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");
|
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
40 // Poll bit values
41 intptr_t poll_armed_value = poll_bit();
42 intptr_t poll_disarmed_value = 0;
43
44 #ifdef USE_POLL_BIT_ONLY
45 if (!USE_POLL_BIT_ONLY)
46 #endif
47 {
48 // Polling page
49 const size_t page_size = os::vm_page_size();
50 const size_t allocation_size = 2 * page_size;
51 char* polling_page = os::reserve_memory(allocation_size, NULL, page_size);
52 os::commit_memory_or_exit(polling_page, allocation_size, false, "Unable to commit Safepoint polling page");
53
54 char* bad_page = polling_page;
55 char* good_page = polling_page + page_size;
56
57 os::protect_memory(bad_page, page_size, os::MEM_PROT_NONE);
58 os::protect_memory(good_page, page_size, os::MEM_PROT_READ);
59
60 log_info(os)("SafePoint Polling address, bad (protected) page:" INTPTR_FORMAT ", good (unprotected) page:" INTPTR_FORMAT, p2i(bad_page), p2i(good_page));
61 os::set_polling_page((address)(bad_page));
62
63 // Poll address values
64 intptr_t bad_page_val = reinterpret_cast<intptr_t>(bad_page),
65 good_page_val = reinterpret_cast<intptr_t>(good_page);
66 poll_armed_value |= bad_page_val;
67 poll_disarmed_value |= good_page_val;
68 }
69
70 _poll_armed_value = reinterpret_cast<void*>(poll_armed_value);
71 _poll_disarmed_value = reinterpret_cast<void*>(poll_disarmed_value);
72 } else {
73 const size_t page_size = os::vm_page_size();
74 char* polling_page = os::reserve_memory(page_size, NULL, page_size);
75 os::commit_memory_or_exit(polling_page, page_size, false, "Unable to commit Safepoint polling page");
76 os::protect_memory(polling_page, page_size, os::MEM_PROT_READ);
77
78 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page));
79 os::set_polling_page((address)(polling_page));
80 }
81 }
82
83 void SafepointMechanism::initialize_header(JavaThread* thread) {
84 disarm_local_poll(thread);
85 }
86
87 void SafepointMechanism::initialize_serialize_page() {
88 if (!UseMembar) {
89 const size_t page_size = os::vm_page_size();
90 char* serialize_page = os::reserve_memory(page_size, NULL, page_size);
91 os::commit_memory_or_exit(serialize_page, page_size, false, "Unable to commit memory serialization page");
|