3187 } |
3187 } |
3188 |
3188 |
3189 return p_buf; |
3189 return p_buf; |
3190 |
3190 |
3191 } else { |
3191 } else { |
|
3192 if (TracePageSizes && Verbose) { |
|
3193 tty->print_cr("Reserving large pages in a single large chunk."); |
|
3194 } |
3192 // normal policy just allocate it all at once |
3195 // normal policy just allocate it all at once |
3193 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; |
3196 DWORD flag = MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES; |
3194 char * res = (char *)VirtualAlloc(NULL, bytes, flag, prot); |
3197 char * res = (char *)VirtualAlloc(addr, bytes, flag, prot); |
3195 if (res != NULL) { |
3198 if (res != NULL) { |
3196 address pc = CALLER_PC; |
3199 address pc = CALLER_PC; |
3197 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, mtNone, pc); |
3200 MemTracker::record_virtual_memory_reserve_and_commit((address)res, bytes, mtNone, pc); |
3198 } |
3201 } |
3199 |
3202 |
5712 } |
5715 } |
5713 |
5716 |
5714 #endif |
5717 #endif |
5715 |
5718 |
5716 #ifndef PRODUCT |
5719 #ifndef PRODUCT |
|
5720 |
|
5721 // test the code path in reserve_memory_special() that tries to allocate memory in a single |
|
5722 // contiguous memory block at a particular address. |
|
5723 // The test first tries to find a good approximate address to allocate at by using the same |
|
5724 // method to allocate some memory at any address. The test then tries to allocate memory in |
|
5725 // the vicinity (not directly after it to avoid possible by-chance use of that location) |
|
5726 // This is of course only some dodgy assumption, there is no guarantee that the vicinity of |
|
5727 // the previously allocated memory is available for allocation. The only actual failure |
|
5728 // that is reported is when the test tries to allocate at a particular location but gets a |
|
5729 // different valid one. A NULL return value at this point is not considered an error but may |
|
5730 // be legitimate. |
|
5731 // If -XX:+VerboseInternalVMTests is enabled, print some explanatory messages. |
5717 void TestReserveMemorySpecial_test() { |
5732 void TestReserveMemorySpecial_test() { |
5718 // No tests available for this platform |
5733 if (!UseLargePages) { |
5719 } |
5734 if (VerboseInternalVMTests) { |
5720 #endif |
5735 gclog_or_tty->print("Skipping test because large pages are disabled"); |
|
5736 } |
|
5737 return; |
|
5738 } |
|
5739 // save current value of globals |
|
5740 bool old_use_large_pages_individual_allocation = UseLargePagesIndividualAllocation; |
|
5741 bool old_use_numa_interleaving = UseNUMAInterleaving; |
|
5742 |
|
5743 // set globals to make sure we hit the correct code path |
|
5744 UseLargePagesIndividualAllocation = UseNUMAInterleaving = false; |
|
5745 |
|
5746 // do an allocation at an address selected by the OS to get a good one. |
|
5747 const size_t large_allocation_size = os::large_page_size() * 4; |
|
5748 char* result = os::reserve_memory_special(large_allocation_size, os::large_page_size(), NULL, false); |
|
5749 if (result == NULL) { |
|
5750 if (VerboseInternalVMTests) { |
|
5751 gclog_or_tty->print("Failed to allocate control block with size "SIZE_FORMAT". Skipping remainder of test.", |
|
5752 large_allocation_size); |
|
5753 } |
|
5754 } else { |
|
5755 os::release_memory_special(result, large_allocation_size); |
|
5756 |
|
5757 // allocate another page within the recently allocated memory area which seems to be a good location. At least |
|
5758 // we managed to get it once. |
|
5759 const size_t expected_allocation_size = os::large_page_size(); |
|
5760 char* expected_location = result + os::large_page_size(); |
|
5761 char* actual_location = os::reserve_memory_special(expected_allocation_size, os::large_page_size(), expected_location, false); |
|
5762 if (actual_location == NULL) { |
|
5763 if (VerboseInternalVMTests) { |
|
5764 gclog_or_tty->print("Failed to allocate any memory at "PTR_FORMAT" size "SIZE_FORMAT". Skipping remainder of test.", |
|
5765 expected_location, large_allocation_size); |
|
5766 } |
|
5767 } else { |
|
5768 // release memory |
|
5769 os::release_memory_special(actual_location, expected_allocation_size); |
|
5770 // only now check, after releasing any memory to avoid any leaks. |
|
5771 assert(actual_location == expected_location, |
|
5772 err_msg("Failed to allocate memory at requested location "PTR_FORMAT" of size "SIZE_FORMAT", is "PTR_FORMAT" instead", |
|
5773 expected_location, expected_allocation_size, actual_location)); |
|
5774 } |
|
5775 } |
|
5776 |
|
5777 // restore globals |
|
5778 UseLargePagesIndividualAllocation = old_use_large_pages_individual_allocation; |
|
5779 UseNUMAInterleaving = old_use_numa_interleaving; |
|
5780 } |
|
5781 #endif // PRODUCT |
|
5782 |