jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1RemSetSummary.cpp@e7d0505c8a30 (annotated)

src/share/vm/gc_implementation/g1/g1RemSetSummary.cpp@e7d0505c8a30 (annotated)

src/share/vm/gc_implementation/g1/g1RemSetSummary.cpp

Fri, 10 Oct 2014 15:51:58 +0200

author: tschatzl
date: Fri, 10 Oct 2014 15:51:58 +0200
changeset 7257: e7d0505c8a30
parent 7208: 7baf47cb97cb
child 7535: 7ae4e26cb1e0
child 8439: b857e4abb00c
permissions: -rw-r--r--

8059758: Footprint regressions with JDK-8038423
Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything.
Reviewed-by: jwilhelm, brutisso

 /*
  * Copyright (c) 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/g1/concurrentG1Refine.hpp"
 #include "gc_implementation/g1/concurrentG1RefineThread.hpp"
 #include "gc_implementation/g1/heapRegion.hpp"
 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
 #include "gc_implementation/g1/g1RemSet.inline.hpp"
 #include "gc_implementation/g1/g1RemSetSummary.hpp"
 #include "gc_implementation/g1/heapRegionRemSet.hpp"
 #include "runtime/thread.inline.hpp"
 class GetRSThreadVTimeClosure : public ThreadClosure {
 private:
   G1RemSetSummary* _summary;
   uint _counter;
 public:
   GetRSThreadVTimeClosure(G1RemSetSummary * summary) : ThreadClosure(), _summary(summary), _counter(0) {
     assert(_summary != NULL, "just checking");
   }
   virtual void do_thread(Thread* t) {
     ConcurrentG1RefineThread* crt = (ConcurrentG1RefineThread*) t;
     _summary->set_rs_thread_vtime(_counter, crt->vtime_accum());
     _counter++;
   }
 };
 void G1RemSetSummary::update() {
   _num_refined_cards = remset()->conc_refine_cards();
   DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set();
   _num_processed_buf_mutator = dcqs.processed_buffers_mut();
   _num_processed_buf_rs_threads = dcqs.processed_buffers_rs_thread();
   _num_coarsenings = HeapRegionRemSet::n_coarsenings();
   ConcurrentG1Refine * cg1r = G1CollectedHeap::heap()->concurrent_g1_refine();
   if (_rs_threads_vtimes != NULL) {
     GetRSThreadVTimeClosure p(this);
     cg1r->worker_threads_do(&p);
   }
   set_sampling_thread_vtime(cg1r->sampling_thread()->vtime_accum());
 }
 void G1RemSetSummary::set_rs_thread_vtime(uint thread, double value) {
   assert(_rs_threads_vtimes != NULL, "just checking");
   assert(thread < _num_vtimes, "just checking");
   _rs_threads_vtimes[thread] = value;
 }
 double G1RemSetSummary::rs_thread_vtime(uint thread) const {
   assert(_rs_threads_vtimes != NULL, "just checking");
   assert(thread < _num_vtimes, "just checking");
   return _rs_threads_vtimes[thread];
 }
 void G1RemSetSummary::initialize(G1RemSet* remset) {
   assert(_rs_threads_vtimes == NULL, "just checking");
   assert(remset != NULL, "just checking");
   _remset = remset;
   _num_vtimes = ConcurrentG1Refine::thread_num();
   _rs_threads_vtimes = NEW_C_HEAP_ARRAY(double, _num_vtimes, mtGC);
   memset(_rs_threads_vtimes, 0, sizeof(double) * _num_vtimes);
   update();
 }
 void G1RemSetSummary::set(G1RemSetSummary* other) {
   assert(other != NULL, "just checking");
   assert(remset() == other->remset(), "just checking");
   assert(_num_vtimes == other->_num_vtimes, "just checking");
   _num_refined_cards = other->num_concurrent_refined_cards();
   _num_processed_buf_mutator = other->num_processed_buf_mutator();
   _num_processed_buf_rs_threads = other->num_processed_buf_rs_threads();
   _num_coarsenings = other->_num_coarsenings;
   memcpy(_rs_threads_vtimes, other->_rs_threads_vtimes, sizeof(double) * _num_vtimes);
   set_sampling_thread_vtime(other->sampling_thread_vtime());
 }
 void G1RemSetSummary::subtract_from(G1RemSetSummary* other) {
   assert(other != NULL, "just checking");
   assert(remset() == other->remset(), "just checking");
   assert(_num_vtimes == other->_num_vtimes, "just checking");
   _num_refined_cards = other->num_concurrent_refined_cards() - _num_refined_cards;
   _num_processed_buf_mutator = other->num_processed_buf_mutator() - _num_processed_buf_mutator;
   _num_processed_buf_rs_threads = other->num_processed_buf_rs_threads() - _num_processed_buf_rs_threads;
   _num_coarsenings = other->num_coarsenings() - _num_coarsenings;
   for (uint i = 0; i < _num_vtimes; i++) {
     set_rs_thread_vtime(i, other->rs_thread_vtime(i) - rs_thread_vtime(i));
   }
   _sampling_thread_vtime = other->sampling_thread_vtime() - _sampling_thread_vtime;
 }
 static double percent_of(size_t numerator, size_t denominator) {
   if (denominator != 0) {
     return (double)numerator / denominator * 100.0f;
   } else {
     return 0.0f;
   }
 }
 static size_t round_to_K(size_t value) {
   return value / K;
 }
 class RegionTypeCounter VALUE_OBJ_CLASS_SPEC {
 private:
   const char* _name;
   size_t _rs_mem_size;
   size_t _cards_occupied;
   size_t _amount;
   size_t _code_root_mem_size;
   size_t _code_root_elems;
   double rs_mem_size_percent_of(size_t total) {
     return percent_of(_rs_mem_size, total);
   }
   double cards_occupied_percent_of(size_t total) {
     return percent_of(_cards_occupied, total);
   }
   double code_root_mem_size_percent_of(size_t total) {
     return percent_of(_code_root_mem_size, total);
   }
   double code_root_elems_percent_of(size_t total) {
     return percent_of(_code_root_elems, total);
   }
   size_t amount() const { return _amount; }
 public:
   RegionTypeCounter(const char* name) : _name(name), _rs_mem_size(0), _cards_occupied(0),
     _amount(0), _code_root_mem_size(0), _code_root_elems(0) { }
   void add(size_t rs_mem_size, size_t cards_occupied, size_t code_root_mem_size,
     size_t code_root_elems) {
     _rs_mem_size += rs_mem_size;
     _cards_occupied += cards_occupied;
     _code_root_mem_size += code_root_mem_size;
     _code_root_elems += code_root_elems;
     _amount++;
   }
   size_t rs_mem_size() const { return _rs_mem_size; }
   size_t cards_occupied() const { return _cards_occupied; }
   size_t code_root_mem_size() const { return _code_root_mem_size; }
   size_t code_root_elems() const { return _code_root_elems; }
   void print_rs_mem_info_on(outputStream * out, size_t total) {
     out->print_cr("    "SIZE_FORMAT_W(8)"K (%5.1f%%) by "SIZE_FORMAT" %s regions",
         round_to_K(rs_mem_size()), rs_mem_size_percent_of(total), amount(), _name);
   }
   void print_cards_occupied_info_on(outputStream * out, size_t total) {
     out->print_cr("     "SIZE_FORMAT_W(8)" (%5.1f%%) entries by "SIZE_FORMAT" %s regions",
         cards_occupied(), cards_occupied_percent_of(total), amount(), _name);
   }
   void print_code_root_mem_info_on(outputStream * out, size_t total) {
     out->print_cr("    "SIZE_FORMAT_W(8)"K (%5.1f%%) by "SIZE_FORMAT" %s regions",
         round_to_K(code_root_mem_size()), code_root_mem_size_percent_of(total), amount(), _name);
   }
   void print_code_root_elems_info_on(outputStream * out, size_t total) {
     out->print_cr("     "SIZE_FORMAT_W(8)" (%5.1f%%) elements by "SIZE_FORMAT" %s regions",
         code_root_elems(), code_root_elems_percent_of(total), amount(), _name);
   }
 };
 class HRRSStatsIter: public HeapRegionClosure {
 private:
   RegionTypeCounter _young;
   RegionTypeCounter _humonguous;
   RegionTypeCounter _free;
   RegionTypeCounter _old;
   RegionTypeCounter _all;
   size_t _max_rs_mem_sz;
   HeapRegion* _max_rs_mem_sz_region;
   size_t total_rs_mem_sz() const            { return _all.rs_mem_size(); }
   size_t total_cards_occupied() const       { return _all.cards_occupied(); }
   size_t max_rs_mem_sz() const              { return _max_rs_mem_sz; }
   HeapRegion* max_rs_mem_sz_region() const  { return _max_rs_mem_sz_region; }
   size_t _max_code_root_mem_sz;
   HeapRegion* _max_code_root_mem_sz_region;
   size_t total_code_root_mem_sz() const     { return _all.code_root_mem_size(); }
   size_t total_code_root_elems() const      { return _all.code_root_elems(); }
   size_t max_code_root_mem_sz() const       { return _max_code_root_mem_sz; }
   HeapRegion* max_code_root_mem_sz_region() const { return _max_code_root_mem_sz_region; }
 public:
   HRRSStatsIter() : _all("All"), _young("Young"), _humonguous("Humonguous"),
     _free("Free"), _old("Old"), _max_code_root_mem_sz_region(NULL), _max_rs_mem_sz_region(NULL),
     _max_rs_mem_sz(0), _max_code_root_mem_sz(0)
   {}
   bool doHeapRegion(HeapRegion* r) {
     HeapRegionRemSet* hrrs = r->rem_set();
     // HeapRegionRemSet::mem_size() includes the
     // size of the strong code roots
     size_t rs_mem_sz = hrrs->mem_size();
     if (rs_mem_sz > _max_rs_mem_sz) {
       _max_rs_mem_sz = rs_mem_sz;
       _max_rs_mem_sz_region = r;
     }
     size_t occupied_cards = hrrs->occupied();
     size_t code_root_mem_sz = hrrs->strong_code_roots_mem_size();
     if (code_root_mem_sz > max_code_root_mem_sz()) {
       _max_code_root_mem_sz = code_root_mem_sz;
       _max_code_root_mem_sz_region = r;
     }
     size_t code_root_elems = hrrs->strong_code_roots_list_length();
     RegionTypeCounter* current = NULL;
     if (r->is_free()) {
       current = &_free;
     } else if (r->is_young()) {
       current = &_young;
     } else if (r->isHumongous()) {
       current = &_humonguous;
     } else if (r->is_old()) {
       current = &_old;
     } else {
       ShouldNotReachHere();
     }
     current->add(rs_mem_sz, occupied_cards, code_root_mem_sz, code_root_elems);
     _all.add(rs_mem_sz, occupied_cards, code_root_mem_sz, code_root_elems);
     return false;
   }
   void print_summary_on(outputStream* out) {
     RegionTypeCounter* counters[] = { &_young, &_humonguous, &_free, &_old, NULL };
     out->print_cr("\n Current rem set statistics");
     out->print_cr("  Total per region rem sets sizes = "SIZE_FORMAT"K."
                   " Max = "SIZE_FORMAT"K.",
                   round_to_K(total_rs_mem_sz()), round_to_K(max_rs_mem_sz()));
     for (RegionTypeCounter** current = &counters[0]; *current != NULL; current++) {
       (*current)->print_rs_mem_info_on(out, total_rs_mem_sz());
     }
     out->print_cr("   Static structures = "SIZE_FORMAT"K,"
                   " free_lists = "SIZE_FORMAT"K.",
                   round_to_K(HeapRegionRemSet::static_mem_size()),
                   round_to_K(HeapRegionRemSet::fl_mem_size()));
     out->print_cr("    "SIZE_FORMAT" occupied cards represented.",
                   total_cards_occupied());
     for (RegionTypeCounter** current = &counters[0]; *current != NULL; current++) {
       (*current)->print_cards_occupied_info_on(out, total_cards_occupied());
     }
     // Largest sized rem set region statistics
     HeapRegionRemSet* rem_set = max_rs_mem_sz_region()->rem_set();
     out->print_cr("    Region with largest rem set = "HR_FORMAT", "
                   "size = "SIZE_FORMAT "K, occupied = "SIZE_FORMAT"K.",
                   HR_FORMAT_PARAMS(max_rs_mem_sz_region()),
                   round_to_K(rem_set->mem_size()),
                   round_to_K(rem_set->occupied()));
     // Strong code root statistics
     HeapRegionRemSet* max_code_root_rem_set = max_code_root_mem_sz_region()->rem_set();
     out->print_cr("  Total heap region code root sets sizes = "SIZE_FORMAT"K."
                   "  Max = "SIZE_FORMAT"K.",
                   round_to_K(total_code_root_mem_sz()),
                   round_to_K(max_code_root_rem_set->strong_code_roots_mem_size()));
     for (RegionTypeCounter** current = &counters[0]; *current != NULL; current++) {
       (*current)->print_code_root_mem_info_on(out, total_code_root_mem_sz());
     }
     out->print_cr("    "SIZE_FORMAT" code roots represented.",
                   total_code_root_elems());
     for (RegionTypeCounter** current = &counters[0]; *current != NULL; current++) {
       (*current)->print_code_root_elems_info_on(out, total_code_root_elems());
     }
     out->print_cr("    Region with largest amount of code roots = "HR_FORMAT", "
                   "size = "SIZE_FORMAT "K, num_elems = "SIZE_FORMAT".",
                   HR_FORMAT_PARAMS(max_code_root_mem_sz_region()),
                   round_to_K(max_code_root_rem_set->strong_code_roots_mem_size()),
                   round_to_K(max_code_root_rem_set->strong_code_roots_list_length()));
   }
 };
 void G1RemSetSummary::print_on(outputStream* out) {
   out->print_cr("\n Recent concurrent refinement statistics");
   out->print_cr("  Processed "SIZE_FORMAT" cards",
                 num_concurrent_refined_cards());
   out->print_cr("  Of "SIZE_FORMAT" completed buffers:", num_processed_buf_total());
   out->print_cr("     "SIZE_FORMAT_W(8)" (%5.1f%%) by concurrent RS threads.",
                 num_processed_buf_total(),
                 percent_of(num_processed_buf_rs_threads(), num_processed_buf_total()));
   out->print_cr("     "SIZE_FORMAT_W(8)" (%5.1f%%) by mutator threads.",
                 num_processed_buf_mutator(),
                 percent_of(num_processed_buf_mutator(), num_processed_buf_total()));
   out->print_cr("  Did "SIZE_FORMAT" coarsenings.", num_coarsenings());
   out->print_cr("  Concurrent RS threads times (s)");
   out->print("     ");
   for (uint i = 0; i < _num_vtimes; i++) {
     out->print("    %5.2f", rs_thread_vtime(i));
   }
   out->cr();
   out->print_cr("  Concurrent sampling threads times (s)");
   out->print_cr("         %5.2f", sampling_thread_vtime());
   HRRSStatsIter blk;
   G1CollectedHeap::heap()->heap_region_iterate(&blk);
   blk.print_summary_on(out);
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/g1/g1RemSetSummary.cpp@e7d0505c8a30 (annotated)

src/share/vm/gc_implementation/g1/g1RemSetSummary.cpp