5540 strncat(agent_entry_name, lib_name, name_len);
5541 }
5542 } else {
5543 strcpy(agent_entry_name, sym_name);
5544 }
5545 return agent_entry_name;
5546 }
5547
5548 #ifndef PRODUCT
5549
5550 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5551 // contiguous memory block at a particular address.
5552 // The test first tries to find a good approximate address to allocate at by using the same
5553 // method to allocate some memory at any address. The test then tries to allocate memory in
5554 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5555 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5556 // the previously allocated memory is available for allocation. The only actual failure
5557 // that is reported is when the test tries to allocate at a particular location but gets a
5558 // different valid one. A NULL return value at this point is not considered an error but may
5559 // be legitimate.
5560 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages.
5561 void TestReserveMemorySpecial_test() {
5562 if (!UseLargePages) {
5563 if (VerboseInternalVMTests) {
5564 tty->print("Skipping test because large pages are disabled");
5565 }
5566 return;
5567 }
5568 // save current value of globals
5569 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5570 bool old_use_numa_interleaving = UseNUMAInterleaving;
5571
5572 // set globals to make sure we hit the correct code path
5573 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5574
5575 // do an allocation at an address selected by the OS to get a good one.
5576 const size_t large_allocation_size = os::large_page_size() * 4;
5577 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5578 if (result == NULL) {
5579 if (VerboseInternalVMTests) {
5580 tty->print("Failed to allocate control block with size " SIZE_FORMAT ". Skipping remainder of test.",
5581 large_allocation_size);
5582 }
5583 } else {
5584 os::release_memory_special(result, large_allocation_size);
5585
5586 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5587 // we managed to get it once.
5588 const size_t expected_allocation_size = os::large_page_size();
5589 char* expected_location = result + os::large_page_size();
5590 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5591 if (actual_location == NULL) {
5592 if (VerboseInternalVMTests) {
5593 tty->print("Failed to allocate any memory at " PTR_FORMAT " size " SIZE_FORMAT ". Skipping remainder of test.",
5594 expected_location, large_allocation_size);
5595 }
5596 } else {
5597 // release memory
5598 os::release_memory_special(actual_location, expected_allocation_size);
5599 // only now check, after releasing any memory to avoid any leaks.
5600 assert(actual_location == expected_location,
5601 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5602 expected_location, expected_allocation_size, actual_location);
5603 }
5604 }
5605
5606 // restore globals
5607 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5608 UseNUMAInterleaving = old_use_numa_interleaving;
5609 }
5610 #endif // PRODUCT
5611
5612 /*
5613 All the defined signal names for Windows.
5614
5615 NOTE that not all of these names are accepted by FindSignal!
|
5540 strncat(agent_entry_name, lib_name, name_len);
5541 }
5542 } else {
5543 strcpy(agent_entry_name, sym_name);
5544 }
5545 return agent_entry_name;
5546 }
5547
5548 #ifndef PRODUCT
5549
5550 // test the code path in reserve_memory_special() that tries to allocate memory in a single
5551 // contiguous memory block at a particular address.
5552 // The test first tries to find a good approximate address to allocate at by using the same
5553 // method to allocate some memory at any address. The test then tries to allocate memory in
5554 // the vicinity (not directly after it to avoid possible by-chance use of that location)
5555 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of
5556 // the previously allocated memory is available for allocation. The only actual failure
5557 // that is reported is when the test tries to allocate at a particular location but gets a
5558 // different valid one. A NULL return value at this point is not considered an error but may
5559 // be legitimate.
5560 void TestReserveMemorySpecial_test() {
5561 if (!UseLargePages) {
5562 return;
5563 }
5564 // save current value of globals
5565 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation;
5566 bool old_use_numa_interleaving = UseNUMAInterleaving;
5567
5568 // set globals to make sure we hit the correct code path
5569 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false;
5570
5571 // do an allocation at an address selected by the OS to get a good one.
5572 const size_t large_allocation_size = os::large_page_size() * 4;
5573 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false);
5574 if (result == NULL) {
5575 } else {
5576 os::release_memory_special(result, large_allocation_size);
5577
5578 // allocate another page within the recently allocated memory area which seems to be a good location. At least
5579 // we managed to get it once.
5580 const size_t expected_allocation_size = os::large_page_size();
5581 char* expected_location = result + os::large_page_size();
5582 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false);
5583 if (actual_location == NULL) {
5584 } else {
5585 // release memory
5586 os::release_memory_special(actual_location, expected_allocation_size);
5587 // only now check, after releasing any memory to avoid any leaks.
5588 assert(actual_location == expected_location,
5589 "Failed to allocate memory at requested location " PTR_FORMAT " of size " SIZE_FORMAT ", is " PTR_FORMAT " instead",
5590 expected_location, expected_allocation_size, actual_location);
5591 }
5592 }
5593
5594 // restore globals
5595 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation;
5596 UseNUMAInterleaving = old_use_numa_interleaving;
5597 }
5598 #endif // PRODUCT
5599
5600 /*
5601 All the defined signal names for Windows.
5602
5603 NOTE that not all of these names are accepted by FindSignal!
|