diff -r 6073de33135f -r 6d88c15e2a8f hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.cpp --- a/hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.cpp Fri Jul 18 08:25:26 2014 -0700 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,1354 +0,0 @@ -/* - * Copyright (c) 2004, 2013, 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 -#ifdef TARGET_OS_FAMILY_aix -# include "os_aix.inline.hpp" -#endif -#ifdef TARGET_OS_FAMILY_bsd -# include "os_bsd.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 accumulating 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 granularity. - // Comment it out and investigate 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_collection_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 accumulating 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_eden_space_size(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_eden_space_size: " - "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_eden_space_size 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); -} - -uint CMSAdaptiveSizePolicy::compute_survivor_space_size_and_threshold( - bool is_survivor_overflow, - uint 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 between 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: %u" - " 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* young = gch->get_gen(0); - DefNewGeneration* def_new = young->as_DefNewGeneration(); - return AdaptiveSizePolicy::print_adaptive_size_policy_on( - st, - def_new->tenuring_threshold()); -}