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  1. JDK
  2. JDK-6305280

Fastdebug GC spending most time in MutableSpace::mangle_unused_area

    Details

    • Subcomponent:
    • Introduced In Build:
      1.3.1
    • Introduced In Version:
    • CPU:
      sparc
    • OS:
      solaris_9

      Description

      Below is my original main about the problem.
      Coleen and I observed TIMEOUTs in Nightly testing on Solaris AMD64:
      nsk/serial/Unsafe/allocateMemory/allocmem001
      nsk/serial/Unsafe/allocateMemory/reallocmem001

      I am running full runThis on my SB2500.
      And it sits in the ThreadGC test for 5 hours already.
      I attached dbx and it shows that gc is in the
      MutableSpace::mangle_unused_area() method almost all time:

      Attached to process 2983 with 16 LWPs
      t@1 (l@1) stopped in ___lwp_cond_wait at 0xff31f9c8
      0xff31f9c8: ___lwp_cond_wait+0x0004: ta 8
      Current function is Monitor::wait (optimized)
        211 wait_status = _Lock_Event->wait();
      [t@1 l@1]: threads
       > t@1 a l@1 ?() running in ___lwp_cond_wait()
            t@2 b l@2 _start() running in ___lwp_cond_wait()
            t@3 b l@3 _start() running in ___lwp_cond_wait()
            t@4 b l@4 _start() running in mangle_unused_area()
            t@5 b l@5 _start() running in ___lwp_cond_wait()
            t@6 b l@6 _start() running in ___lwp_cond_wait()
            t@7 b l@7 _start() sleep on 0xfee68f00 in __lwp_park()
            t@8 b l@8 _start() running in ___lwp_cond_wait()
            t@9 b l@9 _start() running in ___lwp_cond_wait()
           t@10 b l@10 _start() running in ___lwp_cond_wait()
           t@11 b l@11 _start() running in ___lwp_mutex_lock()
           t@12 b l@12 _start() running in ___lwp_cond_wait()
           t@13 b l@13 _start() running in ___lwp_cond_wait()
           t@14 b l@14 _start() running in ___lwp_cond_wait()
        t@57527 b l@57527 _start() running in ___lwp_mutex_lock()
        t@57528 b l@57528 _start() running in ___lwp_mutex_lock()
      [t@1 l@1]: thread t@4
      t@4 (l@4) stopped in MutableSpace::mangle_unused_area (optimized) at line 139 in
       file "/export/home2/work/6297035/src/cpu/sparc/vm/copy_sparc.hpp"
        139 *to++ = value;
      [t@4 l@4]: where
      current thread: t@4
      =>[1] MutableSpace::mangle_unused_area(this = ???) (optimized), at 0xfdf899f0 (line ~139) in "/export/home2/work/6297035/src/cpu/sparc/vm/copy_sparc.hpp"
        [2] PSScavenge::invoke_no_policy(notify_ref_lock = ???) (optimized), at 0xfe09c868 (line ~317) in "/export/home2/work/6297035/src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp"
        [3] PSMarkSweep::invoke(notify_ref_lock = ???, maximum_heap_compaction = ???)(optimized), at 0xfe08bc50 (line ~48) in "/export/home2/work/6297035/src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp"
        [4] VM_ParallelGCSystemGC::doit(this = ???) (optimized), at 0xfe2d4f84 (line ~278) in "/export/home2/work/6297035/src/share/vm/gc_implementation/shared/vmGCOperations.cpp"
        [5] VM_Operation::evaluate(this = ???) (optimized), at 0xfe2f8694 (line ~25) in "/export/home2/work/6297035/src/share/vm/runtime/vm_operations.cpp"
        [6] VMThread::loop(this = ???) (optimized), at 0xfe2f7518 (line ~271) in "/export/home2/work/6297035/src/share/vm/runtime/vmThread.cpp"
        [7] VMThread::run(this = ???) (optimized), at 0xfe2f67f4 (line ~195) in "/export/home2/work/6297035/src/share/vm/runtime/vmThread.cpp"
        [8] _start(0x13b300, 0x2, 0xfee465ec, 0x21800, 0xfedb8ad4, 0x13bc90), at 0xfdfe6eec
      [t@4 l@4]: x 0xfdf899f0/3i
      0xfdf899f0: mangle_unused_area+0x0098: st %l5, [%l6]
      0xfdf899f4: mangle_unused_area+0x009c: inc 4, %l4
      0xfdf899f8: mangle_unused_area+0x00a0: inc -1, %l3
      [t@4 l@4]: print $l3
      $l3 = 15253648U
      [t@4 l@4]:

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              • Assignee:
                coleenp Coleen Phillimore
                Reporter:
                kvn Vladimir Kozlov
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