heap/FullGCActivityCallback.cpp

   1 /*
   2  * Copyright (C) 2014 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  23  * THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "FullGCActivityCallback.h"
  28
  29 #include "VM.h"
  30
  31 namespace JSC {
  32
  33 #if USE(CF) || PLATFORM(EFL)
  34
  35 #if !PLATFORM(IOS)
  36 const double pagingTimeOut = 0.1; // Time in seconds to allow opportunistic timer to iterate over all blocks to see if the Heap is paged out.
  37 #endif
  38
  39 FullGCActivityCallback::FullGCActivityCallback(Heap* heap)
  40     : GCActivityCallback(heap)
  41 {
  42 }
  43
  44 void FullGCActivityCallback::doCollection()
  45 {
  46     Heap* heap = &m_vm->heap;
  47
  48 #if !PLATFORM(IOS)
  49     double startTime = WTF::monotonicallyIncreasingTime();
  50     if (heap->isPagedOut(startTime + pagingTimeOut)) {
  51         cancel();
  52         heap->increaseLastFullGCLength(pagingTimeOut);
  53         return;
  54     }
  55 #endif
  56
  57     heap->collect(FullCollection);
  58 }
  59
  60 double FullGCActivityCallback::lastGCLength()
  61 {
  62     return m_vm->heap.lastFullGCLength();
  63 }
  64
  65 double FullGCActivityCallback::deathRate()
  66 {
  67     Heap* heap = &m_vm->heap;
  68     size_t sizeBefore = heap->sizeBeforeLastFullCollection();
  69     size_t sizeAfter = heap->sizeAfterLastFullCollection();
  70     if (!sizeBefore)
  71         return 1.0;
  72     return static_cast<double>(sizeBefore - sizeAfter) / static_cast<double>(sizeBefore);
  73 }
  74
  75 double FullGCActivityCallback::gcTimeSlice(size_t bytes)
  76 {
  77     return std::min((static_cast<double>(bytes) / MB) * Options::percentCPUPerMBForFullTimer(), Options::collectionTimerMaxPercentCPU());
  78 }
  79
  80 #else
  81
  82 FullGCActivityCallback::FullGCActivityCallback(Heap* heap)
  83     : GCActivityCallback(heap)
  84 {
  85 }
  86
  87 void FullGCActivityCallback::doCollection()
  88 {
  89 }
  90
  91 double FullGCActivityCallback::lastGCLength()
  92 {
  93     return 0;
  94 }
  95
  96 double FullGCActivityCallback::deathRate()
  97 {
  98     return 0;
  99 }
 100
 101 double FullGCActivityCallback::gcTimeSlice(size_t)
 102 {
 103     return 0;
 104 }
 105
 106 #endif // USE(CF) || PLATFORM(EFL)
 107
 108 } // namespace JSC