Issues with dtrace enabled in OpenJdk 9

David Holmes david.holmes at oracle.com
Tue May 12 09:16:21 UTC 2015 

On 12/05/2015 6:21 PM, Mahesh Pujari wrote:
> I think I have mixed up things, like thinking SDT and dtrace4linux as
> same, but there are not as pointed out by Staffan.
>
> So first I build jdk9 with not having SDT headers i.e. not having
> systemtap-dev. Build was success as expected.
>
> Next I did a build having SDT headers in path (i.e. I having installed
> systemtap and systemtap-dev), as pointed out by David, dtrace will be
> enabled by default, it seems its working as expected, i.e. dtrace was
> enabled but the build failed with below error.
>
> In file included from
> /mnt/ubuntu/dev/jdk9/hotspot/src/share/vm/utilities/dtrace.hpp:49:0,
>                   from
> /mnt/ubuntu/dev/jdk9/hotspot/src/share/vm/utilities/hashtable.inline.hpp:31,
>                   from
> /mnt/ubuntu/dev/jdk9/hotspot/src/share/vm/classfile/systemDictionary.hpp:35,
>                   from
> /mnt/ubuntu/dev/jdk9/hotspot/src/share/vm/ci/ciEnv.hpp:30,
>                   from
> /mnt/ubuntu/dev/jdk9/hotspot/src/share/vm/ci/ciUtilities.hpp:28,
>                   from
> /mnt/ubuntu/dev/jdk9/hotspot/src/share/vm/ci/ciNullObject.hpp:30,
>                   from
> /mnt/ubuntu/dev/jdk9/hotspot/src/share/vm/ci/ciConstant.hpp:29,
>                   from
> /mnt/ubuntu/dev/jdk9/hotspot/src/share/vm/ci/ciArray.hpp:29,
>                   from
> /mnt/ubuntu/dev/jdk9/hotspot/src/share/vm/precompiled/precompiled.hpp:33:
> ../generated/dtracefiles/hotspot.h:14:5: error: "_DTRACE_VERSION" is not
> defined [-Werror=undef]

What do the generated/dtracefiles contain? Does the log show them being 
created correctly?

David
-----

> To fix this, I re-configured with
> "--with-extra-cflags=-D_DTRACE_VERSION=true" and did "make all
> LOG=info", now compilation are success but linking failed (lot of them),
> few of the logs as below
>
> Compiling /mnt/ubuntu/dev/jdk9/hotspot/src/share/vm/runtime/vm_version.cpp
> Linking vm...
> classLoadingService.o: In function
> `ClassLoadingService::notify_class_unloaded(InstanceKlass*)':
> /mnt/ubuntu/dev/jdk9/hotspot/src/share/vm/services/classLoadingService.cpp:119:
> undefined reference to `__dtrace_hotspot___class__unloaded'
> classLoadingService.o: In function
> `ClassLoadingService::notify_class_loaded(InstanceKlass*, bool)':
> /mnt/ubuntu/dev/jdk9/hotspot/src/share/vm/services/classLoadingService.cpp:144:
> undefined reference to `__dtrace_hotspot___class__loaded'
> compileBroker.o: In function
> `CompileBroker::invoke_compiler_on_method(CompileTask*)':
> /mnt/ubuntu/dev/jdk9/hotspot/src/share/vm/compiler/compileBroker.cpp:1927:
> undefined reference to `__dtrace_hotspot___method__compile__begin'
>
>
> Do I need to install some other libraries, what am I missing here.
>
> thanks and regards,
> Mahesh Pujari
>
>
>
> On Monday, May 11, 2015 5:08 PM, Staffan Larsen
> <staffan.larsen at oracle.com> wrote:
>
>
> Note that SDT and dtrace4linux are different things. As far as I know,
> no one has tried dtrace4linux with Hotspot so you are in uncharted
> territories. SDT should work (if installed). Oracle Linux also has an
> implementation of Dtrace that I think is different from dtrace4linux.
> This is also untested.
>
> /Staffan
>
>
>
>  > On 11 maj 2015, at 13:21, David Holmes <david.holmes at oracle.com
> <mailto:david.holmes at oracle.com>> wrote:
>  >
>  > On 11/05/2015 8:51 PM, Mahesh Pujari wrote:
>  >> Thanks for replying back Erik.
>  >> I ran as you stated i.e. using "make DTRACE_ENABLED=true" but then I
> realized that the configure that I was running would do the same i.e. by
> having CFLAGS=-DDTRACE_ENABLED=1.
>  >
>  > No it isn't the same. The linux/makefiles/dtrace.make looks for
> DTRACE_ENABLED and will define additional targets if it is set, as well
> as setting -DDTRACE_ENABLED. If you just set the define then you miss
> other things.
>  >
>  > But that aside you don't set DTRACE_ENABLED either. dtrace will be
> enabled if the SDT header file is found. If you just do a build without
> trying to force dtrace on what does the log show?
>  >
>  > David
>  > -----
>  >
>  >> When I make (using your approach and passing enable in configure), I
> end up with lots and lots of "undefined reference to" errors during
> make, seems I am missing something, below are some error from build.logs.
>  >> classLoadingService.o: In function
> `ClassLoadingService::notify_class_unloaded(InstanceKlass*)':
>  >>
> /mnt/ubuntu/dev/jdk9/hotspot/src/share/vm/services/classLoadingService.cpp:119:
> undefined reference to `__dtrace_hotspot___class__unloaded'
>  >> classLoadingService.o: In function
> `ClassLoadingService::notify_class_loaded(InstanceKlass*, bool)':
>  >>
> /mnt/ubuntu/dev/jdk9/hotspot/src/share/vm/services/classLoadingService.cpp:144:
> undefined reference to `__dtrace_hotspot___class__loaded'
>  >> compileBroker.o: In function
> `CompileBroker::invoke_compiler_on_method(CompileTask*)':
>  >>
> /mnt/ubuntu/dev/jdk9/hotspot/src/share/vm/compiler/compileBroker.cpp:1927:
> undefined reference to `__dtrace_hotspot___method__compile__begin'
>  >>
> /mnt/ubuntu/dev/jdk9/hotspot/src/share/vm/compiler/compileBroker.cpp:2028:
> undefined reference to `__dtrace_hotspot___method__compile__end'
>  >>
>  >> thanks and regards,Mahesh Pujari
>  >>
>  >>
>  >>
>  >>      On Monday, May 11, 2015 3:53 PM, Erik Joelsson
> <erik.joelsson at oracle.com <mailto:erik.joelsson at oracle.com>> wrote:
>  >>
>  >>
>  >>  Hello,
>  >>
>  >> I don't have any experience building with dtrace support, but the
>  >> Hotspot makefiles seem to imply that it can be achieved by running:
>  >>
>  >> make DTRACE_ENABLED=true
>  >>
>  >> That variable will trigger the appropriate preprocessor flags to be
>  >> added at least. See hotspot/make/linux/makefiles/dtrace.make.
>  >>
>  >> The jdk libraries do not support dtrace AFAIK.
>  >>
>  >> /Erik
>  >>
>  >> On 2015-05-11 11:47, Mahesh Pujari wrote:
>  >>> Hi all,
>  >>> I am trying make OpenJdk 9 with dtrace enabled, on my Ubuntu
> machine (installed with https://github.com/dtrace4linux/linux), with
> configuration as below (and I am noob).
>  >>> ./configure --enable-option-checking=fatal
> --with-debug-level=slowdebug --with-target-bits=64
> --disable-zip-debug-info --with-boot-jdk=/mnt/ubuntu/setup/jdk1.8.0
> CFLAGS=-DDTRACE_ENABLED=1 --with-extra-cflags=-D_DTRACE_VERSION=1
>  >>>
>  >>> Below is my system info (using uname -a)Linux PHP0045
> 3.13.0-45-generic #74-Ubuntu SMP Tue Jan 13 19:36:28 UTC 2015 x86_64
> x86_64 x86_64 GNU/Linux
>  >>>
>  >>> When I do "make all", I end up in error as below...
>  >>> ...
>  >>> vmThread.o: In function `VMOperationQueue::add(VM_Operation*)':
>  >>> /mnt/ubuntu/dev/jdk9/hotspot/src/share/vm/runtime/vmThread.cpp:156:
> undefined reference to `__dtrace_hotspot___vmops__request'
>  >>> vmThread.o: In function `VMThread::evaluate_operation(VM_Operation*)':
>  >>> /mnt/ubuntu/dev/jdk9/hotspot/src/share/vm/runtime/vmThread.cpp:354:
> undefined reference to `__dtrace_hotspot___vmops__begin'
>  >>> /mnt/ubuntu/dev/jdk9/hotspot/src/share/vm/runtime/vmThread.cpp:374:
> undefined reference to `__dtrace_hotspot___vmops__end'......
>  >>>
>  >>> Can some one direct me about what I might be missing. Can we
> actually build dtrace with enabled on Ubuntu, if not what other way I
> can do tracing (may be using systemtap, any pointers please). Am I on
> right track? (please direct).
>  >>>
>  >>>
>  >>> thanks and regards,Mahesh Pujari
>  >>
>  >>
>  >>
>  >>
>  >>
>
>

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