/*

 * 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];

}

  assert(_rs_threads_vtimes == NULL, "just checking");

  assert(remset != NULL, "just checking");

  _remset = remset;

  _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("    %8dK (%5.1f%%) by %zd %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("     %8d (%5.1f%%) entries by %zd %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("    %8dK (%5.1f%%) by %zd %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("     %8d (%5.1f%%) elements by %zd %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_region = r;

    }

    size_t code_root_elems = hrrs->strong_code_roots_list_length();

    RegionTypeCounter* current = NULL;

    if (r->is_young()) {

      current = &_young;

    } else if (r->isHumongous()) {

      current = &_humonguous;

    } else if (r->is_empty()) {

      current = &_free;

    } else {

      current = &_old;

    }

    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 %d completed buffers:", num_processed_buf_total());

  out->print_cr("     %8d (%5.1f%%) by concurrent RS threads.",

                num_processed_buf_total(),

                percent_of(num_processed_buf_rs_threads(), num_processed_buf_total()));

  out->print_cr("     %8d (%5.1f%%) by mutator threads.",

                num_processed_buf_mutator(),

                percent_of(num_processed_buf_mutator(), num_processed_buf_total()));

  out->print_cr("  Did %d 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);

}