Re: opjitconv runs indefinitely

On 05/07/2015 12:08 PM, Andrew Haley wrote:
> On 05/07/2015 04:04 PM, Daniel Hansel wrote:
>> in that case these zero sized samples must not be invalidated without any further investigation.
>>
>> Could you describe such a case where zero-sized samples will be generated?
>> Maybe I could figure out how such samples could be used to produce a correct profiling report.
> 
> Surely Oprofile generates the samples.  I have no idea how samples
> could be generated against a zero-length region.  Zero-length
> regions are perfectly legitimate.
> 
> Andrew.

Hi Andrew,

I think the question was in reference to earlier email's:

  This is a particular PPC thing which generates zero-sized stubs in some cases.

There is a thread discussing this problem on the ppc-aix-port-dev mailing list:

http://mail.openjdk.java.net/pipermail/ppc-aix-port-dev/2014-July/002045.html

There seems to be some question whether jvmti should be generating that:

http://mail.openjdk.java.net/pipermail/ppc-aix-port-dev/2014-July/002048.html
https://bugs.openjdk.java.net/browse/JDK-8049441

It looks like there is a patch to remove the zero-length regions.

However, oprofile should be more graceful in how it handles this.

-Will

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