jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/shared/allocationStats.hpp@7426d8d76305 (annotated)

src/share/vm/gc_implementation/shared/allocationStats.hpp@7426d8d76305 (annotated)

src/share/vm/gc_implementation/shared/allocationStats.hpp

Thu, 13 Feb 2014 17:44:39 +0100

author: stefank
date: Thu, 13 Feb 2014 17:44:39 +0100
changeset 6971: 7426d8d76305
parent 6680: 78bbf4d43a14
child 6876: 710a3c8b516e
permissions: -rw-r--r--

8034761: Remove the do_code_roots parameter from process_strong_roots
Reviewed-by: tschatzl, mgerdin, jmasa

 /*
  * Copyright (c) 2001, 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.
  *
  */
 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_ALLOCATIONSTATS_HPP
 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_ALLOCATIONSTATS_HPP
 #include "utilities/macros.hpp"
 #include "memory/allocation.hpp"
 #include "utilities/globalDefinitions.hpp"
 #include "gc_implementation/shared/gcUtil.hpp"
 class AllocationStats VALUE_OBJ_CLASS_SPEC {
   // A duration threshold (in ms) used to filter
   // possibly unreliable samples.
   static float _threshold;
   // We measure the demand between the end of the previous sweep and
   // beginning of this sweep:
   //   Count(end_last_sweep) - Count(start_this_sweep)
   //     + split_births(between) - split_deaths(between)
   // The above number divided by the time since the end of the
   // previous sweep gives us a time rate of demand for blocks
   // of this size. We compute a padded average of this rate as
   // our current estimate for the time rate of demand for blocks
   // of this size. Similarly, we keep a padded average for the time
   // between sweeps. Our current estimate for demand for blocks of
   // this size is then simply computed as the product of these two
   // estimates.
   AdaptivePaddedAverage _demand_rate_estimate;
   ssize_t     _desired;         // Demand stimate computed as described above
   ssize_t     _coal_desired;     // desired +/- small-percent for tuning coalescing
   ssize_t     _surplus;         // count - (desired +/- small-percent),
                                 // used to tune splitting in best fit
   ssize_t     _bfr_surp;         // surplus at start of current sweep
   ssize_t     _prev_sweep;       // count from end of previous sweep
   ssize_t     _before_sweep;     // count from before current sweep
   ssize_t     _coal_births;      // additional chunks from coalescing
   ssize_t     _coal_deaths;      // loss from coalescing
   ssize_t     _split_births;     // additional chunks from splitting
   ssize_t     _split_deaths;     // loss from splitting
   size_t      _returned_bytes;   // number of bytes returned to list.
  public:
   void initialize(bool split_birth = false) {
     AdaptivePaddedAverage* dummy =
       new (&_demand_rate_estimate) AdaptivePaddedAverage(CMS_FLSWeight,
                                                          CMS_FLSPadding);
     _desired = 0;
     _coal_desired = 0;
     _surplus = 0;
     _bfr_surp = 0;
     _prev_sweep = 0;
     _before_sweep = 0;
     _coal_births = 0;
     _coal_deaths = 0;
     _split_births = (split_birth ? 1 : 0);
     _split_deaths = 0;
     _returned_bytes = 0;
   }
   AllocationStats() {
     initialize();
   }
   // The rate estimate is in blocks per second.
   void compute_desired(size_t count,
                        float inter_sweep_current,
                        float inter_sweep_estimate,
                        float intra_sweep_estimate) {
     // If the latest inter-sweep time is below our granularity
     // of measurement, we may call in here with
     // inter_sweep_current == 0. However, even for suitably small
     // but non-zero inter-sweep durations, we may not trust the accuracy
     // of accumulated data, since it has not been "integrated"
     // (read "low-pass-filtered") long enough, and would be
     // vulnerable to noisy glitches. In such cases, we
     // ignore the current sample and use currently available
     // historical estimates.
     assert(prev_sweep() + split_births() + coal_births()        // "Total Production Stock"
            >= split_deaths() + coal_deaths() + (ssize_t)count, // "Current stock + depletion"
            "Conservation Principle");
     if (inter_sweep_current > _threshold) {
       ssize_t demand = prev_sweep() - (ssize_t)count + split_births() + coal_births()
                        - split_deaths() - coal_deaths();
       assert(demand >= 0,
              err_msg("Demand (" SSIZE_FORMAT ") should be non-negative for "
                      PTR_FORMAT " (size=" SIZE_FORMAT ")",
                      demand, p2i(this), count));
       // Defensive: adjust for imprecision in event counting
       if (demand < 0) {
         demand = 0;
       }
       float old_rate = _demand_rate_estimate.padded_average();
       float rate = ((float)demand)/inter_sweep_current;
       _demand_rate_estimate.sample(rate);
       float new_rate = _demand_rate_estimate.padded_average();
       ssize_t old_desired = _desired;
       float delta_ise = (CMSExtrapolateSweep ? intra_sweep_estimate : 0.0);
       _desired = (ssize_t)(new_rate * (inter_sweep_estimate + delta_ise));
       if (PrintFLSStatistics > 1) {
         gclog_or_tty->print_cr(
         "demand: " SSIZE_FORMAT ", old_rate: %f, current_rate: %f, new_rate: %f, old_desired: " SSIZE_FORMAT ", new_desired: " SSIZE_FORMAT,
                            demand,     old_rate,             rate,     new_rate,                 old_desired,                   _desired);
       }
     }
   }
   ssize_t desired() const { return _desired; }
   void set_desired(ssize_t v) { _desired = v; }
   ssize_t coal_desired() const { return _coal_desired; }
   void set_coal_desired(ssize_t v) { _coal_desired = v; }
   ssize_t surplus() const { return _surplus; }
   void set_surplus(ssize_t v) { _surplus = v; }
   void increment_surplus() { _surplus++; }
   void decrement_surplus() { _surplus--; }
   ssize_t bfr_surp() const { return _bfr_surp; }
   void set_bfr_surp(ssize_t v) { _bfr_surp = v; }
   ssize_t prev_sweep() const { return _prev_sweep; }
   void set_prev_sweep(ssize_t v) { _prev_sweep = v; }
   ssize_t before_sweep() const { return _before_sweep; }
   void set_before_sweep(ssize_t v) { _before_sweep = v; }
   ssize_t coal_births() const { return _coal_births; }
   void set_coal_births(ssize_t v) { _coal_births = v; }
   void increment_coal_births() { _coal_births++; }
   ssize_t coal_deaths() const { return _coal_deaths; }
   void set_coal_deaths(ssize_t v) { _coal_deaths = v; }
   void increment_coal_deaths() { _coal_deaths++; }
   ssize_t split_births() const { return _split_births; }
   void set_split_births(ssize_t v) { _split_births = v; }
   void increment_split_births() { _split_births++; }
   ssize_t split_deaths() const { return _split_deaths; }
   void set_split_deaths(ssize_t v) { _split_deaths = v; }
   void increment_split_deaths() { _split_deaths++; }
   NOT_PRODUCT(
     size_t returned_bytes() const { return _returned_bytes; }
     void set_returned_bytes(size_t v) { _returned_bytes = v; }
   )
 };
 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_ALLOCATIONSTATS_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/shared/allocationStats.hpp@7426d8d76305 (annotated)

src/share/vm/gc_implementation/shared/allocationStats.hpp