9 * This code is distributed in the hope that it will be useful, but WITHOUT
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 #include "precompiled.hpp"
26 #include "logging/log.hpp"
27 #include "runtime/globals.hpp"
28 #include "runtime/os.hpp"
29 #include "runtime/safepointMechanism.hpp"
30 #include "utilities/globalDefinitions.hpp"
31
32 void SafepointMechanism::default_initialize() {
33 const size_t page_size = os::vm_page_size();
34 char* polling_page = os::reserve_memory(page_size, NULL, page_size);
35 os::commit_memory_or_exit(polling_page, page_size, false, "Unable to commit Safepoint polling page");
36 bool res = os::protect_memory(polling_page, page_size, os::MEM_PROT_READ);
37
38 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page));
39 os::set_polling_page((address)(polling_page));
40 }
41
42 void SafepointMechanism::initialize_serialize_page() {
43 if (!UseMembar) {
44 const size_t page_size = os::vm_page_size();
45 char* serialize_page = os::reserve_memory(page_size, NULL, page_size);
46 os::commit_memory_or_exit(serialize_page, page_size, false, "Unable to commit memory serialization page");
47 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(serialize_page));
48 os::set_memory_serialize_page((address)(serialize_page));
49 }
50 }
51
52 void SafepointMechanism::initialize() {
53 pd_initialize();
54 initialize_serialize_page();
55 }
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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 #include "precompiled.hpp"
26 #include "logging/log.hpp"
27 #include "runtime/globals.hpp"
28 #include "runtime/os.hpp"
29 #include "runtime/safepointMechanism.inline.hpp"
30 #include "utilities/globalDefinitions.hpp"
31
32 SafepointMechanism::PollingType SafepointMechanism::_polling_type = SafepointMechanism::_global_page_poll;
33 void* SafepointMechanism::_poll_armed_value;
34 void* SafepointMechanism::_poll_disarmed_value;
35
36 void SafepointMechanism::default_initialize() {
37 if (ThreadLocalHandshakes) {
38 set_uses_thread_local_poll();
39 const size_t page_size = os::vm_page_size();
40 const size_t allocation_size = 2 * page_size;
41 char* polling_page = os::reserve_memory(allocation_size, NULL, page_size);
42 os::commit_memory_or_exit(polling_page, allocation_size, false, "Unable to commit Safepoint polling page");
43
44 char* bad_page = polling_page;
45 char* good_page = polling_page + page_size;
46
47 os::protect_memory(bad_page, page_size, os::MEM_PROT_NONE);
48 os::protect_memory(good_page, page_size, os::MEM_PROT_READ);
49
50 log_info(os)("SafePoint Polling address, bad (protected) page:" INTPTR_FORMAT ", good (unprotected) page:" INTPTR_FORMAT, p2i(bad_page), p2i(good_page));
51 os::set_polling_page((address)(bad_page));
52
53 intptr_t poll_page_val = reinterpret_cast<intptr_t>(bad_page);
54 _poll_armed_value = reinterpret_cast<void*>(poll_page_val | poll_bit());
55 _poll_disarmed_value = good_page;
56 } else {
57 const size_t page_size = os::vm_page_size();
58 char* polling_page = os::reserve_memory(page_size, NULL, page_size);
59 os::commit_memory_or_exit(polling_page, page_size, false, "Unable to commit Safepoint polling page");
60 os::protect_memory(polling_page, page_size, os::MEM_PROT_READ);
61
62 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page));
63 os::set_polling_page((address)(polling_page));
64 }
65 }
66
67 void SafepointMechanism::initialize_header(JavaThread* thread) {
68 disarm_local_poll(thread);
69 }
70
71 void SafepointMechanism::initialize_serialize_page() {
72 if (!UseMembar) {
73 const size_t page_size = os::vm_page_size();
74 char* serialize_page = os::reserve_memory(page_size, NULL, page_size);
75 os::commit_memory_or_exit(serialize_page, page_size, false, "Unable to commit memory serialization page");
76 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(serialize_page));
77 os::set_memory_serialize_page((address)(serialize_page));
78 }
79 }
80
81 void SafepointMechanism::initialize() {
82 pd_initialize();
83 initialize_serialize_page();
84 }
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