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 /*

  * Copyright (c) 2013, 2014 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/g1/g1CollectedHeap.inline.hpp"

 #include "gc_implementation/g1/g1GCPhaseTimes.hpp"

 #include "gc_implementation/g1/g1Log.hpp"

 #include "gc_implementation/g1/g1StringDedup.hpp"

 // Helper class for avoiding interleaved logging

 class LineBuffer: public StackObj {

 private:

   static const int BUFFER_LEN = 1024;

   static const int INDENT_CHARS = 3;

   char _buffer[BUFFER_LEN];

   int _indent_level;

   int _cur;

   void vappend(const char* format, va_list ap) {

     int res = vsnprintf(&_buffer[_cur], BUFFER_LEN - _cur, format, ap);

     if (res != -1) {

       _cur += res;

     } else {

       DEBUG_ONLY(warning("buffer too small in LineBuffer");)

       _buffer[BUFFER_LEN -1] = 0;

       _cur = BUFFER_LEN; // vsnprintf above should not add to _buffer if we are called again

     }

   }

 public:

   explicit LineBuffer(int indent_level): _indent_level(indent_level), _cur(0) {

     for (; (_cur < BUFFER_LEN && _cur < (_indent_level * INDENT_CHARS)); _cur++) {

       _buffer[_cur] = ' ';

     }

   }

 #ifndef PRODUCT

   ~LineBuffer() {

     assert(_cur == _indent_level * INDENT_CHARS, "pending data in buffer - append_and_print_cr() not called?");

   }

 #endif

   void append(const char* format, ...) {

     va_list ap;

     va_start(ap, format);

     vappend(format, ap);

     va_end(ap);

   }

   void append_and_print_cr(const char* format, ...) {

     va_list ap;

     va_start(ap, format);

     vappend(format, ap);

     va_end(ap);

     gclog_or_tty->print_cr("%s", _buffer);

     _cur = _indent_level * INDENT_CHARS;

   }

 };

 template <class T>

 void WorkerDataArray<T>::print(int level, const char* title) {

   if (_length == 1) {

     // No need for min, max, average and sum for only one worker

     LineBuffer buf(level);

     buf.append("[%s:  ", title);

     buf.append(_print_format, _data[0]);

     buf.append_and_print_cr("]");

     return;

   }

   T min = _data[0];

   T max = _data[0];

   T sum = 0;

   LineBuffer buf(level);

   buf.append("[%s:", title);

   for (uint i = 0; i < _length; ++i) {

     T val = _data[i];

     min = MIN2(val, min);

     max = MAX2(val, max);

     sum += val;

     if (G1Log::finest()) {

       buf.append("  ");

       buf.append(_print_format, val);

     }

   }

   if (G1Log::finest()) {

     buf.append_and_print_cr("");

   }

   double avg = (double)sum / (double)_length;

   buf.append(" Min: ");

   buf.append(_print_format, min);

   buf.append(", Avg: ");

   buf.append("%.1lf", avg); // Always print average as a double

   buf.append(", Max: ");

   buf.append(_print_format, max);

   buf.append(", Diff: ");

   buf.append(_print_format, max - min);

   if (_print_sum) {

     // for things like the start and end times the sum is not

     // that relevant

     buf.append(", Sum: ");

     buf.append(_print_format, sum);

   }

   buf.append_and_print_cr("]");

 }

 #ifndef PRODUCT

 template <> const int WorkerDataArray<int>::_uninitialized = -1;

 template <> const double WorkerDataArray<double>::_uninitialized = -1.0;

 template <> const size_t WorkerDataArray<size_t>::_uninitialized = (size_t)-1;

 template <class T>

 void WorkerDataArray<T>::reset() {

   for (uint i = 0; i < _length; i++) {

     _data[i] = (T)_uninitialized;

   }

 }

 template <class T>

 void WorkerDataArray<T>::verify() {

   for (uint i = 0; i < _length; i++) {

     assert(_data[i] != _uninitialized,

         err_msg("Invalid data for worker " UINT32_FORMAT ", data: %lf, uninitialized: %lf",

             i, (double)_data[i], (double)_uninitialized));

   }

 }

 #endif

 G1GCPhaseTimes::G1GCPhaseTimes(uint max_gc_threads) :

   _max_gc_threads(max_gc_threads),

   _last_gc_worker_start_times_ms(_max_gc_threads, "%.1lf", false),

   _last_ext_root_scan_times_ms(_max_gc_threads, "%.1lf"),

   _last_satb_filtering_times_ms(_max_gc_threads, "%.1lf"),

   _last_update_rs_times_ms(_max_gc_threads, "%.1lf"),

   _last_update_rs_processed_buffers(_max_gc_threads, "%d"),

   _last_scan_rs_times_ms(_max_gc_threads, "%.1lf"),

   _last_strong_code_root_scan_times_ms(_max_gc_threads, "%.1lf"),

   _last_strong_code_root_mark_times_ms(_max_gc_threads, "%.1lf"),

   _last_obj_copy_times_ms(_max_gc_threads, "%.1lf"),

   _last_termination_times_ms(_max_gc_threads, "%.1lf"),

   _last_termination_attempts(_max_gc_threads, SIZE_FORMAT),

   _last_gc_worker_end_times_ms(_max_gc_threads, "%.1lf", false),

   _last_gc_worker_times_ms(_max_gc_threads, "%.1lf"),

   _last_gc_worker_other_times_ms(_max_gc_threads, "%.1lf"),

   _cur_string_dedup_queue_fixup_worker_times_ms(_max_gc_threads, "%.1lf"),

   _cur_string_dedup_table_fixup_worker_times_ms(_max_gc_threads, "%.1lf")

 {

   assert(max_gc_threads > 0, "Must have some GC threads");

 }

 void G1GCPhaseTimes::note_gc_start(uint active_gc_threads) {

   assert(active_gc_threads > 0, "The number of threads must be > 0");

   assert(active_gc_threads <= _max_gc_threads, "The number of active threads must be <= the max nubmer of threads");

   _active_gc_threads = active_gc_threads;

   _last_gc_worker_start_times_ms.reset();

   _last_ext_root_scan_times_ms.reset();

   _last_satb_filtering_times_ms.reset();

   _last_update_rs_times_ms.reset();

   _last_update_rs_processed_buffers.reset();

   _last_scan_rs_times_ms.reset();

   _last_strong_code_root_scan_times_ms.reset();

   _last_strong_code_root_mark_times_ms.reset();

   _last_obj_copy_times_ms.reset();

   _last_termination_times_ms.reset();

   _last_termination_attempts.reset();

   _last_gc_worker_end_times_ms.reset();

   _last_gc_worker_times_ms.reset();

   _last_gc_worker_other_times_ms.reset();

 }

 void G1GCPhaseTimes::note_gc_end() {

   _last_gc_worker_start_times_ms.verify();

   _last_ext_root_scan_times_ms.verify();

   _last_satb_filtering_times_ms.verify();

   _last_update_rs_times_ms.verify();

   _last_update_rs_processed_buffers.verify();

   _last_scan_rs_times_ms.verify();

   _last_strong_code_root_scan_times_ms.verify();

   _last_strong_code_root_mark_times_ms.verify();

   _last_obj_copy_times_ms.verify();

   _last_termination_times_ms.verify();

   _last_termination_attempts.verify();

   _last_gc_worker_end_times_ms.verify();

   for (uint i = 0; i < _active_gc_threads; i++) {

     double worker_time = _last_gc_worker_end_times_ms.get(i) - _last_gc_worker_start_times_ms.get(i);

     _last_gc_worker_times_ms.set(i, worker_time);

     double worker_known_time = _last_ext_root_scan_times_ms.get(i) +

                                _last_satb_filtering_times_ms.get(i) +

                                _last_update_rs_times_ms.get(i) +

                                _last_scan_rs_times_ms.get(i) +

                                _last_strong_code_root_scan_times_ms.get(i) +

                                _last_strong_code_root_mark_times_ms.get(i) +

                                _last_obj_copy_times_ms.get(i) +

                                _last_termination_times_ms.get(i);

     double worker_other_time = worker_time - worker_known_time;

     _last_gc_worker_other_times_ms.set(i, worker_other_time);

   }

   _last_gc_worker_times_ms.verify();

   _last_gc_worker_other_times_ms.verify();

 }

 void G1GCPhaseTimes::note_string_dedup_fixup_start() {

   _cur_string_dedup_queue_fixup_worker_times_ms.reset();

   _cur_string_dedup_table_fixup_worker_times_ms.reset();

 }

 void G1GCPhaseTimes::note_string_dedup_fixup_end() {

   _cur_string_dedup_queue_fixup_worker_times_ms.verify();

   _cur_string_dedup_table_fixup_worker_times_ms.verify();

 }

 void G1GCPhaseTimes::print_stats(int level, const char* str, double value) {

   LineBuffer(level).append_and_print_cr("[%s: %.1lf ms]", str, value);

 }

 void G1GCPhaseTimes::print_stats(int level, const char* str, double value, int workers) {

   LineBuffer(level).append_and_print_cr("[%s: %.1lf ms, GC Workers: %d]", str, value, workers);

 }

 double G1GCPhaseTimes::accounted_time_ms() {

     // Subtract the root region scanning wait time. It's initialized to

     // zero at the start of the pause.

     double misc_time_ms = _root_region_scan_wait_time_ms;

     misc_time_ms += _cur_collection_par_time_ms;

     // Now subtract the time taken to fix up roots in generated code

     misc_time_ms += _cur_collection_code_root_fixup_time_ms;

     // Strong code root migration time

     misc_time_ms += _cur_strong_code_root_migration_time_ms;

     // Strong code root purge time

     misc_time_ms += _cur_strong_code_root_purge_time_ms;

     if (G1StringDedup::is_enabled()) {

       // String dedup fixup time

       misc_time_ms += _cur_string_dedup_fixup_time_ms;

     }

     // Subtract the time taken to clean the card table from the

     // current value of "other time"

     misc_time_ms += _cur_clear_ct_time_ms;

     return misc_time_ms;

 }

 void G1GCPhaseTimes::print(double pause_time_sec) {

   if (_root_region_scan_wait_time_ms > 0.0) {

     print_stats(1, "Root Region Scan Waiting", _root_region_scan_wait_time_ms);

   }

   if (G1CollectedHeap::use_parallel_gc_threads()) {

     print_stats(1, "Parallel Time", _cur_collection_par_time_ms, _active_gc_threads);

     _last_gc_worker_start_times_ms.print(2, "GC Worker Start (ms)");

     _last_ext_root_scan_times_ms.print(2, "Ext Root Scanning (ms)");

     if (_last_satb_filtering_times_ms.sum() > 0.0) {

       _last_satb_filtering_times_ms.print(2, "SATB Filtering (ms)");

     }

     if (_last_strong_code_root_mark_times_ms.sum() > 0.0) {

      _last_strong_code_root_mark_times_ms.print(2, "Code Root Marking (ms)");

     }

     _last_update_rs_times_ms.print(2, "Update RS (ms)");

       _last_update_rs_processed_buffers.print(3, "Processed Buffers");

     _last_scan_rs_times_ms.print(2, "Scan RS (ms)");

     _last_strong_code_root_scan_times_ms.print(2, "Code Root Scanning (ms)");

     _last_obj_copy_times_ms.print(2, "Object Copy (ms)");

     _last_termination_times_ms.print(2, "Termination (ms)");

     if (G1Log::finest()) {

       _last_termination_attempts.print(3, "Termination Attempts");

     }

     _last_gc_worker_other_times_ms.print(2, "GC Worker Other (ms)");

     _last_gc_worker_times_ms.print(2, "GC Worker Total (ms)");

     _last_gc_worker_end_times_ms.print(2, "GC Worker End (ms)");

   } else {

     _last_ext_root_scan_times_ms.print(1, "Ext Root Scanning (ms)");

     if (_last_satb_filtering_times_ms.sum() > 0.0) {

       _last_satb_filtering_times_ms.print(1, "SATB Filtering (ms)");

     }

     if (_last_strong_code_root_mark_times_ms.sum() > 0.0) {

       _last_strong_code_root_mark_times_ms.print(1, "Code Root Marking (ms)");

     }

     _last_update_rs_times_ms.print(1, "Update RS (ms)");

       _last_update_rs_processed_buffers.print(2, "Processed Buffers");

     _last_scan_rs_times_ms.print(1, "Scan RS (ms)");

     _last_strong_code_root_scan_times_ms.print(1, "Code Root Scanning (ms)");

     _last_obj_copy_times_ms.print(1, "Object Copy (ms)");

   }

   print_stats(1, "Code Root Fixup", _cur_collection_code_root_fixup_time_ms);

   print_stats(1, "Code Root Migration", _cur_strong_code_root_migration_time_ms);

   print_stats(1, "Code Root Purge", _cur_strong_code_root_purge_time_ms);

   if (G1StringDedup::is_enabled()) {

     print_stats(1, "String Dedup Fixup", _cur_string_dedup_fixup_time_ms, _active_gc_threads);

     _cur_string_dedup_queue_fixup_worker_times_ms.print(2, "Queue Fixup (ms)");

     _cur_string_dedup_table_fixup_worker_times_ms.print(2, "Table Fixup (ms)");

   }

   print_stats(1, "Clear CT", _cur_clear_ct_time_ms);

   double misc_time_ms = pause_time_sec * MILLIUNITS - accounted_time_ms();

   print_stats(1, "Other", misc_time_ms);

   if (_cur_verify_before_time_ms > 0.0) {

     print_stats(2, "Verify Before", _cur_verify_before_time_ms);

   }

   if (G1CollectedHeap::heap()->evacuation_failed()) {

     double evac_fail_handling = _cur_evac_fail_recalc_used + _cur_evac_fail_remove_self_forwards +

       _cur_evac_fail_restore_remsets;

     print_stats(2, "Evacuation Failure", evac_fail_handling);

     if (G1Log::finest()) {

       print_stats(3, "Recalculate Used", _cur_evac_fail_recalc_used);

       print_stats(3, "Remove Self Forwards", _cur_evac_fail_remove_self_forwards);

       print_stats(3, "Restore RemSet", _cur_evac_fail_restore_remsets);

     }

   }

   print_stats(2, "Choose CSet",

     (_recorded_young_cset_choice_time_ms +

     _recorded_non_young_cset_choice_time_ms));

   print_stats(2, "Ref Proc", _cur_ref_proc_time_ms);

   print_stats(2, "Ref Enq", _cur_ref_enq_time_ms);

   if (G1DeferredRSUpdate) {

     print_stats(2, "Redirty Cards", _recorded_redirty_logged_cards_time_ms);

   }

   print_stats(2, "Free CSet",

     (_recorded_young_free_cset_time_ms +

     _recorded_non_young_free_cset_time_ms));

   if (G1Log::finest()) {

     print_stats(3, "Young Free CSet", _recorded_young_free_cset_time_ms);

     print_stats(3, "Non-Young Free CSet", _recorded_non_young_free_cset_time_ms);

   }

   if (_cur_verify_after_time_ms > 0.0) {

     print_stats(2, "Verify After", _cur_verify_after_time_ms);

   }

 }