8006fe8f75
Replaced MakeDeps and the includeDB files with more standardized solutions. Reviewed-by: coleenp, kvn, kamg
138 lines
4.6 KiB
C++
138 lines
4.6 KiB
C++
/*
|
|
* Copyright (c) 2001, 2010, 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_G1_G1MMUTRACKER_HPP
|
|
#define SHARE_VM_GC_IMPLEMENTATION_G1_G1MMUTRACKER_HPP
|
|
|
|
#include "memory/allocation.hpp"
|
|
#include "utilities/debug.hpp"
|
|
|
|
// Keeps track of the GC work and decides when it is OK to do GC work
|
|
// and for how long so that the MMU invariants are maintained.
|
|
|
|
/***** ALL TIMES ARE IN SECS!!!!!!! *****/
|
|
|
|
// this is the "interface"
|
|
class G1MMUTracker: public CHeapObj {
|
|
protected:
|
|
double _time_slice;
|
|
double _max_gc_time; // this is per time slice
|
|
|
|
public:
|
|
G1MMUTracker(double time_slice, double max_gc_time);
|
|
|
|
virtual void add_pause(double start, double end, bool gc_thread) = 0;
|
|
virtual double longest_pause(double current_time) = 0;
|
|
virtual double when_sec(double current_time, double pause_time) = 0;
|
|
|
|
double max_gc_time() {
|
|
return _max_gc_time;
|
|
}
|
|
|
|
inline bool now_max_gc(double current_time) {
|
|
return when_sec(current_time, max_gc_time()) < 0.00001;
|
|
}
|
|
|
|
inline double when_max_gc_sec(double current_time) {
|
|
return when_sec(current_time, max_gc_time());
|
|
}
|
|
|
|
inline jlong when_max_gc_ms(double current_time) {
|
|
double when = when_max_gc_sec(current_time);
|
|
return (jlong) (when * 1000.0);
|
|
}
|
|
|
|
inline jlong when_ms(double current_time, double pause_time) {
|
|
double when = when_sec(current_time, pause_time);
|
|
return (jlong) (when * 1000.0);
|
|
}
|
|
};
|
|
|
|
class G1MMUTrackerQueueElem VALUE_OBJ_CLASS_SPEC {
|
|
private:
|
|
double _start_time;
|
|
double _end_time;
|
|
|
|
public:
|
|
inline double start_time() { return _start_time; }
|
|
inline double end_time() { return _end_time; }
|
|
inline double duration() { return _end_time - _start_time; }
|
|
|
|
G1MMUTrackerQueueElem() {
|
|
_start_time = 0.0;
|
|
_end_time = 0.0;
|
|
}
|
|
|
|
G1MMUTrackerQueueElem(double start_time, double end_time) {
|
|
_start_time = start_time;
|
|
_end_time = end_time;
|
|
}
|
|
};
|
|
|
|
// this is an implementation of the MMUTracker using a (fixed-size) queue
|
|
// that keeps track of all the recent pause times
|
|
class G1MMUTrackerQueue: public G1MMUTracker {
|
|
private:
|
|
enum PrivateConstants {
|
|
QueueLength = 64
|
|
};
|
|
|
|
// The array keeps track of all the pauses that fall within a time
|
|
// slice (the last time slice during which pauses took place).
|
|
// The data structure implemented is a circular queue.
|
|
// Head "points" to the most recent addition, tail to the oldest one.
|
|
// The array is of fixed size and I don't think we'll need more than
|
|
// two or three entries with the current behaviour of G1 pauses.
|
|
// If the array is full, an easy fix is to look for the pauses with
|
|
// the shortest gap between them and consolidate them.
|
|
// For now, we have taken the expedient alternative of forgetting
|
|
// the oldest entry in the event that +G1UseFixedWindowMMUTracker, thus
|
|
// potentially violating MMU specs for some time thereafter.
|
|
|
|
G1MMUTrackerQueueElem _array[QueueLength];
|
|
int _head_index;
|
|
int _tail_index;
|
|
int _no_entries;
|
|
|
|
inline int trim_index(int index) {
|
|
return (index + QueueLength) % QueueLength;
|
|
}
|
|
|
|
void remove_expired_entries(double current_time);
|
|
double calculate_gc_time(double current_time);
|
|
|
|
double longest_pause_internal(double current_time);
|
|
double when_internal(double current_time, double pause_time);
|
|
|
|
public:
|
|
G1MMUTrackerQueue(double time_slice, double max_gc_time);
|
|
|
|
virtual void add_pause(double start, double end, bool gc_thread);
|
|
|
|
virtual double longest_pause(double current_time);
|
|
virtual double when_sec(double current_time, double pause_time);
|
|
};
|
|
|
|
#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1MMUTRACKER_HPP
|