JDK-8337217 : Port VirtualMemoryTracker to use VMATree
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: runtime
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2024-07-25
  • Updated: 2025-08-15
  • Resolved: 2025-06-18
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JDK 26
26 b03Fixed
Related Reports
Causes :  
JDK-8359959 - Test runtime/NMT/VirtualAllocTestType.java failed: '\\[0x[0]*7f7dc4043000 - 0x[0]*7f7dc4083000\\] reserved 256KB for Test' missing from stdout/stderr
Causes :  
JDK-8360048 - NMT crash in gtest/NMTGtests.java: fatal error: NMT corruption: Block at 0x0000017748307120: header canary broken
Duplicate :  
JDK-8308501 - Replacement of SortedLinkList in NMT with other more efficient data structures
Duplicate :  
JDK-8349971 - NMT should allow to repaint memory with different tags
Duplicate :  
JDK-8349968 - NMT should never use tty for error logging
Relates :  
JDK-8335756 - NMT: VMATree should provide iterators for reserved regions
Description
With JDK-8308501, a tree data structure has been merged which enables tracking of memory regions. This tree can be used in the VirtualMemoryTracker class of NMT to replace the exisiting SortedLinkList implementation, which in turn speeds up the virtual memory tracking.
Comments
[~mbaesken] that looks like it may be JDK-8360048
21-07-2025
We recently saw a crash on Windows x86_64 ; could it be related to this change ? gtest/NMTGtests.java#nmt-detail # EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x00007ff9d9101866, pid=44112, tid=34596 # # JRE version: OpenJDK Runtime Environment (26.0) (build 26-internal-adhoc.sapmachine.jdk) # Java VM: OpenJDK 64-Bit Server VM (26-internal-adhoc.sapmachine.jdk, mixed mode, tiered, compressed oops, compact obj headers, g1 gc, windows-amd64) # Problematic frame: # V [jvm.dll+0xdb1866] VMATree::register_mapping+0x126 Stack: [0x000000850dc00000,0x000000850dd00000], sp=0x000000850dcfe0c0, free space=1016k Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code) V [jvm.dll+0xdb1866] VMATree::register_mapping+0x126 (vmatree.cpp:264) V [jvm.dll+0xd9930a] VirtualMemoryTracker::add_reserved_region+0x7a (virtualMemoryTracker.cpp:74) V [jvm.dll+0xd9927e] VirtualMemoryTracker::Instance::add_reserved_region+0x1e (virtualMemoryTracker.cpp:69) V [jvm.dll+0xb3da63] os::reserve_memory+0x93 (os.cpp:1975) V [jvm.dll+0x24e6d7] NMT_location_printing_mmap_1_vm_Test::TestBody+0x17 (test_nmt_locationprinting.cpp:126) V [jvm.dll+0xe1f30f] testing::internal::HandleExceptionsInMethodIfSupported<testing::TestSuite,void>+0x4f (gtest.cc:2670) V [jvm.dll+0xe4aa7d] testing::TestInfo::Run+0x1bd (gtest.cc:2836) V [jvm.dll+0xe4ae66] testing::TestSuite::Run+0x2c6 (gtest.cc:3017) V [jvm.dll+0xe4b85a] testing::internal::UnitTestImpl::RunAllTests+0x5ba (gtest.cc:5921) V [jvm.dll+0xe1f3f3] testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl,bool>+0x53 (gtest.cc:2670) V [jvm.dll+0xe4b15d] testing::UnitTest::Run+0x13d (gtest.cc:5484) V [jvm.dll+0xabb87] runUnitTestsInner+0x2d7 (gtestMain.cpp:292) V [jvm.dll+0xabe1f] runUnitTests+0xff (gtestMain.cpp:373) C [gtestLauncher.exe+0x101c] main+0x1c (gtestLauncher.cpp:40) C [gtestLauncher.exe+0x121c] __scrt_common_main_seh+0x10c (exe_common.inl:288) C [KERNEL32.DLL+0x17ac4] (no source info available) C [ntdll.dll+0x5a8c1] (no source info available) siginfo: EXCEPTION_ACCESS_VIOLATION (0xc0000005), reading address 0x0000790f00007383
21-07-2025
Changeset: 547ce030 Branch: master Author: Afshin Zafari <azafari@openjdk.org> Date: 2025-06-18 11:37:48 +0000 URL: https://git.openjdk.org/jdk/commit/547ce0301684fdebe95ce2e8e195a019bcefe493
18-06-2025
A pull request was submitted for review. Branch: master URL: https://git.openjdk.org/jdk/pull/20425 Date: 2024-08-01 15:44:32 +0000
08-11-2024