--- 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());
-}