10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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_CMS_ALLOCATIONSTATS_HPP
26 #define SHARE_VM_GC_CMS_ALLOCATIONSTATS_HPP
27
28 #include "gc/shared/gcUtil.hpp"
29 #include "logging/log.hpp"
30 #include "memory/allocation.hpp"
31 #include "utilities/globalDefinitions.hpp"
32 #include "utilities/macros.hpp"
33
34 class AllocationStats VALUE_OBJ_CLASS_SPEC {
35 // A duration threshold (in ms) used to filter
36 // possibly unreliable samples.
37 static float _threshold;
38
39 // We measure the demand between the end of the previous sweep and
40 // beginning of this sweep:
41 // Count(end_last_sweep) - Count(start_this_sweep)
42 // + split_births(between) - split_deaths(between)
43 // The above number divided by the time since the end of the
44 // previous sweep gives us a time rate of demand for blocks
45 // of this size. We compute a padded average of this rate as
46 // our current estimate for the time rate of demand for blocks
47 // of this size. Similarly, we keep a padded average for the time
48 // between sweeps. Our current estimate for demand for blocks of
49 // this size is then simply computed as the product of these two
50 // estimates.
51 AdaptivePaddedAverage _demand_rate_estimate;
52
53 ssize_t _desired; // Demand estimate computed as described above
54 ssize_t _coal_desired; // desired +/- small-percent for tuning coalescing
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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_CMS_ALLOCATIONSTATS_HPP
26 #define SHARE_VM_GC_CMS_ALLOCATIONSTATS_HPP
27
28 #include "gc/shared/gcUtil.hpp"
29 #include "logging/log.hpp"
30 #include "utilities/globalDefinitions.hpp"
31 #include "utilities/macros.hpp"
32
33 class AllocationStats {
34 // A duration threshold (in ms) used to filter
35 // possibly unreliable samples.
36 static float _threshold;
37
38 // We measure the demand between the end of the previous sweep and
39 // beginning of this sweep:
40 // Count(end_last_sweep) - Count(start_this_sweep)
41 // + split_births(between) - split_deaths(between)
42 // The above number divided by the time since the end of the
43 // previous sweep gives us a time rate of demand for blocks
44 // of this size. We compute a padded average of this rate as
45 // our current estimate for the time rate of demand for blocks
46 // of this size. Similarly, we keep a padded average for the time
47 // between sweeps. Our current estimate for demand for blocks of
48 // this size is then simply computed as the product of these two
49 // estimates.
50 AdaptivePaddedAverage _demand_rate_estimate;
51
52 ssize_t _desired; // Demand estimate computed as described above
53 ssize_t _coal_desired; // desired +/- small-percent for tuning coalescing
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