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/*
Title: heapsizing.h - parameters to adjust heap size
Copyright (c) Copyright David C.J. Matthews 2012
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef HEAPSIZING_H_INCLUDED
#define HEAPSIZING_H_INCLUDED 1
#include "timing.h"
class LocalMemSpace;
class HeapSizeParameters {
public:
HeapSizeParameters();
// Extract timing information for ML.
Handle getGCUtime(TaskData *taskData) const;
Handle getGCStime(TaskData *taskData) const;
void SetHeapParameters(POLYUNSIGNED minsize, POLYUNSIGNED maxsize, POLYUNSIGNED initialsize, unsigned percent);
void SetReservation(POLYUNSIGNED rsize);
// Called in the minor GC if a GC thread needs to grow the heap.
// Returns zero if the heap cannot be grown.
LocalMemSpace *AddSpaceInMinorGC(POLYUNSIGNED space, bool isMutable);
// Called in the major GC before the copy phase if the heap is more than
// 90% full. This should improve the efficiency of copying.
LocalMemSpace *AddSpaceBeforeCopyPhase(bool isMutable);
bool PerformSharingPass() const { return performSharingPass; }
void AdjustSizeAfterMajorGC(POLYUNSIGNED wordsRequired);
bool AdjustSizeAfterMinorGC(POLYUNSIGNED spaceAfterGC, POLYUNSIGNED spaceBeforeGC);
// Returns true if we should run a major GC at this point
bool RunMajorGCImmediately();
/* Called by the garbage collector at the beginning and
end of garbage collection. */
typedef enum __gcTime {
GCTimeStart,
GCTimeIntermediate,
GCTimeEnd
} gcTime;
// These are called by the GC to record information about its progress.
void RecordAtStartOfMajorGC();
void RecordGCTime(gcTime isEnd, const char *stage = "");
void RecordSharingData(POLYUNSIGNED recovery);
void resetMinorTimingData(void);
void resetMajorTimingData(void);
void Init(void);
void Final(void);
private:
// Estimate the GC cost for a given heap size. The result is the ratio of
// GC time to application time.
double costFunction(POLYUNSIGNED heapSize, bool withSharing, bool withSharingCost);
bool getCostAndSize(POLYUNSIGNED &heapSize, double &cost, bool withSharing);
// Set if we should do a full GC next time instead of a minor GC.
bool fullGCNextTime;
// Whether a sharing pass should be performed on the next GC
bool performSharingPass;
// The proportion of the total heap recovered by the sharing pass
double sharingRecoveryRate;
// The cost of doing the sharing as a proportion of the rest of the GC.
double sharingCostFactor;
// The actual number of words recovered in the last sharing pass
POLYUNSIGNED sharingWordsRecovered;
// The saving we would have made by enabling sharing in the past
double cumulativeSharingSaving;
// Maximum and minimum heap size as given by the user.
POLYUNSIGNED minHeapSize, maxHeapSize;
// Target GC cost requested by the user.
double userGCRatio;
// Actual ratio for the last major GC
double lastMajorGCRatio;
// Predicted ratio for the next GC
double predictedRatio;
POLYUNSIGNED lastFreeSpace, currentSpaceUsed;
// Set to false if an allocation failed. Indicates that
// we may have reached some virtual memory limit.
bool lastAllocationSucceeded;
// Set to true if the last major GC may have hit the limit
bool allocationFailedBeforeLastMajorGC;
// The estimated boundary where the paging will become
// a significant factor.
POLYUNSIGNED pagingLimitSize;
// The maximum size the heap has reached so far.
POLYUNSIGNED highWaterMark;
// The heap size at the start of the current GC before any spaces have been deleted.
POLYUNSIGNED heapSizeAtStart;
// The start of the clock.
TIMEDATA startTime;
// Timing for the last minor or major GC
TIMEDATA minorNonGCUserCPU;
TIMEDATA minorNonGCSystemCPU;
TIMEDATA minorNonGCReal;
TIMEDATA minorGCUserCPU;
TIMEDATA minorGCSystemCPU;
TIMEDATA minorGCReal;
long minorGCPageFaults;
unsigned minorGCsSinceMajor;
// Timing for all the minor GCs and the last major GC.
// Reset after each major GC.
TIMEDATA majorNonGCUserCPU;
TIMEDATA majorNonGCSystemCPU;
TIMEDATA majorNonGCReal;
TIMEDATA majorGCUserCPU;
TIMEDATA majorGCSystemCPU;
TIMEDATA majorGCReal;
long majorGCPageFaults;
// Totals for all GCs
TIMEDATA totalGCUserCPU;
TIMEDATA totalGCSystemCPU;
TIMEDATA totalGCReal;
// The cost for the last sharing pass
TIMEDATA sharingCPU;
TIMEDATA startUsageU, startUsageS, lastUsageU, lastUsageS;
TIMEDATA startRTime, lastRTime;
long startPF;
};
extern HeapSizeParameters gHeapSizeParameters;
#endif
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