jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/concurrentG1Refine.cpp@7ea5ca260b28 (annotated)

src/share/vm/gc_implementation/g1/concurrentG1Refine.cpp@7ea5ca260b28 (annotated)

src/share/vm/gc_implementation/g1/concurrentG1Refine.cpp

Sat, 07 Mar 2009 11:07:37 -0500

author: tonyp
date: Sat, 07 Mar 2009 11:07:37 -0500
changeset 1054: 7ea5ca260b28
parent 777: 37f87013dfd8
child 1072: 25e146966e7c
permissions: -rw-r--r--

6814467: G1: small fixes related to concurrent marking verboseness
Summary: A few small fixes to remove some inconsistencies in the concurrent mark-related verbose GC output.
Reviewed-by: jmasa

 /*
  * Copyright 2001-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  *
  */
 #include "incls/_precompiled.incl"
 #include "incls/_concurrentG1Refine.cpp.incl"
 bool ConcurrentG1Refine::_enabled = false;
 ConcurrentG1Refine::ConcurrentG1Refine() :
   _pya(PYA_continue), _last_pya(PYA_continue),
   _last_cards_during(), _first_traversal(false),
   _card_counts(NULL), _cur_card_count_histo(NULL), _cum_card_count_histo(NULL),
   _hot_cache(NULL),
   _def_use_cache(false), _use_cache(false),
   _n_periods(0), _total_cards(0), _total_travs(0)
 {
   if (G1ConcRefine) {
     _cg1rThread = new ConcurrentG1RefineThread(this);
     assert(cg1rThread() != NULL, "Conc refine should have been created");
     assert(cg1rThread()->cg1r() == this,
            "Conc refine thread should refer to this");
   } else {
     _cg1rThread = NULL;
   }
 }
 void ConcurrentG1Refine::init() {
   if (G1ConcRSLogCacheSize > 0 || G1ConcRSCountTraversals) {
     G1CollectedHeap* g1h = G1CollectedHeap::heap();
     _n_card_counts =
       (unsigned) (g1h->g1_reserved_obj_bytes() >> CardTableModRefBS::card_shift);
     _card_counts = NEW_C_HEAP_ARRAY(unsigned char, _n_card_counts);
     for (size_t i = 0; i < _n_card_counts; i++) _card_counts[i] = 0;
     ModRefBarrierSet* bs = g1h->mr_bs();
     guarantee(bs->is_a(BarrierSet::CardTableModRef), "Precondition");
     CardTableModRefBS* ctbs = (CardTableModRefBS*)bs;
     _ct_bot = ctbs->byte_for_const(g1h->reserved_region().start());
     if (G1ConcRSCountTraversals) {
       _cur_card_count_histo = NEW_C_HEAP_ARRAY(unsigned, 256);
       _cum_card_count_histo = NEW_C_HEAP_ARRAY(unsigned, 256);
       for (int i = 0; i < 256; i++) {
         _cur_card_count_histo[i] = 0;
         _cum_card_count_histo[i] = 0;
       }
     }
   }
   if (G1ConcRSLogCacheSize > 0) {
     _def_use_cache = true;
     _use_cache = true;
     _hot_cache_size = (1 << G1ConcRSLogCacheSize);
     _hot_cache = NEW_C_HEAP_ARRAY(jbyte*, _hot_cache_size);
     _n_hot = 0;
     _hot_cache_idx = 0;
   }
 }
 ConcurrentG1Refine::~ConcurrentG1Refine() {
   if (G1ConcRSLogCacheSize > 0 || G1ConcRSCountTraversals) {
     assert(_card_counts != NULL, "Logic");
     FREE_C_HEAP_ARRAY(unsigned char, _card_counts);
     assert(_cur_card_count_histo != NULL, "Logic");
     FREE_C_HEAP_ARRAY(unsigned, _cur_card_count_histo);
     assert(_cum_card_count_histo != NULL, "Logic");
     FREE_C_HEAP_ARRAY(unsigned, _cum_card_count_histo);
   }
   if (G1ConcRSLogCacheSize > 0) {
     assert(_hot_cache != NULL, "Logic");
     FREE_C_HEAP_ARRAY(jbyte*, _hot_cache);
   }
 }
 bool ConcurrentG1Refine::refine() {
   G1CollectedHeap* g1h = G1CollectedHeap::heap();
   unsigned cards_before = g1h->g1_rem_set()->conc_refine_cards();
   clear_hot_cache();  // Any previous values in this are now invalid.
   g1h->g1_rem_set()->concurrentRefinementPass(this);
   _traversals++;
   unsigned cards_after = g1h->g1_rem_set()->conc_refine_cards();
   unsigned cards_during = cards_after-cards_before;
   // If this is the first traversal in the current enabling
   // and we did some cards, or if the number of cards found is decreasing
   // sufficiently quickly, then keep going.  Otherwise, sleep a while.
   bool res =
     (_first_traversal && cards_during > 0)
     ||
     (!_first_traversal && cards_during * 3 < _last_cards_during * 2);
   _last_cards_during = cards_during;
   _first_traversal = false;
   return res;
 }
 void ConcurrentG1Refine::enable() {
   MutexLocker x(G1ConcRefine_mon);
   if (!_enabled) {
     _enabled = true;
     _first_traversal = true; _last_cards_during = 0;
     G1ConcRefine_mon->notify_all();
   }
 }
 unsigned ConcurrentG1Refine::disable() {
   MutexLocker x(G1ConcRefine_mon);
   if (_enabled) {
     _enabled = false;
     return _traversals;
   } else {
     return 0;
   }
 }
 void ConcurrentG1Refine::wait_for_ConcurrentG1Refine_enabled() {
   G1ConcRefine_mon->lock();
   while (!_enabled) {
     G1ConcRefine_mon->wait(Mutex::_no_safepoint_check_flag);
   }
   G1ConcRefine_mon->unlock();
   _traversals = 0;
 };
 void ConcurrentG1Refine::set_pya_restart() {
   // If we're using the log-based RS barrier, the above will cause
   // in-progress traversals of completed log buffers to quit early; we will
   // also abandon all other buffers.
   if (G1RSBarrierUseQueue) {
     DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
     dcqs.abandon_logs();
     if (_cg1rThread->do_traversal()) {
       _pya = PYA_restart;
     } else {
       _cg1rThread->set_do_traversal(true);
       // Reset the post-yield actions.
       _pya = PYA_continue;
       _last_pya = PYA_continue;
     }
   } else {
     _pya = PYA_restart;
   }
 }
 void ConcurrentG1Refine::set_pya_cancel() {
   _pya = PYA_cancel;
 }
 PostYieldAction ConcurrentG1Refine::get_pya() {
   if (_pya != PYA_continue) {
     jint val = _pya;
     while (true) {
       jint val_read = Atomic::cmpxchg(PYA_continue, &_pya, val);
       if (val_read == val) {
         PostYieldAction res = (PostYieldAction)val;
         assert(res != PYA_continue, "Only the refine thread should reset.");
         _last_pya = res;
         return res;
       } else {
         val = val_read;
       }
     }
   }
   // QQQ WELL WHAT DO WE RETURN HERE???
   // make up something!
   return PYA_continue;
 }
 PostYieldAction ConcurrentG1Refine::get_last_pya() {
   PostYieldAction res = _last_pya;
   _last_pya = PYA_continue;
   return res;
 }
 bool ConcurrentG1Refine::do_traversal() {
   return _cg1rThread->do_traversal();
 }
 int ConcurrentG1Refine::add_card_count(jbyte* card_ptr) {
   size_t card_num = (card_ptr - _ct_bot);
   guarantee(0 <= card_num && card_num < _n_card_counts, "Bounds");
   unsigned char cnt = _card_counts[card_num];
   if (cnt < 255) _card_counts[card_num]++;
   return cnt;
   _total_travs++;
 }
 jbyte* ConcurrentG1Refine::cache_insert(jbyte* card_ptr) {
   int count = add_card_count(card_ptr);
   // Count previously unvisited cards.
   if (count == 0) _total_cards++;
   // We'll assume a traversal unless we store it in the cache.
   if (count < G1ConcRSHotCardLimit) {
     _total_travs++;
     return card_ptr;
   }
   // Otherwise, it's hot.
   jbyte* res = NULL;
   MutexLockerEx x(HotCardCache_lock, Mutex::_no_safepoint_check_flag);
   if (_n_hot == _hot_cache_size) {
     _total_travs++;
     res = _hot_cache[_hot_cache_idx];
     _n_hot--;
   }
   // Now _n_hot < _hot_cache_size, and we can insert at _hot_cache_idx.
   _hot_cache[_hot_cache_idx] = card_ptr;
   _hot_cache_idx++;
   if (_hot_cache_idx == _hot_cache_size) _hot_cache_idx = 0;
   _n_hot++;
   return res;
 }
 void ConcurrentG1Refine::clean_up_cache(int worker_i, G1RemSet* g1rs) {
   assert(!use_cache(), "cache should be disabled");
   int start_ind = _hot_cache_idx-1;
   for (int i = 0; i < _n_hot; i++) {
     int ind = start_ind - i;
     if (ind < 0) ind = ind + _hot_cache_size;
     jbyte* entry = _hot_cache[ind];
     if (entry != NULL) {
       g1rs->concurrentRefineOneCard(entry, worker_i);
     }
   }
   _n_hot = 0;
   _hot_cache_idx = 0;
 }
 void ConcurrentG1Refine::clear_and_record_card_counts() {
   if (G1ConcRSLogCacheSize == 0 && !G1ConcRSCountTraversals) return;
   _n_periods++;
   if (G1ConcRSCountTraversals) {
     for (size_t i = 0; i < _n_card_counts; i++) {
       unsigned char bucket = _card_counts[i];
       _cur_card_count_histo[bucket]++;
       _card_counts[i] = 0;
     }
     gclog_or_tty->print_cr("Card counts:");
     for (int i = 0; i < 256; i++) {
       if (_cur_card_count_histo[i] > 0) {
         gclog_or_tty->print_cr("  %3d: %9d", i, _cur_card_count_histo[i]);
         _cum_card_count_histo[i] += _cur_card_count_histo[i];
         _cur_card_count_histo[i] = 0;
       }
     }
   } else {
     assert(G1ConcRSLogCacheSize > 0, "Logic");
     Copy::fill_to_words((HeapWord*)(&_card_counts[0]),
                         _n_card_counts / HeapWordSize);
   }
 }
 void
 ConcurrentG1Refine::
 print_card_count_histo_range(unsigned* histo, int from, int to,
                              float& cum_card_pct,
                              float& cum_travs_pct) {
   unsigned cards = 0;
   unsigned travs = 0;
   guarantee(to <= 256, "Precondition");
   for (int i = from; i < to-1; i++) {
     cards += histo[i];
     travs += histo[i] * i;
   }
   if (to == 256) {
     unsigned histo_card_sum = 0;
     unsigned histo_trav_sum = 0;
     for (int i = 1; i < 255; i++) {
       histo_trav_sum += histo[i] * i;
     }
     cards += histo[255];
     // correct traversals for the last one.
     unsigned travs_255 = (unsigned) (_total_travs - histo_trav_sum);
     travs += travs_255;
   } else {
     cards += histo[to-1];
     travs += histo[to-1] * (to-1);
   }
   float fperiods = (float)_n_periods;
   float f_tot_cards = (float)_total_cards/fperiods;
   float f_tot_travs = (float)_total_travs/fperiods;
   if (cards > 0) {
     float fcards = (float)cards/fperiods;
     float ftravs = (float)travs/fperiods;
     if (to == 256) {
       gclog_or_tty->print(" %4d-       %10.2f%10.2f", from, fcards, ftravs);
     } else {
       gclog_or_tty->print(" %4d-%4d   %10.2f%10.2f", from, to-1, fcards, ftravs);
     }
     float pct_cards = fcards*100.0/f_tot_cards;
     cum_card_pct += pct_cards;
     float pct_travs = ftravs*100.0/f_tot_travs;
     cum_travs_pct += pct_travs;
     gclog_or_tty->print_cr("%10.2f%10.2f%10.2f%10.2f",
                   pct_cards, cum_card_pct,
                   pct_travs, cum_travs_pct);
   }
 }
 void ConcurrentG1Refine::print_final_card_counts() {
   if (!G1ConcRSCountTraversals) return;
   gclog_or_tty->print_cr("Did %d total traversals of %d distinct cards.",
                 _total_travs, _total_cards);
   float fperiods = (float)_n_periods;
   gclog_or_tty->print_cr("  This is an average of %8.2f traversals, %8.2f cards, "
                 "per collection.", (float)_total_travs/fperiods,
                 (float)_total_cards/fperiods);
   gclog_or_tty->print_cr("  This is an average of %8.2f traversals/distinct "
                 "dirty card.\n",
                 _total_cards > 0 ?
                 (float)_total_travs/(float)_total_cards : 0.0);
   gclog_or_tty->print_cr("Histogram:\n\n%10s   %10s%10s%10s%10s%10s%10s",
                 "range", "# cards", "# travs", "% cards", "(cum)",
                 "% travs", "(cum)");
   gclog_or_tty->print_cr("------------------------------------------------------------"
                 "-------------");
   float cum_cards_pct = 0.0;
   float cum_travs_pct = 0.0;
   for (int i = 1; i < 10; i++) {
     print_card_count_histo_range(_cum_card_count_histo, i, i+1,
                                  cum_cards_pct, cum_travs_pct);
   }
   for (int i = 10; i < 100; i += 10) {
     print_card_count_histo_range(_cum_card_count_histo, i, i+10,
                                  cum_cards_pct, cum_travs_pct);
   }
   print_card_count_histo_range(_cum_card_count_histo, 100, 150,
                                cum_cards_pct, cum_travs_pct);
   print_card_count_histo_range(_cum_card_count_histo, 150, 200,
                                cum_cards_pct, cum_travs_pct);
   print_card_count_histo_range(_cum_card_count_histo, 150, 255,
                                cum_cards_pct, cum_travs_pct);
   print_card_count_histo_range(_cum_card_count_histo, 255, 256,
                                cum_cards_pct, cum_travs_pct);
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/g1/concurrentG1Refine.cpp@7ea5ca260b28 (annotated)

src/share/vm/gc_implementation/g1/concurrentG1Refine.cpp