptiveSizePolicy && Verbose) {
       gclog_or_tty->print_cr("\nCMSAdaptiveSizePolicy::ms_collecton_end "
         "STW_in_foreground_in_seconds %f "
         "_latest_cms_initial_mark_start_to_end_time_secs %f "
         "_latest_cms_remark_start_to_end_time_secs %f "
         "latest_cms_sum_concurrent_phases_time_secs %f "
         "_latest_cms_ms_marking_start_to_end_time_secs %f "
         "_latest_cms_ms_end_to_ms_start %f",
         STW_in_foreground_in_seconds,
         _latest_cms_initial_mark_start_to_end_time_secs,
         _latest_cms_remark_start_to_end_time_secs,
         latest_cms_sum_concurrent_phases_time_secs,
         _latest_cms_ms_marking_start_to_end_time_secs,
         _latest_cms_ms_end_to_ms_start);
     }
     double STW_marking_in_seconds = _latest_cms_initial_mark_start_to_end_time_secs +
       _latest_cms_remark_start_to_end_time_secs;
 #ifndef CLOCK_GRANULARITY_TOO_LARGE
     assert(_latest_cms_ms_marking_start_to_end_time_secs == 0.0 ||
            latest_cms_sum_concurrent_phases_time_secs == 0.0,
            "marking done twice?");
 #endif
     double ms_time_in_seconds = STW_marking_in_seconds +
       STW_in_foreground_in_seconds +
       _latest_cms_ms_marking_start_to_end_time_secs +
       scaled_concurrent_collection_time();
     avg_ms_pause()->sample(ms_time_in_seconds);
     // Use the STW costs from the initial mark and remark plus
     // the cost of the concurrent phase to calculate a
     // collection cost.
     double cost = 0.0;
     if ((_latest_cms_ms_end_to_ms_start > 0.0) &&
         (ms_time_in_seconds > 0.0)) {
       double interval_in_seconds =
         _latest_cms_ms_end_to_ms_start + ms_time_in_seconds;
       if (PrintAdaptiveSizePolicy && Verbose) {
         gclog_or_tty->print_cr("\n ms_time_in_seconds  %f  "
           "latest_cms_sum_concurrent_phases_time_secs %f  "
           "interval_in_seconds %f",
           ms_time_in_seconds,
           latest_cms_sum_concurrent_phases_time_secs,
           interval_in_seconds);
       }
       cost = collection_cost(ms_time_in_seconds, interval_in_seconds);
       _avg_ms_gc_cost->sample(cost);
       // Average this ms cost into all the other types gc costs
       avg_major_gc_cost()->sample(cost);
       // Sample for performance counter
       _avg_ms_interval->sample(interval_in_seconds);
     }
     if (PrintAdaptiveSizePolicy && Verbose) {
       gclog_or_tty->print("cmsAdaptiveSizePolicy::ms_collection_end: "
         "MS gc cost: %f  average: %f", cost, _avg_ms_gc_cost->average());
       double ms_time_in_ms = ms_time_in_seconds * MILLIUNITS;
       gclog_or_tty->print_cr("  MS pause: %f (ms) MS period %f (ms)",
         ms_time_in_ms,
         _latest_cms_ms_end_to_ms_start * MILLIUNITS);
     }
   }
   // Consider putting this code (here to end) into a
   // method for convenience.
   clear_internal_time_intervals();
   set_first_after_collection();
   // The concurrent phases keeps track of it's own mutator interval
   // with this timer.  This allows the stop-the-world phase to
   // be included in the mutator time so that the stop-the-world time
   // is not double counted.  Reset and start it.
   _concurrent_timer.stop();
   _concurrent_timer.reset();
   _concurrent_timer.start();
   _STW_timer.reset();
   _STW_timer.start();
 }
 void CMSAdaptiveSizePolicy::clear_internal_time_intervals() {
   _latest_cms_reset_end_to_initial_mark_start_secs = 0.0;
   _latest_cms_initial_mark_end_to_remark_start_secs = 0.0;
   _latest_cms_collection_end_to_collection_start_secs = 0.0;
   _latest_cms_concurrent_marking_time_secs = 0.0;
   _latest_cms_concurrent_precleaning_time_secs = 0.0;
   _latest_cms_concurrent_sweeping_time_secs = 0.0;
   _latest_cms_msc_end_to_msc_start_time_secs = 0.0;
   _latest_cms_ms_end_to_ms_start = 0.0;
   _latest_cms_remark_start_to_end_time_secs = 0.0;
   _latest_cms_initial_mark_start_to_end_time_secs = 0.0;
   _latest_cms_ms_marking_start_to_end_time_secs = 0.0;
 }
 void CMSAdaptiveSizePolicy::clear_generation_free_space_flags() {
   AdaptiveSizePolicy::clear_generation_free_space_flags();
   set_change_young_gen_for_maj_pauses(0);
 }
 void CMSAdaptiveSizePolicy::concurrent_phases_resume() {
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->stamp();
     gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::concurrent_phases_resume()");
   }
   _concurrent_timer.start();
 }
 double CMSAdaptiveSizePolicy::time_since_major_gc() const {
   _concurrent_timer.stop();
   double time_since_cms_gc = _concurrent_timer.seconds();
   _concurrent_timer.start();
   _STW_timer.stop();
   double time_since_STW_gc = _STW_timer.seconds();
   _STW_timer.start();
   return MIN2(time_since_cms_gc, time_since_STW_gc);
 }
 double CMSAdaptiveSizePolicy::major_gc_interval_average_for_decay() const {
   double cms_interval = _avg_concurrent_interval->average();
   double msc_interval = _avg_msc_interval->average();
   double ms_interval = _avg_ms_interval->average();
   return MAX3(cms_interval, msc_interval, ms_interval);
 }
 double CMSAdaptiveSizePolicy::cms_gc_cost() const {
   return avg_major_gc_cost()->average();
 }
 void CMSAdaptiveSizePolicy::ms_collection_marking_begin() {
   _STW_timer.stop();
   // Start accumumlating time for the marking in the STW timer.
   _STW_timer.reset();
   _STW_timer.start();
 }
 void CMSAdaptiveSizePolicy::ms_collection_marking_end(
     GCCause::Cause gc_cause) {
   _STW_timer.stop();
   if (gc_cause != GCCause::_java_lang_system_gc ||
       UseAdaptiveSizePolicyWithSystemGC) {
     _latest_cms_ms_marking_start_to_end_time_secs = _STW_timer.seconds();
     if (PrintAdaptiveSizePolicy && Verbose) {
       gclog_or_tty->print_cr("CMSAdaptiveSizePolicy::"
         "msc_collection_marking_end: mutator time %f",
         _latest_cms_ms_marking_start_to_end_time_secs);
     }
   }
   _STW_timer.reset();
   _STW_timer.start();
 }
 double CMSAdaptiveSizePolicy::gc_cost() const {
   double cms_gen_cost = cms_gc_cost();
   double result =  MIN2(1.0, minor_gc_cost() + cms_gen_cost);
   assert(result >= 0.0, "Both minor and major costs are non-negative");
   return result;
 }
 // Cost of collection (unit-less)
 double CMSAdaptiveSizePolicy::collection_cost(double pause_in_seconds,
                                               double interval_in_seconds) {
   // Cost of collection (unit-less)
   double cost = 0.0;
   if ((interval_in_seconds > 0.0) &&
       (pause_in_seconds > 0.0)) {
     cost =
       pause_in_seconds / interval_in_seconds;
   }
   return cost;
 }
 size_t CMSAdaptiveSizePolicy::adjust_eden_for_pause_time(size_t cur_eden) {
   size_t change = 0;
   size_t desired_eden = cur_eden;
   // reduce eden size
   change = eden_decrement_aligned_down(cur_eden);
   desired_eden = cur_eden - change;
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->print_cr(
       "CMSAdaptiveSizePolicy::adjust_eden_for_pause_time "
       "adjusting eden for pause time. "
       " starting eden size " SIZE_FORMAT
       " reduced eden size " SIZE_FORMAT
       " eden delta " SIZE_FORMAT,
       cur_eden, desired_eden, change);
   }
   return desired_eden;
 }
 size_t CMSAdaptiveSizePolicy::adjust_eden_for_throughput(size_t cur_eden) {
   size_t desired_eden = cur_eden;
   set_change_young_gen_for_throughput(increase_young_gen_for_througput_true);
   size_t change = eden_increment_aligned_up(cur_eden);
   size_t scaled_change = scale_by_gen_gc_cost(change, minor_gc_cost());
   if (cur_eden + scaled_change > cur_eden) {
     desired_eden = cur_eden + scaled_change;
   }
   _young_gen_change_for_minor_throughput++;
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->print_cr(
       "CMSAdaptiveSizePolicy::adjust_eden_for_throughput "
       "adjusting eden for throughput. "
       " starting eden size " SIZE_FORMAT
       " increased eden size " SIZE_FORMAT
       " eden delta " SIZE_FORMAT,
       cur_eden, desired_eden, scaled_change);
   }
   return desired_eden;
 }
 size_t CMSAdaptiveSizePolicy::adjust_eden_for_footprint(size_t cur_eden) {
   set_decrease_for_footprint(decrease_young_gen_for_footprint_true);
   size_t change = eden_decrement(cur_eden);
   size_t desired_eden_size = cur_eden - change;
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->print_cr(
       "CMSAdaptiveSizePolicy::adjust_eden_for_footprint "
       "adjusting eden for footprint. "
       " starting eden size " SIZE_FORMAT
       " reduced eden size " SIZE_FORMAT
       " eden delta " SIZE_FORMAT,
       cur_eden, desired_eden_size, change);
   }
   return desired_eden_size;
 }
 // The eden and promo versions should be combined if possible.
 // They are the same except that the sizes of the decrement
 // and increment are different for eden and promo.
 size_t CMSAdaptiveSizePolicy::eden_decrement_aligned_down(size_t cur_eden) {
   size_t delta = eden_decrement(cur_eden);
   return align_size_down(delta, generation_alignment());
 }
 size_t CMSAdaptiveSizePolicy::eden_increment_aligned_up(size_t cur_eden) {
   size_t delta = eden_increment(cur_eden);
   return align_size_up(delta, generation_alignment());
 }
 size_t CMSAdaptiveSizePolicy::promo_decrement_aligned_down(size_t cur_promo) {
   size_t delta = promo_decrement(cur_promo);
   return align_size_down(delta, generation_alignment());
 }
 size_t CMSAdaptiveSizePolicy::promo_increment_aligned_up(size_t cur_promo) {
   size_t delta = promo_increment(cur_promo);
   return align_size_up(delta, generation_alignment());
 }
 void CMSAdaptiveSizePolicy::compute_young_generation_free_space(size_t cur_eden,
                                           size_t max_eden_size)
 {
   size_t desired_eden_size = cur_eden;
   size_t eden_limit = max_eden_size;
   // Printout input
   if (PrintGC && PrintAdaptiveSizePolicy) {
     gclog_or_tty->print_cr(
       "CMSAdaptiveSizePolicy::compute_young_generation_free_space: "
       "cur_eden " SIZE_FORMAT,
       cur_eden);
   }
   // Used for diagnostics
   clear_generation_free_space_flags();
   if (_avg_minor_pause->padded_average() > gc_pause_goal_sec()) {
     if (minor_pause_young_estimator()->decrement_will_decrease()) {
       // If the minor pause is too long, shrink the young gen.
       set_change_young_gen_for_min_pauses(
         decrease_young_gen_for_min_pauses_true);
       desired_eden_size = adjust_eden_for_pause_time(desired_eden_size);
     }
   } else if ((avg_remark_pause()->padded_average() > gc_pause_goal_sec()) ||
              (avg_initial_pause()->padded_average() > gc_pause_goal_sec())) {
     // The remark or initial pauses are not meeting the goal.  Should
     // the generation be shrunk?
     if (get_and_clear_first_after_collection() &&
         ((avg_remark_pause()->padded_average() > gc_pause_goal_sec() &&
           remark_pause_young_estimator()->decrement_will_decrease()) ||
          (avg_initial_pause()->padded_average() > gc_pause_goal_sec() &&
           initial_pause_young_estimator()->decrement_will_decrease()))) {
        set_change_young_gen_for_maj_pauses(
          decrease_young_gen_for_maj_pauses_true);
       // If the remark or initial pause is too long and this is the
       // first young gen collection after a cms collection, shrink
       // the young gen.
       desired_eden_size = adjust_eden_for_pause_time(desired_eden_size);
     }
     // If not the first young gen collection after a cms collection,
     // don't do anything.  In this case an adjustment has already
     // been made and the results of the adjustment has not yet been
     // measured.
   } else if ((minor_gc_cost() >= 0.0) &&
              (adjusted_mutator_cost() < _throughput_goal)) {
     desired_eden_size = adjust_eden_for_throughput(desired_eden_size);
   } else {
     desired_eden_size = adjust_eden_for_footprint(desired_eden_size);
   }
   if (PrintGC && PrintAdaptiveSizePolicy) {
     gclog_or_tty->print_cr(
       "CMSAdaptiveSizePolicy::compute_young_generation_free_space limits:"
       " desired_eden_size: " SIZE_FORMAT
       " old_eden_size: " SIZE_FORMAT,
       desired_eden_size, cur_eden);
   }
   set_eden_size(desired_eden_size);
 }
 size_t CMSAdaptiveSizePolicy::adjust_promo_for_pause_time(size_t cur_promo) {
   size_t change = 0;
   size_t desired_promo = cur_promo;
   // Move this test up to caller like the adjust_eden_for_pause_time()
   // call.
   if ((AdaptiveSizePausePolicy == 0) &&
       ((avg_remark_pause()->padded_average() > gc_pause_goal_sec()) ||
       (avg_initial_pause()->padded_average() > gc_pause_goal_sec()))) {
     set_change_old_gen_for_maj_pauses(decrease_old_gen_for_maj_pauses_true);
     change = promo_decrement_aligned_down(cur_promo);
     desired_promo = cur_promo - change;
   } else if ((AdaptiveSizePausePolicy > 0) &&
       (((avg_remark_pause()->padded_average() > gc_pause_goal_sec()) &&
        remark_pause_old_estimator()->decrement_will_decrease()) ||
       ((avg_initial_pause()->padded_average() > gc_pause_goal_sec()) &&
        initial_pause_old_estimator()->decrement_will_decrease()))) {
     set_change_old_gen_for_maj_pauses(decrease_old_gen_for_maj_pauses_true);
     change = promo_decrement_aligned_down(cur_promo);
     desired_promo = cur_promo - change;
   }
   if ((change != 0) &&PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->print_cr(
       "CMSAdaptiveSizePolicy::adjust_promo_for_pause_time "
       "adjusting promo for pause time. "
       " starting promo size " SIZE_FORMAT
       " reduced promo size " SIZE_FORMAT
       " promo delta " SIZE_FORMAT,
       cur_promo, desired_promo, change);
   }
   return desired_promo;
 }
 // Try to share this with PS.
 size_t CMSAdaptiveSizePolicy::scale_by_gen_gc_cost(size_t base_change,
                                                   double gen_gc_cost) {
   // Calculate the change to use for the tenured gen.
   size_t scaled_change = 0;
   // Can the increment to the generation be scaled?
   if (gc_cost() >= 0.0 && gen_gc_cost >= 0.0) {
     double scale_by_ratio = gen_gc_cost / gc_cost();
     scaled_change =
       (size_t) (scale_by_ratio * (double) base_change);
     if (PrintAdaptiveSizePolicy && Verbose) {
       gclog_or_tty->print_cr(
         "Scaled tenured increment: " SIZE_FORMAT " by %f down to "
           SIZE_FORMAT,
         base_change, scale_by_ratio, scaled_change);
     }
   } else if (gen_gc_cost >= 0.0) {
     // Scaling is not going to work.  If the major gc time is the
     // larger than the other GC costs, give it a full increment.
     if (gen_gc_cost >= (gc_cost() - gen_gc_cost)) {
       scaled_change = base_change;
     }
   } else {
     // Don't expect to get here but it's ok if it does
     // in the product build since the delta will be 0
     // and nothing will change.
     assert(false, "Unexpected value for gc costs");
   }
   return scaled_change;
 }
 size_t CMSAdaptiveSizePolicy::adjust_promo_for_throughput(size_t cur_promo) {
   size_t desired_promo = cur_promo;
   set_change_old_gen_for_throughput(increase_old_gen_for_throughput_true);
   size_t change = promo_increment_aligned_up(cur_promo);
   size_t scaled_change = scale_by_gen_gc_cost(change, major_gc_cost());
   if (cur_promo + scaled_change > cur_promo) {
     desired_promo = cur_promo + scaled_change;
   }
   _old_gen_change_for_major_throughput++;
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->print_cr(
       "CMSAdaptiveSizePolicy::adjust_promo_for_throughput "
       "adjusting promo for throughput. "
       " starting promo size " SIZE_FORMAT
       " increased promo size " SIZE_FORMAT
       " promo delta " SIZE_FORMAT,
       cur_promo, desired_promo, scaled_change);
   }
   return desired_promo;
 }
 size_t CMSAdaptiveSizePolicy::adjust_promo_for_footprint(size_t cur_promo,
                                                          size_t cur_eden) {
   set_decrease_for_footprint(decrease_young_gen_for_footprint_true);
   size_t change = promo_decrement(cur_promo);
   size_t desired_promo_size = cur_promo - change;
   if (PrintAdaptiveSizePolicy && Verbose) {
     gclog_or_tty->print_cr(
       "CMSAdaptiveSizePolicy::adjust_promo_for_footprint "
       "adjusting promo for footprint. "
       " starting promo size " SIZE_FORMAT
       " reduced promo size " SIZE_FORMAT
       " promo delta " SIZE_FORMAT,
       cur_promo, desired_promo_size, change);
   }
   return desired_promo_size;
 }
 void CMSAdaptiveSizePolicy::compute_tenured_generation_free_space(
                                 size_t cur_tenured_free,
                                 size_t max_tenured_available,
                                 size_t cur_eden) {
   // This can be bad if the desired value grows/shrinks without
   // any connection to the read free space
   size_t desired_promo_size = promo_size();
   size_t tenured_limit = max_tenured_available;
   // Printout input
   if (PrintGC && PrintAdaptiveSizePolicy) {
     gclog_or_tty->print_cr(
       "CMSAdaptiveSizePolicy::compute_tenured_generation_free_space: "
       "cur_tenured_free " SIZE_FORMAT
       " max_tenured_available " SIZE_FORMAT,
       cur_tenured_free, max_tenured_available);
   }
   // Used for diagnostics
   clear_generation_free_space_flags();
   set_decide_at_full_gc(decide_at_full_gc_true);
   if (avg_remark_pause()->padded_average() > gc_pause_goal_sec() ||
       avg_initial_pause()->padded_average() > gc_pause_goal_sec()) {
     desired_promo_size = adjust_promo_for_pause_time(cur_tenured_free);
   } else if (avg_minor_pause()->padded_average() > gc_pause_goal_sec()) {
     // Nothing to do since the minor collections are too large and
     // this method only deals with the cms generation.
   } else if ((cms_gc_cost() >= 0.0) &&
              (adjusted_mutator_cost() < _throughput_goal)) {
     desired_promo_size = adjust_promo_for_throughput(cur_tenured_free);
   } else {
     desired_promo_size = adjust_promo_for_footprint(cur_tenured_free,
                                                     cur_eden);
   }
   if (PrintGC && PrintAdaptiveSizePolicy) {
     gclog_or_tty->print_cr(
       "CMSAdaptiveSizePolicy::compute_tenured_generation_free_space limits:"
       " desired_promo_size: " SIZE_FORMAT
       " old_promo_size: " SIZE_FORMAT,
       desired_promo_size, cur_tenured_free);
   }
   set_promo_size(desired_promo_size);
 }
 int CMSAdaptiveSizePolicy::compute_survivor_space_size_and_threshold(
                                              bool is_survivor_overflow,
                                              int tenuring_threshold,
                                              size_t survivor_limit) {
   assert(survivor_limit >= generation_alignment(),
          "survivor_limit too small");
   assert((size_t)align_size_down(survivor_limit, generation_alignment())
          == survivor_limit, "survivor_limit not aligned");
   // Change UsePSAdaptiveSurvivorSizePolicy -> UseAdaptiveSurvivorSizePolicy?
   if (!UsePSAdaptiveSurvivorSizePolicy ||
       !young_gen_policy_is_ready()) {
     return tenuring_threshold;
   }
   // We'll decide whether to increase or decrease the tenuring
   // threshold based partly on the newly computed survivor size
   // (if we hit the maximum limit allowed, we'll always choose to
   // decrement the threshold).
   bool incr_tenuring_threshold = false;
   bool decr_tenuring_threshold = false;
   set_decrement_tenuring_threshold_for_gc_cost(false);
   set_increment_tenuring_threshold_for_gc_cost(false);
   set_decrement_tenuring_threshold_for_survivor_limit(false);
   if (!is_survivor_overflow) {
     // Keep running averages on how much survived
     // We use the tenuring threshold to equalize the cost of major
     // and minor collections.
     // ThresholdTolerance is used to indicate how sensitive the
     // tenuring threshold is to differences in cost betweent the
     // collection types.
     // Get the times of interest. This involves a little work, so
     // we cache the values here.
     const double major_cost = major_gc_cost();
     const double minor_cost = minor_gc_cost();
     if (minor_cost > major_cost * _threshold_tolerance_percent) {
       // Minor times are getting too long;  lower the threshold so
       // less survives and more is promoted.
       decr_tenuring_threshold = true;
       set_decrement_tenuring_threshold_for_gc_cost(true);
     } else if (major_cost > minor_cost * _threshold_tolerance_percent) {
       // Major times are too long, so we want less promotion.
       incr_tenuring_threshold = true;
       set_increment_tenuring_threshold_for_gc_cost(true);
     }
   } else {
     // Survivor space overflow occurred, so promoted and survived are
     // not accurate. We'll make our best guess by combining survived
     // and promoted and count them as survivors.
     //
     // We'll lower the tenuring threshold to see if we can correct
     // things. Also, set the survivor size conservatively. We're
     // trying to avoid many overflows from occurring if defnew size
     // is just too small.
     decr_tenuring_threshold = true;
   }
   // The padded average also maintains a deviation from the average;
   // we use this to see how good of an estimate we have of what survived.
   // We're trying to pad the survivor size as little as possible without
   // overflowing the survivor spaces.
   size_t target_size = align_size_up((size_t)_avg_survived->padded_average(),
                                      generation_alignment());
   target_size = MAX2(target_size, generation_alignment());
   if (target_size > survivor_limit) {
     // Target size is bigger than we can handle. Let's also reduce
     // the tenuring threshold.
     target_size = survivor_limit;
     decr_tenuring_threshold = true;
     set_decrement_tenuring_threshold_for_survivor_limit(true);
   }
   // Finally, increment or decrement the tenuring threshold, as decided above.
   // We test for decrementing first, as we might have hit the target size
   // limit.
   if (decr_tenuring_threshold && !(AlwaysTenure || NeverTenure)) {
     if (tenuring_threshold > 1) {
       tenuring_threshold--;
     }
   } else if (incr_tenuring_threshold && !(AlwaysTenure || NeverTenure)) {
     if (tenuring_threshold < MaxTenuringThreshold) {
       tenuring_threshold++;
     }
   }
   // We keep a running average of the amount promoted which is used
   // to decide when we should collect the old generation (when
   // the amount of old gen free space is less than what we expect to
   // promote).
   if (PrintAdaptiveSizePolicy) {
     // A little more detail if Verbose is on
     GenCollectedHeap* gch = GenCollectedHeap::heap();
     if (Verbose) {
       gclog_or_tty->print( "  avg_survived: %f"
                   "  avg_deviation: %f",
                   _avg_survived->average(),
                   _avg_survived->deviation());
     }
     gclog_or_tty->print( "  avg_survived_padded_avg: %f",
                 _avg_survived->padded_average());
     if (Verbose) {
       gclog_or_tty->print( "  avg_promoted_avg: %f"
                   "  avg_promoted_dev: %f",
                   gch->gc_stats(1)->avg_promoted()->average(),
                   gch->gc_stats(1)->avg_promoted()->deviation());
     }
     gclog_or_tty->print( "  avg_promoted_padded_avg: %f"
                 "  avg_pretenured_padded_avg: %f"
                 "  tenuring_thresh: %d"
                 "  target_size: " SIZE_FORMAT
                 "  survivor_limit: " SIZE_FORMAT,
                 gch->gc_stats(1)->avg_promoted()->padded_average(),
                 _avg_pretenured->padded_average(),
                 tenuring_threshold, target_size, survivor_limit);
     gclog_or_tty->cr();
   }
   set_survivor_size(target_size);
   return tenuring_threshold;
 }
 bool CMSAdaptiveSizePolicy::get_and_clear_first_after_collection() {
   bool result = _first_after_collection;
   _first_after_collection = false;
   return result;
 }
 bool CMSAdaptiveSizePolicy::print_adaptive_size_policy_on(
                                                     outputStream* st) const {
   if (!UseAdaptiveSizePolicy) return false;
   GenCollectedHeap* gch = GenCollectedHeap::heap();
   Generation* gen0 = gch->get_gen(0);
   DefNewGeneration* def_new = gen0->as_DefNewGeneration();
   return
     AdaptiveSizePolicy::print_adaptive_size_policy_on(
                                          st,
                                          def_new->tenuring_threshold());
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.cpp@4947ee68d19c (annotated)

src/share/vm/gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.cpp