12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_GC_G1_G1IHOPCONTROL_HPP
26 #define SHARE_VM_GC_G1_G1IHOPCONTROL_HPP
27
28 #include "memory/allocation.hpp"
29 #include "utilities/numberSeq.hpp"
30
31 class G1Predictions;
32
33 // Manages the decision about the threshold when concurrent marking should start.
34 class G1IHOPControl : public CHeapObj<mtGC> {
35 protected:
36 double _ihop_percent;
37 size_t _target_occupancy;
38
39 // Initialize an instance with the initial IHOP value in percent and the target
40 // occupancy. The target occupancy is the number of bytes when marking should
41 // be finished and reclaim started.
42 G1IHOPControl(double initial_ihop_percent, size_t target_occupancy);
43 public:
44 virtual ~G1IHOPControl() { }
45
46 // Get the current marking threshold in bytes.
47 virtual size_t get_conc_mark_start_threshold() = 0;
48
49 // Update information about recent time during which allocations happened,
50 // how many allocations happened and an additional safety buffer.
51 virtual void update_allocation_info(double allocation_time_s, size_t allocated_bytes, size_t additional_buffer_size) = 0;
52 // Update the time from the end of initial mark to the first mixed gc.
53 virtual void update_time_to_mixed(double marking_length_s) = 0;
54
55 virtual void print() = 0;
56 };
57
58 class G1StaticIHOPControl : public G1IHOPControl {
59 double _last_allocation_time_s;
60 size_t _last_allocated_bytes;
61 double _last_marking_length_s;
62 public:
63 G1StaticIHOPControl(double ihop_percent, size_t target_occupancy);
64
65 size_t get_conc_mark_start_threshold() { return (size_t) (_ihop_percent * _target_occupancy / 100.0); }
66
67 virtual void update_allocation_info(double allocation_time_s, size_t allocated_bytes, size_t additional_buffer_size) {
68 assert(allocation_time_s >= 0.0, "Allocation time must be positive but is %.3f", allocation_time_s);
69 _last_allocation_time_s = allocation_time_s;
70 _last_allocated_bytes = allocated_bytes;
71 }
72
73 virtual void update_time_to_mixed(double marking_length_s) {
74 assert(marking_length_s > 0.0, "Marking length must be larger than zero but is %.3f", marking_length_s);
75 _last_marking_length_s = marking_length_s;
76 }
77
78 virtual void print();
79 #ifndef PRODUCT
80 static void test();
81 #endif
82 };
83
84 class G1AdaptiveIHOPControl : public G1IHOPControl {
85 G1Predictions const * _predictor;
86
87 TruncatedSeq _marking_times_s;
88 TruncatedSeq _allocation_rate_s;
89
90 size_t _last_allocation_bytes; // Most recent mutator allocation since last GC.
91 size_t _prev_unrestrained_young_size;
92
93 size_t _current_threshold;
94
95 // Updates _current_threshold according to internal state.
96 void recalculate();
97
98 bool have_enough_data_for_prediction() const;
99 public:
100 G1AdaptiveIHOPControl(double ihop_percent, size_t initial_target_occupancy, G1Predictions const* predictor);
101
102 virtual void set_target_occupancy(size_t target_occupancy);
103
104 virtual size_t get_conc_mark_start_threshold();
105
106 virtual void update_allocation_info(double allocation_time_s, size_t allocated_bytes, size_t additional_buffer_size);
107 virtual void update_time_to_mixed(double marking_length_s);
108
109 virtual void print();
110 #ifndef PRODUCT
111 static void test();
112 #endif
113 };
114
115 #endif // SHARE_VM_GC_G1_G1IHOPCONTROL_HPP
|
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_GC_G1_G1IHOPCONTROL_HPP
26 #define SHARE_VM_GC_G1_G1IHOPCONTROL_HPP
27
28 #include "memory/allocation.hpp"
29 #include "utilities/numberSeq.hpp"
30
31 class G1Predictions;
32 class G1NewTracer;
33
34 // Manages the decision about the threshold when concurrent marking should start.
35 class G1IHOPControl : public CHeapObj<mtGC> {
36 protected:
37 double _ihop_percent;
38 size_t _target_occupancy;
39
40 // Initialize an instance with the initial IHOP value in percent and the target
41 // occupancy. The target occupancy is the number of bytes when marking should
42 // be finished and reclaim started.
43 G1IHOPControl(double initial_ihop_percent, size_t target_occupancy);
44 public:
45 virtual ~G1IHOPControl() { }
46
47 // Get the current marking threshold in bytes.
48 virtual size_t get_conc_mark_start_threshold() = 0;
49
50 // Update information about recent time during which allocations happened,
51 // how many allocations happened and an additional safety buffer.
52 virtual void update_allocation_info(double allocation_time_s, size_t allocated_bytes, size_t additional_buffer_size) = 0;
53 // Update the time from the end of initial mark to the first mixed gc.
54 virtual void update_time_to_mixed(double marking_length_s) = 0;
55
56 virtual void print() = 0;
57 virtual void send_event(G1NewTracer* tracer) = 0;
58 };
59
60 class G1StaticIHOPControl : public G1IHOPControl {
61 double _last_allocation_time_s;
62 size_t _last_allocated_bytes;
63 double _last_marking_length_s;
64 public:
65 G1StaticIHOPControl(double ihop_percent, size_t target_occupancy);
66
67 size_t get_conc_mark_start_threshold() { return (size_t) (_ihop_percent * _target_occupancy / 100.0); }
68
69 virtual void update_allocation_info(double allocation_time_s, size_t allocated_bytes, size_t additional_buffer_size) {
70 assert(allocation_time_s >= 0.0, "Allocation time must be positive but is %.3f", allocation_time_s);
71 _last_allocation_time_s = allocation_time_s;
72 _last_allocated_bytes = allocated_bytes;
73 }
74
75 virtual void update_time_to_mixed(double marking_length_s) {
76 assert(marking_length_s > 0.0, "Marking length must be larger than zero but is %.3f", marking_length_s);
77 _last_marking_length_s = marking_length_s;
78 }
79
80 virtual void print();
81 virtual void send_event(G1NewTracer* tracer);
82 #ifndef PRODUCT
83 static void test();
84 #endif
85 };
86
87 class G1AdaptiveIHOPControl : public G1IHOPControl {
88 G1Predictions const * _predictor;
89
90 TruncatedSeq _marking_times_s;
91 TruncatedSeq _allocation_rate_s;
92
93 size_t _last_allocation_bytes; // Most recent mutator allocation since last GC.
94 size_t _prev_unrestrained_young_size;
95
96 size_t _current_threshold;
97
98 // Updates _current_threshold according to internal state.
99 void recalculate();
100
101 bool have_enough_data_for_prediction() const;
102 public:
103 G1AdaptiveIHOPControl(double ihop_percent, size_t initial_target_occupancy, G1Predictions const* predictor);
104
105 virtual void set_target_occupancy(size_t target_occupancy);
106
107 virtual size_t get_conc_mark_start_threshold();
108
109 virtual void update_allocation_info(double allocation_time_s, size_t allocated_bytes, size_t additional_buffer_size);
110 virtual void update_time_to_mixed(double marking_length_s);
111
112 virtual void print();
113 virtual void send_event(G1NewTracer* tracer);
114 #ifndef PRODUCT
115 static void test();
116 #endif
117 };
118
119 #endif // SHARE_VM_GC_G1_G1IHOPCONTROL_HPP
|