7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "runtime/handles.inline.hpp"
28 #include "runtime/orderAccess.hpp"
29 #include "runtime/sharedRuntime.hpp"
30 #include "runtime/threadHeapSampler.hpp"
31
32 // Cheap random number generator.
33 uint64_t ThreadHeapSampler::_rnd;
34 // Default is 512kb.
35 volatile int ThreadHeapSampler::_sampling_interval = 512 * 1024;
36
37 // Ordering here is important: _log_table first, _log_table_initialized second.
38 double ThreadHeapSampler::_log_table[1 << ThreadHeapSampler::FastLogNumBits] = {};
39
40 // Force initialization of the log_table.
41 bool ThreadHeapSampler::_log_table_initialized = init_log_table();
42
43 bool ThreadHeapSampler::init_log_table() {
44 for (int i = 0; i < (1 << FastLogNumBits); i++) {
45 _log_table[i] = (log(1.0 + static_cast<double>(i+0.5) / (1 << FastLogNumBits))
46 / log(2.0));
47 }
48 return true;
|
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "runtime/atomic.hpp"
28 #include "runtime/handles.inline.hpp"
29 #include "runtime/sharedRuntime.hpp"
30 #include "runtime/threadHeapSampler.hpp"
31
32 // Cheap random number generator.
33 uint64_t ThreadHeapSampler::_rnd;
34 // Default is 512kb.
35 volatile int ThreadHeapSampler::_sampling_interval = 512 * 1024;
36
37 // Ordering here is important: _log_table first, _log_table_initialized second.
38 double ThreadHeapSampler::_log_table[1 << ThreadHeapSampler::FastLogNumBits] = {};
39
40 // Force initialization of the log_table.
41 bool ThreadHeapSampler::_log_table_initialized = init_log_table();
42
43 bool ThreadHeapSampler::init_log_table() {
44 for (int i = 0; i < (1 << FastLogNumBits); i++) {
45 _log_table[i] = (log(1.0 + static_cast<double>(i+0.5) / (1 << FastLogNumBits))
46 / log(2.0));
47 }
48 return true;
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