1 /*
   2  * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * version 2 for more details (a copy is included in the LICENSE file that
  12  * accompanied this code).
  13  *
  14  * You should have received a copy of the GNU General Public License version
  15  * 2 along with this work; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  *
  22  */
  23 
  24 #ifndef SHARE_VM_GC_SHENANDOAH_SHENANDOAHPACER_INLINE_HPP
  25 #define SHARE_VM_GC_SHENANDOAH_SHENANDOAHPACER_INLINE_HPP
  26 
  27 #include "gc_implementation/shenandoah/shenandoahPacer.hpp"
  28 #include "runtime/atomic.hpp"
  29 
  30 inline void ShenandoahPacer::report_mark(size_t words) {
  31   report_internal(words);
  32   report_progress_internal(words);
  33 }
  34 
  35 inline void ShenandoahPacer::report_evac(size_t words) {
  36   report_internal(words);
  37 }
  38 
  39 inline void ShenandoahPacer::report_updaterefs(size_t words) {
  40   report_internal(words);
  41 }
  42 
  43 inline void ShenandoahPacer::report_alloc(size_t words) {
  44   report_internal(words);
  45 }
  46 
  47 inline void ShenandoahPacer::report_internal(size_t words) {
  48   assert(ShenandoahPacing, "Only be here when pacing is enabled");
  49   add_budget(words);
  50 }
  51 
  52 inline void ShenandoahPacer::report_progress_internal(size_t words) {
  53   assert(ShenandoahPacing, "Only be here when pacing is enabled");
  54   STATIC_ASSERT(sizeof(size_t) <= sizeof(intptr_t));
  55   Atomic::add_ptr((intptr_t)words, &_progress);
  56 }
  57 
  58 inline void ShenandoahPacer::add_budget(size_t words) {
  59   STATIC_ASSERT(sizeof(size_t) <= sizeof(intptr_t));
  60   intptr_t inc = (intptr_t) words;
  61   intptr_t new_budget = Atomic::add_ptr(inc, &_budget);
  62 
  63   // Was the budget replenished beyond zero? Then all pacing claims
  64   // are satisfied, notify the waiters. Avoid taking any locks here,
  65   // as it can be called from hot paths and/or while holding other locks.
  66   if (new_budget >= 0 && (new_budget - inc) < 0) {
  67     _need_notify_waiters.try_set();
  68   }
  69 }
  70 
  71 #endif //SHARE_VM_GC_SHENANDOAH_SHENANDOAHPACER_INLINE_HPP